Dave Plowman (News) wrote:
No. ;-) The heat required for these will weaken the cable - or loose the
flexibility. All that's required is to splay out the strands at the nipple
and stop them pulling through. The shear strength of soft solder more than
matches a 'solderless' nipple of the type which relies on friction.

Solderless nipples.... the screw-on type. Dangerous for anything
critical IME. You can get cables to solder better by unravelling
the end 1 1/2" (not straining the individual wires!), cleaning,
and re-winding them before trying to solder.