Which fusion welding process utilizes a flame?

Oxy-fuel welding is a fusion welding process that specifically uses a flame generated by burning a fuel gas, typically acetylene, in combination with oxygen. This flame reaches high temperatures, allowing the metals to melt and fuse together at the joint. The versatility and portability of oxy-fuel welding make it widely used for various applications, including repair work and metal fabrication.

In contrast, gas tungsten arc welding and gas metal arc welding utilize arcs created between an electrode and the workpiece, without requiring a flame. Shielded metal arc welding also employs an electric arc but involves a consumable electrode that melts to provide filler material, rather than a flame for the welding process. Hence, the defining feature of oxy-fuel welding is its use of an oxy-acetylene flame to facilitate the melting and joining of metals.