E with DC arc power source, the trolley-style machine conducts welding process shielded by a blanket of granular flux. For such processes as butt welding and fillet welding with or without groove, it can work in horizontal or at most 10 degree slope. The applicable steels include carbon structural steels , low-alloy structural steels, stainless steels, refractory, steels and their clad steels, and etc.