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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