If Bubba only connects the genny ground and not the neutral to the welder plug ground, yeah, the 120 can get really wonky, especially if he's actually pulling 240 off the generator. It can also get wonky if the system ground/neutral tie point is a significant distance from the welder plug.
Knew one guy (a Bubba wannabe) who killed the compressor in his fridge because he hooked the genny Hot wire to one leg of his welder outlet, and Neutral to the other from a cut off extension cord, splitting a floating 120 between both phases. At least he properly connected the ground... O_o I'm guessing the fridge was trying to run on about 80 volts. I had to explain why the lights were going from not quite bright to dim as it tried to cycle.
Scott, to verify what buickanddeere said, yes a 4 wire (twistlock) plug and cord from the generator takes care of both providing a proper isolated neutral and bonding the generator frame to system ground.
A local electrical supply house has a Clint Eastwood quote on the wall behind the counter that is very apt, in a font size that can not be missed: "A man has to know his limitations." Unfortunately, the ones who should heed it most, don't get it.
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