); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Brooke,
Thanks Bruce for the quick response, as always. In my business, we typically dissolve the gold by dipping the solder cup in a hot tin pot, which is replaced regularly, before soldering the wires. This has been blessed by the major defense contractors for military applications. Failure to do this typically results in weakening solder joints over time, and delayed failures, particularly when there is mechanical and/or thermal stress applied to the joint. Didier KO4BB -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dr Bruce Griffiths Sent: Monday, July 23, 2007 9:29 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 5370B low frequency modulation Brooke Clarke wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] .com > > Hi Didier: > > Would you elaborate on the comment "Gold plated connectors are a well known > example." Do you mean when soldered with Lead Tin solder instead of a silver > bearing solder or something else? > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.precisionclock.com > > > > Didier Juges wrote: > >> ); SAEximRunCond expanded to false >> Errors-To: [EMAIL PROTECTED] >> >> I have seen cold solder joints on thermal fuses and certain types of >> capacitors, while the rest of the instrument was fine with no sign of >> corrosion. >> >> I think it has to do with the metal used for certain component leads. Either >> they were never soldered well, or interface corrosion developed over time. >> >> Gold plated connectors are a well known example. >> >> Didier KO4BB >> Brooke Gold dissolves in the solder and a gold -tin intermetallic compound is formed which severely reduces the joint integrity and ductility. This can be circumvented by keeping the gold concentration in the solder below 4%. Tin plating over the gold before soldering is sometimes used to ensure this. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
