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Agreed, the reason the tig-welded nut thing is the goto option is because it applies a significantly high amount of directed heat into the area you want to break any bond from corrosion.
Welding the nut gives a big surface area for a breaker bar, on a freshly hot/cold cycled thread.
pdlouche-
Agree. Not sure that Tig, mig or stick make much difference.
Actually, wonder if dry ice would help? Actually probably not as Ali shrinks more than steel so great on Ali seat posts in a metal frame.
Actually would an induction heater work? One like this https://www.machinemart.co.uk/c/induction-heating/ have used similar bits on nuts, but not on studs.
lynx
I wouldn't do the drill and easy out on an exhaust stud. Have had bad experiences.