When I've run into that problem is always turns out that I think the water 
is off and there is a trickle that pulls off enough heat to prevent solder 
melt.  Did they use another type of solder?  Some smart guys use Silver 
solder and map gas or acetylene.

Chuck


Charles W. Brummer | 3M Manufacturing Engineer
3M Electronic Solutions Division
3M Canoga Park, 8357 Canoga Ave. | Canoga Park, CA 91304
Office: 818 734 4930
[log in to unmask] | www.3M.com


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From:
Blair Hogg <[log in to unmask]>
To:
<[log in to unmask]>
Date:
03/29/2012 10:20 AM
Subject:
[TN] NTC- unmeltable solder
Sent by:
TechNet <[log in to unmask]>



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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