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February 2010

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Subject:
From:
Mike Fenner <[log in to unmask]>
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Date:
Fri, 12 Feb 2010 16:44:57 +0000
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It's a flux cored wire 
W means Wire 
RA means RA
[P means plasticised]
3 is core 3 which from memory was 3.6%. Normally rosin core wire was Core 2,
notional 2.4%
The alloy you got me, There was an Sn96, Sn63 etc, Sn5. Basis for
classifying was Sn not Pb and I don't recall Suffixes in QQS. The LTS could
be Low temperature solder. 

So a typo, hybrid mix from something else, who knows.

But assuming a simple typo and following normal nomenclature for QQS would
make it 94Sn/6Ag with a typo. But LTS doesn't go with that. 
And 94PB/Ag 94Sn/Pb make no alloy sense.


Somewhere I have a copy of QQS but will have to wait till after weekend or
hope there is a techie as old as me, but with a better memory. But I fear 94
PBLTS won't be in it , at least not in the electronic grade soft solders.

Maybe it can be worked out from the application? What is it for?


Regards
 
Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Thursday, February 11, 2010 5:43 PM
To: [log in to unmask]
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


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