Has anyone used these?
Heat Shrink Solder Connectors
Carl
Original Post
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Overpriced answer to a question that should have never been asked. 
Good for underwater layouts.
John
I have found them to be helpful for smaller wires to extend the leads such as for building lighting, especially LED’s with small gauge wires and switch machines.
Bob
I wanted to use them on 28 AWG LED wires. I don't want to crimp small wires. The small heat shrink solder connectors are $0.0426 per connector taxes and shipping included at Aliexpress. Which is acceptable to me for the LED wires.
@carl552 posted:Has anyone used these?
Carl,
As Bob G said above, these work great especially connecting small wires together. On repair jobs I previously used to solder two wires together and then have to slide heat shrinkable tubing over the connection. With these solder splices it's one simple step to slide the two stripped wire ends into the tube and then use a heat gun to melt the solder. For example, a few weeks ago I needed to connect the thin wires from a wall-wart with the thin wires from a molded power connector. These solder splices made the job easy and ensured the splices were completely sealed.
Thought I’d add a suggestion as well. To make handling easier during the job, I use regular pliers to lightly crimp the the solder joint enough to hold the wires in place before applying heat.
Bob
To splice two wires I tin both sides, and then apply heat to solder them together. I keep heatshrink from 1/16" and up on hand, and I can make very compact splices in finer wires.
John, that’s what I used to do as well. Just found this to be more convenient and faster for me.
Bob, if it works for you, that's all that really matters!
I’ve just used them for making connections on my boat trailer when I converted the bulbs to LED’s, and wanted to keep everything waterproof. Simple to use for sure.
@JohnActon posted:Do they have flux in the solder ? What kind ? I would also be concerned with cold joints. j
John,
I don't know about the type of solder used but it melts beautifully with just a heat gun to provide a well-formed shiny, bright finish. I have no fears of a cold joint given enough heat. One brand of these shrink solder connectors now has 27,000 reviews on Amazon so this product is certainly gaining in popularity. I first starting seeing them used in amateur radio and marine applications a few years ago. Suggest getting a few of them, in different sizes and give them a try yourself. You just need a heat gun. I got mine on sale from Harbor Freight for about $12.
I'm guessing that it's bismuth solder being used in these connectors. Should work fine as long as it completely melts.
Yes I have been using them and find they work well and I just heat them with my heat gun and it only takes a minute faster than standard soldering for me anyway.
@carl552 posted:Has anyone used these?
Heat Shrink Solder Connectors
Carl
use them all the time. It's one of the best ways we splice wires in aircraft next to crimp splices.
Depending on the wire insulation be careful you don't melt the insulation.
The solder used in these is obviously low temperature alloy or the heat gun would never melt it through the insulation. That might not be an issue most of the time, but I'm sure in mission critical situations it may not be desirable.
I'll stick to real 63/37 Rosin Core solder and heatshrink tubing. 
