Okay, here's my 2 cents worth...
Once the solder stops flowing properly, pickle the piece to remove the
copper oxides, then reflux and continue soldering.
If I were to do this job, I'd get as perfect a fit as possible, one in
which I'd have to force the center into the outside piece. It should be
almost seamless. I'd use a silver brazing flux. I think the trick here
is getting a near perfect fit. My personal technique (for what it's
worth...) is I flow the solder from only one point because I like to
have almost no clean-up after the soldering.
Ok. . . Here is a beginning level note of discussion.
Imagine a flat copper donut. You want to solder a flat silver donut hole
into the center. You have a fairly good fit, you flux, you put your solder
chips around the seam, you torch it. The gosh darn thing simply will not
bridge the seam at cerain areas and you eventually scorch the donut hole into
How can I marry the hole to the donut perfectly?
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