vj found this in rec.crafts.beads, from "Charlie" :
]If I solder a link that is around one of the handles will the ]handle break from the heat of the torch?
all i can offer is what the jeweler told me. which amounted to "don't do it!" however . . . some of the PMC3+ that uses a lower temperature might work . . .
You should be fine, Charlie... To be on the safe side, I would try to avoid applying the heat directly to the glass, if possible. Even though my vessels are properly annealed, heating the glass yet again could essentially un-anneal it, setting up stressses that could cause it to break instantly or at some time in the future.
You know the silver core beads I make? I have to be really careful when I'm polishing the silver core NOT to allow the glass to get too warm. Same principle: I could un-anneal the glass.
If your feeling lucky you can try sinking the vessle in damp sand to keep it as cool as possible, don't let the ring touch the glass and use low temp solder.
Or there are the new grippy jumprings that lock closed...
If you have a jewelry repair shop near you - you can go there and they will solder the ring for you - not expensive - about $5.00 the repair centers have the laser solder machines (I think that is what they are called) - all I know is that they don't have to use a torch and risk breakage. I found a place near me that is family run and they do alot of little things for me.
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