Memory jogged. You are right on your choice Jeff.
Sn05Pb94Ag02 (5%/93.5%/1.5%) with solidus 296 C and liquidus at 301C.
LST is Lead Silver Tin
There are a number of functionally identical Pb/Sn/Ag alloys in that zone
and the various National Specs of the time perversely all chose slightly
different ones.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of McGlaughlin, Jeffrey A
Sent: Friday, February 12, 2010 11:55 AM
To: [log in to unmask]
Subject: Re: [TN] Old reference for silver solder - what's it cross ref to?
I found the old chart overnight. There are 2 silver solders listed that
might meet the 94LST Ag5.5 (Ag5.5/Pb94.5) with a solidus of 304 C/liquidus
of 380 C, and the more likely
Jeffrey A McGlaughlin, CID
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of McGlaughlin, Jeffrey A
Sent: Thursday, February 11, 2010 2:46 PM
To: [log in to unmask]
Subject: Re: [TN] Old reference for silver solder - what's it cross ref to?
I think the 94LTS was the designation for "Low Temperature Silver Solder"
and was 94Pb/6Ag. I have an old chart for this somewhere but can't lay hands
on it right now.
Jeffrey A McGlaughlin, CID
Engineering Designer
Battelle
505 King Ave
Columbus Ohio 43201-2693
Phone (614)424-7582
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Thursday, February 11, 2010 2:24 PM
To: [log in to unmask]
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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