Hi Rob,
Since no one has responded, I’ll add something. I’m not an enamelist, but I’ve taken a bunch of enamel classes over my lifetime. You need a solder that melts at a higher temperature than enamel.
Here’s a thread about IT silver solder and eutectic silver solder. Both will do what you are describing. There’s also a number of other threads in Orchid on the topic that also have helpful info.
Unfortunately, IT solder used to be sold everywhere that sells silver solder, but I can’t find it anywhere these days. I still have some and I treat like a lost relic from the past. I only use it when absolutely necessary. Eutectic solder is still available through Thompson Enamel.
Two other things to consider. Cold connections - bezel or prong set an enamel piece like stone. Also, I think you said that you have a pulse arc welder. You can possible weld your component in place before enameling.
Unfortunately, all of the regular solders, (easy, medium and hard) melt at too high of a temperature and will destroy your enamel. If you’re really lucky, you can solder enameled silver with a super low temp tin-based solder like Stay Brite, but I wouldn’t recommend that.
Hopefully, this helps a little bit and that some of our enamelist members can fill in details.
Jeff