The welding head is specially designed for automatic TIG inner hole welding of tubes and tube sheets,and is suitable for automatic welding of inner hole tube sheets.It can weld carbon steel,stainless steel and other tube/tube sheet joint forms without filling wire.The diameter range of the inner hole of the tube should be≥Ø19mm.It can be used together with iOrbital5000 programmable welding power source,which can precisely realize orbital TIG inner hole welding,with high reproducibility of welding results and ideal welding results.Mainly used in petrochemical,boiler,military and nuclear power industries.