It should be wheat bread, which reduces clogging of arteries. LOL.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Monday, April 02, 2012 2:49 PM
To: [log in to unmask]
Subject: Re: [TN] NTC- unmeltable solder

Mother's pride or what kind?
Inge

On 2 April 2012 12:38, Gerald Bogert <[log in to unmask]>wrote:

> 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
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> Blair Hogg      <[log in to unmask]>
>
>
> To
> <[log in to unmask]>
> cc
>
> 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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