What are Uoni electrodes used for?

SSNI electrodes: their properties and characteristics, scope of application, pros and cons

The electrodes that will be discussed can easily be found in many retail outlets. Sellers prefer SSSI among all similar products.

There is more than one type of this brand; there are separate versions specialized for different metals.

What is the difference between these varieties? How to store them? We will answer these questions.

general information

If you need a high level of seam quality when performing manual arc welding, then UONI electrodes are suitable for you.

In order to perform a truly high-quality seam using RDS technology, extensive experience is required, both in the work itself and in the selection of electrodes. Any master will tell you this.

The SSSI brand will easily serve you while you study and gain experience.

What is the difference from other brands? For good operation, you need to set the polarity reversed, then use direct current. The welding temperature is not that important.

The next difference is that SSSI are intended for those people who have been practicing welding for several days. Complete beginners who have been welding relatively recently will not be able to make a good weld the first time.

You need to objectively assess your level of preparation so that there are no problems later.

The rods also differ in their diameter. The most popular among consumers are diameters of three and four millimeters. You will weld most parts with these types.

Those who use the SSSI brand may have noticed that there are several numerical designations. For example, 13/45 or 13/55. What is the difference? Their structure is quite similar, actually.

Only each of them is intended for a different metal. We'll talk more about this in the next chapter.

Varieties

There are four types of SSNI electrodes:

Model 13/45 is used for steel parts. At the same time, the composition of the steel is not so important; it can be anything. You can work with casting using these electrodes.

The seams that are obtained when working with this electrode are very durable and ductile. The composition includes elements such as molybdenum and nickel. Not every species can boast of this.

Electrode 13/55 is designed for welding low-alloy, high-carbon steel. The spatial position for cooking can be any. The exception is the top-down position.

The arc burns unsteadily due to the base coating. But the seam still turns out to be of high quality and stands out for its resistance to cracks.

13/65 will be useful to you for more responsible work. Therefore, it is not advisable for beginners to work with it. Just like the previous one, you can cook with it in any spatial position.

And the quality of the seam stands out for its highest quality among other models.

UONI 13/85 is justified only for ultra-strong alloy steel. Apart from this, this modification has no differences. You can work in any spatial position.

Storage

A high level of quality of seams depends not only on the electrodes themselves and the experience of the master in welding metal. The ability to store rods also plays an important role.

To store electrodes, it is necessary to equip a separate room in which the instrument can be kept for a long time. An important condition for such a room is dry air.

The temperature must be kept at a stable level. A more acceptable value is 15 degrees. For such conditions, an air conditioning system is usually used.

If you plan to store in a basement or garage, take care of waterproofing. Excess moisture can damage the electrodes. Such conditions can be difficult to create at home. How can you save on storage?

Try to always keep the electrodes in a heated room. If storage takes place in a garage, then it is advisable to take the electrodes into the house for the winter. The warehouse should always be dark and dry.

Clear out the top shelves of the closet or the mezzanine for these purposes. If it is possible to install heating in the garage, then it is worth putting the tools in a special case. It can be made at home by taking an appropriate plastic pipe.

It is strictly forbidden to store on the ground or in the grass. It doesn't matter whether they are stored in a box or lying outside. A box is not a good place to store it. She is fragile and unreliable. The packaging can only be used for transportation.

If the rods are saturated with moisture, it is necessary to calcinate them using an electric oven and keep them in this state for one hour. Have the electrodes started to crumble? There's nothing you can do about it. Remember the storage rules and follow them carefully.

Results and conclusions

That's all. We haven't talked about everything. For example, how the electrodes are welded and deciphered. But these are big topics that deserve separate articles.

We have provided only basic information about SSSI products to make it easier for you to select the rods you need. Don't forget to ask for all the necessary documentation when you select tools.

What do you know about UONI brand electrodes? Have you ever used them? What models have you worked with? Share these stories in the comments. Productivity at work!

Source: https://prosvarku.info/elektrody/elektrody-ot-uoni

Welding electrodes UONI 13 55

Professional manual electric arc welding requires the use of highly specialized types of electrode products to solve special problems associated with joining metals and special steels.

The conditions for the construction of modern structures, both industrial and civil construction, require the use of highly efficient and unpretentious electrodes for welding.

One of such universal types of electric welding electrodes is the UONI 13 brand and its modifications, including UONI 13 55 electrodes.

Compared with other electrodes in mass production, the UONI 13 55 brand has a number of advantages that are widely developed and used in construction. Thus, for the construction of multi-storey high-rise buildings using monolithic frame technology, a large role is given to reinforced concrete structures mounted on a reinforcing frame directly at the construction site. And here you cannot do without a universal electrode that meets the most important requirements of such construction:

• ability to use for structures made of carbon and alloy steels and alloys;
• high mechanical strength of the connecting seam;
• plasticity and toughness of the metal of the welded joint;
• ability to work with unprepared surfaces;
• universality of the spatial position of the suture.

Electrodes UONI 13 55 main purpose

For this type of welding electrodes for electric arc welding, the main application is focused on joining most types of steels, including high-carbon types and types containing a small amount of carbon in their composition in structural and withstanding large types of loads.

The weld seam formed by UONI 13 55, among other things, has an increased viscosity of the metal with its plasticity, which provides excellent properties of the weld seam experiencing different types of deformation loads.

These properties of the seams are preserved regardless of the position in which the connection is applied, upper, lower, vertical or inclined; all these positions equally form a strong connection.

The versatility of this brand of electrode characterizes it as compatible with transformer welding alternating current, and with an inverter with direct welding current. The only feature of UONI 13 55 is the need to work in reverse polarity when connecting the welding device.

Features of working with electrodes of the UONI 13 55 brand

The versatility of the spatial position of the weld for this type of electrode is achieved by using a special type of coating and a special composition of the metal core. Thus, when forming a layer of metal deposited on the joint surface, grade UONI 13 55 must have the maximum content of the following components in the weld metal:

• carbon – no more than 0.1%;
• manganese – permissible amount not more than 0.9%;
• silicon components up to 0.37%;
• maximum permissible amount of sulfur 0.3%;
• phosphorus, not more than 0.027%.

During the welding process, the weld pool is formed in a small cloud of shielding gas, this leads to the fact that the seam is formed with very high plasticity. It is relatively easy to form, but when cooled it has the property of high impact strength. A deep, homogeneous connection that does not contain holes and cracks has a longer aging process and the formation of mechanical and corrosion damage.

Working with electrodes of the UONI 13 55 brand requires compliance with some specific features, which significantly improve the quality of the welded joint and ease of use - the initial ignition of the arc is easy, subsequent ignitions do not require additional effort and are carried out with a stable, powerful welding arc.

However, such convenience of working with this type of welding electrodes is achieved primarily by preparing the electrodes by calcination. For 60 minutes, the electrodes are calcined at a temperature of about 320 degrees.

Such preparation for use allows you to obtain a tool ready for work, while the temperature directly during operation does not play a special role, the weld pool is formed correctly, and the metal practically does not form spatter. As a result, calcined electrodes do not form a slag layer of heterogeneous composition; it is separated easily, in large fragments.

Scope of application

The versatility of use and excellent quality of connection results allow the use of welding electrodes UONI 13 55 in places of critical work that require reliable connection and at the same time ease of use:

• welding of reinforcing frame of reinforced concrete products;
• pipeline repair work;
• sealing tank ruptures;
•  elimination of cracks without a through metal defect;
• installation work of critical load-bearing structures
• deposition of a metal layer.

Calculation of the use of welding electrodes of this brand, the characteristics of the connections of which allow one to take into account the tensile strength of more than 490 N/mm2, makes them indispensable for stressed structural elements. And the impact strength of the formed seam in calculations is determined as 127.4 J/cm2.

In many ways, the efficiency of work is determined by the correspondence of the welding current to the diameter of the electrode and the plane in which the welded seam will be located. The magnitude of the current also affects other indicators, for example, the speed of metal deposition and the consumption of electrodes for this operation. So, to surfacing 1 kg of connecting weld at normal air temperature, you will need 1.65 kg of electrodes of this brand, and the yield of deposited metal will be about 93% of the mass of the rods.

The smallest diameter produced by the electrode industry UONI 13 55 is a rod diameter of 2 mm, then the dimensions are as follows - 2.5 mm, 3 mm, 4 mm, 5 mm and 6 mm. The length varies from 300 mm to 450 mm, the dimensional increment is 50 mm.

The practical application of UONI 13 55 electrodes depends on the diameter and position of the weld. For diameters 2 - 2.5 - 3 and 4 mm, all three positions are used, but for 5 and 6 mm this is basically only the lower and vertical position of the seams.

The welding current for work in the lower position is slightly higher than for other types. Thus, for vertical and ceiling types of welding work with electrodes of this brand, a welding current of 130 to 160 amperes is applicable, but for the lower position it is determined from 160 to 190 amperes for electrodes with a diameter of 4 mm.

Source: https://svarkagid.com/svarochnye-jelektrody-uoni-13-55/

Welding electrodes UONI: features, characteristics, use

The modern market offers a wide selection of different products for welding - from welding machines of various designs and operating principles to consumables. Such an assortment is justified, first of all, by the desire to make the result of the work of the highest possible quality, regardless of the materials used and the working conditions of the specialist.

Among all this variety, UONI welding electrodes stand out in great demand, as they are used in the most common method of work - manual arc welding.

Name meaning

The name UONI-13 is nothing more than an abbreviation of the enterprise that developed the coating of electrodes and released the products into wide production. Its decoding is “Universal coating of Research Institute No. 13.”

For a modern consumer, such labeling may look quite strange, but the invention was launched to the masses back in the 1940s in the USSR. It turned out to be so successful that, with minor changes, it is still used today.

The changes, for the most part, affected only the standards regulating production.

Uoni or uoni?

On sale you can find products with both labeling options. In fact, they have the same purpose, but differ significantly in price and quality. What is the reason for this unusual situation?

Returning to the question of the state standards used, it is worth noting that the main document in this case is GOST 9466-75. Both of the above types of products fully comply with it, however, UONII electrodes undergo additional certification by NAKS.

NAKS is the National Welding Control Agency, which has developed and issued additional guidance documents - RD 03-613-03. They can be considered a full-fledged addition to the existing GOST, which significantly tightens the requirements for the use of welding materials.

Thus, despite compliance with GOST, UONI 13 electrodes are of lower quality than products marked UONII, and, as a result, do not give such an outstanding result during operation.

You can distinguish products by the markings on the box.

Brands and usage

All UONI electrodes are used for manual arc welding, but are divided into several brands, differing in marking and purpose:

• UONI 13/45 electrodes are used for welding forgings and cast parts, as they provide good toughness and ductility of the weld. The coating contains nickel and molybdenum.
• 13/55 contain phosphorus, silicon, carbon, sulfur and manganese and are mainly used for assembling rolled products and parts made of low-alloy and high-carbon steels. The weld they form is characterized by high strength and resistance to cracking. A distinctive feature is that they do not work upside down.
• 13/65 are the most universal grade, allowing a wide range of work on welding steel structures, ensuring a fairly high quality of the seam. They work in all spatial positions.
• 13/85 are used for work involving parts made of high-strength alloy steel. They work perfectly in all positions and provide an extremely strong connection, which is why they are used when installing critical structures.

General benefits

In general, UONI-13 electrodes, despite certain differences between brands, have a number of significant advantages.

• they perform well when working in subzero temperatures,
• provide a tight seam with good mechanical characteristics,
• the connection formed is well resistant to vibrations, shock loads and temperature changes,
• the electrodes themselves ensure easy initial ignition and stable arc burning,
• with highly qualified workers, metal spattering is minimized,
• The slag crust is easily cleaned off from the resulting seam.

All these advantages make them one of the most convenient and efficient to use, which justifies their high popularity.

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Advantages of working with us An order for any metal will be delivered on the day of the order if your order is received before 12:00 Deferred payment to our regular customers We assemble the entire created order into one machine Quality certificates for all our metal We provide professional advice on selection Metal shipment 24/7 (24 hours a day, seven days a week) We will carry out rough processing, cutting to size, cutting metal, galvanizing pipes, meshes. We will unwind rolls, unwind cold and cold rolls and OC rolls, longitudinal and transverse cutting. We will produce, pipe blanks up to 2 meters, plates, gussets. We will do it, non-standard operations for bending channels and other rolled products in a short time Wide range available in stock Any type of product can be purchased from us starting from one piece Fast delivery 7 days a week throughout Russia Entry passes to the Third Transport Ring and the Garden Ring

Source: https://stvybor.ru/staty/241-uoni-welding-electrodes/

Electrodes UONI 13/55 - technical characteristics and explanation

/ Welding /  

Uoni 13 55 electrodes are ideal for the arc welding process and important parts made of carbon-containing and low-alloy metals, in particular those used in low-temperature areas. This type of product has proven itself to be excellent when connecting serious metal structures, where it is necessary for the weld to have a high level of ductility and impact toughness.

What are SSNI electrodes?

There are more than enough tools for welding work on the market. For a quality connection, it is necessary to use time-tested material. When purchasing, you should study the coating composition, melting coefficient, and welding consumption.

UONI electrodes belong to the coated class consumables; the operating principle consists of melting metal and a rod, which subsequently connects the product. The rod consists of the alloying metals magnesium, chromium or nickel.

Electrode coating UONI 13/55 is used to create a protective pool from air during welding work.

SSSI electrodes

When air gets into the weld pool, a poor-quality seam and the formation of oxides are possible. Coating of fusion elements is applicable to welding steel with low levels of alloying elements, carbonaceous metals.

Such materials are used to create load-bearing structures and durable connections. The melting temperature ranges from -60 to +40 degrees, the consumption per kilogram of molten metal is 1.7 kg of product.

The decoding of the name SSSI comes from the domestic name of the welding institute, as a universal coating of scientific institute number 13.

: Stainless steel electrodes - marking elements for welding

Request for the supply of electrodes (drop-down)

GOST 9466-75, GOST 9467-75TU 1272-002-11040008-2001

E50A – UONI-13/55 – Ø – UD

E 515 – B 20

Purpose

UONI-13/55 electrodes with a basic coating are intended for manual electric arc welding of especially critical structures made of low-carbon, medium-carbon and low-alloy steels operating under alternating loads and negative temperatures down to -50 ° C. The electrode rod is wire grade Sv-08A GOST 2246-70.

They are used for structures and pipelines that require increased characteristics of ductility and impact strength of the weld. Widely used in bridge construction. They provide excellent protection of the weld pool, which is important when working in open spaces. They have stable technical characteristics. They have proven themselves when working in northern conditions.

The electrodes have a NAKS certificate (group of basic materials - 1 (M01); groups of technical devices - MO, PTO, KO, GO, NGDO, OKHNVP, OTOG, SK, KSM), certificate of the Russian River Register (RRR), registered in the voluntary certification system GOST R.

Features of application

Each of the melting elements has its own niche of application; USI electrodes are used with the following parameters:

• The welding process occurs using reverse polarity current; the process is required by GOST.
• The seam eliminates the presence of gases and excess impurities by using a special coating of fluoride formations and various carbonates.
• The metal of the rod is used from low carbon steel compounds, which contributes to the reliability of the weld.
• Thanks to organic compounds, welding electrodes UONI 13/55 have low susceptibility to moisture.
• The design, made of low-alloy materials, avoids cracks and irregularities during the welding process.

Welding using UONI electrodes

The seam is not subject to aging or loss of fastening properties when exposed to temperature. Welding with UUNI electrodes should exclude the use of poorly cleaned materials, as they may be subject to corrosion in the future. The process occurs with a short arc, which avoids loss of connection quality. The main advantage over competitors is the result with the required hydrogen concentration, a connection resistant to the appearance of microcracks.

The chemical composition of materials and technology of use may vary depending on the manufacturer. Before purchasing, you need to inquire about compliance with the requirements and standards according to GOST, or the availability of a certificate of certification of welding materials.

Application of electrode welding in construction

Calcination procedure for welding electrodes UONI 13/55

To reduce the concentration of moisture and other unnecessary compounds in the coating - calcination by keeping it in an induction furnace. Each manufacturer of UONI 13/55 electrodes includes instructions for use and calcination of materials in the packaging. Neglecting the instructions is strictly prohibited, as this will result in a poor-quality connection.

Electrode welding principle

In situations where the instructions are not included or are damaged, it is necessary to follow the basic sequence of steps for calcination:

• The procedure is carried out immediately before use in the welding process. These actions are necessary for a high-quality result, a reliable seam and a stable burning of the welding arc.
• The maximum effect of calcination is 8 hours; if, after a specified period, the materials have not been used, the procedure is repeated again.
• The calcination time should not exceed four hours, and the permissible number of calcinations of the same UUSNI electrode is 3 times.
• The process uses a furnace heated to 250-280 degrees; for a uniform result, special molds are used, only then the melting elements are effectively calcined.

Storage conditions

Obtaining a high-quality result depends on the duration and storage conditions of the materials. Storage takes place in rooms with relative humidity up to 50%, without interacting with direct sunlight, air temperature of at least 12 degrees. Subject to all rules, standards and storage conditions of GOST 9466-75, the shelf life of materials can be unlimited.

Download GOST 9466-75

Electrode storage

Special properties

When using UONI-13/55, the weld metal is characterized by high resistance to the formation of crystallization cracks and low hydrogen content.

High quality is confirmed by regular independent testing of the welding and technological properties of welding materials.

General characteristics of UONI 13/5 electrodes

General characteristics of electrodes include the following parameters:

• coating of welding electrodes: basic;
• deposition factor, g/A•h: 9.5;
• electrode surfacing productivity (for diameter 4.0 mm), kg/h: 1.4;
• consumption of electrodes per 1 kg of deposited metal, kg: 1.7.

TECHNICAL DATA OF ELECTRODE UONI-13/55

Reference information on welding electrodes UONI-13/55 and their modifications. UONI-13/55 electrodes and UONI 13/55SM electrodes are intended for: welding carbon and low-alloy steels.

The main purpose of welding electrodes. Electrodes of the UONI-13/55 brand and electrodes of the UONI-13/55SM brand are intended for manual arc welding of particularly critical metal structures made of carbon and low-alloy steels, when increased demands are placed on the metal of the welded seams in terms of ductility and impact toughness. Welding in all spatial positions, except vertical from top to bottom, with direct current of reverse polarity.

GOST 9466-75	AWS A5.1: E7015
GOST 9467-75	DIN E5140B10
TU U 05416923.015-96	ISO 2560: E514B26
TU 1272-036-48265127-2009

Source: https://tpspribor.ru/svarka/elektrody-uoni-13-55-tehnicheskie-harakteristiki-i-rasshifrovka.html

How are MR electrodes different from SSNI electrodes?

A welding electrode is a rod made of metal or other material that conducts electricity. It is designed to conduct current to the workpiece being welded. Today there are many different types of them. Most of the products on the market are required for manual arc welding.

There are two types of welding electrodes: consumable and non-consumable. The latter are made from a refractory material (tungsten). Meltable ones are made from welding wire. A special coating is applied to the metal rod to protect it from atmospheric pressure.

Differences between welding electrodes

Electrodes have many differences depending on the brand and subspecies to which they belong. This tool is suitable for welding steels with a carbon content of up to 1/4 percent. They are also used when welding low-alloy steel. The difference between the electrodes is visible in many parameters, for example, in the tendency to pore formation, in the way the weld seam is located or in what its surface is covered with: basic, cellulose, etc.

In this article we will consider the features and possible differences between rutile MR electrodes and rods with the main coating -UONI.

MR electrodes

This type of equipment is used when joining carbon steels. For example, MP-3 is often used if it is necessary to carry out installation work on a critical structure. MR electrodes differ from SSNI in that they can be used to weld in conditions of high humidity. Even rusty and poorly purified metals are sold for welding. Long arc welding is possible.

The most popular brand of this type is MP-3 electrodes. With them it is possible to install critical structures, as they guarantee a very reliable seam. They can be used when working with connections made of carbon steel and low-alloy steel. It is possible to work with any current with reverse polarity. Welding can be done in any position, excluding vertical. We recommend! Technical characteristics of welding electrodes ANO-4

The area in which MR electrodes are most often used is the welding of pipelines supplying hot water or steam, as well as pipes carrying oil and fuel oil. Electrodes of this group can be used for welding, which is provided by conventional household welding current sources.

SSSI electrodes

This type of welding equipment is used in circumstances where the structure being welded must be as shockproof as possible. They are used for the installation of very important structures, since when they are used, the welds are of high quality and ductility.

One of the main advantages of SSSI is that the welds obtained during the work process can withstand very low temperatures (down to -40).

Welding work can be carried out in various positions. All representatives of this species are distinguished by the presence of a base coating. The most commonly used are SSSI 13/45 and SSSI 13/55.

UONI 13/55 is applicable for installation work on structures that require the ability to withstand high dynamic loads. They are also used to produce seams that are resistant to low temperatures. UONI 13/55 can weld thick metals together. Their use is possible in the construction of ships and the installation of tanks and vessels under high pressure.

UONI 13/45 is used for working in cold weather. When working with them, it is necessary to take into account that the surfaces for welding must be very well prepared: cleaned of oils and other contaminants.

How do UONI electrodes differ from MR electrodes?

The main differences between the listed types can be identified:

Electrode type	MR-3	SSSI
Coverage type	Rutile	Basics
Type and polarity of current	Alternating and direct current of any polarity	Constant reverse polarity
Working conditions	It is not necessary to clean the surfaces before welding	Surface cleaning is required
Can work in wet conditions	The coating is sensitive to moisture

We recommend! Technical characteristics of Kobelko LB 52U electrodes

Thus, the difference between the electrodes of the UUSI and the MR is visible. Each of these types is individual and suitable for certain jobs. It’s up to you to decide which one to choose: UON or MP3, depending on your needs and goals.

Source: https://svarkagid.ru/elektrody/otlichie-elektrodov-uoni-ot-mr.html

Technical characteristics of electrodes UONI 13/55. Welding technology

UONI 13/55 electrodes receive only positive reviews among professional welders. And beginners are afraid to use these capricious rods.

Which are used for structures, pipelines made of low-alloy and carbon steel, requiring increased characteristics of ductility and toughness of the weld. In harsh climatic zones.

Technical characteristics of welding electrodes UONI-13/55

Consider:

1. General characteristics;
2. mechanical and chemical properties of the weld;
3. permissible seam position;
4. welding current values;
5. weight and number of electrodes in one pack;
6. cost of one pack.

1) General technical characteristics:

• type of connection - arc, manual, direct current of reverse polarity;
• coating (coating) - basic;
• the rod is made of Sv-08 or Sv-08A wire;
• surfacing coefficient - 9 g/Ah;
• consumption of welding rods per 1 kg of deposited metal is 1.6 kg.

2) Mechanical properties:

• temporary resistance, N/mm2 - 420-540;
• relative elongation of at least 22%;
• impact strength, J/cm2 not less than 128.

Mass fraction of chemical elements in the weld seam (table):

3) Spatial positions of the weld. UONI 13/55 electrodes with a diameter of 2 to 4 mm are used for welding in all spatial positions except vertical (top to bottom No. 5).

Watch the video (below) where a man refutes this written rule. Rods with a diameter of 5 mm are used for horizontal, bottom and vertical methods (bottom to top).

personal experience of using SSSI 13/55 in all spatial positions.

4) The magnitude of the welding current. When welding with E50A UONI 13/55 electrodes, the selection of current depending on the diameter of the rods and the position of the weld is presented in the table.

5) The table will help you calculate the number of rods (pieces) in the package and the weight of the electrode in grams.

6) The price for a pack of UONI 13/55 varies from 400 to 750 rubles. The cost varies depending on the weight of the pack, manufacturer, and region. On average, the price per kg of products starts from 100 rubles.

Advantages of using SSSI 13/55:

1. obtaining a strong weld seam;
2. reduction in electrode consumption by 15%;
3. increase in surfacing by 10%.

How to replace UONI 13/55 (analogues):

• Basic One;
• Elga;
• AV-66;
• OK 48.00 and 48.05.

How to cook with UONI 13/55 electrodes

The workpieces prepared for joining are cleaned of oil, scale and dirt. Calcination of UONI 13/55 electrodes is carried out for 1 hour at a temperature of 300°C.

Welding plates. On the outside, the technology is performed on a short arc, with small oscillatory movements (herringbone). Stick sticking during the welding process is scary for beginners. By lengthening the arc we get rid of sticking. Feel the line when to do this and then the SSSI will submit to the home craftsman.

Having boiled one side, turn the part over and slowly, without any oscillatory movements, cook the other side.

UONII 13/55 in pipe welding.

Welding tips:

• find a good manufacturer of electrodes, buy a pack of different manufacturers and try;
• read the instructions on the pack carefully and always pierce the rods before work;
• select and adjust the correct current;
• try to cook using the electrode coating using a short arc.

Source: https://plavitmetall.ru/elektrody/uoni-13-55-texnicheskie-xarakteristiki.html

Electrode UONI | SSSI characteristics| PRICES |UONII-NAKS Pavements

Happy New Year! Increase your health and take care of everything that is dear to you!

      The 30s of the 20th century passed. The country was developing. There is an urgent need for electrodes for welding alloy steels. Electrodes of this kind were not produced in the country and were imported from abroad. The first experimental batches of coated electrodes were developed within the walls of the Leningrad Institute of Metals in 1933 and were called LIM. Due to the absence of ferroalloys (alloying additives) in the coating composition, these electrodes did not ensure the quality of the deposited metal and were used only for welding low-carbon steels. But not much time passed, and already in 1934 M. Kozhevnikov developed electrodes of the VET-26 brand (All-Union Electrotechnical Trust), the coating of which contained ferromanganese, which significantly increased the mechanical properties of the weld metal and the strength of welded joints. Further, scientists already in the period 1935-1937 advanced in research and developed a series of electrodes with acid ore and ilmenite coatings (Orgametal Welding Office). These coatings, in addition to slag-forming, deoxidizing and alloying components, also contained gas-protective organic components. This principle has survived in the recipe to this day. All developed coating compositions contained a significant amount of iron and manganese oxides, which during welding led to active oxidation of the weld metal and the formation of acidic slags. A significant disadvantage of acid ore electrodes is the tendency of the deposited metal to form hot cracks with increasing carbon content and significant burnout of alloying elements. A solution to the difficulties of welding medium-carbon, high-carbon and high-alloy steels was found as a result of the invention of electrodes with basic coatings. The basic basis for this coating was marble-fluorspar (calcium fluoride). The first electrodes with a basic coating were developed by A. Shashkov and T. Dubova in 1937. Their use during the Great Patriotic War found wide application for welding armor steels. However, the most in-depth and successful research, as well as the development of a formulation for electrodes with calcium fluoride coatings, was carried out in 1937-1938. Petranem K.V. (electrodes of brands UONII-13/45 - UONII-13/85). Each brand of these electrodes remains the main one for the corresponding type of electrodes to this day. But the fly in the ointment or the disadvantage of electrodes with calcium fluoride coatings is their applicability for welding only with direct current of reverse polarity due to the low stability of the arc. Later Petran K.V. developed electrodes with basic coatings suitable for welding with alternating current.

     An electrode with a calcium fluorine coating for manual arc welding of low- and medium-alloy carbon steels was assigned the grade UONI-13 (universal coating NII-13). In 1940, copyright certificate No. 65424 was received for the product.

With the use of the new slag system CaF2–CaCO3–SiO2 and the use of a complex of various ferroalloys containing manganese, silicon, titanium, and aluminum for deoxidation and denitrogenation, based on a low-carbon electrode rod in 1939.

a series of electrodes was created that provide the ultimate strength of the deposited metal from 441 to 833 MPa (from UONI 13 45 to UONI-13 85), as well as high plastic properties, impact strength and density. UONIY (as welders affectionately call them) turned out to be a WONDER!

     Today, SSSI electrodes are produced at every serious electrode plant. The SVEL plant, part of the ESAB group, producing UONI electrodes, cannot afford compromises in terms of quality, because its reputation does not allow it. Despite the fact that the type of deposited metal for all UONI electrodes is E50A, but depending on the purpose, they have different mechanical properties of the deposited metal. Electrodes differ depending on the industry: for bridges, for pipelines, for the nuclear industry. How do SSSI electrodes work? The first thing to do is to prepare the edges, i.e. remove rust and oil film. Necessarily ! SSNI electrodes require calcination. This is necessary so that the deposited metal contains less bound hydrogen, which forms foci of corrosion. Welding is carried out by leaning on a short arc due to the “capricious” nature of the electrodes and the inelastic behavior of the electric arc. We offer USI electrodes from the following manufacturers:

1.Electrodes UONII, OK48.00, OK48.04, OK48R produced by ESAB-SVEL (St. Petersburg) 

UONII electrodes produced by ESAB-SVEL are electrodes of uncompromising quality that meet the highest requirements.

2.UONI electrodes Special electrodes are high quality electrodes. Fully comply with GOST.

3. UONI Plasma electrodes produced by PlasmaTek are high quality electrodes with the addition of iron powder to the coating for more productive work.

How much do Uoni electrodes cost? The price is determined by the quality of the materials used - wire, glass, ferrous additives. ESAB enterprises produce their electrodes only from high-quality raw materials, which is why these electrodes are more expensive. Compromises in quality ALWAYS result in negative consequences - monetary losses, man-made disasters, human casualties.

To buy UONI electrodes in bulk at the best price, you must send an application and details to the sales department

Source: https://eko-teh.ru/articles/uoni-istoriya-elektrodov

We perform welding with UONI electrodes

Welding electrodes Uoni 13/55 are designed for performing manual arc welding in any spatial arrangement, excluding vertical - from top to bottom. For welding work, direct current with reverse polarity is used.

Performance characteristics

The consumable material is used when welding especially critical metal structures made of carbon and low-alloy steels, when high demands are placed on the joints in terms of impact strength and ductility.

Welding electrodes of the UONI 13.55 brand provide the opportunity to obtain high-quality welds in different spatial positions using a constant reverse polarity current.

Specifications

• The deposition coefficient is 3.5 g/Ah.
• The surfacing productivity when using a 4 mm thick cathode is 1.4 kg/h.
• For 1 kg of deposited metal, 1.7 km of cathodes are required.

Application benefits

• When using filler material for welding work, cracks do not form on the welds, and the metal has a low carbon content.
• The reliability and operational efficiency of the product is confirmed by a quality certificate.
• The consumable material can be safely used when performing welding work in conditions of unstable electricity supply.

What designs can be welded?

Using UONI electrodes, you can weld the most critical structures made of low-alloy carbon steels, for example grades 48KS 10ХСН2Д. In this case, stringent requirements for impact strength and ductility are imposed on the weld metal. Products made from such material can be used under conditions of alternating loads and low temperatures.

How to work with UONI brand electrodes?

The parts to be welded must first be cleaned of oily, greasy stains, dirt, and scale. The electrode rods are calcined for an hour at 300 degrees.

• Welding is carried out “herringbone” (small oscillatory movements of the filler wire) from the outside with a short electric arc.
• Beginners in welding are usually intimidated by the electrode sticking to the base metal of the structure. This unpleasant incident can be eliminated by lengthening the welding arc. The most important thing is to feel this moment, and then any home craftsman will be able to easily work with UONI 13/55 welding electrodes.
• After welding the plates on one side, the products are carefully turned over, and they are welded on the reverse side, only in this case the seam is made slowly, without oscillatory movements.

Welding tips

• You need to choose a good manufacturer. To do this, it is worth purchasing a pack of electrodes from different manufacturers and testing them in practice.
• It is necessary to carefully study the instructions for use on the packaging.
• Before performing welding work, electrode rods must be calcined.
• You also need to choose the right welding current.
• You need to test the electrode on a short arc, relying on its coating.

Welding low-alloy, carbon steels

Before welding, it is necessary to clean the surfaces of metal samples to be joined and calcinate the electrodes at 300 degrees for an hour. Welding work must be carried out with a constant current of reverse polarity.

Table: welding current values ​​depending on the diameter of the electrode rod and the spatial position of the weld

Weld position Electrode diameter, cm

0,2	0,25	0,3	0,4	0,5
lower	40-50	50-70	80-100	130-160	180-210
vertical	35-55	40-65	70-90	130-140	160-180
ceiling	35-55	40-65	70-90	130-140	–

Recommendations from specialists on the selection of welding technology

• It is better to weld fairly thick structural elements using the bath technology in the lower position of the weld.
• Standard arc welding can be used when joining metal structures made of reinforcement. Welding work can be performed in any spatial position of the seam joint with a short arc using a constant current of reverse polarity.

UONI welding electrodes prefer the use of an inverter, since the rectifier cannot provide a stable arc.

It is better to take electrodes with a smaller diameter - they will heat the welded product less. To cool the metal, it is worth preparing copper pads.

Source: https://electrod.biz/oborudovanie/elec/vyipolnyaem-svarku-elektrodami-uoni.html

SSSI electrodes

Welding work is often performed at enterprises, as well as at home. The complexity of the work depends on the characteristics of the welding machine and other tools used.

For home use, the welding process is not possible without an inverter. Metal melting occurs through the use of melting elements, the quality of which directly determines the work process.

The most common electrodes UONI 13/55 allow you to create strong connections and are capable of welding various grades of metals.

https://www.youtube.com/watch?v=Xt8WOHq6ySk

Electrodes UONI 13/55

Labeling explanations

Various modifications can confuse an inexperienced craftsman when purchasing welding elements. The marking describes the materials acceptable for use, the welding method, and the composition of the rod. For example, it is possible to consider a product under the name E50A-UONI-13/55-4.0-UD.

Explanation of SSSI electrode markings

The capital letter "E" stands for electrode. The process of use is implied by manual arc welding. The following numbers indicate the strength limits of the connection, divided into specific and tensile strength. The letter “A” is affixed to designate the seam as an impact-resistant and ductile connection. The diameter of the SSSI electrode is indicated after the number, which means 4.0.

At the end of the marking there is a designation of the materials to which the welding element is applied.

The letter “U” indicates that this type of electrode is used for carbon steel. There are different steel designations to which welding products are applied:

• T – welding with heat-resistant metals is performed;
• B - used in processes with high-alloy steels;
• H – denotes the process of repair work using material surfacing;
• L - applies to alloy steels.

Contains the designation of the ratio and diameter of the coating to the rod. The letter “D” means a thick coating layer, a thin coating – “M”, the middle one is indicated by the letter “C”. The dimensions of the rod, in particular its length, depend on the diameter.

The thickness of the product is 2 mm, then the length will be no more than 30 cm. In cases with a diameter of 4 mm, the length of the product is 450 mm in accordance with the described standards and GOSTs.

The advantage of UONI 13/55 electrodes is the ability to work with vertical, ceiling and horizontal seams.

Experienced welders advise using different currents for each application, this allows beginners to choose the right setting for a high-quality connection. It is also worth purchasing several sets of boxes from different manufacturers to find the best option. Calcination of the product is a mandatory procedure that should not be neglected; the method of welding with a short arc, relying on a coating, will allow you to quickly master the work.

Source: https://stankiexpert.ru/spravochnik/svarka/elektrody-uoni.html

Description and selection of materials for electrodes of the “UONI-13/55” type

We continue the series of articles devoted to the popular welding electrodes "UONI-13/55". The site contains the following articles;

You will find a lot of interesting and useful information in them. For example, the article “Welding with the “UONI-13/55” electrode” talks about how these electrodes can be used to weld stainless steel parts. Today we will give a description and talk about the choice of materials from which welding electrodes of the “UONI-13/55” type are made.

The coating of welding electrodes “UONI-13/55” is a mixture of powdery materials that are applied to a metal rod. It performs many functions aimed at solving two main problems solved during welding:

• ensuring a stable welding arc;
• imparting the required mechanical properties to the deposited metal of the weld.

Electrode coating in action.

1 - arc, 2 - electrode, 3 - metal to be welded, 4 - weld pool, 5 - drops of molten electrode, 6 - coating, 7 - gas cloud, 8 - slag pool, 9 - welding seam, 10 - slag crust.

Ensuring a stable welding arc of welding electrodes "UONI-13/55"

To increase the stability of the welding arc of the UONI-13/55 electrodes, substances with a low ionization potential are introduced into the electrode coating in small quantities. Thanks to this, the arc space is saturated with ions, which ensure stable arc burning. Such substances include:

• titanium concentrate;
• barium carbonate;
• potash;
• chalk;
• potassium liquid glass and some other components.

Coatings are applied in a thin layer. The result is thinly coated welding electrodes with an ionizing coating “UONI-13/55”.

Device for mixing and dosing loose components of the electrode coating.

Giving the weld metal of welding electrodes “UONI-13/55” the necessary characteristics

To improve the quality of the weld, various components are introduced into the coating composition of the welding electrodes "UONI-13/55". They are designed to solve the following problems:

• protection of the welding zone from hydrogen (as part of water vapor), oxygen and nitrogen contained in the atmosphere. Protection is carried out by creating two barriers:
  • a gas cloud that consists of several gases:
    • carbonic;
    • carbon monoxide and other gases that create the following components: starch, food flour, cellulose, dextrin, etc.;
  • a slag layer of complex composition that floats on the surface of molten metal. Slag-forming components are: quartz sand, manganese ore, titanium concentrate, etc. Slag not only protects the weld pool from harmful gases, but also reduces the rate of its cooling and crystallization of the metal (which is important when welding alloy steels). In addition, it promotes a more complete release of gases and harmful inclusions (impurities) from the melt and prevents an increase in the number of cavities and pores in the body of the weld;
• deoxidation of molten metal. The process involves removing oxygen from it. The most effective method of removal is its binding (deoxidation) with substances that easily (easier than iron) react chemically with it. They are included in the coating in the form of ferroalloys;
• alloying the weld metal. This is done to improve its chemical, physical and mechanical properties. This task is performed by silicon and manganese included in the coating of welding electrodes “UONI-13/55”. Alloying of the seam, in addition, can be carried out with filler wire;
• binding all the components that make up the coating to each other, and the entire coating as a whole to the electrode rod using potassium liquid glass. This binder simultaneously performs the function of stabilizing the welding arc.

The melting temperature of such a coating is in the range of 1100-1200°C, which is optimal for the welding process.

Types of coating for welding electrodes "UONI-13/55"

The thickness and chemical composition of the coating have a major influence on the parameters of the welding process:

• electric arc stability;
• features of the transition of the rod material into the weld pool;
• viscosity of slag and molten metal, etc.

Coating thickness

In accordance with GOST 9466-75 “Coated metal electrodes for manual arc welding of steels and surfacing. Classification and general technical conditions”, the thickness of the welding electrode is estimated by the ratio of the outer diameter of the electrode (D) to the diameter of its rod (d). Depending on the thickness, coatings are divided into the following types:

• thin – D/d < 1.2 – (indicated by the letter “M”);
• average – 1.2 < D/d < 1.45 – (“C”);
• thick – 1.45 < D/d < 1.8 – (“D”);
• especially thick – D/d > 1.8 – (“G”).

Consumable electrode design for welding.

1 – rod, 2 – transition area, 3 – brand of electrode, 4 – coating.

Chemical composition of the coating

Depending on the chemical composition, all coatings are divided into the following types:

• sour – designated “A”;
• main – “B”;
• cellulose – “C”;
• rutile – “R”;
• mixed type - “RB”, “RA”, “RC”, etc.;
• other types of coatings – “P”.

Source: https://WeldElec.com/material-uoni-1355/

Electrodes UONI 13/55: technical characteristics and technology of their use

Welding work often has to be performed not only at some enterprises, but often home craftsmen also take on this difficult task. But the degree of complexity of welding depends on many criteria, for example, the model of the welding machine that the home craftsman uses.

But knowing that electrical networks very often operate unstable, then, accordingly, it is impossible to do without an inverter when welding. But the operation of such a welding machine is impossible if electrodes are not used. They are sold both in packages and individually. But the composition of their cathodes should be chosen based on what kind of steel you are going to connect.

How to choose the right electrodes for welding?

For high-quality operation of a welding machine, electrodes are required, which are produced not only abroad. Now on the shelves of construction stores there is a wide selection of domestically produced welding materials.

When purchasing electrodes, you should consider their following properties:

1. Coating composition.
2. Consumption.
3. Deposition factor.

The cathode plays an important role in the electrode, but there are many other qualities to consider. So, when purchasing it, the following factors are taken into account:

1. Properties.
2. Diameter of the seam to be joined.
3. Penetration depth.

When going to a hardware store to buy electrodes, you should already have an idea of ​​what its purpose will be, that is, what steels it should connect.

Main brands

A welding machine cannot do without electrodes, but the construction world is so diverse and diverse that sometimes the home craftsman is simply lost in what he should choose from the entire list that is offered to him.

But I would like to draw your attention to several brands that are considered the best among all. First of all, these are UONI brand electrodes, which have long proven their quality and the characteristics of which will be discussed a little later.

The second type of electrode is MP3. This brand is very common today. It is most often used to carry out welding work on not the most critical structures , which are made of carbon steels, and they can also be low-alloy.

The main advantage of this electrode is that the electric arc burns continuously, and thus there is uniform penetration of the metal being connected , and therefore the strength of the entire work. To work with this brand, you can use both alternating and direct current.

Another common brand of electrodes is OK 46. They are not only good for the welding process, but also have a coating such as rutile. Therefore, the welding seam turns out to be strong and reliable , because it even allows you to re-ignite the electric arc itself. But not every welding operation can be performed with this cathode, since it is better suited for, for example, tacking metal or creating a root weld.

Technical characteristics of UONI 13/55

Today there are a huge variety of brands of electrodes. Among all, the electrodes of domestic production UONI are distinguished by their greater popularity and performance. This abbreviation means universal coating of a research institute.

So, the UONI brand is intended to carry out any welding work on metal structures with high quality and maintaining a high level of ductility. Such electrodes can be used even in the most severe climatic conditions , where most often normal welding work is impossible.

SSSIs have already been used many times in welding the most serious structures and even initially passed a number of mandatory tests, proving that they help to obtain a welding seam that is both ductile and has the necessary impact strength.

Let us dwell once again in more detail on what the technical parameters of the SSSI electrode are. It has a basic coating and this plays an important role. The deposition rate is 3.5 g/Ah. Its consumption is low, as it is known that the electric motors of the UUSI consume approximately one per kilogram of the metal that is deposited, that is, the figure turns out to be approximately 1.7 kg.

Such electrodes also have their own advantages over others. First of all, the seam is of very high quality. The properties of these seams are such that even crystalline cracks do not form on them , and they also contain a fairly low carbon content.

The best option when working with an electrode is to use short arc welding, which uses the support method. It is simply ideal even for those places where there are problems with energy supply and it is not stable.

Technology of using electrodes UONI 13/55

It is known that there are some peculiarities in the technology of using this electrode. So, its core is a steel wire. The second feature is that the product is coated with a mixture that includes carbonate and fluoride compounds. They affect the quality of the seam, as well as what impurities it will contain.

The UONI 13/55 electrode makes seams so high quality and reliably that there are no complaints about them. This makes it almost impossible to find any irregularities or burrs, or even any swelling or cracks on the surface.

Since there are no organic inclusions in the coating of the electrodes , this allows them to be calcined to a temperature above three hundred degrees, but not more than 450. This property allows us to say that they easily tolerate moisture.

Source: https://stanok.guru/oborudovanie/raznoe/obzor-elektrodov-uoni-13-55-i-ih-tehnicheskie-harakteristiki.html