What sound indicates that MIG welding is performed correctly?

A continuous light hissing or cracking sound during MIG welding is indicative of the proper operation of the welding process. This sound suggests that the arc is stable and that the welder is getting good penetration and a consistent weld bead. The hissing indicates that the shielding gas is effectively protecting the weld pool from oxidation, while a consistent cracking noise may suggest an even transfer of the welding filler material and indicates the absence of disruptive variables during welding.

In contrast, the other sounds listed can indicate problems. An intermittent sputtering sound could suggest erratic wire feeding or issues with the shielding gas, potentially leading to a poor quality weld that lacks penetration. A hiss and a plop sound may suggest inconsistent melting or that the wire is not feeding properly, which can lead to weld defects. A continuous fizzing and sputtering sound, while it might seem acceptable at first, often indicates a lack of stability in the welding process, potentially leading to insufficient weld integrity. Thus, the continuous light hissing or cracking sound is the sign of effective MIG welding.