... , copper, silver, molybdenum ZX7-160S, ZX7-200S, ZX7-250S, ZX7-315S, ZX7-400S, ZX7-500S, ZX7-630SIGBT inverter manual arc welding machineCharacteristics and application:Application: 1. Welding carbon steel, low ... -7.0mm2.0-8mm Gas Flow (L/min)25L/min ZX7-400S, ZX7-500S IGBT inverter manual arc welding machine