MetallInertgasschweißen

Metall-Inertgas-Schweißen, commonly known as MIG welding, is a welding process in which a continuous consumable electrode wire is fed through a welding gun, and an electric arc melts the wire and the workpiece. A shielding gas surrounds the arc to protect the weld pool from air. The method is part of the Gas Metal Arc Welding family (GMAW).

Shielding gas is typically an inert gas such as argon or a helium-argon mixture; sometimes mixtures with active components are used, resulting in MAG (Metal Active Gas). The choice of gas, together with wire type, influences penetration, bead profile, and defect tendency.

MIG welding can join many metals, including mild steel, stainless steel, and aluminum, and is widely used in automotive, fabrication, and construction. It supports high deposition rates and is well suited to automation and portable equipment; various transfer modes (short-circuit, spray, and pulsed) adapt it to thickness and material.

Limitations include sensitivity to drafts that can disperse shielding gas, potential spatter, and lower penetration for very thick sections compared with other processes. Good surface preparation improves weld quality.

Safety concerns involve arc radiation, fumes, and compressed-gas handling. Standard PPE (helmet, gloves, jacket) and proper ventilation and gas cylinder handling are essential. Equipment comprises a power source, a wire feeder, a welding gun, and a shielding-gas supply.