I have a bank of 20 3.3 mF 25V capacitors wired in parallel and I want to be able to discharge it very rapidly by shorting two probes coming off of it. (It's a DIY spot welder, pic related) I also want a switching mechanism so that I can position both probes so they have strong electrical contact without discharging the capacitors, and only actually discharge them after hitting a switch of some kind. I'm currently thinking a MOSFET would be the best choice for this. (I'm open to suggestions however)

I imagine dumping a 66 mF capacitor bank charged at up to 25V through just any little transistor will probably blow it up before long, so I want to calculate the peak current that would be passing through the transistor so I have some idea of what might not blow up.

Unfortunately I don't have an oscilloscope, but I do have several multimeters, a wide range of resistors, and know the capacitance and voltage values of the capacitor bank. I don't know for certain what the resistance is for the bank but It's pretty small if i had to guess, less than 1 ohm collectively. I used solid copper wire for residential wiring for almost all of the connections and everything is securely soldered.

>TLDR: How do I calculate the peak discharge current of a capacitor bank being short-circuited?

Or, more specifically, how do I determine what sort of transistor I need to switch it? (or do I use something else entirely?)