On 10/4/19 1:41 PM, Poul-Henning Kamp wrote:
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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no longer valid.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
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