In the world of welding and metal cutting, the cutting torch, also known as an “oxy cutter”, plays an essential role. This tool allows you to cut a large variety of metals with precision, thanks to an extremely hot flame produced by the combustion of a mix of oxygen and a combustible (or fuel) gas, often acetylene. This article aims to supply practical advice and techniques for operation and efficient adjustment of your cutting torch (oxy cutting), as well as an introduction to the principle of oxyacetylene welding and recommended operating pressures.

How to use a cutting torch?

Using a cutting torch requires a prior understanding of safety measures and basic steps to start, adjust and proceed with cutting:

• Safety first: be sure to wear appropriate, individual safety gear, including protective goggles, heat-resistant gloves and protective clothing.
• Preparation of equipment: check the condition of the torch, the hoses, pressure regulators and gas cylinders.
• Ignition: open the combustible/fuel gas valve slightly and ignite the flame with a piezoelectric lighter, then adjust to obtain a small, stable flame.
• Add oxygen: progressively introduce oxygen to obtain the ideal preheating flame, characterized by a well-defined interior cone.
• •Cutting: Bring the flame gently closer to the part to be cut and adjust the distance and angle to begin cutting after a short preheating time.

How to correctly adjust an oxy cutter?

Adjusting an oxycutter is essential for an efficient, safe cut. Here are some tips for correctly adjusting your equipment:

• Combustible/fuel gas pressure: adjust the pressure according to the metal thickness to be cut. Pressure which is too low or too high can affect the cutting quality.
• Ratio of oxygen to fuel gas: a balanced mixture is essential to obtain an efficient flame. Follow the manufacturer’s recommendations for specific adjustments.
• Cutting speed: the speed at which you move the torch will influence the cut finish. The correct speed will give a clean, regular cut.

The principle of oxyacetylene welding

Oxyacetylene welding is a technique which uses the same base as oxy cutting, but with the aim of joining two pieces of metal. The key to success lies in the ability to control the flame so that it supplies the quantity of heat needed to melt the base or parent metal and the filler metal.

Operational pressure for oxyacetylene welding torches

Gas pressure plays a determining role in the welding process. For acetylene, a pressure between 0.1 and 0.2 bar is often recommended, whereas for oxygen, the pressure can vary from 1 to 10 bars depending on the application. It is vital to consult the technical specifications supplied by the manufacturer for precise, safe adjustments.

Conclusion – the art of oxy cutting

Mastering the use and adjustment of an oxy cutter and understanding the principles of oxyacetylene welding are essential skills for professionals working with metals. By following advice on safety, preparation, and adjustment, you can optimize your cutting and welding operations for top-quality results.

To find out more about cutting and welding techniques, and to discover a range of equipment to meet your needs, visit our LE LORRAIN Cutting Torches product page.