... arc starting, welding current stability, fast 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, alloy ... steel, copper and other metals. ModelWS-160WS-200WS-250WS-315WS-400Power ...