These days IGBT on welding machines reffers to the type of transistors used in the inverter matrix that is at the heart of the inverter welding machines operation. Insulated Gate Bipolar Transistors can be manufactured to operate at any current as opposed to MOSFET types that are limited to 20/30 amps. As a result IGBT transistors do not need to be connected in parallel which can increase reliability dramatically.
IGBT welding machines are the new favourite amongst welding engineers and welders tradespeople although these days there is not much difference in operational reliability between IGBT or MOSFET welding equipment. So now you know what IGBT is on inverter welding machines.
Awesome right… now go get one LOL 🙂