Tools & Fabrication - MIG, TIG, or arc welding precautions I should take

I have been wary of doing electrical welding on my car. Other than disconnecting the battery, is there any danger to the electronics in the car while welding SFCs in for instance?

Think in terms of minimizing the length and area of
your current loop. Clamp onto something close and
bright and heavy (probably the SFC itself). It's the
current finding an easier path that you most have
to worry about.

MIG is low voltage, constant voltage and less
worrisome. A buzz box can have 2-4X the open
circuit voltage and a bad choice of ground can
put that across something remote.

If it were anywhere near sensors I would pull the
PCM just for luck. Personally I think the SFCs and
floor pan are not too risky but it's not my liability.

Might want to take up the carpet, and maybe the
sound deadening too, electrical is not the only way
things can go wrong when you are making sparks
and craters.

after the battery, nothin to worry bout. if your going to tig weld in there, no need to take out anything at all, cause it doesnt cause sparks to fly, cleanest welding process you can do. mig and stick i would take out what you can and fireblanket the rest of whats left in the car.

mig is high voltage, tig or stick is low voltage

My MIG is ~24VAC at the same 60Hz as the wall outlet provides since its a simple transformer. TIG uses high frequency power supplies.

My big old Hanson MIG is also 24V but DC (select
polarity) and my buzz box on the "maximum arc
stability" range is 80VAC.