Waits

I know this question is several years old - but for anyone looking for an answer to a similar situation Junksmith has it right. From the perspective of the piece of art, repairs to metal are always glued. I don't know how reversible JB Weld would be, but generally in art conservation and repair, you want to do as little further damage as possible and leave room for a potentially better repair solution that may be developed down the road.