How to use dry welding

Dry welding how to use - Metals, equipment, instructions

Cold welding is a method that allows you to solve many everyday (and not only) problems. It is used for connections by both car enthusiasts, for repairing their cars, and plumbing, because it copes well with pipe repairs.

In the conventional welding process, high temperatures are required to join materials. In the case we are considering today, there will be no such need. But this does not prevent us from fastening together even a wide variety of materials, such as glass, wood, metal or ceramics. We will talk about what types there are, features and how to use cold welding accurately.

Features and types of cold welding

There are only two types of this welding:

• spot . It is popular in aluminum and copper connections. To weld materials, they are compressed with a punch. During operation, parts may be subject to change. The formation of welding points is possible, but the overall integrity of the shapes of the elements does not disappear.
• roller _ The peculiarity of this welding is to obtain a continuous monolithic connection. If rectangular or square pointe shoes are used, welding will have similar features to the spot method.

In turn, the roller method of connecting parts is divided into three subtypes:

1. Double-sided. In this case, take two identical rollers;
2. Asymmetric. Using two different rollers;
3. Unilateral. One ball is taken, it is able to provide the required pressure, with the help of which a connection of materials will occur.

What is the cold welding material made of?

Recommendations

Welding has two components. In tandem they form an ultra-high performance adhesive. Epoxy resins are used for its base. Anyone who has ever encountered epoxy knows very well how to use it. The hardener is mixed with resin 10 to 1, an adhesive is formed, but its use will not be appropriate in every situation.

There is no rule on how to use the solution so that it is as effective as possible and not spoiled. More specifically:

• when gluing, do not touch the parts and move them from place to place, the full gluing effect is achieved after a day;
• it is necessary to completely prevent water from entering the adhesive composition, even in the smallest quantities;
• The adhesive will be most effective when it adheres tightly and flatly. The possibility of forming volumetric seams is excluded, since the composition has high fluidity.

How to choose cold welding?

Before using cold welding, you need to understand what criteria are used to select it correctly. First, the purposes for which the cold welding will be used are determined.

Glue can be purchased in almost every automobile or construction store, as well as in markets. The brand and manufacturer play an important role.

A quality product is always selected, since welding is most often used not for one-time gluing, it should be used once and for a long time.

Preparing for work

First, prepare the working surface and the material on which the glue will be applied. If necessary, dry it and wipe it with a dry cloth.

After removing all the bends and uneven places, sanding is done with sandpaper. After the manipulations have been done, the surface should be degreased, for example, with acetone.

Do not pour it onto the part, but apply it to cotton wool or dry cloth and wipe the areas for gluing.

How to use?

When the surface and all materials are prepared, be sure to put on special gloves, and only then start working. The glue is squeezed out and kneaded with gloved hands, previously soaked in water. This procedure lasts about 3 minutes.

This is necessary so that the glue heats up, loses its plasticity and hardens. When the goal is achieved, the mass is applied to the required surface. Then the materials or parts are connected with mandatory fixation, using clamps; here you can improvise, taking, for example, a tourniquet.

The glue will harden within an hour or 20 minutes, depending on the situation.

What materials are welded for bonding?

When used correctly, cold welding is suitable for almost everything. Only those materials that have a flexible structure are not subject to gluing. Let's consider specific types of matter:

1. Linoleum or carpets. They can be glued both to the floor and to the joints;
2. Plastics other than polyethylene;
3. Metal. It is possible to glue together the same or dissimilar materials;
4. Ceramics and ceramic tiles, gluing occurs end-to-end;
5. Stone and glass;
6. Tree.

Welding when gluing metal

Cold welding is used to join non-ferrous metal and iron. Work begins only after convenient access to the damaged surface is ensured. Then the cleanup occurs. This will ensure the quality of work and the strength of the glued area.

If the glue has an initially liquid structure, it must be squeezed into a container and kneaded to the desired consistency. After this, the glue will have more reliable properties. Prepare glue in small portions.

Because upon first application it will set in 10-20 minutes. But if a large amount of the mixture is prepared at once, there is a possibility that you will not have time to use it all.

Since the glue cannot be stored, any excess will have to be thrown away.

Once the cold weld is applied to the parts, try not to subject them to any stress. You need to wait until it hardens completely, only after that the corrected technique is ready for use.

Experienced motorists always have such glue in their car, especially on long trips. There is no more indispensable material on the road than this. But the full effect of welding will be achieved only if it is used correctly.

Safety rules when working with cold welding

Under no circumstances should welding be allowed to come into contact with the eye or skin. But if this has already happened, the eyes, like the skin, are thoroughly washed. Afterwards, just in case, you should consult a doctor. To avoid the above, gloves and safety glasses are used.

Adviсe

For better adhesion of parts, it is recommended to apply glue to a damp surface. The method is most popular in problems with leaks in pipes or a toilet barrel. This is due to the fact that it is not necessary to shut off the water. The glue is simply applied to the damaged area. For quick hardening, the welding can be heated, for example, with a regular or construction hair dryer.

Conclusion

To summarize, we can say that we have found out how to use cold welding correctly, analyzed its varieties and studied the methods of application. With adequate use, there is always an opportunity to solve a wide variety of problems, both at home and at a professional level.

Sergey Odintsov

Source: https://spb-metalloobrabotka.com/suhaya-svarka-kak-polzovatsya/

Dry welding application - Metalworker's Handbook

Cold welding: what is it and what types of it are there?
Cold welding for metal: instructions for use

Today we can safely say that the technology of cold welding of metals and other materials is known to almost every person - every first person has heard about it, and every second person has already tried it. But here’s the paradox: most people are simply not able to fully appreciate this technology – it’s all due to improper use.

Well, our people don’t know how to read instructions and pay attention to little things, without which not a single modern technology can do, including cold welding. This is what this article will mainly be about. Together with the site stroisovety.

org we will look at the issue of using this technology at home and answer the following questions: what is cold welding, what properties does it have, how does it work and, ultimately, what is it used for?

Cold welding photo

Cold welding: what is it and what are its varieties?

Cold welding for metals can be briefly described as follows: it is a highly plastic adhesive made on the basis of epoxy resin. It can be either one-component or two-component - in the second case, it becomes possible to store the composition for a long time. The first one is used all at once, otherwise it simply disappears.

Such glue is made in the form of a tube or sausage (as you wish) - the outer part of this sausage (say, the skin) is a hardener, and the inner filling is nothing more than epoxy resin mixed with metal dust, the task of which is to ensure durable and stable connection.

The matter cannot be done without additives, which include sulfur and some other components, which, as a rule, are classified, since they are fully responsible for the quality and technical characteristics of cold welding.

Types of cold welding photo

This type of glue does not differ in special varieties - its types are determined solely by the purpose, or rather the ability to glue certain materials. This ability is entirely dependent on the filler.

1. Cold welding for metal. Today, this indispensable glue is found in the trunk or glove compartment of every car enthusiast - with its help, you can simply put the car on its feet and, without any problems, not only get to the nearest auto repair shop, but also fully operate the car for some time. Using cold welding for metals, you can easily patch up a broken oil pan, radiator and other parts of the car that do not experience heavy loads when driving. Moreover, this type of glue is widely used by plumbers to temporarily fix leaks. In general, the word “temporary” is the key point in the whole cold welding story, despite the saying that there is nothing more permanent than temporary. No matter how hard you try, any leak fixed with cold welding glue will renew over time - you should understand that after some time it is better to eliminate leaks thoroughly.
2. Cold welding for plastic. This is a less common type of glue and can be called specific. Despite this, it is widely used both in everyday life and in production - the domestic purpose of such adhesive compositions comes down to the same repair. Plastic today is used for the manufacture of many household appliances, including their cases, which very often burst.
3. Cold welding for linoleum is an exclusively highly specialized construction adhesive. Once you use it to join linoleum joint to joint, no large double-sided tapes or glues will be to your taste. Cold welding linoleum adhesive can also be used to join rigid rubber products.

   Cold welding for linoleum photo

There are other types of cold welding designed to solve similar problems of joining different materials. All of them cope well with the assigned tasks, provided, of course, that they were used without violating the technology. This is exactly what will be discussed next.

Cold welding for metal: instructions for use

All types of cold welding glue have a similar application technology - there is no difference between them. It is for this reason that we will consider the question of how to use cold welding using the example of eliminating leaks in iron pipelines.

Let's present this technology point by point, but first let's deal with one point - cold welding can equally successfully eliminate leaks in both empty containers and those under low pressure.

If there is coolant in the car radiator, then it is not necessary to drain it to seal the hole. The same can be said about pipelines.

But let’s return to the actual technology of using cold welding. It looks like this.

1. First, prepare the surface to be glued or glued. We clean it in the most thorough way with coarse sandpaper, so that not only dirt and old paint are removed, but also scratches are formed on the surfaces that are visible to the naked eye. They are needed in order to ensure high-quality gluing - you cannot do without them, so there is no need to be shy and you need to scratch thoroughly. Naturally, within reason.
2. Dry the surface - you can even use a hairdryer. If the surfaces being glued by cold welding are heated, this will only be beneficial. I’ll make a reservation right away - cold welding sticks to a wet surface, but it makes it many times worse. In this case, you cannot expect good quality, and this approach to the matter is correct only in the case of temporary elimination of leaks.

   How to use cold welding photo

3. Degreasing surfaces to be bonded. This is a mandatory stage of work that ensures the reliability of the connection. Even if fat is not clearly visible on the surfaces, this does not mean that it is not there - even a tiny fraction of fat transferred to the bonded surface from the fingers is quite enough for the joint to turn out to be unstable and of poor quality. This stage of work should not be ignored.
4. While the acetone dries, prepare cold welding. To do this, we cut off a small amount of material from the sausage - we cut it strictly across, since in most cases we are dealing with two components located one inside the other. Knead the cut piece thoroughly with your hands until you obtain a plastic, soft, and most importantly homogeneous mass. During the mixing process, the material will heat up a little - this is normal and you should not focus on this.
5. We apply the prepared cold weld to the surface to be glued or sealed. This should be done immediately after mixing - most compositions begin to polymerize (solidify) within a couple of minutes after preparation. If we are talking about sealing a hole, then cold welding must be applied so that it penetrates inside the hole. If it is too large, then it is better to install a patch made of sheet iron on it, gluing it using the same cold welding.

   Cold welding glue in action photo

All! Let the repaired area dry. Complete hardening of this type of glue occurs within 24 hours. After this time, the area to be repaired can be cleaned, primed, puttyed and painted - in general, there are all the prerequisites for eliminating holes even in the front decorative surfaces. For example, in a motorcycle gas tank.

And to conclude the topic, a few small tips that will help you use cold welding safely, and most importantly, ensure a reliable and tight connection with it.

First, carefully read the instructions - words are words, but different manufacturers may have their own nuances of use. Secondly, do not forget about the rules for using substances such as acetone - they are by no means safe and can cause serious injury if they get into your eyes.

In general, cold welding is an unpretentious material - in this respect it can be compared with ordinary glue, for example, for shoes.

Author of the article Alexander Kulikov

Source: https://ssk2121.com/suhaya-svarka-primenenie/

How to use cold welding?

What is cold welding? This question is asked by many of those who are planning to use this tool for quickly joining metals.

Without a doubt, many people have heard about cold welding, and a sufficient number of people have already recognized all the advantages of this technology.

But, unfortunately, not all of those home craftsmen who have already tried to connect metal parts using such a means were able to appreciate all of its unique characteristics.

Cold welding for metal

The main reason for this situation is that very often our people do not consider it necessary to carefully read the instructions, which stipulate all the nuances of using a particular device or technology. That is why we want to devote this article to all issues related to the rules of use and scope of such a wonderful tool, which, undoubtedly, is cold welding.

Types of cold welding

In essence, cold welding is an adhesive with a high degree of ductility, made on the basis of the well-known epoxy resin. In terms of its structure, this glue can be two-component, in which case it can be stored for a long time, or one-component, which must be applied as quickly as possible so as not to encounter the loss of its adhesive properties.

As a rule, such a product is produced by manufacturers in the form of a two-layer cylinder, the outer shell of which consists of a hardener, and the inner core is epoxy resin mixed with metal dust.

This additive in the form of metal dust is necessary to give the resulting connection high strength and reliability. Contains cold welding and other additives, which give it, as well as the compounds obtained with its help, unique characteristics.

Manufacturers keep most of these additives secret, but the most famous of them is sulfur.

Cold welding is classified mainly according to its area of ​​use, that is, according to those materials that can be joined using its various types. So, today the following types of this product are successfully used.

Cold welding for metal

This tool is actively and successfully used not only by home craftsmen, but also by car enthusiasts, as it allows you to quickly and effectively solve many problems associated with car operation. The connections obtained with its help make it possible not only to forget about the problem that has arisen for a short time, but also to use the restored parts for quite a long time.

However, it should be borne in mind that cold welding demonstrates itself optimally when connecting those parts that do not experience significant loads during operation.

This product has also found wide application in the repair of plumbing fixtures, in which it is necessary to promptly eliminate any leaks that have arisen.

But no matter how reliable it is, you should always remember that it only serves to eliminate the problem that has arisen only temporarily. At the first opportunity, you should use major repair methods.

Cold welding adhesive for various types of plastic

This tool, which is less common, is used, as its name suggests, to perform quick repairs of plastic parts.

This glue is used both in manufacturing enterprises and for performing repairs at home.

Most often, the need to use such a tool arises in cases where it is necessary to repair plastic pipes and housings of various devices.

Types of cold welding for various materials

Cold welding used to join linoleum

This glue can also be used in cases where it is necessary to connect products made of hard rubber.

Naturally, such welding has found wide application in construction and repair work.

It should be noted that linoleum joints obtained with its help are significantly superior in their characteristics to those for which glue or double-sided tape was used.

We have listed only the main types of cold welding, but there are others that are less common. All these means are distinguished by high efficiency of obtaining and reliable connections, provided that when performing the work, all necessary requirements were strictly adhered to.

Application of cold welding for metal

Cold welding for metal, instructions for use of which are in each package, is used in almost the same way as other types of such a product.

In order to understand how to use this glue correctly, it will be enough to look at the example of eliminating leaks in pipelines and containers made of metal. What’s convenient is that this welding can be used both in empty and filled containers, and even those that are under slight pressure.

That is, for example, if you need to fix a leak in a car radiator, then it is not at all necessary to drain the liquid from it.

Part after repair by cold welding

So, the algorithm for working with such glue is as follows.

• First of all, you need to prepare the surface on which the glue will be applied. To do this, it is better to use sandpaper, which is used to clean the surface from dirt and rust. Such cleaning should be completed if metal with scratches applied to it with sandpaper becomes visible on the surface being treated. Moreover, the deeper and more frequent such scratches are, the more reliable the connection will be.
• Then the surface should be thoroughly dried. You can use a regular hairdryer for this; you don’t need any special technical equipment. Of course, cold welding for metal can also cope with wet surfaces, but one cannot count on high reliability and tightness of such a connection.
• The next step, which will make the resulting connection more reliable, is degreasing the surface. To do this, it is better to use acetone, which will remove even minor grease stains on the surface being treated.
• Next, we proceed to preparing the adhesive composition itself. Since this product is not liquid, but rather dense, we use a knife to cut a piece of the required size from the cold welding cylinder. It is very important to make the cut strictly across the cylinder in order to maintain the original proportions of hardener and epoxy resin in the resulting piece. The cut piece must be thoroughly kneaded until a soft and uniform-colored mass is obtained, and so that the product does not stick to your hands, you can periodically moisten them with water.

The process of applying welding to a repaired surface

• After you have obtained a soft and homogeneous mass of the product, it must be quickly applied to the surface to be repaired. The technical characteristics of many types of cold welding are such that it begins to harden within a few minutes after preparation, so you need to act quickly but carefully. If you seal the resulting hole using cold welding, it is very desirable that some of the soft mass gets inside it. If such a hole is too large, then it is better to seal it with a metal patch, which is fixed to the surface using cold welding.

After the product is applied, it must be given time to dry and completely harden, which can last up to 24 hours. Only after this time has passed can the repair area be subjected to finishing (cleaning, puttying and painting).

In any case, before starting to use cold welding, it is better to read the instructions again or even watch a training video, which can be easily found on the Internet.

It is very important to be careful when using degreasers, most of which are dangerous to human eyes and mucous membranes.

In general, using such a tool is not difficult, and the connections that it allows to obtain are quite reliable and tight.

Source: https://postroikado.ru/kak-polzovatsya-xolodnoj-svarkoj.html

Dry welding how to use

Cold welding is not at all like real welding. What is cold welding? This is the name given to a very strong two-component adhesive, sometimes filled with powder from the material for which it is intended. Real welding occurs when joining due to the establishment of interatomic bonds of the elements being welded, under the influence of heat or high pressure. In the case described, we are talking only about gluing.

Therefore, cold welding for metal differs from its other types only in the adhesive composition and filler, but this is not as little as it might seem at first glance.

Cold welding is generally resistant to heat, but not above 250 °C.

Advantages

The frequent use of this adhesive connection is due to a number of advantages:

• the thick adhesive seam does not weaken the structure;
• the ability to connect products that differ in both the chemical and physical structure of materials;
• resistance to acids and alkalis;
• slight shrinkage;
• no volatile emissions after curing;
• ease of use;
• not hygroscopic.

Cold welding consists of two components:

• epoxy resin with added filler;
• hardener.

When mixed, they enter into a polymerization reaction. This reaction is irreversible, meaning the cured resin does not dissolve or melt like a thermoplastic.

The use of filler reinforces the seam and increases its strength.

Consistency

According to this parameter, cold welding is divided into three groups:

• liquid like resin;
• pasty;
• in the form of putty, soft and pliable like plasticine.

Which one to choose depends on the place of its application.

Mode of application

Required materials and tools:

• adhesive composition (welding);
• sandpaper;
• acetone or solvent for nitro paint;
• a clamp or other device for fixing the parts to be glued;
• latex gloves.

Cold welding for metal. Instructions:

1. Surface preparation. The surfaces of the parts on which the adhesive will be applied must be cleaned with sandpaper, the remaining abrasive and sawdust removed from them and degreased with acetone or solvent after wearing gloves.
2. Mix the required amount of adhesive with hardener.
3. Apply the finished composition to one of the prepared surfaces, put the parts together and fix them.
4. Gluing work with this product should be carried out at a temperature not lower than +5 °C.
5. The composition completely polymerizes after 24 hours.

The rate of polymerization does not depend on the amount of hardener. It depends on the temperature of cold welding. Increasing the temperature of the mixture by 10 °C accelerates the polymerization process by 2 - 3 times.

Adhesive compositions can be elastic or hard. As a rule, they are not critical to the accuracy of the proportions of mixing the resin with the hardener. These proportions are usually in the range from 100/40 to 100/60. They are equipped with cold-type hardeners (that is, heating them is not necessary).

Useful tips

• When repairing large areas, torn or cracked surfaces, reinforce the adhesive layer with a metal mesh made of thin wire or pieces of fiberglass.
• An adhesive in the form of putty is better suited for gluing parts end-to-end and for restoring lost fragments. It is more convenient to use liquid and paste for gluing overlaps and leveling surfaces. They are also better suited for reinforcement than solid reinforcement.
• To remove old hardened liquid welding, use a heated soldering iron; it helps in this case, despite manufacturers’ assurances of the heat resistance of their products.
• Do not mix more adhesive hardener than you can use within three minutes. Since the strength of the composition used later decreases greatly. The adhesive properties of the mixture also deteriorate.
• To level the surface of the adhesive layer, use a metal spatula dipped in water.
• Before applying the adhesive, dry the surface thoroughly and do not try to apply the adhesive to a wet surface - no cold weld will stick to water.
• Some craftsmen add a solvent to it to reduce the viscosity of the composition, however, this should not be done, since even a small solvent content in the adhesive mixture reduces the strength and heat resistance of the seam.

A little chemistry

Significant differences are observed in the properties of compounds cured under the influence of polyfunctional substances used to form cross-links, that is, catalytic hardeners.

For example, epoxy compounds cured with a tertiary amine have greater tensile strength, while those cured with a primary amine, although initially strong at elevated temperatures, become more brittle with aging. The influence of thinners on the properties of various compounds has also been studied.

Which showed a greater influence of the weighting of the diluents on compounds of group A 3. The size of the filler particles also greatly affects the properties of the cured mixtures.

From the above we can conclude that all adhesive mixtures may seem the same only at first glance. In fact, their properties are very different.

No matter how good cold welding is, it is just glue, so it is not recommended to repair critical parts and assemblies of the car with its help.

Recommendations for selection

Experience in using cold welding suggests that it is better to repair plastic parts with the Polyrem composition, since after hardening this composition retains a fair amount of ductility. No one said anything good about Almaz.

Several people praised the products of ABRO - Steel and HI-GEAR - White Titan, Flexoplast. The first two compositions are good for repairing metal parts, and the last one for plastic ones.

All compositions are characterized by high seam strength and excellent adhesive properties.

Source: https://steelfactoryrus.com/suhaya-svarka-kak-polzovatsya/

Dry welding for metal: instructions for use, characteristics, pros and cons

The active development of high-tech methods for thermal welding of metals is overshadowing alternative processing methods. At the same time, there are quite worthy techniques for the ancient cold deformation of plastic products. These methods include dry welding. For metal, in particular, directional deformation with increasing internal stress is applied. A variety of active agents, tools and consumables can be used in this process.

General information about the technology

Dry welding is one of the types of cold welding work in the solid phase, during which significant deformation processes occur with an insignificant degree of localization of the working structure. An important difference between this technique is the high pressure applied to carry out the deforming processes.

Compared to basic thermal hot welding methods, this technology makes it possible to perform the operation at normal or even negative temperatures. The above photo of dry welding for metal under pressure shows the result of such work under temperature conditions below the degree of recrystallization.

The main direction of this technology is the mechanical impact on the material, as a result of which a connection is formed between two or more workpieces.

Standard dry welding technology is performed according to the following instructions:

• Plastic extrusion of the metal is performed, affecting the deep structure. In this operation, special units are used to ensure the deformation process.
• After the end of the deforming effect, contact between the deep layers of the metal is formed.
• A single crystal structure is formed. The time required to perform dry welding for metal at this point can be calculated in fractions of seconds, which results in the absence of volumetric interaction between the workpieces.
• Special external surface treatment is carried out with protective and strengthening compounds, including those with anti-corrosion effects and the effect of relieving internal stress.

Main characteristics of the process

The parameters of the operation, on the one hand, reflect the magnitude of the physical impact on the workpiece, and on the other, the quality of the connection. The primary characteristics of both spectra include the following:

• Depth of indentation. Typically, a punch is used for deformation - a pressing tool, due to which the shape of the part changes. Also, this characteristic of dry welding for metal can be assigned as a degree of ductility, which, depending on the material, can allow a coefficient of inclusion in the structure from 10-15% (indium) to 85-90% (copper, nickel).
• Compression action. It is expressed in terms of compressive force and shear, which is calculated from the tangential force. This is not a direct indicator of a change in structure, but a characteristic that causes potential displacement of the joined surfaces.
• Welding ability. Depends on the complex resistance of the metal structure to the mechanical effects of dry welding. The most accessible products for such operations are considered to be products made of copper, aluminum, silver, cadmium, etc. As hardness increases, welding ability decreases.

Types of dry welding

Basically, the methods are distinguished by the type of connection formed, as well as during thermal exposure. This can be butt, spot and seam welding. Less commonly used are shear and high-pressure joining techniques. When performing spot welding, cylindrical punches are used as a tool, and when using the seam technique, roller elements are used.

Both of these methods are characterized by high productivity, but as a result they produce rather rough and outwardly unattractive seams. Dry butt welding for metal involves the use of special pressures, as well as making notches to prevent the workpiece from slipping. The advantages of the method include the ability to work with solid parts and, in principle, the use of high pressure, which increases the power of the deformation force.

On the other hand, due to the need to apply notches, the appearance of the product can deteriorate even in places outside the working area.

The problem of preparing materials for dry welding is determined by the need to carefully remove adsorbed and organic films.

These may include traces of oil and grease, as well as acid and paraffin coatings, which are often applied to preserve and support other industrial processes.

To remove such layers, alcohol- and gasoline-containing products, solvents and special chemicals for metal processing are used. In addition, the instructions for dry welding for metal involve performing the following preparatory operations:

• Cleaning surfaces with steel abrasive brushes.
• In the case of aluminum billets, calcination is used at temperatures from 300 to 400 °C.
• Coating the product with a thin layer of chrome or electroplated nickel.
• If we are talking about conductors with insulation, then all outer protective layers are removed with a small coverage of the non-working area.

Welding mode parameters

Among the main parameters of this type of welding are the protrusion of the part from the clamp, specific pressure, thickness of the punch, etc. For example, the pressure indicator is selected based on the physical and mechanical characteristics of the target workpiece. Thus, aluminum is welded at 800 MN/m2, and copper parts - at 2500 MN/m2. As for the workpiece leaving the clamping mechanism, in this case everything is individual.

For example, for aluminum rods with length d the overhang value will be 1.2d, and for copper – 1.5d. The coefficients may also vary depending on the shape of the part. When assessing suitable parameters, special attention is paid to the dimensions of the punches that directly implement dry welding. For metals like copper and aluminum, the characteristics of the pressing mechanism are calculated based on the fact that the applied load should be from 600 MPa to 2000 MPa.

Dimensional parameters are adjusted to the weight of the structure, and the shape and design are adjusted to the parameters of the product.

Performing dry welding

Using special pressing equipment, the operation is performed in the following order:

• Clamps corresponding to the size of the workpieces to be welded are fixed.
• To ensure the required pressure, compressed air is supplied to the machine through a compressor.
• The functional unit is brought into an active state, the force of which causes deformation.
• Immediately before dry welding for metal, the instructions for using the technology indicate the need to treat parts with acetone or alcohol.
• The rods of the workpieces are welded and the flash is trimmed (excess metal at the joints, which was released when extruded).
• The welded elements are released from the clamps.
• The moving mechanism returns to its original position, the clamps are loosened.

Throughout the entire work process, the operator interacts with the functionality of the machine through handles, control levers and devices for feeding workpieces. Modern models of equipment for dry welding also provide electronic means of operation control, with the help of which the in-line processing of parts is organized.

Advantages of dry welding

Eliminating the need for high-temperature heating of workpieces is the main advantage of this technology compared to electrochemical types of welding. This eliminates the use of powerful energy sources, removing a significant cost item.

In the same group of advantages, one can note a reduction in the likelihood of electrochemical clogging, from which during thermal methods it is necessary to protect the workpieces with gaseous media and flux.

Also, depending on the complexity of the task and working conditions, there are other advantages of dry welding for metal:

• High productivity with little time investment.
• Minimum set of auxiliary and consumable materials.
• Possibility of process automation.
• The operator does not necessarily have to be a highly qualified welder.
• Requirements for post-processing of parts are minimal.

Disadvantages of dry welding

Despite all the advantages, this technology is not as widespread as hot welding, which is explained by severe limitations in terms of the method’s suitability for metals and alloys with low ductility. Preferably non-ferrous and pure metals can be processed.

But even in this case, you cannot always count on high quality results. Moreover, the main technological disadvantages of dry welding for metals of high ductility are associated with deformation of the internal structure, which can negatively affect the future operation of the product.

In general, we can say that the technology is convenient and low-cost, but not universal and rather highly specialized.

Conclusion

Cold welding methods have fundamental differences with thermal technology for joining metal workpieces. They are related to the nature of the impact on the structure of the material and the conditions of the technical organization of the process.

As reviews of dry welding for metal show, this method works well when working with electrical consumables, small workpieces from the electrical industry, etc. We are mainly talking about conductors and small stamped elements.

If it comes to metal structures, large-sized pipes and stainless steel sheets, then the work process should be trusted to high-temperature welding. Changing the structure due to deformation in such cases will be ineffective.

Source: https://FB.ru/article/423289/suhaya-svarka-dlya-metalla-instruktsiya-po-primeneniyu-harakteristiki-plyusyi-i-minusyi

How to choose

Naturally, before using cold welding, you need to purchase it, and at the same time, choose the right one. Also for work you will need fine-grained sandpaper and acetone. The place where cold glue is sold can be in markets, car dealerships, construction stores, etc.

places, but you still need to pay attention to the brand itself and the manufacturing company, because there are a huge number of them. Of all the variety presented, it is better to give preference not to the cheapest product, but to the one with an average price.

Perhaps your friends have already had experience with such purchases and they can advise you; if not, then you will have to select the product yourself.

Surface preparation

The surface on which cold welding will be applied must become dry during preparation; for this you can use an ordinary soft rag. Then sandpaper is used and the areas to be glued are thoroughly cleaned.

Plus, it is necessary to leave some of the resulting irregularities, the glue will go there better, and the connection will become as strong as possible. After cleaning, the surface is degreased, and for this we prepared acetone.

We take, for example, a disk of cotton wool or a soft cloth, apply liquid to it, and wipe it in the place where we have cleaned and which will stick together; this stage is also important to obtain a good result.

Welding preparation

We read what is written in the instructions before using cold welding, where it is indicated that it needs to be squeezed out, or cut off, having decided on the quantity. Then the hands are wetted and the substance is kneaded to the required consistency so that it becomes homogeneous. The glue should be applied with quick movements, and as for hardening, it lasts from an hour to 24 hours.

How to use cold welding video

Source: https://svarnou.ru/kak-polzovatsya-xolodnoj-svarkoj/

How to use cold welding? — Homework

Cold welding - this substance appeared relatively recently. In terms of its characteristics, it is practically not inferior to classical welding, and in some even surpasses it.

Most often it is used to repair small products or seal small holes. As can be understood from the name of the material, high temperatures are not used during its application.

Many people know about the existence of this material, but they do not know how to use it correctly.

First you need to understand that cold welding is just a name. This substance has no direct relation to welding in the standard meaning of the word. It got its name because it is capable of connecting parts with almost the same level of strength as is done using classical welding.

In fact, cold welding is glue. With its help, you can not only connect products to each other, but also seal holes and fill cracks. This substance can be used without problems with almost all materials, and they do not have to be homogeneous.

You can easily attach glass to wood, plastic to metal, etc. Each operation has its own conditions and features.

Therefore, in addition to universal cold welding, in the assortment of almost every hardware store you can find specialized modifications that are aimed at use with a certain type of material.

In order to connect something using cold welding, it is not necessary to have experience behind you or to have any additional knowledge and tools.

Of course, the strength of the connection cannot fully compete with classical welding, but this substance is ideal for repairing small products at home.

It is worth noting that cold welding can be used even for products whose working activity occurs at high temperatures; for this it is only enough to purchase a certain modification of the glue. Some varieties are able to retain all the properties of the compound even when exposed to temperatures above one thousand degrees Celsius.

Using cold welding glue

The substance, regardless of modification, is universal. In addition to using it at home, it is used even in small industrial work. Cold welding can provide a strong connection even between metal and non-metal.

Just like classic welding, cold welding can be used to seal cracks. A distinctive feature is that the glue can be used like plasticine: mold the necessary part and replace the broken one with it.

Due to the presence of additional fillers in the material, the molded product may be even stronger than the original.

Cold welding has a very wide range of applications in plumbing. This is due to the fact that the substance can easily cope with the pressure of a water pipe. Cars are often repaired using this glue.

Small cracks or chips can be repaired without dismantling parts. A cold welded joint does not react in any way to the effects of almost all acids and alkalis. This property has made the use of this adhesive popular for repairing gas tanks.

He can also easily cope with the repair of glass, furniture, construction tools, etc.

In order to use this substance for metal products, you must strictly follow a certain algorithm of actions.

1. The first, very important step is the preparatory stage. It includes complete cleaning of the bonded surfaces from contaminants (traces of oil, gasoline, grease, etc.). Also, if there are traces of rust on the metal surface, they also need to be removed. Any solvent can be used to perform this operation without any problems. If the metal surface is smooth, it needs to be sanded. This is done to obtain a stronger connection in the end.

1. Next you need to cut off the required amount of substance. If you are using cold welding as two separate components, they must be mixed in a strict one to one ratio. After which the material needs to be kneaded to a plastic state, as soon as it warms up, you can begin to use it. The layer thickness should not exceed values ​​higher than 6 mm. If it is necessary to use a greater thickness, the gluing process must be carried out in two stages. Moreover, the second layer can be applied only after the first has completely dried.
2. After connecting the parts, it is imperative to create pressure on them. To do this, you can use a tourniquet or a press. After which you need to wait for the initial drying time, then you can remove the pressure. As a rule, initial drying does not take more than three hours, but complete drying occurs after twenty-four hours (the time value may vary depending on the brand of cold welding; in order to find out the required holding time, you need to carefully read the instructions for use).

When working, you must use rubber gloves, since the adhesive composition can cause severe allergic reactions upon contact with skin. If glue gets on the skin, the affected area should be washed under plenty of running water.

After which, in order to avoid negative effects on the human body, you need to consult a doctor as soon as possible to show him the affected area.

Also, before going to the doctor, you need to take some cold welding packaging with you.

After the joints have completely dried, many people have a question: “How to remove glue residue from the surface of the product?”

In order to protect yourself from the unaesthetic appearance of the finished product, it is better to remove the excess with a spatula immediately after applying the glue.

If the composition has already hardened, it will be more difficult to get rid of welding marks. Many people practice the hammer tapping method.

Cold welding for linoleum

As already mentioned in the material described above, cold welding is a universal substance. However, before using it on any material, you need to know how to apply welding to it. Very often the question arises: “How to glue linoleum using cold welding?” To do this, you need to follow several step-by-step steps.

To begin with, you need to secure double-sided tape at the connection point so that the substance does not spread over the entire area.

You need to put a small nozzle on the package with glue, which will distribute the adhesive substance evenly in a small stream (most often such a nozzle is included in each package).

Once the entire cut is filled with glue, you need to wait about half an hour and then remove the tape. Excess glue must be removed immediately using a rubber spatula.

Source: https://homeandworks.ru/kak-polzovatsja-holodnoj-svarkoj.html

Cold welding composition

• All existing positive qualities of epoxy resin are transferred to cold welding. Epoxy resin . This material is characterized by good ductility. It fills all the crevices and other imperfections of the surface being treated. Epoxy has another characteristic feature, and it is that it hardens when mixed with various thickeners.
• Filler.As a rule, various modifiers, plasticizers, sulfur and metal act as an added substance intended to improve the technical properties of the main ingredient. With the help of a filler, the mixture hardens and hardens much faster. Cold welding also acquires a number of positive properties, namely:
  • resistance to humid environments,
  • the ability to withstand a large number of cycles of sudden temperature fluctuations without destruction.

  In cold welding intended for heating radiators, metal chips must be used as a filler.
  For plastic pipes, sulfur is added to the binder component.

Cold welding is a two-component mixture.

All elements are combined into one whole a few minutes before use.

Types of adhesives

Many ordinary people doubt the effectiveness of this method of repairing heating radiators.

But, as can be seen from practice, this is not true.

The wear resistance of the resulting seam or joint depends on how correctly the connecting element is selected.

What do you know about the sizes of cast iron heating radiators? Read about batteries in this helpful article.

How you can eliminate leaks at the joints of sewer pipes is written here.

On the page: http://ru-canalizator.com/vodosnabzhenie/avtonomnoe/mufty-pnd.html it is written about electric welded couplings for HDPE pipes.

Systematization by physical content:

• fluid mixtures
• plastic mass.

If you decide to buy a liquid product, pay attention to the packaging, it should contain 2 tubes. One with an elastic substance, the other with a hardener.

They are mixed immediately before eliminating the leak in the plastic pipe at the junction.

  How to weld a vertical seam using arc welding

Please note! The mixture must be consumed within 20 minutes, otherwise it will thicken and become unusable.

Before use, plasticine should be kneaded well. If you don't need all the material, you can cut it, but only crosswise.

Experts strongly advise using cold welding to restore only those materials for which it is intended.

On the packaging of the composition, the manufacturer always indicates the temperature that the mixture can withstand (in most cases, this is 260 degrees Celsius).

If these parameters are observed, the seam will remain strong for a long time.

There are cold welds on the market that can withstand much higher temperatures (up to 1300 degrees Celsius).

This adhesive is used for surfaces exposed to very high heat.

Positive aspects of use. 

1. Ease of use . The composition can be used by a person who has not previously had any experience in plumbing;
2. The quality of the resulting seam does not depend on the speed of your actions.
3. There is no need to use special tools and equipment (read about couplings for connecting HDPE pipes here).
4. Energy consumption is kept to a minimum.
5. The material has fire-fighting properties.
6. Ability to repair tanks containing explosives.
7. There is no surface tension of the material in the weld area.
8. Low material cost.

Negative sides.

1. Using cold welding, only metals with high ductility can be joined.
2. During operation , the material is subject to deformation.
3. Using this method, parts of certain shapes and sizes are joined.
4. In order for the work to be completed efficiently, a large area of ​​​​metal must be used.
5. Cold welding is a temporary solution to the problem.

Methods of use

Before you get started, you need to prepare everything you might need:

1. welding material,
2. acetone,
3. sheet of sandpaper,
4. if necessary - clamps,

Step-by-step instructions for welding plastic heating pipes:

• the first thing to do is to carefully prepare the surface of the material to be repaired. The pipe sections must first be treated with sandpaper and then degreased. Irregularities on the product will increase the level of adhesion to the adhesive. Residues of fat, when entering into a chemical reaction with the components cold welding will worsen its characteristics;
• Next, we determine the exact permissible deviation of the perpendicularity of the edges. If your heating system contains pipes with a cross-section of 20 - 40 mm, the tolerance should not exceed two millimeters;
• in order to accurately determine the size of the surface to be treated, half the length of the coupling must be measured at the ends of the hollow product;
• using these marks, remove a thin layer of material from the pipe (maximum 0.2 mm) and remove all burrs;
• prepare the adhesive composition: mix all the ingredients until a homogeneous mass is obtained. When using plasticine-like mastic, you need to wet your hands in clean water. If this is not done, the paste will stick to the skin. You need to work with liquid compositions very quickly;
• We apply the finished mixture to the surface to be repaired. To improve the gluing effect, it is worth using a special clamp. The instructions supplied with the product indicate how much force can be applied to the seam.

A pipeline that has been repaired by cold welding is put into operation no less than 8 hours after welding.

Repairing a cast iron radiator

In this case, it is necessary, first of all, to prepare the surface of the product - it must be clean, dry and grease-free.

The procedure can be done with a cotton swab dipped in alcohol. Then take a small piece of the composition in the form of plasticine and knead it with your fingers.

You should get a ball measuring 20 - 25 mm.

to the damaged area and press it down with a screwdriver or a thick rag.

The ball must be held in this position for 3-5 minutes.

The mixture will harden completely in 35 - 40 minutes due to the polymerization process.

The battery will be ready for use only after 24 hours.

At temperatures below +5 degrees, it is not recommended to use cold welding. When handling mixtures, you need to wear gloves and safety glasses.

If your home has a single-pipe heating system, then before you begin repairing the damaged area, you need to turn off the water supply

When eliminating a fistula on a hollow object, it is best to use a liquid composition that soaks pieces of fabric and wraps the damaged areas.

Using this method, you can reliably caulk the leak and wait until the end of the heating season.

Only with the help of a specialized product with characteristics that allow the mixture to work under the influence of high-temperature liquids will you get a high-quality connection.

Using such compositions, you can seal a fistula in a riser with hot water.

Remember! Cold welding is a temporary measure to eliminate leaks in heating radiators.

  Connecting galvanized pipes without welding

In this way, small damage can be eliminated.

At the first opportunity, the leak should be repaired using semi-automatic welding or an inverter.

When working with adhesives, issues related to personal safety should come first.

Worth knowing! It is impossible to revive complex joints by cold welding.

It is necessary to ensure free access to the repair site.

Do not forget that this composition can only be used as a gluing element. It will not withstand even the slightest pull-off impact.

Therefore, this technique can only be used for its intended purpose, and it is necessary to correctly calculate the conditions for using the mixture.

Cold welding for heating radiators must be of high quality. Otherwise, the seam may not hold up and then the cost of repairs will be too high.

Watch the video to see how “cold welding” is used for large-diameter pipes.

Source: https://respect-kovka.com/suhaya-svarka-kak-polzovatsya/

How to use cold welding correctly - application options

Our life is a rather unpredictable thing and you never know what awaits you in an hour or around the next corner. This is especially true for motorists, since a long road is full of surprises and sometimes a minor breakdown and delay along the way can be fatal.

Therefore, drivers quickly appreciated cold welding for minor repairs for emergency connection of metal and other surfaces. There are samples of this amazing product that harden in a couple of minutes and adhere firmly within 10-15 minutes.

This property makes this product unique and indispensable in the home, country house and road.

Every motorist, summer resident and owner of a private home should know how to use cold welding correctly Let's find out all this in detail.

How to use cold welding correctly

What kind of cold welding is this?

This is an adhesive composition that creates a high-strength connection similar to real welding. The composition can consist of 1-2 components, where the base is epoxy resin, as well as fillers for thickening and reinforcement. Cold welding is valued because its use does not require any equipment and can be used in any conditions, even field ones. In addition, when using the composition, you do not need to heat anything.

Application area

The composition can be used to connect almost any materials:

• it is possible to bond homogeneous and many dissimilar metals to each other almost without exception;
• all plastics except polyethylene can be repaired;
• any ceramics, porcelain and all glass are perfectly bonded with this type of glue;
• Carpets and linoleum are perfectly glued directly to the floor surface or end-to-end.

The adhesive composition can be used to seal holes, holes, cracks, joints of very different elements and parts made of dissimilar materials. For example, plastic and metal stick well, as do wood and glass, etc.

In addition to the minimum set of tools and materials, they recommend that motorists also have tubes of adhesive.

The question arises: can cold welding be used when repairing plumbing fixtures? Yes, practice has shown that this work can be carried out even without draining water from water supply and heating pipes. This quality allows you to save time and repair costs. And the resulting patches can easily serve until the end of the heating season.

Of course, to be honest, a seam using glue is inferior in strength to a seam made by conventional welding. Therefore, in case of serious damage, it is better to turn to traditional welding.

Information about welding linoleum.

Read what tool a home craftsman needs.

Pros and cons of the method

The advantage of cold welding is its safe, environmentally friendly adhesive composition, which does not contain toxic substances and does not affect the human respiratory tract.

Unlike natural welding, the method has many advantages:

• it does not require special welding skills, special tools and equipment;
• there is no heating or deformation of adjacent areas during operation, and there are no harmful emissions or unpleasant odors, which allows the method to be used in any room;
• the seam almost always turns out neat without bumps and sagging, especially since the seam can be sanded with abrasive materials after hardening. The seam is not destroyed when exposed to chemicals;
• there is no metal waste and other debris (electrode cinders) after completion of work;
• universality of the method - the scope of application is very wide, the adhesive composition is affordable;
• When connecting explosives or soft materials, this is the only option.

The downside is the risk of glue particles getting into the digestive tract when sanding or drilling a hardened surface. To avoid this trouble, you need to use glasses and a mask during these operations.

how to use cold metal welding correctly

How to use cold metal welding correctly

The composition of cold glue for car repairs quickly hardens without reacting with flammable substances (gasoline, motor oil), forming a fairly strong adhesion to metals.

Varieties of cold welding methods

1. Spot welding. It is good for joining soft metals (copper, aluminum, brass). This method is used to attach a handle to a saucepan, or glue aluminum wires to a copper plate to increase the reliability of contacts.
2. Butt welding. It is often used to securely connect electrical wires and cables.
3. Seam welding. It is used to obtain the tightness of closed elements such as a vessel or device body.
4. T-welding. It is used on transformer windings with aluminum leads to attach them to brass studs.
5. Shear connections are used to connect heating, sewer and water pipes.

cold welding auto

Sequence of work

To get a good result from cold welding, you must follow certain rules.

1. First you should prepare the surface well. To do this, it must be cleaned of dirt, paint and varnish removed.
2. A very smooth surface should be treated with sandpaper to make the adhesion stronger.
3. Now you need to degrease it using acetone, alcohol or any other solvent. There are compounds applied to oily surfaces, but degreasing increases the reliability of the connections.
4. When using a 2-component composition, first read the instructions and find out how long the glue lasts. Combine the contents of the tubes in a certain proportion until a uniform color is obtained and apply to the desired location using a rubber spatula.
5. Hard glue must be kneaded well to a certain temperature so that it becomes elastic, distributed at the joint and pressed for several minutes.
6. To repair leaking pipes, it is necessary to use a special compound used on damp surfaces. The weld applied to the pipes is fixed with tape or a plumber's bandage.
7. After the glue has dried, the resulting seam can be sanded.

I hope you now know how to use cold welding correctly and will definitely use this method if necessary. Just remember that in some cases this is a temporary measure, do not lose sight of the repaired items and replace them in a timely manner.

You may be interested in learning about glue - liquid nails.

Source: https://remontuzel.ru/nev/kak-pravilno-polzovatsya-holodnoj-svarkoj

How to use dry welding – Machine tools, welding, metalworking

When a person first hears about the extraordinary possibilities of cold welding, his reaction is almost Stanislavskian - “I don’t believe it!”, and in principle, this is understandable.

In part, this perception is a consequence of the name itself, which is a rather successful marketing decision.

Everyone saw how the connection of steel pipes takes place: blinding, mesmerizing sparks scattered in different directions, and even as a child my mother strictly forbade me to look there: “It will hurt my eyes!”

• Types of cold welding
• Properties and capabilities of the method
• Expert advice

Let's be clear that this process has nothing in common with traditional welding; the term “gluing” . This statement is based on the fact that the basis of the composition is epoxy resin . To impart the necessary qualities, various components are added to it. Manufacturers keep information about the most important ingredients secret - competition in the market forces it.

To increase the strength of the connection between parts, various fillers are used. Depending on the characteristics of the surfaces being welded, fine metal filings, ceramics crushed to dust, and cellulose are used. Information about the quantitative content of steel or cast iron filler allows us to indirectly judge the heat resistance of the product: the more, the higher it will be.

According to consistency they are distinguished:

1. Liquid welding for metal - when the epoxy resin and hardener are in separate tubes. If necessary, the contents in the required quantity are used, and the remainder will still serve - without loss of quality, but taking into account the requirements for storage conditions and shelf life. The use of reinforcing mesh increases the strength of the connection.
2. Plastic or dry welding for metal - when the original packaging contains a rod of two layers of different colors. The required amount is cut off, and the resulting “stump” is kneaded in the hands like plasticine, and then applied to the prepared surface. The remainder of the rod must be protected from contact with air and heat, otherwise it will lose its valuable qualities.

Attention!

In both options, the speed of use of the prepared mixture is important. It begins to harden within three, or at most ten minutes, so do all the preparatory work in advance! It is important to ensure a tight, tight fit of the mass to the surface. Each brand has an individual drying time specified in the instructions.

Properties and capabilities of the method

Experts say that the resulting joint is not as strong as classic welding, but stronger than something that is formed when using epoxy for gluing. This feature determines the scope of cold welding and, to a certain extent, restrains the enthusiasm of its supporters.

The fact is that in this way it is possible to reconstruct those parts and structural elements that are not subject to force, that is, they are not load-bearing.

Another nuance that also has to be taken into account is that the seam, made of a very plastic material, becomes rigid after final drying.

Initially, a method was developed for quick and at the same time reliable repair of cars. Now the scope of application of the new method has expanded significantly:

• cars: to restore cracked bodies, gas tanks, mufflers, radiators - both in the workshop and on the road;
• plumbing: for repairing pipes, pumps, fittings and so on, a special composition for working under water is also commercially produced;
• for sealing metal-plastic windows;
• for joining different metals together, for example, aluminum with copper or brass;
• used in the repair of gas equipment;
• suitable for restoration of ceramic products for non-food purposes;
• Suitable for gluing floor coverings overlapping, end-to-end, to concrete.

The specifics of each specific case of breakdown require an individual approach. To accomplish the task, different types of welding are used: seam, spot, butt, T, and offset.

Sometimes there are negative reviews: we tried, nothing worked. If you look into the reasons for such statements in detail, it most often turns out that the performer committed violations: he decided to use cold welding for metal, and did not read the instructions for use. Or he hurried and ignored it, considering the fundamentally important recommendation unnecessary.

Expert advice

1. Use the purchased profile welding strictly for its intended purpose. What works well for joining metal may not work if you want to glue wood or plastic. Waterproof or high temperature options also cannot be fully replaced.
2. Universal welding will help out in many cases, but its properties are inferior to specialized compounds.
3. To guarantee the quality of the repair, be sure to prepare the area where you will apply the adhesive mixture: thoroughly clean the metal of paint, rust, grease and moisture.
4. Follow the instructions exactly and consistently.

Have you already used this amazing invention? Congratulations, there is a reason to celebrate Welder Day with a clear conscience on the last Sunday in May!

Source: https://stanki-info.com/suhaya-svarka-kak-polzovatsya/