... steel, alloy steel, copper and other metals. WS-160, WS-200, WS-250, WS-315, WS-400, WS-500 Manuel and argon welding machine1Advanced inverter technology ... *220*295mm570*320*460mmGas Flow (L/min)25 L/min Cooling water flow (L/min) cooling 1L/min WS-400 Manuel and argon welding ...