Two pieces to be joined are charged electrically with our tig welding machine and United close. The electric potential outcome in a bend streak while the two pieces are dived thereto. Railroad tracks are frequently joined along these lines. An elevated voltage electric potential over whole results in an electric circular segment (a smaller than expected lightning jolt) between the welding cathode and the workpiece, the electric curve raises the work-piece temperature to the liquefying point where the two pieces intertwine. There are different kinds of tig welding machine, some utilizing filler metals as the anode other that deploy non-consumable tungsten cathode.