High working efficiency, overload and overheat protection mode, unstable power source. Two function weld: DC (Stick Welding, TIG Welding ARGON) & AC (Alumunium / Stainless Welding). Welding Materials: Iron, Copper, Stainless steel, Alumunium. Application for: Welding iron, stainless steel, alumunium, suitable for home and industrial application, etc.