This welding head is one special designed TIG welding head for small diameter tube to tube-sheet which is used for carbon steel,stainless steel tube to tube-sheet connection,mainly for protrusion tube flush tube,tube retraction welding without wire feeding or with wire feeding.The standard small torch with additional gas cover to weld Titanium alloy or other material which need higher protection. It is compatible with Huaheng iOrbital5000 programmable digital welding power source to apply in chemical,food,medicine,heat exchanger,power plant,military and nuclear industries etc.