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Originally Posted by sanddrag
I'm worried that in this case all you have done is created a "blob" (for lack of a better term) of solder. A good solder joint is a hot one, and hot solder joints happen quickly. You may have just filled in the gaps without providing any increase in mechanical or electrical integrity.
I have a question, assuming you only screw down the lug, do you get a better connection on more finely stranded wire? Like good welding cable as opposed to the junk battery cable they give us?
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If the solder flows through the wire and joint you have a good solder connection. Someone practiced at soldering will know what good solder flow looks like. I would not try to solder the SLU-70 lugs with a 25 watt iron, however.
We use #6 welding cable for our power wiring for its flexibility and high quality rubber insulation. The problem with this cable on the SLU-70 lugs is that the wire is fine enough to work its way through gaps in the clamping mechanism. You can end up with a connection that loosens. Solder the connector after clamping the wire it in order to remove this possibility. I would never use the SLU-70 lugs without soldering them.