High Deposition MIG WeldingHigh Deposition MIG welding is a generic name given to certain adaptations of the MIG welding process used mainly for welding ferrous alloys. It uses the heat generated by an arc struck between a consumable wire electrode and the workpiece to cause melting and fusion in the joint area. The process may be operated manually or be fully automated using robot welders. The MIG equipment required for this must be capable of operating at high open circuit voltage and at high current. Wire feed units operate at very high feed rates (25-50m/min) and the wire is fed though modified welding guns. The main difference between this and conventional MIG is that the welding arc is made to spin due to the high current and high wire feed rate. The various process adaptations use, either Ar-CO2, triple, Ar-CO2-O2, or quaternary, Ar-He-CO2-O2 shielding gas mixtures. The process is at present normally only carried out on carbon manganese steel, alloy steel or stainless steel with the solid wire being chosen to be compatible with the steel being welded. The main safety issues are electrical, the very high levels of radiation from the arc, noise, the very high levels of reflected heat, and welding fume.
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