Definitely try the welding a nut on it. I should've suggested that as well. Must be old age... A nut also helps retain the weld on the broken stud. Some times the heat transferred to the stud via the weld can help loosen it as well.
The exhaust guy changed out all of the original studs because they have a habit of cracking and breaking off.
Disconnect your battery to stop any stray current from the welder destroying your alternator regulator.
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