This welding head is one special designed TIG welding head for tube to tube-sheet,which is used for carbon steel,stainless steel tube to tube-sheet connection,mainly for protrusion tube and flush tube 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.For OD 32mm and below tube,use localizer to positioning and expansion collet with spring balancer for positioning.lt's compatible with Kunshan Huaheng iOrbital4000, iOrbital5000 programmable digital welding power source to apply in chemical,food,medicine,heat exchanger.power plant,military and nuclear industries etc.