Rereading the first post I guess these questions come up
Were the threads chased?
What if anything was used as a lube?
Original bolt, but how were they coming out?
How much of the bolt is exposed now that the head is off?
Personally this is where the cheap HF wire feed is worth it.
110V.
You don't have to worry about how well it works for a real welding session. Your filling a hole.
It's small and lite enough to get inside or underneath...
