Which welding process can also be referred to as gas welding?

Oxy-fuel welding is commonly referred to as gas welding because it utilizes a flame produced by burning a mixture of oxygen and a fuel gas, typically acetylene, to melt the metal at the welding joint. This process allows for the welding of ferrous and non-ferrous metals and is one of the oldest welding methods, dating back to the early 20th century.

The term "gas welding" directly describes the use of gas as the primary heat source in the welding process, emphasizing the importance of the gas mixture's properties and how they contribute to achieving the necessary temperatures for welding. This method is also distinctive for its portability and versatility, making it popular for repairs and maintenance work.

In contrast, the other processes listed involve different techniques and energy sources, such as electrical arcs or specific gases in different configurations, which do not align with the traditional definition of gas welding. Understanding the unique characteristics of oxy-fuel welding can help in identifying it correctly among various welding processes.