tony sayer wrote:
In article , The Natural Philosopher
scribeth thus
tony sayer wrote:
In article , Bill
scribeth thus
In message , tony sayer
writes
In article , Peter Parry
scribeth thus
On Sat, 16 Jul 2011 16:46:53 +0100, "David WE Roberts"
wrote:

As it isn't as snug as I was expecting I am now wondering if I should run
some solder in as well.
With the right tool and matching crimp and cable a crimp connection
will almost always be more secure and reliable than a solder
connection. This is especially so if the joint is exposed to
vibration. Adding solder to a good crimp joint reduces its
reliability.


Why should that be?. Not that you'd what to do both normally;!...
Hi Tony,

If you tin the wire first and then crimp, the solder has a habit of
creeping over time and loosening the joint.

If you solder to the crimp tag then you have a solid firm joint that
with vibration/movement may fracture.

With just a crimp there is a bit more flexibility at the junction of the
cable and crimp.



I'm sure someone will be along in a while to give a better explanation,
I have seen it discussed here before.

Done both overt time and can't recall any failures..
He has it aright. Maybe you have done static installations. I've done a
lot of R/C and a fair bit of mobile kit. Yes, they can and do fail where
the solder stops.

Mobile and static not aircraft tho;!. But apart from this solder wicking
effect which might cause a mech fail if the joint was pulled around
enough, don't seem to be any other failure mode does there?...


crimping soft solder is bad, because it has low elasticity. It ends up
progressively squashing under stress, getting loose and falling out.

the secret is to extend the support to the wire insulation upstream of
the joint in some way. Heatshrink, epoxy resin.... and if you must use
solder, use solder for the whole joint. Don't crimp soldered wire