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Better safe than sorry.
As long as the grounded welding lead is close to the spot being welded you should have no issues.
Problems come when the grounded welding lead (wire) is a far distance from the spot being welded. This make you frame or other metal part a giant wire carrying a whole lot of amps.
Electricity takes the path of least resistance, so when the spot being welded is close to the ground wire everything works for the best.
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Just enough knowledge to build a cobra and be dangerous...
You can observe a lot from just watching.
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