Upper Ball Joints

SGBARRACUDA said

You can wrap the boot with a wet rag if you want. But if you tack weld them you won't generate that much heat to melt them. The heat will spread thru out the steel. Just don't run a long bead.

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That's right..... you just tack a spot in 3-4 places with a MiG or stick welder. This was (and probably still is) done for Chevy truck lower ball joints if the pressed hole in the arm gets worn. It's a common trick up where the roads are rough all year long and the ball joints get beat up and R&R'd a lot. (WV, central PA)