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Gas tungsten arc welding, also known as tungsten inert gas welding or TIG Welding, is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area and electrode are protected from oxidation or other atmospheric contamination by an inert shielding gas.
Gas metal arc welding, sometimes referred to by its subtypes metal inert gas and metal active gas is a welding process in which an electric arc forms between a consumable MIG wire electrode and the workpiece metal, which heats the workpiece metal, causing them to fuse.
Shielded metal arc welding, also known as manual metal arc welding, flux shielded arc welding or informally as stick welding, is a manual arc welding process that uses a consumable electrode covered with a flux to lay the weld.