Regarding Spot Welding

I would guess that each spot would need it's own controller/supply else all the current would go through the first one to make the best electrical circuit???

But of course you can put as many sopt welders as you like onto one jig and do 'em simultaneously

I supose you could hit all your spots at once an then sequence a single welder rapidly through each... mind switching those currents would be a nightmare!

We need a lot more info!!!

we commonly make 20 or 30 welds a second using a toothed wheel electrode. The welder is a Myachi-Unitek HF25, that is capable of making 25,000 microwelds per second, with a photosensor on the back side of the wheel to trigger the welds. We also do the same thing using ordinary SCR AC Line frequency welders of several brands, but can only get reliable welds up to about 15 per second.

Dick

Multiple welds can be made in series or in parallel. The welding handbook provides diagrams of the various configurations. Of course, each weld uses its block of energy, so your machine must be able to supply enough power for all the welds.