April 2, 2012

The problem may not have anything to do with the solder used. The pipe
could have some water remaining in it or a valve upstream of where you
are soldering could have small leak.  Any amount of water leak can make
it difficult if not impossible to make a solder joint.  Old plumbers
trick by putting small piece of bread into the pipe may stop the leak
long enough to make the solder joint.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Thursday, March 29, 2012 4:57 PM
To: [log in to unmask]
Subject: Re: [TN] NTC- unmeltable solder

Hi Blair - one other possible reason but lower on the possibility scale
is that the solder joint, if old enough, had converted itself into a
tin/copper joint rather than copper and solder joint. Most solders
contain a low melting element - i.e. lead, bismuth, etc. - so the solder
joints should go molten but if you had a high tin alloy with minimal
lower melting point element addition, you would be trying to "melt"
copper/tin intermetallic which isn't going to happen.  Mike's or Chuck's
responses are more probable explanations for what you experienced.

Dave



Blair Hogg <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
03/29/2012 12:20 PM
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Subject
[TN] NTC- unmeltable solder






The recent discussions on rework issues reminded me of a while back
where 
I needed to repair a leaky water pipe in my home. Took a chunk of the 
ceiling out, got out the plumbers torch, drained the pipes and started
to 
heat. No matter what I did to the joint that was leaking I could not get

anything to melt. Had to cut the pipe on either side of the elbow joint 
and patch in a new section. Even afer I took it out I could not get it 
apart. Not sure what happened to the solder but something changed it to 
make it unmeltable. 

Blair



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