Hi,
The only thing to do is to drill it and try getting it out with an easy-out tool. If that isn't an option, you will likely need to drill the threaded portion larger and rethread the shaft and then replace the bolt.
As far as spot welding it, anything is possible, but that is a tough one to answer. I wouldn't make it a first choice.
Let me know if you have other questions.
Take care,
Joe
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Sunday, February 5th, 2023 AT 5:53 PM