For copper, aluminum, nickel, molybdenum, tungsten, manganese, gold, silver and other non-ferrous metal welding. Widely used in low carbon steel plate, stainless steel plate, galvanized sheet, aluminum plate, wire welding, multipoint projection welding, the automobile manufacturing industry of high strength steel, steel spot welding, nut projection welding, as well as the high and low voltage electrical industry welding of copper, sliver contact and copper sheet.