MIG Welding, also known as Gas Metal Arc Welding (GMAW), is a process developed in the 1940’s that is considered semi-automatic and requires electricity to produce heat, an electrode to fill the joint and a shielding gas to protect the weld from the air. A MIG welder utilizes a constant DC current while wire and gas are fed continuously through the welding gun and leads as the gun’s trigger is depressed. It is most commonly used in fabrication environments where production needs are high.

Common shielding gases include: