I am welding a box together with a RF Mosfet Transistor in; are there any precautions I should take? Or will this kill the mos straight away? Thanks for any help.
I would think arc welding would be fine. Arc welders work in the 10 to 60 Volt range, so you are not talking about huge voltages anywhere. I would only be worried if you had any large wound coils in the circuit. If you want to be safe, wrap the electronics as well as you can in a single piece of aluminum foil while you weld away.