The neighbor and I were noodling (danger!). He is an instrumentation guru at one of the local hydrocarbon processing sites. He needs to weld thin type K thermocouples out of raw wire stock. A LOT of thermocouples. Quickly. We goofed around with a 100 amp 6 volt supply and got some fair spot welds pressing them in an X formation between copper electrodes, so now we are looking to produce a bunch and achieve better time/volts/current control.
My thought is to use a simple MOSFET driver circuit controlled by a P1. It will take several MOSFETs paralleled to handle the high currents involved.
Question: Do MOSFETs in parallel inherently current share when their gates are driven hard? Or do they act more like traditional transistors where you have to mess with individual emitter resistors to keep the currents balanced? I suppose I could just try it, but I already spend a lot of time dealing with that pesky purple smoke.