... metals. WS-160, WS-200, WS-250, WS-315, WS-400, WS-500 Manuel and argon welding machine1Advanced inverter technology, a ... -frequency booster arc, easy arc starting, welding current stability, fast dynamic response, low spatter,good weld appearance4.Stable and reliable, energy ... /min Cooling water flow (L/min) cooling 1L/min WS-400 Manuel and argon welding machine