... design without brush. 2.Easier arc starting. 3.Stable electric arc. electric welderHCDW-200/250 are the new type of removable electric welding machine ... our own technology.1.Self-driven design without brush,Easier arc starting , stable electric arc2.DC output,large scope of application,good ... .,stable &reliable generating4.High generated output, one unit double usage Electric Welder Generator