Which gas is typically used alongside acetylene for welding processes?

In welding processes, acetylene is commonly used in combination with oxygen. This specific mixture of gases is crucial for producing a high-temperature flame capable of melting metals. Oxygen supports combustion, allowing acetylene to burn more efficiently and reach the intense heat required for welding applications.

The high-temperature flame generated from the acetylene and oxygen combination is essential for various welding techniques, particularly oxy-acetylene welding, which is used for welding and cutting metals. Achieving the right flame characteristics — neutral, carburizing, or oxidizing — allows the welder to control the properties of the weld, ensuring strong and quality joints.

While other gases like argon and helium can be used for different types of welding, such as TIG (Tungsten Inert Gas) welding, they do not combine with acetylene for the typical welding processes associated with oxy-acetylene welding. Nitrogen does not play a role in this context either. Thus, oxygen is the correct gas to pair with acetylene for welding processes.