Cutting of pipes with a gas cutter. Drilling and cutting metals with an oxygen lance

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Metal cutting, as well as the manufacture of metal parts and structures can be performed by different methods of cutting metal: with gas, plasma and abrasive. Oxygen cutting is the most common process for cutting and cutting metals. It can be carried out almost in all positions, including vertical plane. Oxygen cutting consists of several stages:

M-welding company carries out dismantling of various metal constructions, including oversized, we conduct high-altitude work. We offer gas cutting services in any area of Moscow and the Moscow region, for this you only need to leave an application on the site or by phone, calling on the number listed here. We guarantee the quickest and highest quality gas cutting services.

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Technology of metal cutting with gas

The essence of oxygen cutting is the following. Heater heats metal to an average temperature of 1100 degrees C. A stream of oxygen is then injected into the work area. The flux, in contact with the heated metal, ignites. The heated jet easily cuts through metal sheets, provided the gas supply is constant and stable.

The metal’s combustion temperature must be lower than its melting point. Otherwise, molten but unburned material is difficult to remove from the work area.

Thus, the cutting operation is performed by combusting the material in the gas jet. The main module of the gas cutting tool is the torch. It ensures the precise dosage by mixing gases or liquid fuel vapors with oxygen masses into a gas-air mixture. The torch also ignites the mixture, and there is a separate flow of oxygen to the workplace.

Gas cutting is a thermal machining process. Its advantages are that you can work with any material thickness, and with high productivity. A welder’s daily output can be measured in tons. The experts note the advantage of this technology is that the gas plasma cutting is completely autonomous and does not depend on the presence / absence of power sources. As the welder often has to work in the field or does not have the opportunity to connect to a power source at a particular site.

Handheld oxyfuel metal cutting is available for a wide variety of materials, with the exception of brass, stainless steel, copper, and aluminum.

The technology of gas cutting metal

By the technology of gas cutting, we mean a set of sequential actions, which include:

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Preparing the metal surface for cutting.

Before beginning the cutting process, prepare a clean cut surface. Need to remove scale, rust, and other contaminants. Cleaning surfaces may be done with a wire brush. The cleaning width of the area where the cut is made is about 30-50 mm.

Torch ignition sequence.

All valves on the torch must be closed. First you need to open the oxygen valve. After that you open the fuel gas valve. A lighted flame should be brought at a distance from the nozzle. Be careful. At the moment of ignition, the torch flame is already saturated with oxygen and will immediately have a high temperature. Keep your fingers safe. Adjust flame with two valves on the torch.

First you need to use the torch flame to warm the surface of the metal being cut. Heat up until the surface layer of the metal is melted. Hold the torch vertical with respect to the metal surface. If the metal is very thick (over 50 mm) the torch tip can be directed at an angle of 10-15º relative to the metal. This will improve the heat to the metal.

Distance from nozzle to metal.

For quality cutting, first of all, it is necessary that the core of the flame is at a distance of 2-3 mm from the surface of the metal. It is recommended that this distance is maintained throughout the cutting process. For straight cuts we can use additional gas carts that are attached to the torch. For cutting thick plates with thickness over 80 mm the distance from the nozzle to the metal must be doubled.

Cutting position.

When cutting metal up to 50 mm thick, hold torch at a 20-30º angle to the opposite side of the motion.

Maintaining optimum cutting speed is very important. Cutting at low cutting speeds causes intensive melting of the edges of the cut metal. High cutting speeds will result in incomplete penetration of the metal surface.

In the table below you will find approximate cutting speeds in mm/min:

Thickness of steel to be cut in mm

Gas pressure and oxygen consumption for gas cutting

The table below will show the cutting oxygen pressure:

Thickness of steel to be cut in mm
5 10 25 50 100 200 250 300
3. 3,5 4. 4,5 4. 4,5 6. 7 8. 11 10. 11 10. 12 12. 14

In the table below you will find the data on oxygen consumption when cutting metal with gas:

Thickness of steel to be cut in mm
2 25 50 100 200 300
2,6. 3,0 4,5. 5,0 7,5. 8,5 13,0. 18,0 28,0. 32,0 38,0. 40,0

The torch is closed in reverse order. First the oxygen supply must be cut off, and only then the combustible gas is cut off.

Basic conditions for oxyfuel cutting

Not all metals can be cut with oxygen. These are the necessary conditions without which the oxy-fuel cutting process cannot occur:

  • The melting point of the metal must be higher than its flash point in oxygen. What is the ignition temperature? The ignition temperature is the temperature of heating at which the metal begins to oxidize.
  • The melting temperature of the metal oxides must be lower than the melting temperature of the metal itself. Otherwise, the oxides cannot oxidize the metal. The best known of these metals is aluminum. The melting temperature of its oxide film is about 2050º C, which is higher than the temperature of the oxygen flame.
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The table below shows the melting temperatures of the different metals:

  • The temperature of the metal released during combustion must ensure a continuous cutting process.
  • The metal to be cut must not have too great a thermal conductivity. Otherwise, the heat generated to heat the metal would be dissipated from the cutting zone. These metals are: aluminum and copper.
  • Oxides produced by the cutting process must be able to escape from the cutting zone.
  • Chemical elements in the metal must not impede cutting and harden the metal.

Safety precautions for gas cutting steel

There are several hazards associated with cutting steel: fire, explosion, etc.д. The following rules should be adhered to:

Allowance for metal cutting

Metal gas cutting allowance. a layer which is lost during machining according to the drawing. Norms for steel workpieces are defined in GOST 12169-82 Minimum allowances:

Important! The value of the allowance for metal cutting depends on the width of the furrow, the error of the equipment used, the chemical composition of the material, deviations due to deformations made by workers technological inaccuracies.

Cutting nozzles for hand torches and cutting inserts of torches (PROPAN/Natural GAS/MARR-GAS)

HAND TORCH / TORCH SERIES PL-RC L-PN PB-K/PMY PNME GRICUT
1230 PMYE 123 PMY 1280 PMYE 2280 PMYE 8281 8281 PMYE
Model of cutting insert
Cutting insert MINITHERM 2207-PMY (up to 25 mm)
STARLET 1211-PMY cutting insert (up to 100 mm)
STARLET 1711-PMY cutting insert (up to 100 mm)
STARLET 8702-A/PMYE cutting insert (up to 100 mm)
STARLET 8711-A/PMYE cutting insert (up to 100 mm)
Cutting insert STAR 1230-PMY (up to 200 mm)
STAR 1730-PMY cutter insert (up to 200 mm)
STAR 1730-F cutting insert (up to 200 mm)
STAR 8730-A/PMY cutter insert (up to 200 mm)
Cutter insert STAR 9230-A/PMY (up to 200 mm)
Hand torch model
PROFICUT handheld torch.L/H/HB.A/PMYE
STARCUT 1222-PMYE hand torch
STARCUT 1622-PMY hand torch
STARCUT 2222-PMYE handheld torch
STARCUT 2622-PMYE hand torch
STARCUT 8622-A/PMYE hand torch
STARCUT 9622-A/PMYE hand torch
STARCUT 8222-A/PMYE hand torch
STARCUT 9222-A/PMYE hand torch
ESSEN 1216-PMY hand torch
ESSEN 1625-PMY hand torch
ESSEN 8216-A/PMY hand torch
ESSEN 8625-A/PMY hand torch
HAND TORCH / TORCH SERIES Acetylene Propane/Pyr. gas/Marry gas/ethylene
FD-A Block-A FAG AGNM FD-PM Block-PM Block-YF
STARCUT 1622-A hand torch
STARCUT 3622-A hand torch
STARCUT 1622-PMYE hand torch
STARCUT 2628-A hand torch
STARCUT 7628-A hand-held torch planer
STARCUT 2622-PMYE hand torch
STARCUT 8622-A/PMYE hand torch
STARCUT 9622-A/PMYE hand torch
ESSEN 8625-A/PMYE hand torch
ESSEN 9625-A/PMYE hand torch
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The equipment

The main equipment for gas cutting is a torch. The set includes: nozzle for welding and melting.

Thanks to the torch it is possible to control the dosage of gas mixture and oxygen. This equipment also ignites the combustible mixture and delivers flame to the place of processing.

The torch consists of two units: a cutting unit and a heating unit. The former is represented by an oxygen outlet tube, a valve and an internal type nozzle.

Heating unit includes valves that are designed to regulate the pressure of the gas mixture and oxygen. Also has a feeding tube, an external view nozzle, a mixing chamber, and an injector cell.

Torches can be handheld and machine. The latter are stationary, so it is preferable to use manual ones for repair work.

The following gas cutting equipment is additionally used:

  • pressure reducer. designed to reduce pressure;
  • A device for changing pressure;
  • steel cylinder with gas and oxygen;
  • connecting hoses.

Before using the equipment, it is important to check that it is in good working order to avoid explosion of the cylinder or reducer. The cutting torch is pre-flushed with oxygen.

Popular pipe cutters producers

Products for cutting steel pipes on today’s market are represented by such companies: Virax (France), Kraftool (Germany), Rothenberger, Super-ego and others.

The French manufacturer Virax produces professional equipment for machining pipes made of steel and other materials. Among such tools are gas and plumbing wrenches, threading machines, hydraulic pipe benders, pipe roller cutters, vise and pipe clamps, grate removers, bevelers.

To keep the equipment reliable and serviceable for a long time, it is necessary to give preference to a reputable company

German company Kraftool has gained wide popularity thanks to versatility, high quality and reliability of its products.

Note! Tools are designed specifically for professional use, but domestic consumers can also use them.

Another German concern, Rothenberger, has been on the market for more than 60 years. The main positions of the products of this manufacturer are as follows:

  • installation tool;
  • hand crimpers and products for freezing pipes;
  • tools and materials for working with copper, steel and plastic pipes;
  • equipment for pipe cleaning;
  • diamond drilling systems.

Taiwan company Jonnesway provides a lifetime warranty on the pipe cutters, provided that all operating rules are followed.

Without a pipe cutter quality repair of pipelines and cutting of steel pipes is almost impossible. Thanks to this tool it is possible to ensure a good cleanliness, precision and straightness of the cut.

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