[Elecraft] Solder Size and Flux (WAS: K2 build question)

[Ron D'Eau Claire]

One of ways builders get excess flux on the joints is by using too-large
diameter solder. Such solders tend to release more flux per unit of solder
than smaller-diameter solders. 

The biggest solder I use on through-hole work is 0.031" diameter, and I have
0.015" solder for small work. 

Ron AC7AC 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Thursday, June 12, 2008 10:15 AM
To: Michael Harvey
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K2 build question


Mike and all,

Flux residue will do no harm except under quite unusual circumstances 
and it is best left as-is.  The greatest 'problem' is one of aesthetics.
Attempts to remove flux can result in damage to components - the cleaner 
can get into relays, inductors and cause much more harm that.  For that 
reason, Elecraft strongly recommends that flux *not* be removed.  If you 
feel you must do flux removal, do not flood the board or even spray it.  
Work in small areas at a time with Q-tips or something similar.

If your solder has a mildly reactive flux, and you do not apply excess 
solder, there is no need to remove any of the flux - the board will look 
clean.  I would suggest that if you have excessive flux residue on your 
board, then you likely have too much solder applied as well.  It would 
be better to wick away the excess solder than to clean off the flux - 
the excess solder can create solder bridges and can hide a connection 
that did not receive enough heat.

73,
Don W3FPR