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History of GMAW Welding GMAW stands for gas metal arc welding, which refers to arc welding using a consumable electrode in a shielding gas environment. GMAW welding is very similar to semi-automatic welding (MIG), as both use a continuous wire electrode and shielding gas. Gas metal arc welding (GMAW) is a welding process that uses a continuous wire electrode and shielding gas delivered to the weld seam by a welding torch. The difference is that semi-automatic welding typically uses carbon dioxide gas and a short-circuit method, while GMAW welding can use a variety of gases and metal transfer methods.