Hi Tony
See: http://www.mcmaster.com/#general-purpose-solder/=sfvdr5
For electrical soldering I use 60-40 which stays plastic for a while,
63-37 which changes from liquid to solid very quick, works OK to add a
joint to 60-40 since it has a lower melting point, I also like the 2%
silver which has a melting point between the two which I use for high
current joints, it's also probably the strongest. I use the 5 flux
core .025" thick. I can solder very thick things with it, just twist
it together (sometimes just keep folding in half a 6 foot length). I
recently soldered some #2 wires with it, works fine. The Silver is the
most expensive, if I could only have one solder, that would be it. My
second choice would be 63-37 although 60-40 works pretty good too.
Keep the tip clean on your soldering Iron, dip it in Flux helps, if you
have some mildly dirty stuff, mildly activated Rosin flux works a
treat.
Ron Parigoris
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