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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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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