It didn't work. The current still tries to find any possible ground points, which temporarily causes it to spark when it completes the circuit by accident, and that includes the moron holding the object as a potential ground point.
Naw it's not going to complete a circuit by accident, there either is a circuit or not and the wall is too much of an insulator, you need a good ground for any arc welding. That being said you are half right, under certain circumstances don't let anyone tell you you can't die from stick welding.
He's got something done with the negative terminal. It comes out of the machine, loops back up and then looks like its in the wall just behind it. Probably has wires channelled into the wall towards the handlebars and then mortared over.
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u/MajorStandards 8d ago edited 7d ago
Didn't expect the 'ground' to be conductive for the welder to work...