What does MIG stand for in welding?

MIG stands for Metal Inert Gas, which is a type of welding process that uses a continuous flow of an inert shielding gas to protect the weld area from atmospheric contamination. This method is widely used because it allows for smooth and consistent welds with high deposition rates.

The inert gas, typically argon or a mixture of argon and carbon dioxide, shields the molten weld pool from atmospheric elements that could cause defects or issues such as oxidation and porosity. This protection is crucial in achieving strong and durable welds, especially in various materials including aluminum and stainless steel.

The other definitions proposed in the options do not accurately reflect established welding terminology or correct welding processes. Thus, the correct understanding of MIG as Metal Inert Gas is essential for anyone learning or practicing welding for both safety and quality of work.