There Dave goes, typing before he has had his diet Coke.
Soldering: everyone knows this is the act of setting your drywall on fire
with a blowtorch as you attempt to fix that slow leak in the copper pipe.
Brazing: what you do with a really fine rack of ribs on the grill
Welding - a small dent on the wall of your well.
Somedays that man takes an awful lot of shepherding.......
Doug Pauls
"David D. Hillman" <[log in to unmask]>
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02/12/2010 07:19 AM
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Re: [TN] Old reference for silver solder - what's it cross ref to?
Hi Steve - you are correct, there are three basic definitions have been
established to keep soldering, brazing and welding from becoming confused
terms:
Soldering - the joining of two metals by heating them to a suitable
temperature below their solidus and applying a filler metal having a
liquidus temperature below 450C
Brazing - the joining of two metals by heating them to a suitable
temperature below their solidus and applying a filler metal having a
liquidus temperature above 450C
Welding - the joining of two metals by heat or pressure, with or without a
filler metal, to produce a localized union through fusion
Sometimes folks use brazing and soldering interchangeably.
Dave
Steven Creswick <[log in to unmask]>
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02/11/2010 07:06 PM
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Re: [TN] Old reference for silver solder - what's it cross ref to?
Graham,
I thought I would have an earlier version as well, but alas I do not.
In any case, my recollection was that this spec was for the more generic
'solders' [at <300-400°C liquidus] and not the more higher temp 'brazes'
like the 780°C CuAg eutectic.
My use of the terms 'solders' and 'brazes' may not be totally correct
[Dave
H can provide clarification], but I would suggest, as others have, that
the
'silver' solder you are looking for is the low temp Sn62 Pb36 Ag2 [Sn62 at
180°C], or Sn96.3 Ag 3.7 [which we used to call 'Sn96/4' or Sn96 at
221°C],
both being eutectic solders.
We used to use both for soldering on thick film Ag, Pd/Ag, or Pt/Pd/Ag's
to
mitigate leaching of the Ag bearing inks.
Since this is apparently for a PWB application, I think one could
reasonably
argue that anything above Sn96/4 is unlikely to be desired.
Get snow?! Michigan dug out again. Will let you know how the next round
is..
Steve C
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