Welding Challenged asks: "Are both soldering processes? Silver soldering being a specific process,
where brazing is a more generic term? Isn't brazing normally a melted bronze soldering process? An
oxy-acet. torch being necessary to achieve the temps necessary to get the bronze(?) to flow without(!)
melting the parent metals? Thanks for helping a welding challenged person."
Tin Man answers:
Brazing may be done with a variety of the following metals: brass, bronze, silver, aluminum, copper....etc.
Silver soldering is differentiated by temperature into two processes: soft soldering at temps below 650F
using lead-cadmium-antimony-silver
alloys
, and hard soldering above 850F using copper, tin, nickel, zinc, silver alloys.
Alloying
silver with other metals changes the melting point, adhesion and wetting characteristics, and tensile
strength. Of all the brazing alloys, the silver solders have the greatest strength and the broadest
applications.
Braze-welding is another term which covers joining one group of similar alloys, having different melting
points. Joining at a point where the parent metal
does not melt
is brazing, whereas joining its neighbor, which has a slightly lower melting point, actually melts it, and
welding now occurs.
IE: brazing using a brass alloy (yellow brass) on nickel brass is truly brazing for the NiBrass does not
melt, but to braze a yellow brass faucet casting with the
same brazing material
causes the faucet base metal to melt, hence braze-welding or brass welding
. You see, it's all based on melting points.
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