Why weld with a GMAW MIG versus metal core wire?
(top) MIG wire is a lower cost for equivalent diameter and packaging when compared to metal cored wire. MIG wire is solid whereas the metal core wire is a tubular wire or is a soft-shelled wire. The metal core wire may be more difficult to feed through the welding gun particularly in small diameters such as 0.035″ (0.9mm). The metal core wire runs smoother on mill scaled or rusty plate and is more tolerant of oil or grease contamination on the plate all while handling gaps easier than the MIG wire. Overall, the metal core wire is more user friendly than the MIG wire.
