... steel, low alloy steel. 2. Welding stainless steel, high alloy steel, copper, silver, molybdenum ... 630SIGBT inverter manual arc welding machineCharacteristics and application:Application: 1. Welding carbon steel, low alloy steel.2. Welding stainless steel, high ... .Ensure high stability of welding current under electric fluctuation and adjustment of arc length. Self-control ability of electric ...