you should be able to buy any plug or outlet that you need to get that to work most hardware stores handle a variety on stock

 

...right now, it has a 220 'crowfoot' style plug - we only have three pin style outlets...
...is it possible to wire a new plug onto the power cable?...

Hello jeverich,

Does "crowfoot" means a four terminal plug? Does the welder use a four wire cable?

If so, the change depends on if the welder uses a neutral wire, to operate some 120v component, such as a fan or transformer.

Keep plugin on!

 

You really need to find the information label on the machine and find out what voltage/phase/amperage it needs to run and then check the power linking inside the machine to find out what it's linked for, according to information you can get from the owner's manual, or possibly a hook-up chart sticker inside the machine. Then you will know what the machine requires. Next step is to find out what is available in the shop and compare the two to see if the machine can be used on the circuit you intend to use it on.

The outlet where you intend to plug the machine into should have a NEMA number on it, like 6-50 or 6-30. That number will tell us what voltage/phase/amperage the circuit is, assuming whomever wired the shop installed the correct outlet for the circuit. More accurate: check the circuit breaker that services that circuit for the voltage and amperage available on the circuit. If your outlet has 3 wires, 220v or above, it's single phase. If it has 4 wires, it's likely 3-phase.

 

A 'crow foot' plug is a Leviton 287T, 2 straights and a round ground is Leviton 931. The ratings on these plugs are where you need to be.