A few people have asked if I can take a look at these quick-repair connectors for cars and other applications.
The idea is that you can basically put the stripped ends of two wires into one of these connectors and when heated it solders the wires together, while also providing a waterproof seal with heat shrink sleeve and hot melt rings.
Note that wires should be shiny copper or tinned copper for any soldered connection to work properly. If the wire is oxidised, black and tarnished then it will not always readily take solder even with flux. In that instance it may be necessary to cut back either side to see if you can find clean copper and patch a new bit of wire in.
The word of the day is "smoosh". A special word mechanics use for smooshing things together.
Here's a typical eBay search link for these things:-
https://www.ebay.com/sch/i.html?_from=R40&_nkw=car+solder+heat+shrink&_sacat=0&LH_BIN=1&_sop=15
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http://www.bigclive.com/coffee.htm
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14 thoughts on “Heat shrink solder butt connector test.”
  1. Avataaar/Circle Created with python_avatars TheBlueCoyote says:

    I used these in repairing a headlight of my wife's car. they held on perfectly despite the hot temps of the headlight running.

  2. Avataaar/Circle Created with python_avatars Sarch Lalaith says:

    Given the hardness and low temperature I'd not mind betting it's an alloy of one of the bismuth, cadmium metals

  3. Avataaar/Circle Created with python_avatars djfromla says:

    maybe flux the wires beforhand? perhaps it would flow better?

  4. Avataaar/Circle Created with python_avatars Gary Brown says:

    Better than scotchloks, but I haven't had 100% reliability. Good crimp or old fashion soldering for me.

  5. Avataaar/Circle Created with python_avatars Gary Brewer says:

    These work fine if you use them as designed/intended.
    Too much stripped wire cause too much spread of the solder, only strip 1½ – 2 times the width of the solder ring.
    Make sure to use the correct diameter splice, too loose and the solder and wire starts to oxidize before contacting the wire risking a "cold solder joint'.
    Heatshrink 101 – never use a naked flame, unless you have no other choice.
    Only specialized forms of heatshrink are designed for use with naked flame/blowtorches.

  6. Avataaar/Circle Created with python_avatars Julio R says:

    Avionics SHOPS and ME uses these Solder BUTTS for wiring Aircraft radios and all Elctrical and Electrinics NAV equipments like GARMIN G1000 Garmin GX 750 etc Looks oyu have not much Electronics expertise Having Boubts of a product used in the Aircrafts Industries and Avionics Installers WORLDWIDE

  7. Avataaar/Circle Created with python_avatars SuperHighMe420 Weeds says:

    hey are these any better then using electrical tape ?

  8. Avataaar/Circle Created with python_avatars 15 DurangoRT says:

    So what was the original brand name of the first company that came out with these type of connectors?

  9. Avataaar/Circle Created with python_avatars Chris Sims says:

    is it ok if some of the adhesive contacts the copper wire?

  10. Avataaar/Circle Created with python_avatars darrengilles darrengilles says:

    This is a stupid video proper testing would have been a pull test and an amperage test ,,,,,,,,,,,,,,,,,FAIL

  11. Avataaar/Circle Created with python_avatars Hola! Charl Heynike says:

    I found that the solder didn't bond well with the copper. If you pull the wires apart the solder comes off cleanly.

  12. Avataaar/Circle Created with python_avatars Adam Catt says:

    I used to use these in the Navy back in the 90s. They were referred to as environmental splices as they created a sealed, soldered connection for splicing. Standard heat shrink doesn't have that 'environment proof' characteristic.

  13. Avataaar/Circle Created with python_avatars BigBaza82 says:

    You get little heat shields that slip on the end of the hit air gun. So you get even heat around. I use a Weller heat gun at work to do this.

  14. Avataaar/Circle Created with python_avatars Omnivorous1One says:

    Would you recommend these or the crimp type more?

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