Oxyfuel gas cutting is also known as _____ in the trade.

Oxyfuel gas cutting is commonly referred to as flame cutting in the trade. This term is used because the process involves the use of a flame produced from the combustion of oxygen and a fuel gas, typically acetylene. The flame reaches extremely high temperatures, allowing it to effectively melt and cut through metal.

The process is based on the principle of oxidation, where the metal is preheated by the flame to a temperature where it can ignite and then is rapidly oxidized by a high-velocity stream of oxygen. This results in the molten material being expelled from the cut, creating a clean separation.

Flame cutting is widely used due to its versatility and effectiveness in cutting various thicknesses of metals, making it a fundamental technique in welding and fabrication. The terminology reflects the technique's reliance on flame rather than any other cutting method, explaining why "flame cutting" is the appropriate term.