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Understanding MIG/MAG Welding Process, Machines and Accessories.Metal Inert Gas (MIG) / Metal Active Gas (MAG) welding refers to a group of arc welding processes that use the heat generated by a DC electric arc to fuse the metal in the joint area. A continuous electrode (the wire) is fed by powered feed rolls (wire feeder) into the weld pool.An electric arc is created between the tip of the wire and the weld pool. The wire is progressively melted at the same speed at which it is being fed and fo …