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April 2012

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From:
Robert Kondner <[log in to unmask]>
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Date:
Mon, 2 Apr 2012 15:56:03 -0400
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For electronics does the bread need to be lead free?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Monday, April 02, 2012 3:49 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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