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there's a couple of methods to try
if you have access to a welder then its possible to try and weld a tab or bar onto it so you can undo the stub You can simply take a washer and a bolt of a slightly larger size and tack weld it to the bolt body. Once you have it tack welded, I like to fill the nut with weld and run a bead around the base of where it meets the bolt body. This allows you to put a socket on the bolt again, as well as puts heat into the bolt that will allow it to expand and contract, breaking some of the corrosion. I prefer to use a MIG welder to do this job as it allows for a little more control than with a stick welder.
if thats not an option then if you can try to use a small chisel to tap the edge of the bolt to try and unwind it as often once the bolt head is removed then there's no tension in the remains of the bolt
soaking everything in penetrating oil for at least 20 minutes beforehand will also help
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