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Date: | Thu, 29 Mar 2012 15:57:08 -0500 |
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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]>
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03/29/2012 12:20 PM
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[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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