Ron Lowe wrote:
On 19/07/2011 11:58, The Natural Philosopher wrote:

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


Right, so we are agreed that soldering ( tinning ) then crimping is bad.

But what about the reverse:
Crimping then soldering?

Strip the wire a tad longer than you might otherwise,
Crimp it normally, but there will be some short excess poking through
the crimp tunnel toward the eyelet.
Apply solder from that end such that it wicks back down toward the
tunnel entrance and around the base of the body. Not too much so that
it flows round the entire eyelet, or even makes an uneven surface for
the screw/washer that will go through the eyelet.

Apart from the creeping problem, soldering a joint raises the stress on
the wire where the solder finishes. That's where it fails under
vibration. It changes the failure mode from a (normally) gradual failure
inside the crimp connector to a relatively sudden failure a short
distance away from the connector.

In my experience, and suchlike......

--
Tciao for Now!

John.