I have been making a ring which is made up from .5mm silver sheet, 7mm wide, which will be the inside of the ring, on to which is soldered two D shaped silver wires with one mm wide copper strip in-between. No problem with the sweat soldering, but when I bent the combined strip to make the joint, overlapping and springing back as I always do to maintain tension, the joint opened by almost a millimetre when I tried to solder it. Would this be anything to do with differences in expansion of the silver and the copper?
I have managed it now, but it took several attempts. I've never had this problem with either silver or gold on its own.
Many thanks