MIG welding (metal inert gas welding) English: metal inert gas welding is a arc welding method that uses a melting electrode, external gas as the arc medium, and protects metal droplets, welding pool and high-temperature metal in the welding area. It is called arc welding. The inert gas (Ar or He) shielded arc welding with solid wire is called MIG welding for short.
Unlike TIG welding, MIG (MAG) welding uses fusible welding wire as the electrode, and the arc that burns between the continuously fed welding wire and the welded part as the heat source to melt the welding wire and the base metal. In the welding process, the shielding gas argon is continuously transmitted to the welding area through the welding gun nozzle, so that the arc, molten pool and nearby base metal are free from the adverse effect of the surrounding air. The continuous melting of welding wire should transition into the welding pool in the form of droplets, and form weld metal after fusion and condensation with the melted base metal.