One of the first things you need to have in a welding shop is a welder properly wired and grounded.
How to wire a 15 amp 220 volt outlet. It is different from a conventional 120 volt service in that there are two 120 volt hot feeds or legs each at 50 amps.
How To Wire 240 Volt Outlets And Plugs
Understanding 240 250 Volt Air Conditioner Outlets
Build A 240v Power Adapter For Your Mig Welder Make