Are you try to solder thick gold surface? -------------------------- Sent using BlackBerry ----- Original Message ----- From: TechNet <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Sent: Thu Feb 11 14:23:58 2010 Subject: Re: [TN] Old reference for silver solder - what's it cross ref to? Hi Graham - well, ya got me stumped. I have access to all of the QQ-S-571 revisions from "B" and there is no "94" designation in the specification. That drawing note has to newer than QQ-S-571 Rev C, 1963, since that's when the R-RMA-RA convention was first used. The WRAP3 is easy - wire, RA flux, P3 flux core but the 94 LTS is a mystery. If I had to guess, the 94 LTS is a specific supplier alloy designation that has nothing to do with the 571 specification. And the "silver solder" reference is no help as that could be describing a solder alloy family or could be a slang term. Looks like someone created a drawing note mutation! Good Luck. Dave Graham Collins <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 02/11/2010 11:42 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 [TN] Old reference for silver solder - what's it cross ref to? Hello Technet I seem plagued with strange solder questions these days. Can somebody help with a cross-reference from an old solder callout to what this would be referred to as now? I have a drawing that references: "QQ-S-571 alloy 94LTS Type WRAP3", and refers to it as "silver solder". I can get the last version of QQ-S-571 (rev F, before it was cancelled and J-STD-006 adopted), but I do not see this type of callout. Does anyone have something that will tell me what's in this solder? Thanks! Graham Collins Halifax Production Engineering L-3 Communications ES ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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