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SOURCE: I have a miller thunderbolt 225v AC arc welder
The blank should be the grouDING conductor (green) and they may have a green screw to further indicate it.
Since the welder runs on 220, either of the hot wires can go to either of the other terminals (X or Y).. Those wires might be black, red, blue, brown.
There is a slight chance it would be white even though it is hot on the portable cord because some portable cord is used that way.
VERIFY the receptacle you connect to is wired correctely before connecting your unit to it.
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