... WS-500 Manuel and argon welding machine1Advanced inverter technology, a machine for TIG and manual metal arc ... dynamic response, low spatter,good weld appearance4.Stable and reliable, energy efficient, small size, light weight5 ... . Unique regulatory function of arc force, convenient and practical6.Weldable materials: carbon steel, stainless steel, ... 1L/min WS-400 Manuel and argon welding machine