square wave ac/dc tig welder can used to welded aluminum,aluminum alloy,magnesium alloy,carbon steel,stainless steel 1.upgrade square wave ... worl continuously with high current.7.suitable for welding aluminum and its alloy ,carbon steel,stainless steel,copper ... ,titanium etc metal parameter: ModelTIG200 AC/DCTIG200BAC/DCTIG250AC/DCTIG315BAC/DC rated input voltage (V)220V ...