The 110V 220V AC/DC pulse tig welder can weld steel and aluminum sheets. Equipped with AC Square Wave TIG, AC pulse TIG, DC TIG, DC Pulse TIG, Stick, and argon arc spot welding (DC, pulse or AC). Multiple welding modes: The TIG and MMA welding modes make this machine suitable for welding different types of materials, including steel, stainless steel, aluminum, and copper.