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February 2010

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From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Thu, 11 Feb 2010 14:38:34 -0500
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Are you try to solder thick gold surface? 
--------------------------
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----- 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
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[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


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