Anybody who has checked the wire gauge on power cords for shop equipment or home appliances has probably found them to be undersized. But the NEC doesn't dictate the size of power cords; the manufacturer does. In the case of your welder, the engineers at Lincoln probably figured out the welder will trip its thermal protection long before the 12 gauge power cord overheats.
I use a 12 gauge extension cord on my 170 amp MIG welder. It's never been a problem even on the highest settings, but I can't weld very long at max voltage and wire speed before the thermal switch trips.
None of that changes the requirements for wiring a 240V/50A outlet. It needs to be wired for 50 amps: AWG 10 wire (minimum) and a 50 amp breaker.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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