Hello. I'm a bit of a beginner regarding soldering but gaining confidence!

I've made a couple of silver cones. They have a solder joint. I want to solder them onto a plain silver ring band which also has a solder joint. I have used hard solder so far. I plan to use medium to attach the two cones together and then easy to attach this 'construction' to the ring band. Will I risk the cones collapsing by applying new heat onto a previous solder joint? Is there anything I can do to protect this joint?

Thank you.

Alison