From Welding Processes Handbook

In the literature, thermal cutting processes by gas, plasma or laser are often covered in conjunction with the corresponding welding methods. This is because almost the same equipment is used for both processes, and because the methods are often also utilised together. It is then also appropriate to take the opportunity to cover competing methods, such as water jet cutting.

This chapter also describes air carbon arc gouging and oxy-fuel gas flame gouging; methods which are often closely associated with corresponding welding processes.

10.1 Thermal Cutting

Thermal cutting is used considerably in connection with the preparation of parts for welding. In addition to cutting plates etc., it may also be necessary to prepare the joints by bevel-edging them. The quality and smoothness of the resulting cut surface are generally satisfactory for the purpose, and the methods are easy to mechanise.

Oxy-Fuel Cutting

Oxy-fuel cutting uses a flammable gas, generally acetylene or propane. Burning the gas in oxygen, rather than just air, produces a flame with a high temperature. The flame first preheats the workpiece: when a sufficiently high temperature has been reached, a jet of oxygen produces the cut by actually burning the metal. This produces a metal oxide in the form of liquid slag, which is blown out of the joint by the jet of gas.

The flame also helps to maintain the upper surface of the plate above the ignition temperature of the metal while cutting is in progress, although most of the necessary heat required for the...

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Welding Gases and Thermal Process Gases
Welding gases and thermal process gases are specialized gases for welding, cutting or other thermal processing applications.
Industrial Gases
Industrial gases are pure elements, molecular compounds or mixtures that are gaseous or vaporous at room temperature and pressure.
Oxy-fuel Cutting and Welding Machines
Oxy-fuel cutting and welding equipment melt an areas with an arc and then use a high-velocity, high-temperature, ionized gas to make cuts.
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Cutting services use a variety of cutting methods to fashion materials into predefined shapes or sizes.
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Welding and fabrication services provide customized metal forming and processing, typically on a contract basis. Capabilities are usually not limited to welding and fabrication, and may include design consulting, on-site operations, prototyping, and other useful industrial procedures.

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Practice is the best of all instruction. Introduction Oxygen-fuel cutting is an important industrial process. Much more acetylene is used for cutting metals than for welding them. For many cutting...

Overview Gas welding is one of the oldest methods of welding and, for many years, was the most widely used method of metal-melting; however, its use is a lot less common today. Nevertheless, it is a...

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