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MIG wire is typically made from a solid, non-coated wire or a flux-cored wire. The solid MIG wire is used with a shielding gas, while the flux-cored wire has flux materials within the wire that provide a shielding effect during the welding process, eliminating the need for an external shielding gas. The type of MIG wire used depends on the material being welded, the specific application, and the desired weld characteristics.