A little while ago I answered a question from a beginner in this group. She was asking advice on which solder grades to get. I responded in a very 'text book' way - use hard for the first join, then medium and then easy/extra easy so the solder join doesn't reflow and open up. When another experienced silversmith replied using lived experience, it made me question why I went to a text book answer instead of using my own 15 years of experience to reply. What I took from that exchange is the fuller three-tier system is more of a safety net for beginners than what working silversmiths actually rely on.
That's worth sitting with, because this was true to my own experience over the years. I’d just not noticed I'd defaulted to the textbook version without really thinking about it.
So when a bezel reopens while attaching it to a backplate the question isn’t really “which grade of solder did I use”. It’s “did I get a genuinely strong join in the first place”, or “did it only look soldered”.
Most beginners are still learning to read the metal itself and the process. What takes longer to notice is:-
- What evenly heated actually looks like
- What overheating actually looks like - colour changing too fast, metal starting to move or pit versus normal heat colour
- What underheating looks like - solder sitting on the surface rather than being pulled through the joint by capillary action
- What a properly flowed join looks like when it's done, versus one that's merely stuck together with surface tension and flux residue
A join that never fully flowed wasn't structurally solid to begin with. So when it "reopens" at the next soldering step, that's not really the second heat application undoing a good join, it's revealing one that was already weak. The grade was never really the variable that mattered.
My own practice is hard solder for the initial join, hard again for the backplate, easy or extra-easy only for the last, non-structural steps like a bail, ear posts, embellishments. That's not a rule so much as where I've landed after 15 years of learning to actually read flow, rather than trusting a grade to do the reading for me.
If you're newer to this, medium is a completely reasonable place to be working from. It buys you a margin while you're still building that eye. I'm curious what you notice, next time a join comes apart. Was it really the grade, or was there a moment during that first join where you weren't fully sure it had flowed?