Anthony to answer your question "It does have only a 3-conductor cord. Should I change it to a 4-lead so it has the ground wire?"
FYI if wired correct ?? IT ALREADY HAS A GROUND WIRE. If its a straight 240 VAC Buzz Box AC Welder (NO 120 VAC used) it would have three leads, Two Hots L1 & L2 240 VAC Line to Line PLUS the third (Bare/Green) safety Equipment Grounding Conductor.
Assuming (No warranty cant say no specs or wiring diagram) its basically an isolation transformer (with no shorts or mis wiring) there would be no physical direct electrical connection of any of the two incoming hot wires to the case/frame of the welder. The welders hot and ground welding leads (secondary winding of the transformer) have the welding voltage across them NOT direct physical electrical connected (only the transformers inductive coupling) to the incoming 240 VAC Primary. The Bare/Green safety equipment grounding conductor should be bonded to the case/frame, that's easy to check with an ohm meter, third ground wire on plug should have low resistance continuity to the case/frame ...
I have owned and used those welders over 40 years and YES felt shock tingles even with a perfect working welder having no shorts
Hopefully some professional welders can respond and I bet neither you nor I are the only ones who have felt a shock using those welders
Thats NOT to say yours may not have a problem or has a short or is mis wired. If in doubt have it professionally tested !!!!!
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