How to cut correctly with a gas cutter

Cutting metal with a gas cutter: how to use, cut, work, technology

Cutting metal with a gas cutter consists of two main stages:

• at the first stage, the alloy is heated to the required operating temperature. For this purpose, a flame of a burning mixture of gas and oxygen is used;
• in the second, the metal is burned in a stream of oxygen.

How to use a cutting torch: igniting gas and heating metal

Gas cutter brand NORD-S

Before igniting the torch, make sure that all connections in the fittings are tight.

Next, the acetylene valve on the cutter is opened and oxygen is allowed to escape from the mixing chamber. When you can hear that acetylene is slowly coming out, tighten the valve. The burner is ignited with a special tool.

Lighters

The lighter should be positioned in front of the nozzle so that its inside touches the mouthpiece. The lighter creates sparks that ignite the acetylene.

A small yellow flame forms in front of the mouthpiece. Using the gas supply valve, we increase the flame length to approximately 250 mm. We make sure that the torch starts at the mouthpiece itself.

If the fire “jumps” or breaks away from it, then reduce the gas supply.

Smoothly open the front oxygen valve. It is necessary to supply the amount of oxygen that is necessary for complete combustion of acetylene. When this happens, the fire will change its color from yellow to blue. After this, the oxygen supply should be increased until the inner tongue of the blue flame decreases and contracts.

We continue to open the oxygen valve and increase the size of the torch until the length of its internal flame becomes slightly larger than the thickness of the material being cut. If you hear a sound similar to “sniffling” or notice that the blue flame has become unstable, then you should reduce the oxygen supply. It is reduced until the flame becomes stable and a clear cone forms inside.

The cutter is brought to the workpiece so that the inner flame touches its surface with the very tip. Heating is continued until a “puddle” of molten metal has formed at the point of contact. The tip of the flame should be kept motionless at a distance of 10 mm from this “puddle”.

Gas cutting for metal: shortened and lever from Nord-S

How to cut with a gas cutter (technology)

We gradually increase the oxygen stream, which ignites the molten metal. If a violent process begins and the steel catches fire, then you can gradually increase the oxygen pressure (until the fire cuts through the material). If the reaction has not started (the metal is not heated), then oxygen should be added and heated.

We started cutting the metal and slowly moved along the cutting line. All processing products are blown away to the rear of the cutting area. If this flow slows down or returns, then reduce the cutting speed or stop and warm up the material.

Source: https://kovka-svarka.net/2016/10/rezk-metal-gazov-rezakom/

Oxygen-propane cutter

The process of dismantling metal structures will require the use of specialized tools. The preparation of parts is carried out by cutting; for this purpose, metal cutting is used both with a gas installation of propane-oxygen type and with other devices.

Mechanical devices are suitable for processing structures of small thickness; thick sheets are processed with a gas cutter. The operating principle of the installation is the same, regardless of the design.

Various technical specifications are described on how to use the mechanism correctly; it is necessary to comply with safety requirements and other features.

Oxygen-propane cutter

Operating principle and types

The principle of operation is based on supplying a pure stream of oxygen through the nozzle of a gas cutter. Regardless of the design features of the autogen, execution occurs due to the combustion of metal under the influence of a propane-oxygen environment. The main requirement for using the device is that the combustion temperature must be higher than melting, otherwise the material will melt and drain, which interferes with high-quality work.

Most steel alloys are not susceptible to the action of an oxygen-propane cutter, due to restrictions on the maximum proportion of alloyed impurities. The presence of carbon in the element can lead to unstable functioning or stop the process. The impact on metal occurs in several steps:

• The temperature rises to the point where the steel begins to burn. To obtain the required flame, pure ozone is mixed with the combustible mixture in the required proportions.
• After the zone is heated, both the heated steel is oxidized by the oxygen environment and materials are released from the processing area.

The classification of hand cutters is divided according to several parameters, depending on the type of work. Main characteristics:

• a type of flammable gas, methane, propane - butane, acetylene and others are used;
• power, parameter for obtaining a mixture for heating;
• The nozzle design, which affects the production of gas, is used both with injection systems and without injection.

Injection cutter-burner

Power is divided into several types, from low to high cutting power.

With low power, products with a thickness of 3 to 100 mm are affected; with the medium type of installation, it is possible to cut materials up to 200 mm thick, and with high power – 300 mm.

There are varieties capable of processing products up to 500 mm thick; such installations are used both in industry and in domestic settings. Some components of the characteristics depend not only on the power, but also on the design of the cutting torch.

Design

The most common type of device used in machining steel structures is the double-tube injection cutter. The combustible mixture is divided into several streams, which allows you to adjust the flame power to suit the work. The adjustment mechanism is located on the outer part of the body; there are lever-type devices.

The flow moves through the tube to the tip through the head, releasing at high speed through the central nozzle. The mouthpiece is responsible for the main functionality of the cutter, the cutting part of the process. Part of the gas is transferred to the injector, which, when released under high pressure, creates a vacuum, thereby connecting the combustible mixture. The mixing process determines the equalization of the flow rate by which the action is performed.

The formation of the mixture is carried out by the head of the tip, into which it enters through the lower tube. A torch is formed between the outer and inner mouthpiece, as a result of the formation of a flammable mixture. The two-channel system is equipped with control valves that allow you to adjust the supply of both oxygen and auxiliary gas to the injector.

Cutting torch design

The design without an injection type is more complex, since there are tubes for two flows of oxygen and separately for gas. The mixture of the flammable composition occurs directly inside the head; this design is considered safer. Operations will require higher supply pressures of both oxygen and flammable gases.

The dimensions of the cutters are fixed by GOST standards; for production with small parts, P1 models with a total length of no more than 50 cm are used. More powerful designs are produced longer in shape, there are specific elongated designs designed to perform tasks with difficult access to the cutting site.

The gas burner is designed for cutting products in production conditions, with a large volume of tasks. Before using the device, it is important to understand what key features metal cutting with propane and oxygen has:

1. The mechanism of action is convenient when making curved cutting lines. Stable power allows you to separate metal products of various thicknesses into parts. In situations where it is impossible to use a tool such as an angle grinder, a gas torch is used. The task of making a round product or a blind hole is performed with a gas torch without requiring much effort.
2. A gas cutter has an advantage over gasoline models. In addition to being lightweight, the mechanism does not produce excessive noise during operation and is also compact.
3. The use of a device based on the influence of flammable gas makes it possible to double the speed of execution, which is beyond the power of mechanical tools.
4. Propane, as a liquid gas, has a low price. Therefore, it is used not only when processing products for production needs, but also when recycling metal and other activities.
5. The use of propane as a flammable mixture allows for high-quality cutting. Cutting is carried out along a narrow line, which is the main factor in quality work.

The disadvantages are that some materials cannot be processed with a propane cutter, such as cast iron and high-alloy steels.

Steel materials with high carbon content are not recommended to be cut with a gas device. The reason is the high melting point, close to the source parameter. Instead of scale ejected from the impact of the nozzle, the material reacts with the edges of the edges, as a result of which oxygen access is stopped and the joint cannot be processed.

Working with cast iron can cause some difficulties, such as the presence of graphite, grain shape. Also, gas cutting with propane is not used in cases of processing copper, aluminum, and other easily melting steels.

Necessary equipment

To perform various steel processing tasks, it is necessary to prepare equipment and appropriate tools. Operation is carried out using:

• oxygen and propane cylinders;
• cutting tool;
• mouthpiece of a certain size;
• hoses.

Safety precautions require the presence of a control valve on each cylinder. The propane cylinder has a reverse thread, so installing an additional reducer is impossible. The equipment has similar designs, both for home use and for industrial purposes. Before cutting metal, it is necessary to check the functionality and presence of all adjustment elements.

Hoses for oxy-propane cutter

The supply of ozone is marked in blue; the valves are located both directly on the cylinder and on the cutter. The propane stream is marked like all other gases and explosive substances, in red or yellow.

After connecting the torch, a process begins in which oxygen and propane merge in the mixing chamber, resulting in the formation of a flammable mixture. The design provides for the replacement of units for scheduled repairs and maintenance; if one of the units fails, it is possible to replace it and continue working. The mouthpiece is selected depending on the type of tasks performed, has different indications and differs in numbers.

Cutting nuances

The cutting process involves speed control, the selection of parameters occurs visually, depending on the number of sparks and their scattering. The stream of sparks generated by the cutting process must be generated at an angle of 90° with respect to the surface. The speed is adjusted if the flow changes direction, in this case the speed is low, requires adjustment.

The thickness of the structure affects the process; in the case of a processed sheet with a thickness of more than 6 cm, it must be placed at a slight angle to allow the slag to drain off.

When processing thick products, it is important to maintain an inclination angle of 15 ° more and control the speed. If cutting is stopped in the middle of the path, the process does not resume at this point, but occurs all over again.

To avoid rework when working with a thick product, it is necessary to guide the cutter so that the metal is processed along the entire perimeter.

Cutting metal with a gas cutter

After cutting the steel, the supply of cutting gas is turned off. Then the valve on the cylinder is closed, the last step is to close the supply of the combustible mixture.

Surface and figure cutting

The process of creating a relief on the surface of a metal is done in a slightly different way. Cutting is performed with a nozzle, and the molten slag heats the lower part of the product. Heating is carried out to a temperature not exceeding the ignition of the material.

Opening the cutting oxygen will provide a defined area of ​​material combustion, resulting in a clean edge and cut line.

The action is performed at an angle of up to 80 °; after gas is supplied, the cutter moves to angles from 18 to 45 °. The formation of grooves of the required size is carried out by adjusting the speed.

A larger groove size is achieved both by changing the angle of the mouthpiece and by slowing down the speed and adjusting the oxygen level. The width of the groove is changed by adjusting the flow of the jet through the nozzle; the ratio of the depth and width of the groove is equal to 1 to 6.

Width under this condition is the predominant object, because formation of sunsets on the surface of the product is possible.

What to look for when choosing a gas cutter

The selection of a quality tool directly depends on the result. If certain parameters are neglected, certain properties of the cutter are lost and safety parameters are reduced. Propane and oxygen are explosive substances that require compliance with certain operating requirements:

• The handle is made of aluminum alloys; plastic is used with cheaper tools; over time it melts and loses its shape.
• A brass nipple will last longer than an aluminum structure, as it has a greater resistance to deformation.
• The rotation of the valves should be done with little force to stop the process in case of an unusual situation. The recommended valve size is at least 4 cm.
• The most reliable spindles are made of stainless steel and can withstand up to 1500 cycles without replacement; brass spindles cannot withstand such a service life. The most suitable option is combination spindles, which have a favorable price-quality ratio.
• The design of the cutter must be dismountable; maintenance is carried out to extend its service life. Mouthpiece material is copper.

Valve-type oxygen-propane cutter

It is necessary to pay attention to the availability of repair kits and spare parts for the cutter. If they are not available for free sale, problems may arise during repairs.

How to use a propane oxygen torch

The operation of a propane-oxygen cutter requires compliance with certain rules. Before using equipment with an oxygen or propane torch, it is important to familiarize yourself with the following requirements:

• Compliance with safety precautions is not neglected; it is important to use a protective mask or specialized glasses. Also, the operator's clothing must be made of fire-resistant material.
• The flame from the torch should be directed away from the gas supply hoses on the opposite side.
• The location of gas cylinders is not allowed at a distance closer than five meters to the place of direct work.
• Dissection is carried out outdoors or in a room with proper ventilation.

Long-term downtime of equipment requires prevention before resuming work. Before starting the test, the propane hose is disconnected and gas pressure is applied. The injector is checked with a finger at the hole; if suction occurs, then the equipment is in good condition.

Source: https://stankiexpert.ru/spravochnik/svarka/rezak-kislorodno-propanovyjj.html

Features of the selection and operation of a gas cutter for metal

In production and in private workshops, situations often arise when you need to quickly cut metal parts. For this, a welding machine, grinder, or hacksaw can be used. One of the popular types of equipment is a gas cutter for metal.

Device and parameters

An apparatus for cutting metal parts using gas consists of several elements. The master needs to know its structure in order to take certain measures in case of breakdown or jamming. Main details:

• handle;
• frame;
• channels for supplying flammable gas and oxygen;
• mouthpiece;
• a nozzle responsible for the formation of a burning jet.

In addition to the key elements, the metal cutter has gas supply regulators, a system of channels through which they pass through the body and reach the outlet openings. The dimensions of the apparatus for cutting metal parts are smaller than that of a grinder, however, the burner requires the connection of cylinders with consumables, which complicates the delivery of the equipment to the workplace.

Gas cutter for metal: varieties

Gas cutters for metal are divided according to different criteria. For example, there is a classification based on the gas used, dimensions, type of cutting, design, and method of mixing consumables.

Acetylenic

It is a metal cutter that is used for cutting thick metal parts. Acetylene equipment is equipped with additional valves that allow you to set a high gas supply rate. There are industrial and portable models of cutters. Acetylene provides maximum flame temperature. This results in a greater depth of metal cutting.

Acetylene metal cutter

Propane

Propane-powered equipment is used for cutting alloys, non-ferrous and ferrous metals. The maximum cutting thickness is 300 mm. Propane cutters are more reliable, which ensures their durability during active use. Masters pay attention to the safety of such devices. They are often used when carrying out independent work in private workshops.

Portable cutting torch

You can buy a device for autonomous operation. Mini cutters fit in the palm of your hand. They are a metal canister of gas onto which a nozzle with a flammable substance supply system is screwed. You can compare a hand-held device with a turbo lighter.

Using matches, a lighter or an installed ignition system, the gas is ignited and passes through special nozzles and nozzles, which form a thin stream of high-temperature flame. It does not go out in strong winds, which makes it easy to use a handheld cutter outdoors.

To fill a small can, you can use a special refill nipple or buy a new full container.
Operating principle and classification of gas cutters

Advantages and disadvantages

If you need to cut a metal sheet, you can use different equipment and devices. This could be a roller knife, hand scissors, a grinder, a laser or water cutting machine. Each method has strengths and weaknesses. Advantages of gas cutters:

1. Large cutting thickness. Depending on the type of equipment chosen, it is possible to cut a metal sheet with a thickness of 500 mm.
2. Low price for burner, cylinders, connecting hoses.

Flaws:

1. When a metal is heated strongly, it undergoes thermal deformation. Because of this, the structure of the material changes.
2. Large cutting width, which is unacceptable if the exact dimensions are observed.
3. If the sheet thickness is small, a flame cone is noticeable on the cut.
4. Inability to work with stainless steel and non-ferrous metals.
5. High cost per meter of cut sheet.

After cutting metal sheets using a gas torch, you need to additionally process the ends.

To make a quality cut, you need to control the distance between the torch nozzle and the surface of the material. To do this, you need to make a homemade carriage that will support the working part of the equipment in one position above the metal sheet.

Selection rules

When choosing a cutting torch, you need to consider a number of recommendations. You should pay attention to the following factors:

1. Comfort is an important indicator that determines how long a technician can work with the device without fatigue. It is advisable to hold the burner in your hands. This will help you understand how comfortable it will be while working.
2. Mouthpiece material - the outer part of this burner element should be made of chromium bronze. Pure copper with a red tint is acceptable.
3. Connecting tubes must be made of brass.
4. It is advisable to choose a burner without a decorative coating. The paint will cover possible defects in the assembly of the device.
5. When working with oily or painted surfaces, you need to choose long cutters (up to 800 mm). This length will protect the brush from injury from the flame.
6. Choose an aluminum handle. Plastic is less durable and wear-resistant.
7. Flame temperature and gas flow rate affect the cutting thickness of metal parts. The cutting depth is indicated by special markings. For example, if you need to cut sheets up to 10 cm thick, the machine will be designated P. To cut sheets thicker than 10 cm, you need to select the P3 marking.

It is important to check the equipment before leaving the store.
To avoid unnecessary problems in case of possible breakdowns of the gas burner, it is necessary to obtain a guarantee. How to choose a cutting torch

Setting up a cutting torch

After purchasing the equipment, you need to assemble and configure it. Stages of device assembly:

1. It is necessary to install a reducer on two cylinders. Red is set to propane, blue to oxygen. Before screwing it on, you need to check the presence of rubber seals. The valves themselves must be free of oil or grease.
2. Next you need to secure the gas supply hoses. They are screwed into the threads of the gearboxes. Secure with clamps. It is better to use metal fasteners.
3. After connecting the hoses to the cylinders, you need to secure them to the burner according to the diagram specified in the instructions. It is included with the device.

When the assembly is completed, you can proceed to the configuration stage. In this case, you must follow some recommendations:

1. When working with acetylene, you need to open the valve one full turn. The pressure should not exceed 1 atmosphere. It is advisable to set the pressure to 0.54 atmospheres.
2. Next you need to blow out the hoses. To do this, you need to open the valve on the burner and wait for the sound to change.
3. After adjusting the supply of additional consumables, you need to adjust the oxygen flow. The optimal pressure value is 2.0 atmospheres.
4. Next, the hoses are purged by opening the valves on the cylinder and burner.

Typically, instructions for assembly, configuration, and further use are indicated on the packaging or in receipts that come with the gas apparatus.
Cutter — set up correctly (step by step).

Preparing for work

Before you start working with gas cutting equipment, you need to prepare. It includes actions that reduce the risk of damage to the device, workpiece, and injury. Preparation stages:

1. Inspect the cylinders, connecting hoses, fasteners, and burner for damage. They must be intact, without visible defects.
2. Sniff the surrounding air. This way you can detect a gas leak. Initially, you need to connect the hoses to the cylinders and the burner, clamp them with clamps. The flammable mixture should not burst out.
3. Rubber seals must be intact. If cracks appear on them or their shape changes, it is necessary to immediately replace the gaskets with new ones.
4. Before opening the oxygen valve, it is necessary to check the equipment for grease stains and oil leaks. Even small amounts of these substances can cause an explosion.

It is important to connect the hoses correctly without confusing the gas supply.

Preparing to use a cutting torch

Instructions for use

Cutting metal with a cutter must follow the instructions. It consists of several stages that must follow strictly in arcs:

1. Open the oxygen valve.
2. Open the gas cylinder.
3. Ignite the stream of gas mixture that comes out of the burner nozzle.
4. Using the valve system, adjust the gas flow rate.
5. Heat the metal surface until its color changes to straw.
6. Metal cutting begins after opening the oxygen valve on the torch.
7. To complete the cutting, you must first turn off the gas and then the oxygen.

The nozzle can be cooled in cold liquid.
How to use a cutter correctly.

Do-it-yourself cutting torch

Making a gas cutter with your own hands is not very difficult. Using a homemade machine you will not be able to cut thick sheets of metal, but it is suitable for thin sheets and low-melting alloys. Required materials:

• copper wire;
• droppers - 2 pieces;
• metal canister of gas for refilling lighters;
• needle for inflating balls;
• aquarium pump;
• soldering iron, consumables for it;
• needle file;
• nipple;
• compressor.

Making a homemade cutter:

1. Bend the needle from the dropper. The optimal angle is 60 degrees.
2. Make a hole on the side of the needle to inflate the swords. Pass the bent needle from the dropper through it. The tip should extend 2 mm.
3. Wrap the holes with copper wire and go through them with a soldering iron.
4. Attach the tubes from the droppers to the ends of the needles.
5. A thick needle for inflating balls should be connected to a gas cartridge, a thin needle to a compressor.

To regulate the flow of gas supply, plastic jumpers are used, attached to the tubes from the droppers.
Gas cutter for beginners (assembly)
A gas cutter for metal is used for cutting thick metal sheets. With its help, you can make a cut to a depth of up to 50 cm. You can assemble the device yourself, but its capabilities will be much lower than that of a purchased cutter.

Features of the selection and operation of a gas cutter for metal Link to the main publication

Source: https://metalloy.ru/obrabotka/rezka/gazovyj-rezak

How to use a cutting torch

A gas cutter is a tool for cutting metal, heating and cutting metal surfaces, etc. The mechanism of its operation is the blowing of molten metal with a jet of cutting oxygen, which is supplied under pressure.

The metal is melted by the flame of a mixture of flammable gas (propane or acetylene) and oxygen. The heated metal is then cut by a jet of cutting oxygen. Please note: non-alloy and carbon steel can be processed in this way.

Other alloys and metals are cut using other cutting technologies.

How to use a gas cutter correctly: preparatory stage

Before you begin the procedure itself, you need to acquire the required equipment. It includes:

• fire extinguisher Manipulations with such equipment are dangerous in terms of fires, so you should have a means to extinguish fires. If there is nothing nearby that is plastic, oil-based, or other materials that burn easily and quickly, a standard set of fire-fighting equipment will do.
• special fire-resistant suit - a canvas welder's suit with fire-resistant impregnation and a welder's suit made of split leather. Nylon, synthetics, loose fit, protruding pockets and cuffs, torn edges are prohibited as they are easily flammable. As for shoes, the ideal option would be special fire-resistant lace-up boots with leather soles, which reduce the risk of injury. The necessary equipment includes leather (or split leather), canvas with OP gloves or gloves and safety glasses;
• metal ruler and square , universal and other special welder's templates, special heat-resistant markers or, at worst, a soapstone pencil for measuring and marking;
• special lighter for the cutter . The use of matches or a regular lighter can cause injury and is therefore prohibited.

Next, you should prepare your workplace. There are also several rules about this:

• cutting should be done in a well-ventilated area, and best of all, in an open space;
• there should be no flammable objects around within a radius of 5 m: paper, dry branches, shavings, etc.;
• You can use a cutting torch on an earthen or concrete floor;
• the best support option for such actions is a steel table;
• Make sure that the flame does not come into contact with the concrete while cutting. This can lead to damage to the latter (crack due to expansion).

After this, mark the specific areas where you will cut with a heat-resistant marker.

How to set up a cutting torch

Immediately before starting action, you must:

• carefully check the tightness of all connections so that there is no gas leakage;
• make sure that nothing and no one will disturb you (animals, strangers, children, objects at hand);
• put on protective equipment.

For subsequent correct and safe operation of the cutter, it is necessary to connect it correctly. This is done in several stages:

1. Connecting the cutter to a gas source - a flammable gas cylinder (propane or acetylene) and an oxygen cylinder through a reducer with high-pressure hoses. Strictly according to GOST, hoses for acetylene (propane) and oxygen differ in color (red and blue, respectively), so it is quite difficult to confuse them. To avoid incorrect connection of hoses to the torch or reducer, use nuts with left-hand threads for flammable gases and right-hand threads for oxygen.
2. Check whether the propane or acetylene supply reducer is open.
3. Adjust oxygen supply. To do this you need:

• open the main reducer of the oxygen cylinder all the way;
• slowly turn the supply regulator until the pressure required for operation is established on the low pressure gauge;
• open the oxygen valve of the cutter and remove air from the hose;
• close the front valve.

How to operate a gas cutter: algorithm for performing the operation

The next steps look like this:

1. arson . To do this, open the heating oxygen valve slightly (about a quarter turn), and then open the heating gas valve one turn. Bring the lighter to the cutter and ignite the flammable mixture. Pay attention to the flame: it should have a sharply defined core.;
2. flame length adjustment . This is done by adjusting the gas supply valve. In this way, the flame can be increased to 25 cm. Please note: if it jumps or comes off the mouthpiece, then you have overdone the flammable gas;
3. opening the oxygen preheating valve . This must be done gradually. In the process, the flame will change color to blue. Oxygen should be supplied until the internal flame is slightly longer than the thickness of the steel being processed. Monitor its stability: if wheezing or instability appears, reduce the oxygen supply;
4. heating a section of metal . To do this, bring and hold the tip of the fire to the steel at a distance of approximately 1 cm;
5. blowing metal with oxygen . Smoothly press the cutting oxygen lever or valve, then you can increase the pressure and cut steel. Add cutting oxygen if necessary.

Once the cutting process begins, carefully move the cutter along the marked line. If you do everything correctly, the slag and sparks will be blown away. When this does not happen, it is necessary to reduce the speed or take care of better heating of the metal. Continue this process until you have cut off everything you need.

After finishing the cutting process, the product must be allowed to cool. If you have enough time, leave it to cool naturally. You can speed up the cooling process by dipping it in a container of cold water.

The last step is to remove any slag from the cut and sand it down (if necessary).

These are all tips on how to cut with a gas cutter. Always remember safety precautions and suitable equipment, move cylinders only vertically and keep the mouthpiece clean and replace it in a timely manner.

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Source: http://www.avantcom.ru/articles/kak-polzovatsia-gazovym-rezakom

Design and selection of a gas cutter - how to properly cut metal with a gas cutter

Let's consider the key points that you need to pay attention to when choosing a gas cutter for comfortable work.

When choosing gas cutters, you need to decide what thickness of metal you plan to work with:

• Metal thickness up to 100 mm
• Metal thickness from 100 mm to 300 mm

Next, you need to understand what flammable gas you plan to use - acetylene, propane-butane.

Also, pay attention to the design features of the cutters. There are injection, universal 3-pipe cutters, on which you can use replaceable gas mixing mouthpieces for the required type of combustible gas, and kerosene cutters.

Injection cutters have long been known, are familiar to many specialists and are quite widespread. They are distinguished by their simplicity of design - but it must be remembered that due to technological features, such cutters should only be used with a fire-preventing valve installed.

Injection cutters

Propane cutter R3P “PTK”

RUB 1,980

Fire protection valves are available in three types, depending on the installation method. They can be installed on:

• torch or torch inlets
• gearbox output fittings
• into the rupture of rubber-fabric sleeves

Fire protection valves

A modern alternative to injection cutters are cutters with gas mixing. In such cutters, gas is delivered to the mixing point (cutter head) through separate tubes - and the volume of already mixed gases is minimized, which makes work safer.

According to the location of mixing, cutters are divided into:

Depending on the nature of the planned work, it is necessary to select the length of the cutter. As a rule, short cutters are used for work that involves precise cutting of parts, cutting of dimensional profile blanks, or other similar work. To perform separation cutting and work with hot metal, elongated cutters with different head bend angles are used. They help ensure that the gas cutter is at a safe distance from the flame of the cutter and the metal being cut.

Extended cutter P3-300KU, L=1100

RUR 2,880

Extended cutter P3-300VU, L=1100

RUR 2,880

Extended cutter P3-300VU, L=900

RUR 2,400

Extended cutter Р3-345ВУ, L=900

RUR 2,468

The cutters also differ in the design of the cutting oxygen supply unit. Most often, valve cutters are used to perform precise cuts. It is worth paying attention to the size of the “lamb” so that it fits your hand.

Traditionally, “lambs” with a larger diameter are considered more convenient, since they are easier to handle with protective gloves. For separation cutting, cutters with a valve are usually used. When the metal is heated to the melting temperature, the cutter opens the cutting oxygen valve and cuts.

When reconfiguring, you can only connect a preheating flame with a low oxygen consumption to the next cut.

We hope that this review will help you choose equipment that will be suitable for solving your tasks and will allow you to work efficiently and with pleasure.

Source: https://ptk-svarka.ru/blog/kak-pravilno-vybrat-rezak-dlya-raboty

How to properly cut metal with an oxygen-propane cutter?

Compared to gas welding work, gas cutting requires much less skill from a person. Therefore, mastering a cutting torch is not that difficult. It is enough to understand how to do it correctly. Propane cutters are the most widely used in our time. They use propane and oxygen together, since their mixture gives the highest combustion temperature.

The propane cutter is designed for manual separation oxygen cutting of carbon and low-alloy steels using propane.

Let's get started

We set the oxygen reducer to 5 atmospheres, and the gas reducer to 0.5. (Typically the ratio of gas to oxygen is 1:10.) All torch valves should be set to the closed position.

To operate the cutter, set the gearbox to 5 atmospheres, and to the gas gearbox - 0.5.

Take a cutter, first open the propane a little (a quarter or a little more), and set it on fire. We rest the cutter nozzle against the metal (at an angle) and slowly open the regulating oxygen (do not confuse it with the cutting one). We adjust these valves one by one to achieve the flame strength we need.

When adjusting, we open alternately gas, oxygen, gas, oxygen. The strength (or length) of the flame is selected based on the thickness of the metal. The thicker the sheet, the stronger the flame and the greater the consumption of oxygen and propane.

When the flame is adjusted (it turns blue and has a crown), you can cut metal.

The nozzle is brought to the edge of the metal, it is held 5 mm from the object being cut at an angle of 90°. If a sheet or product needs to be cut in the middle, the metal should be heated from the point from which the cut begins.

We heat the top edge to 1000-1300° depending on the metal (up to its ignition temperature). Visually, it looks as if the surface has begun to “wet” a little. Warming up takes literally a few seconds (up to 10).

When the metal ignites, we open the cutting oxygen valve, and a powerful, narrowly directed jet is supplied to the sheet.

The cutter valve should be opened very slowly, then the oxygen will ignite from the heated metal on its own, which will avoid the backlash of the flame, accompanied by a pop. We slowly move the oxygen stream along the given line.

In this case, it is very important to choose the right angle of inclination. It should first be 90°, then have a slight deviation of 5-6° in the direction opposite to the cutting direction. However, if the metal thickness exceeds 95 mm, a deviation of 7-10° can be allowed.

When the metal has already been cut by 15-20 mm, it is necessary to change the angle of inclination by 20-30°.

Nuances of metal cutting

Scheme of the separation oxy-fuel cutting process.

You need to cut metal at the right speed. You can determine the optimal speed visually by how the sparks fly. A stream of sparks at the right speed flies out at an angle of approximately 88-90° to the surface being cut. If a stream of sparks flies in the direction opposite to the movement of the torch, this means that the cutting speed is too slow. If the angle of spark flow is less than 85°, this indicates an overspeed.

When working, you always need to focus on how thick the metal is. If more than 60 mm, it is better to place the sheets at an angle to ensure the drainage of slag, and perform the work as accurately as possible.

Cutting thick metal has its own characteristics. It is impossible to move the cutter before the metal has been cut to its full thickness. Towards the end of the cutting process, it is necessary to smoothly reduce the advance speed and increase the angle of the cutter by 10-15°. It is not recommended to stop during the cutting process. If work is interrupted for some reason, do not continue cutting from the point where you stopped. It is necessary to start cutting again and only in a new place.

Having completed cutting, first turn off the cutting oxygen, then turn off the regulating oxygen, and lastly turn off the propane.

Precautionary measures

Cutting metal with gas involves some risk, so you must strictly adhere to safety rules.

Let's start with protective clothing, which should include: a fire-resistant suit and hand guards with the same impregnation; a welder's mask made of non-flammable plastic with a headband; work shoes with high sides. It is also recommended to wear a respirator.

Why breathe smoke and dust? All these measures were not invented by chance, and they should not be neglected. For example, a situation may arise when thick metal is not immediately blown through, and molten splashes will fall on you.

While working, do not forget to monitor the indications of the gearboxes on the cylinders. Remember not to start cutting if there are cracks, breaks or joints in the hoses. Some craftsmen connect the joints with a tube made of aluminum or brass. However, it is better not to take risks. Please note that iron tubes cannot be used for this purpose, as iron can cause a spark.

The most important thing to know when working with gas cutters is that propane is flammable, while oxygen is hazardous to oil. An explosion will occur if oxygen comes into contact with any oil. To avoid disaster, do not touch the oxygen cylinder with oil-stained gloves or clothing. Do not leave oily rags nearby.

Remember that the cylinders should be located at a distance of 10 m from the workplace and 5 m from each other. There is no way to consume all the gas from the cylinder.

Sometimes during work, unexpected situations arise. Don't get lost. For example, if your oxygen hose comes off the fitting or breaks during cutting, do not be alarmed. Usually fear occurs due to the fact that it happens unexpectedly and loudly. It is necessary to immediately turn off the propane supply to the cutter, then close both cylinders. It happens that when igniting the flame and adjusting the cutter, the flame suddenly disappears, making a popping noise. Simply close the cutter valves and reignite the flame.

Source: https://1metallocherepica.ru/instrumenty/pravilnaja-rezka-propanom.html

How to cut aluminum with a cutter?

If there is a need to work with thick-layer metal, a gas cutter is used. It cuts a metal sheet using a hot flame jet. It is formed by mixing two gases - propane and oxygen.

It is impossible to cut high-carbon metals, copper and its alloys, and aluminum with an oxygen-propane cutter. The range of materials that can be affected is limited to low-carbon steel grades from 08 to 20G according to GOST (1050-60) and medium-carbon steel - from 30 to 50G2 (GOST 1050-60).

A propane cutter cuts metal with a thickness of no more than 300 mm.

To work you must have

• high pressure oxygen hoses
• propane and oxygen cylinders
• mouthpiece
• cutter

All parts of gas equipment are standard and can be replaced if damaged.

Preparing for work

Before starting work, you need to make sure it is safe: there should be no traces of oil or other flammable substances on your clothes, floor, and surrounding surfaces. Next, you should inspect the gas equipment for completeness and serviceability. The following steps will help get your equipment ready:

1. Flush all high pressure hoses with gas to remove dust and dirt before connecting them. Check for suction in the cutter channels. Attach the oxygen hose to the right-hand thread fitting using a nipple and nut. Attach the propane hose to the left fitting;
2. Check for gas leaks in detachable connections;
3. Check the serviceability of the pressure gauges. Pay attention to the tightness of gas reducers.

Beginning of work

Oxygen consumption when cutting metal is 10 times higher than propane consumption.

1. Close all cutter valves and set the operating atmospheres on the gearboxes: oxygen - 5, gas - 0.5.
2. Open the propane tank a quarter of the way and light it.
3. Place the torch nozzle at an angle against a metal surface and slowly open the oxygen control.
4. Proceed with the process of adjusting the flame: alternately open the oxygen and gas until the flame turns blue and has a crown.
5. Select the flame strength based on the thickness of the metal.

 Cutting process

1. Start cutting the metal from the point where you want the cut to start.
2. Heat this point to the ignition temperature of the metal (1000-1300 C). When the metal ignites (the surface will look wet), open the cutting oxygen valve and release a narrowly directed stream.
3. Smoothly move the oxygen torch along the cutting line, at an angle of 84-85° in the opposite direction from the cut. If the metal thickness is more than 95 mm, make a deviation of 7-10°.
4. After the cut line has reached 15-20 mm, change the inclination angle to 20-30°.

With the correct choice of the speed of movement of the cutting torch, a stream of sparks and slag flies out of the cut straight down, and the edges are clean and there are no smudges or deposits.

If your oxygen hose breaks during work, don’t panic. Close the propane supply and then both tanks. The flame that disappeared during the adjustment process must be re-ignited by first closing the cutter valves.

Safety precautions when cutting and welding

The developed clear safety rules made it possible to make the process controllable, the life and health of carvers and others became out of danger:

1. Using a special mask with light filters, a respirator and a protective suit.
2. Admission to work for persons who have reached the age of 18 and have completed a special course in gas work and have a certificate with a mark for carrying out this type of work.
3. Cleaning the tightness of all connections of equipment, pipelines and fittings to prevent gas leaks.
4. Use of special carts and stretchers to move individual cylinders. No cylinders hitting each other during transportation.
5. Liquefied gas, grease, and oil must not come into contact with the oxygen reducer, valve or hose.
6. Do not open the reducer or oxygen cylinder valve with oily hands.
7. Before starting work, it is necessary to release the mixture of gas and air formed in the hose through the cutter. This way we prevent the occurrence of backlash into the hose and reducer.
8. Heating metal only with liquefied gas without oxygen is strictly prohibited.

We recommend! How to weld aluminum with an inverter using an electrode

Source: https://varimtutru.com/kak-rezat-alyuminiy-rezakom/

How to cut metal with a gas cutter: equipment

Cutting metal with a gas cutter is a simple process compared to similar welding and does not require special skills from the performer. The main thing for the performer is to study the technology of cutting metal using equipment that runs on a mixture consisting of propane and oxygen, which ensures stable combustion and high temperature, allowing you to burn through almost any metal.

Pros and cons

Gas cutting and welding of metals has many advantages, but we are only interested in cutting that has the following advantages:

1. It is in demand when thick metal is being cut or cutting according to a stencil is needed, and the grinder cannot cope with curved sections.
2. The gas analogue is much more convenient to work with, is lightweight, and operates twice as fast as equipment with a gasoline engine.
3. Propane is less expensive than acetylene and gasoline, so its use is more profitable.
4. The cut edge is much narrower, and the structure is cleaner than from an angle grinder or gasoline equipment.

Disadvantages - a narrow range of metals subject to similar processing.

Features of application

To understand how to properly cut metal with a cutter, you need to study the design and know that such equipment is not used for cutting steels with a high carbon content, since it is not possible to create a temperature capable of ensuring stable melting. When cutting cast iron workpieces or structures, a concentration of graphite occurs between the grains of the metal, which makes work difficult.

Surface cutting

Users, of course, are interested in the following question: how to use the cutter during shape cutting. This technique is performed using a tool nozzle, while the molten slag heats the metal, but without exceeding the melting point . The cutter is positioned at an angle of up to 80 degrees, and after oxygen is supplied, the angle changes within 18-450.

Grooves are formed when adjusting the cutting speed; if a larger size is needed, then change the angle of the mouthpiece and slow down the cutting speed slightly, adjusting the oxygen supply. The width of the grooves is changed by adjusting the supply of a jet of burning gas through the nozzle; this parameter is equal to 1 to 6, while care must be taken to ensure that there are no backflows.

Propane to oxygen ratio

To properly cut metals with an oxygen-propane cutter, you need to adjust the gas supply to the nozzle . Such adjustment is carried out according to the recommendations of reference books, which contain tables and diagrams; in the absence of the necessary literature, you must check the technology specified in the documents for the product. In the absence of regulatory documentation, use a ratio of one part propane to ten parts oxygen.

Equipment set

Before starting gas cutting or welding, you should carefully prepare the equipment:

1. Containers with gases.
2. Hoses for connection.
3. Cutter.
4. A mouthpiece having a specific size.
5. Volume adjustment and control gearboxes.

The equipment does not depend on the manufacturer; valve markings are standard.

Preparatory work

How to set up a cutter for cutting metal - first of all, you need to make sure that the product is in good condition and ready for work, then perform the following procedure:

1. The hoses from the cylinders are connected to the cutter, having previously purged the product to remove foreign inclusions from the inside.
2. Oxygen is connected to a right-hand thread fitting, and propane is connected to a left-hand thread fitting.
3. Set the propane supply level to 0.5, and oxygen to 5.0 atmospheres.
4. We check connections for leaks, as well as the operation of gearboxes and pressure gauges.

If gas leaks are detected, tighten the nuts or change the gaskets.

The diagram shows the correct connection of the cylinders to the cutter.

Cutting Features

The cutter must be moved smoothly along the cutting line and monitor the angle of inclination, which deviates 5-6 degrees against the movement of the tool. When the metal thickness is more than 0.95 m, the deflection is increased by cutting through the metal to a depth of about 20 mm, and the deflection angle decreases again. We have already explained in detail how to cut with a cutter so that the cut is even in the previous section.

How much gas is consumed?

Gas consumption when cutting metal with a propane-oxygen cutter depends on the thickness of the structure and the configuration of the cut. For clarity, we present the table below:

Workpiece size (thickness), mm	Hole time, sec	Cut size (width), mm	Consumption, per m3 cut
propane	oxygen
4,0	5—8	2,5	0,035	0,289
10,0	8—13	3,0	0,041	0,415
20,0	13—18	4,0	0,051	0,623
40,0	22—28	4,5	0,071	1,037
60,0	25—30	5,0	0,087	1,461

Gas consumption is significantly reduced when surfacing or soldering is performed.

Nuances

The performer’s task is to maintain the speed correctly:

• normal mode - sparks fly at right angles relative to the surface of the workpiece;
• low speed - flying away from the performer and an angle of less than 85 degrees.

After the process is completed, the oxygen supply is turned off first, and the propane is turned off last.

T. N. Ishkulov, education: vocational school, specialty: fifth-class welder, work experience: since 2005: “Performers who perform cutting for the first time using oxygen equipment must remember that they must start a new cut after a sudden stop from a different point, and not where the process was over."

Negative deformation

Beginning welders are concerned with the question of how to properly use a propane-oxygen cutter so that warping of the surface of the part does not occur. First you need to figure out what factors contribute to the occurrence of these defects:

• with uneven heating of the surface;
• a high cutting speed was selected;
• there was a sharp cooling of the heating area.

To eliminate the occurrence of the listed factors on the workpieces, they are first securely fixed and heated, and the speed is increased gradually. If warping does occur, then the original shape can be returned by firing or tempering, and the sheets can be straightened on rollers.

Kickback hazard

If the jet burns in an incorrect mode, a bang occurs and the flame is drawn inside the product, which leads to an explosion, as the fire spreads through the hoses and reaches containers with gases. To prevent a dangerous situation, the cutter is equipped with a non-return valve, which cuts off the flame and prevents it from spreading.

Terms of use

They are similar to safety precautions when welding, but have specific additions:

1. It is not recommended to neglect protective equipment, as this leads to injury in the form of skin burns or damage to the cornea of ​​the eyes from flying sparks, so goggles and gloves with long bells up to the elbow are required.
2. The performer's clothing and shoes are made of non-flammable material.
3. Gas cylinders are located no closer than five meters from the cutting site.
4. The flame of the cutter is directed only in the direction opposite to the hoses.
5. Cutting is carried out in rooms equipped with strong ventilation or in open areas.

If the equipment is idle for a long time, it is necessary to carry out preventive maintenance before using the cutter for its intended purpose.

Safety precautions

The equipment is classified as explosive, so the work site must be equipped with the following accessories:

• fire extinguisher;
• sand box;
• fire stand with appropriate tools.

Each performer must have a set of protective clothing.

Protected clothing is not allowed to be made of easily flammable material, such as synthetics, and the edges of the sleeves must fit tightly to the body to prevent sparks from getting inside.

conclusions

Before starting work, performers are required to undergo training and be recorded in a special journal; only persons who have passed tests in knowledge of the theory of the process and practical execution of cutting are allowed to work.

Source: https://svarka.guru/oborudovanie/rashodniki-i-kompletuyushie/kak-osushhestvlyat-rezku-metalla-gazovym-rezakom.html

How to properly cut metal with an oxygen propane cutter? — Metals, equipment, instructions

R3P is designed for cutting metal using a flammable mixture (propane + oxygen). This model is in demand; it can be called the most popular among propane cutters; it is sold regularly. The cutter is manufactured in Izhevsk, so the quality is decent. This model is also called JET 055. But all knowledgeable gas cutters call it simply - r3p. (length 480 mm). By the way, there is also an extended model - 800 mm and 1000 mm. They cost a little more. Let's look at the tool in more detail.

It is intended for oxygen cutting of steel (low-carbon and low-alloy), that is, for ordinary ferrous metal. Very often I had to see how metal was cut with this cutter right in the fields (for example, you found a heavy part from a tractor in a field or forest weighing about 300 kilograms, how to take it to the metal delivery point - of course, cut it into pieces - that’s where such a cutter and will come in handy).

For cutting you will need 2 lawn cylinders - fuel (propane) and oxygen. You will also need a 9 mm oxygen hose, 2 gearboxes - propane (orange) and oxygen (blue) and the cutter itself.

It consists of a barrel (2 tubes), at the end there is a thickening - a mixing chamber, where 2 gases are mixed, forming a flammable mixture. Next comes the tip, consisting of two mouthpieces - internal and external. There are 2 fittings for connecting propane and oxygen. By the way, when you screw the adapter to connect the hose to the propane fitting, it has a left-hand thread, so screw it in the opposite direction. The oxygen fitting has a normal right-hand thread.

The cutter has 3 valves - flammable gas, oxygen and the actual cutting valve - oxygen dir.

Contents: Cutter itself 2 nipples (adapter for hose) 2 nuts (left for propane, right for oxygen)

2 additional mouthpieces No. 1 and No. 3, No. 2 already installed.

Mouthpiece numbers are for adjusting the strength and thickness of the flame, number 3 has a thick hole so the flame is stronger and thicker - for cutting something thick and large. If you need to make a thin cut, then use mouthpiece number 2 or even 1. Accordingly, a mouthpiece with a thicker hole “burns” more gas, and the consumption of the combustible mixture is higher.

Beginning of work:

Propane is connected to the lower fitting, oxygen - to the upper. Before starting work, make sure that all connections are securely fastened and there are no gas leaks. All fastenings must be on clamps and sealed. Next, set the gas pressure according to the table in the instructions.

How to properly cut metal with an oxygen-propane cutter?

Then open the oxygen valve a quarter turn, then the propane valve 1 turn. We adjust the flame using the cutter valves, then open the valve of the cutting gas - oxygen. You can work. Turn off the gas in the following order - first flammable gas, then oxygen.

Cutting metal using a propane cutter R3P will help out in conditions of unavailability of electricity, when it is not possible to work with an angle grinder. By the way, a small table showing which number of the internal mouthpiece is suitable for which thickness of the metal being cut:

No.1 5-25 mm No.2 up to 50 mm No.3 up to 100 mm No.4 50-100 mm No.5 100-200 mm

No. 6 200-300 mm

If you install internal mouthpiece No. 5 and No. 6, then they already need another external mouthpiece - No. 2. The fifth and sixth numbers are designed for cutting very thick metal, so they are elongated and have a large hole diameter.

The approximate price of P3P is 1400 rubles. R3PS(800 mm) - 1950 rubles

R3PS(1000 mm) - 2050 rubles

Practical recommendations for cutting

Cutting metal with a gas cutter

Using an insert cutter turns a gas torch into a tool that cuts metal along straight and curved contours, makes holes of large and small diameters, cuts pipes and metal rods. The insert cutter is the most convenient device for beveling the edges of products that must be joined end-to-end.

Before cutting begins, the metal is heated by an annular flame created by the holes of a special mouthpiece arranged in a circle. After heating the metal, the lever turns on the oxygen supply through the central hole in the mouthpiece, which burns the metal as the cutter moves along the cutting line.

During both heating and cutting, the edge of the flame core should be approximately 3 mm above the metal.

To improve cutting accuracy, the cutting line should be marked with special chalk that does not collapse when heated. Marking the cutting line can also be done with a center punch, placing the marks it leaves at a distance of approximately 6 mm from each other. A corner or a special jig should be used as a guide to move the insert cutter along the cutting line.

Just like welding, different insert torches are used to cut metals of varying thicknesses. There is a table to help you select the recommended torch for the job, as well as the appropriate oxygen and acetylene pressures (different from the pressures recommended for welding).

Rice. 123. Insert cutter device : 1 - mouthpiece; 2 — insert cutter; 3 — oxygen supply lever; 4 — oxygen supply valve; 5 — cutter handle; 6 — holes for heating the metal; 7 - hole for cutting metal

Rice.

124. Flame adjustment : 1 - oxygen supply valve; 2 — oxygen supply valve to the burner; 3 — acetylene supply valve to the burner; 4 - normal cutting flame

Insert cutter device (Fig. 123). An insert cutter is screwed to the welding torch barrels, which delivers a mixture of oxygen and acetylene through one tube into small holes in the mouthpiece located in a circle. This mixture is used to heat the metal before cutting.

For cutting metal, a separate tube is provided, which opens and closes with a special lever and supplies oxygen from a cylinder to a large central hole in the mouthpiece. The oxygen supply valve is used to control the supply of oxygen to the preheat port.

Oxygen is supplied to the central hole under pressure, which is maintained in the supply hose.

Adjusting the flame (Fig. 124). Prepare the installation in the same way as for welding work and attach the insert cutter to the welding torch barrels. Set the operating pressure of oxygen and acetylene to the recommended values ​​for the given mouthpiece size.

To ignite the torch, open the oxygen supply valve fully and the acetylene supply valve approximately halfway and light the gas by bringing the igniter to the mouthpiece. Set the flame to normal by rotating the oxygen valve on the cutter insert.

Press the oxygen supply lever for a second and check the resulting flame (if necessary, make it normal).

Oxygen straight line cutting

Rice. 125. Oxygen cutting in a straight line : 1 - clamp; 2 - cutting line; 3 - conductor; 4 — oxygen supply lever

Using a homemade guide (Fig. 125). Draw a cutting line with a special chalk or center punch and place the workpiece on a table covered with metal so that the distance from it to the edge of the table is at least 100 mm.

Using two clamps, secure a piece of angle iron so that there is a distance of approximately 6 mm between it and the cutting line and it can be used as a guide. Holding the side of the torch against the corner, make two or three slow passes along this line. To ensure stability, rest your forearm on the table.

Heat the metal to a bright red color at the beginning of the cut, then open the oxygen supply completely with the lever and begin to move the cutter flame evenly along the marked line, using the corner as a guide.

Using Oxygen Cutting to Bevel Edges

Rice. 126.

Cutting metal with an oxygen-propane cutter

Using oxygen cutting to bevel an edge : 1 - jig; 2 - cutting line

Beveling the edge using guide cutting (Fig. 126). Mark a cutting line on the workpiece and secure the workpiece on the table so that the distance from it to the edge of the table is approximately 100 mm. Set the angle piece so that it is positioned in the shape of the letter L at a distance of approximately 6 mm from the cutting line.

To secure the corner in place, clamp the back flange using two clamps. Heat the metal along the cut line and bring it to a bright red color at the beginning of the cut line.

  How to properly solder polypropylene pipes?

Open the oxygen supply completely and begin to move the torch flame evenly along the marked line, pressing the side of the torch against the corner, so that the cut occurs along a plane inclined at an angle of 45 degrees.

Hole cutting and pipe cutting

Rice. 127. Cutting holes of different diameters

Cutting holes of large and small diameters (Fig. 127). To cut a hole up to 15mm in diameter, preheat the cut while holding the edge of the flame core approximately 3mm above the metal surface.

Then use the lever to gradually turn on the oxygen supply to burn through the metal. To cut holes of a larger diameter, draw the outline of the future hole and burn a hole in the center of this outline.

Rice. 128. Pipe cutting

Cutting pipes (Fig. 128). Draw a cutting line around the pipe. Starting at the top of the pipe, heat the metal by pointing the torch tip toward the center of the pipe, then press the oxygen lever and burn the hole.

Keeping the torch tip pointed toward the center of the pipe, cut halfway through on one side. Release the oxygen lever, raise the torch and, starting again at the top of the pipe, heat the pipe and cut through to the back side.

To complete the cutting, rotate the pipe and repeat the procedure on the other side.

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Source: https://spb-metalloobrabotka.com/kak-pravilno-rezat-metall-kislorodno-propanovym-rezakom/