[Boatanchors] Boatanchors Digest, Vol 64, Issue 34

[Jim Liles]

Hi Sandy:
A very good solder is Kester 63/37 --- "44" Rosin core and here's why. 
First Eutectic solder (63/37) sets, DOES NOT puddle in a jelly state setting 
slowly.  Many years ago ATT, IBM, and others found that solder joints began 
to fail after 10 or so years.  The solder was the common 60/40 
composition --- not Eutectic.  The joints seemed to have gone to high 
resistance or separate.  The cause was determined to be that the 60/40 
alloys set at different temperatures resulting in a jillion microscopic 
connections each vulnerable to failure because of high current or skin 
effect whereas Eutectic alloys 63/37 set at the same temperature resulting 
in a single connection.  A common belief that solder joints in high power 
amplifiers will fail within a decade is true if non Eutectic solder was 
used.  As for the resin, the low residue or easy to remove versions are 
@#$%^&*.  That said, use 63/37 "44" and you will be happy.  Hope that helps. 
Be a pleasure to hear other opinions --- Please, no juvenile sarcastic 
comments.  --- Kindest regards Jim K9AXN




Original message:
>
> Message: 2
> Date: Tue, 26 May 2009 11:38:01 -0500
> From: "Sandy" <ebjr37 at charter.net>
> Subject: [Boatanchors] Multicore solder specifications?
> To: "Glowbugs reflector" <glowbugs at piobaire.mines.uidaho.edu>,
> "Elecraft List" <Elecraft at mailman.qth.net>,
> <boatanchors at mailman.qth.net>
> Message-ID: <A8A10B764C6E42CDA58AAC2716C87349 at gateway>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> I have a pound spool of Mulicore solder I'm looking for info on!  It 
> smells
> odd when used and the flux doesn't work too well.  Numbers on end of spool
> below:
>
> Sn63    X32B, 21 swg guage
>
> then numbers: D973/815
>
> Anybody have any clues?
>
> 73,
>
> Sandy W5TVW