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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