... -315, WS-400, WS-500 Manuel and argon welding machine1Advanced inverter technology, a machine for TIG and manual metal arc weldi2.Automatic ... , easy arc starting, welding current stability, fast dynamic response, low spatter,good weld appearance4.Stable and reliable, energy efficient, small size, light ... (L/min) cooling 1L/min WS-400 Manuel and argon welding machine