Is the design laid out below good or at least passable and any suggestions for improvement

I want to design a Arc welder based on the king of random design with some variation to make it safer Basic preliminary design Two mot hooked up to out of phase 120v 20A breakers with extra breakers on the actual welder Mots secondary rewound with 16-22 turns 8 awg wire either stripped and recovered with Teflon tape or with the current thick insulation Fan from a convection oven (120v 60hz ac) for cooling Cheap grounding clamp Electrode holder Two pairs locking pliers to hold carbon electrodes with 1)holes drilled for lugs or other wire attaching idea or 2) screw tightening pipe strap things to hold wire on Steel pipe with cover for bottom 1.5 " to 2.5" - depends on price - for aluminum crucible And the main feature I am questioning is the king of random scariac because it seems foolishly risky (as opposed to the entire project which is risky but not foolishly so ) I came up with an idea to replace a variac with a dimmer switch on each input - amperage control - coupled with taps into each of the secondary coils at different intervals to create many different levels of Voltage Obvious safety equipment: welding glasses/mask, welding gloves, thick full coverage shirt and pants 2000 F fire bricks under all work areas (outdoors BTW) water nearby, people far away
thank you



Part 1 of king of random video https://youtu.be/r6oDCbcmtWwPart 2https://youtu.be/hsfgwEUXtTcScariac (diy variac with bucket of water)https://youtu.be/P9UjxG8sN1c

Dan - the King of Random obviously knows what he is doing but you're right, the Scariac is a bad idea.  That said, the KoR had done a fairly good implementation.  I'd have put the main switch outside the device, but then you should have a wall switch as well?  The trouble with these is that resistance +current = heat, and you can find your electrolyte boiling.Dimmer switch - not a good idea because (1) they are usually rated at a couple of hundred watts and your welder could be up to a thousand watts or more and (b) dimmers chop the AC waveform and the resulting transients have been known to cause problems, especially with inductive loads like this.  Your idea to tap the secondaries is good, I had a welder like this once and it worked fine.Most AC welders have a variable air gap in the transformer core to vary the current, you could organise something like that here as the transformer laminations are separated, but be very careful - too big a gap and you'll find huge currents in your primaries if the inductance gets too low.

Thanks I want to clarify that there dimmers would be two dimmers one on each of the 120v 20a power inputs and If I can't use dimmers how do I easily control current since without control of current and voltage one will increase as the other decreases or does it not matter if I get enormous current