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Circuit Board Design Class
A little flux goes a long way. Even an inline parallel splice (much cleaner, less bulky and ugly) with proper solder flow, can be effectively as strong as this one. Note: if you're putting enough tension on the wire to separate your solder joint before the wire gives way, you likely didn't have very good solder flow. However, perhaps the point to make here is your wire/solder should never bear a load great enough to separate either.