I'm making my own arc welder for wire.
If you don't mind holding on to the button a while to charge up the capacitor, just get a step up power module and a big capacitor will do the job.
I'm making life difficult by adding a timer circuit. Qorax should be able to guide you where to buy a ready made one.
That's funny. My first thought was I am not holding anything with the words arc welder in it. I have just got rid if the fire suit.

