Insulation shrinkage when soldering wire

[Monkeh]

Also, see the preform technique from the Pace videos for consistent solder fill of the cups.

I'll look for them as it's difficult to get a nice fillet on the cups when you are trying to get in and out with the iron real quick

You make them out of solder wire. Twisted wire, cut to fill the cup.

I really recommend watching those Pace videos, relevant ones to this are a couple posts up.

[David_AVD]

I go around to all the pins first and fill them with solder, then tin the wire ends.  Lastly I reflow the solder cup, sliding the tinned wire into place.

It's very easy once you get the hang of it.  After a while you'll just know how much solder to pre-fill the cups with for a given terminal and wire size.   

I would never waste my time twisting solder together they way they show in the Pace video.

[Psi]

Number one thing is iron temp. Do some tests and figure out how low you can go while still soldering quickly.
Usually i solder wine into small connectors at around 300C

Next is the wire type, some brands of wire have more of a problem with melting than others.
Some insulation types (silicon) don't melt at all when soldering and are really awesome to work with.

You will notice that the insulation melts back on the wire noticeably more the first time you apply heat compared to the 2nd time.
It seems to be a 'heatshrink' style property of PVC insulation, once it shrunk a little it doesn't shink as much when re-heated.
Or it maybe due to the insulation deforming/stretching from your wire stripper. The plastic then tries to return to it's initial shape when heated.

So.. pre-tin the wire longer than you need then cut to length after tinning. This also helps because soldering tinned wires is easier/faster which reduces the time in which the insulation may melt.

Hold the wire with sometime close to the joint. (to at as a heatsink). This will reduce the temp rise in the wire leading away from the joint.

Lastly solder as fast as you can while still getting a good joint.

[Stonent]

Use heat shrink tubing to cover it up.

That was my thought as well.

[aroby]

Use heat shrink tubing to cover it up.

Sounds like the electronics equivalent of caulk ...

Anthony

[Stonent]

The end result would be something like this:

[AmmoJammo]