Technically you are putting surge current onto the tractor ground when welding. Not as much as a lightning strike however. I don't know how much surge there would be but to complete a circuit, it would have to go through the battery if connected and then through the fuses and key switch and other on switches. What's welding current? Maybe 28 volts at 125 amps?
If all your switches are turned off, then any surge current shouldn't get into any electronics. If the battery is connected, I suppose some surge current could go through it and to the starter solenoid.
Due to the resistance of the steel frame, I suppose it would make a difference as to how far you are welding from the electronics as everything would have a common ground to the frame. Welding around the loader would be a lot different than welding around the dash where the electronics are. How long you weld would make a difference as well.
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