I seem to recall being involved in a project where a PEng called for certain connectors to be soldered and crimped. I expect there were specific reasons why that was specified for that particular project. My memory is a bit hazy about the specific details of the connectors.
Re power poles.. I'm not a huge fan of them for my hobby used but I seem to recall commenting re this a few years ago and won't take up any more bandwidth re this. I do own some equipment that uses them, and a number of friends of mine seem quite happy with them for amateur radio use. All the best Mark S m...@alignedsolutions.com 604 762 4099 >> On Oct 5, 2019, at 5:49 AM, jimlux <jim...@earthlink.net> wrote: >> >> On 10/4/19 1:41 PM, Poul-Henning Kamp wrote: >> -------- >> In message <5d979ac0.80...@rogers.com>, MLewis writes: >>> With audio signals, a soldered crimp is one of the worst possible >>> connections. >> Dabbling in audio-homoepathy are we ? >> No, don't bother responding unless you have a reference to peer-reviewed >> scientific documentation for you claim. > > > well.. > https://nepp.nasa.gov/files/27631/NSTD87394A.pdf > > doesn't give why, and doesn't explicitly say "don't crimp and solder" but > does basically say "crimp crimp connectors and solder solder connectors" > > TE "Crimp Theory Fundamentals; Advanced" - explanation of what makes a good > crimp, doesn't discuss solder > https://www.youtube.com/watch?v=bAO9eCS65jw > > There are actually splices designed to be crimped and soldered - but I > suspect their applicability is for specific applications. > > > On Monday, I will try to find one of the connector reliability people for > some references. One challenge is that these practices ("don't solder > crimped connectors") have been around for a long time (at least 70 years), so > there may not be recent published information on it. (recent papers I found > on solder joint reliability are all about PWB connections - esp BGA, CGA, > etc.) > > And, to be honest, materials have changed. > > There is *great* resistance to changing any assembly and workmanship standard > - nobody wants to be the person who says "we don't need to do *that* anymore" > and then a disaster happens, and one of the potential causes is "you didn't > do *that*" > > It is entirely possible that the original rationale and explanation is no > longer valid. > > There is no question that in a vibration environment, solder is deprecated > (it's hard, brittle, work hardens, etc), not to mention all the issues with > RoHS. That said they do use solder joints in high reliability systems - just > with attention to the support of the wire. > > https://www.tandfonline.com/doi/full/10.1080/14686996.2019.1640072 > https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20100029736.pdf > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
