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If you are just shoving the wire into a pool of soder you are making a bad conection. You have to heat the wire and the conector to get the soder joint to be good otherwise its a cold soder joint and has not electricaly bonded to the lug and the wire. it will take some practice but the soder should wick into the wire once everything is warm, and you should be able to do this with out seriously damaging the wire insulation, and thats a good use of heat shrink after the joint is done. I would still do it with a torch but not to directly, its closer to a braising technique if you have some one that is a pipe fitter near by. The joints that I have seen fail the wire melted the soder and the wire fell out of the lug.
If you are just shoving the wire into a pool of soder you are making a bad conection. You have to heat the wire and the conector to get the soder joint to be good otherwise its a cold soder joint and has not electricaly bonded to the lug and the wire.
it will take some practice but the soder should wick into the wire once everything is warm, and you should be able to do this with out seriously damaging the wire insulation, and thats a good use of heat shrink after the joint is done. I would still do it with a torch but not to directly, its closer to a braising technique if you have some one that is a pipe fitter near by.
The joints that I have seen fail the wire melted the soder and the wire fell out of the lug.