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Michael A. Terrell

wrote:

Michael A. Terrell wrote:

Rich Grise wrote:

But I definitely got me doubts about "sweat-brazing," primarily because
it brings to mind sweat-soldering, which is trivial to do, works, and
doesn't need an OA flame, but it's only useful for electronic circuit
components. (and "brazing" doesn't seem to work that way. ;-) )

Bull****. I've used it on 3" and 6" copper pipe in the cooling
system of a TV transmitter. Of course, you have to know how to solder
more than a couple twisted wires to do it right..

And sweat brazing works the same way - just needs a lot more heat.
Brazing is just high temperature soldering when all is said and done.

The hardest part of that job was removing the fittings from the old
copper pipe. It wasn't soldered properly and had leaked so some moron
braised the pipe to the fittings over the leaks. I had to saw them off
flush, then file away the brazed spots. After that I had to use
Oxyacetylene torch to heat the fitting while shoving a wide, narrow
screwdriver between the old pipe and the fitting. Once it was pried far
enough I used a big pair of needle nose pliers to twist a kink into the
pipe and slide it out. Then I poured ruby flux on the hot copper and
added fresh solder to properly tin each port. The excess was wiped out,
then the ends of the piper were cleaned & tinned with plenty of 99.5%
tin, .5% Antimony solder. Finally, they were carefully lined up and
heated, then slid together. Only a couple needed a touch of solder to
get a smooth joint all the way around the pipe, and that was just for
cosmetics.

All that work because some idiot was in a hurry, and the custom RCA
parts had been out of stock for over 20 years.

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