... steel, stainless steel, alloy steel, copper and other metals. WS-160, WS-200, WS-250, WS-315, WS-400, WS-500 Manuel and argon welding ... machine1Advanced inverter technology, a machine for TIG and manual metal ... convenient and practical6.Weldable materials: carbon steel, stainless steel, alloy steel, copper and other metals. ModelWS- ... -400 Manuel and argon welding machine