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]> Sent by: TechNet <[log in to unmask]> 02/12/2010 07:19 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to [log in to unmask] To [log in to unmask] cc Subject 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]> Sent by: TechNet <[log in to unmask]> 02/11/2010 07:06 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Steven Creswick <[log in to unmask]> To [log in to unmask] cc Subject 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 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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