Wheelhouse is a newsletter for makers that covers new materials, techniques, and tools. Crimping vs Soldering Those that come from an electronics background are used to soldering parts. However, in high vibration environments, crimping is superior. It turns out that the stiffening of the wire due to capillary action of the solder actually can cause the connection to fail.
I used the heat-shrink butt-splices to repair a couple of strings of outdoor christmas lights last year. Worked fine for the month and half they were up.