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Old 10-12-2019, 10:13 PM   #18
DDW
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City: San Francisco
Country: USA
Join Date: Apr 2018
Posts: 957
Quote:
Originally Posted by psneeld View Post
True the NASA standard does note solid conductors. But ABYC doesn't speak of prohibitions, just meeting standards.


So the question remains, even on stranded wire, if it meets the pull and support test, and is a mechanical connection in addition to soldering...does it not meet ABYC standards?


Aren't different methods allowed and that's why they "don't" specify a particular method?
I haven't seen the report mentioned, but the ABYC beef with soldered connections is partially stress relief. In a soldered connection on tinned wire, it is difficult or impossible to control where the fusing stops. The wire is already tinned and will fuse just by bringing it to the melting point, no additional solder required. Usually on multi strand tinned, it you solder in one place the wire will be stiff some distance from the actual joint. This can make the wire flex (due to movement, vibration, etc) in a very limited length at an unpredictable location, and copper being a work hardening material, it is likely to fail there. If you can manage a soldered connection with an addition mechanical strain relief, then it should be as good as a crimped connection.

Of course crimped connections are not immune from work hardening failure, but with good terminals there is a softer flex area and the location is predicable.
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