... accurately, easily to use, high efficiency, software can be upgraded and cooperated with automatic welding machinery.2. Adopt soft contact ... Satisfied AC/DC TIG welding, mix AC/DC TIG welding, MMA welding, and so on.5. Suitable for welding stainless steel, carbon ... steel, copper, aluminums and titanium. Digital IGBT Inverter AC/DC Pulse TIG WSE-315D welding machines