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 > > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud > service. > For more information please contact helpdesk at x2960 or > [log in to unmask] > ______________________________________________________________________ > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or > [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________