A logic-controlled valve that manages shielding gas (usually Argon) flow before, during, and after the weld (pre-flow and post-flow).

A high-voltage, low-current oscillator circuit that ionizes the air, allowing the arc to jump from the tungsten to the workpiece without physical contact.

An inverter TIG (Tungsten Inert Gas) welder schematic is a complex system of power electronics that converts standard mains electricity into a highly controlled, high-frequency current suitable for precision welding.

Bridge rectifiers and large electrolytic filter capacitors to smooth the DC ripple. Inverter Bridge (The "Switching" Stage):