[Boatanchors] Solder

[Garey Barrell]

'Eutectic' also means that it goes directly from liquid to solid as it cools, with no 
intermediate 'plastic' state.

It is also the lowest possible melting point for a Tin-Lead solder.

'Silver Bearing', (NOT 'Silver') Solder subs 2% Silver in place of 1% each of the Tin and Lead, 
which prevents the Silver from surface mount parts that have silver sputtering on the contacts 
from leaching into the Lead.  Early on there were lots of failures with 63/37 where the silver 
leached out, breaking the electrical contact.

73, Garey - K4OAH
Rome, GA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>

D C _Mac_ Macdonald wrote:
> 63/37 is "eutectic" solder.  That means it melts at the lowest possible temperature with those two components.
>   
> It matters if you are on circuit boards and with highly heat sensitive components.
>    
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * k2gkk hotmail com *
> * Oklahoma City, OK *
> * USAF & FAA (Ret.) *
> * * * * * * * * * * *
>   
>
>   
>> Date: Sun, 10 May 2015 14:36:44 -0500
>> From: ranchorobbo at gmail.com
>> To: peterl at standingwave.org
>> CC: boatanchors at mailman.qth.net; krkaplan at cox.net
>> Subject: Re: [Boatanchors] Solder
>>
>> I'm having trouble understanding how 3% can matter.
>>
>> Rob
>> K5UJ
>>>> I think you will ultimately be happiest with 63/37 rosin core in the diameter of your choice ( I use .030"). I gave up on 60/40 years ago
>>