What's wrong with my plasma cutter design?
I was thinking about building a homemade plasma cutter. My plan would be to use two linked microwave transformers to step up wall voltage to ~ 50,000 volts. I would use welding carbons in the end of a copper pipe, nozzle, etc, so that an arc would be generated inside of the nozzle. I would then have a PVC assembly that would take compressed air and force it past the arc, and thus generate a spray of plasma? I KNOW how regular plasma cutters work, I was just wondering about this design out of curiosity, but I know there is likely some flaw (e.g. the arc isn't drawn to the work, etc.) that I haven't thought of. Advice is appreciated. Thanks!
P.S. What, if this design works, would stop me from using this to weld? i know that the plasma is too hot, i would just keep the torch a distance away from the work. Or would the air contaminate the weld? Thanks!
EDIT: I know how traditional plasma cutters work. I don't want to strike an arc with the workpiece. I want to create an arc in the device and used compressed air to blow the plasma onto the work. Also, i think i could use a smaller power supply, say 7.5 KV to generate that arc, without MOT's.