Which welding process uses a filler metal that is fed continuously?

The correct answer is GMAW, also known as Gas Metal Arc Welding or MIG (Metal Inert Gas) welding. This process is characterized by the continuous feeding of filler metal through a welding gun into the weld pool. The gun not only delivers the filler wire but also supplies a shielding gas that protects the molten weld area from contamination by the surrounding atmosphere.

The continuous feed of filler metal allows for higher deposition rates compared to other methods, making GMAW efficient for various applications, from thin sheets to thicker materials. Because of the automatic or semi-automatic nature of this process, it provides consistent results and is often easier for beginners to learn compared to other welding methods.

In contrast, the other processes mentioned either do not use a continuously fed filler metal or have a different way of delivering filler material to the weld pool. This highlights why GMAW stands out in terms of its method of feeding the filler metal during the welding operation.