I machined this stylus with my lathe and CNC mill out of aluminum. It compares to the Sunstone Engineering Orion HERE and the PUK 3 pulse arc welders that can weld gold, silver, aluminum, copper, steel, nickel etc. The stylus has a solenoid that retracts the tungsten electrode to start and sustain a very hot plasma arc and argon gas to shield the weld like a TIG welder. This plasma arc is used as a heat source to melt the metal together. Filler rod can also be used to make strong and reliable welding seams.