What does the official AWS term for MIG welding refer to?

The official AWS term for MIG welding is "Gas Metal Arc Welding." This designation accurately reflects the process, which involves feeding a continuous solid wire electrode through a welding gun while simultaneously supplying a shielding gas. The term emphasizes both the utilization of gas for protecting the molten weld pool and the nature of the arc created during the welding process itself. This arc is generated between the wire electrode and the base material, allowing the metal to melt and fuse together.

In contrast, the other choices do not capture the correct terminology. "Mig Arc Welding," while close, does not adhere to the official nomenclature established by the American Welding Society. "Molecular Interaction Gas" is not a recognized term within welding processes and does not relate to the mechanics of MIG welding. Similarly, "Mechanical Inert Gas" misrepresents the process; while MIG welding does use inert gases, the terminology is incorrect, as the emphasis should be on the gas as a shield rather than a mechanical component. Understanding the formal terminology is crucial for clarity in communication and standards in the welding industry.