How to do a Western Union Splice
by delugesThis is the solder splice that offers the least resistance I've ever found :
less than a hundred micro ohms! 
My Ohmmeter doesn't read less than that, so I'm happy with it.
It's quite easy to do and offers great mechanical resistance for virtually no electrical resistance.
First you want to remove a good 5 cm (2 inches) of insulant on the wires, then twist them on themselves to make a single thick brand.
There's a great scheme here that came from wikipedia and sums up the following:
1) Fold in the middle and give one or two turns
2) Wrap tightly around the other wire using pliers or your fingers if you feel strong today 
Several Pictures at link: 
http://www.instructables.com/id/How-to-Do-a-Western-Union-Splice/
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