Repairing bonded titanium frame
I recently purchased an older Miyata bonded Ti frame (with aluminum "lugs") on eBay. I just received it today and was dismayed to see that the tubing has come out of the lugs on the headtube downtube joint and the seat tube seatstay lug.
1) can I just JBWeld it? If not, what glue to use?
2) is there some way to permanently fix this and prevent it from happening again?
3) if I were to have a framebuilder reglue it and repair it, what should I expect to pay?
I'm hoping to have this info in hand before I email the seller.