i dont men to weld on to the stud, i mean weld to the nut that is stuck.
If you weld an old bolt or anything similar to it, then put a pole or something over the top for leverage to turn it, or knock it with a hammer. Have done it a few times on stripped nuts that are too far in the wheel to get at.
if you do it this way, weld the bolt or what even you use at an angle that will clear the other studs when turning to make it easier for your self.