I have had good luck crimping the joint and then filling in any open spaces between the wires and between the wire and connector with solder.  Also using a shrink tube adds to the joint protection.  This is what I do for wiring on my sailboat.  In the marine environment we use fully tinned stranded wiring which is a bit more expensive but this is a good method if you want to never worry about it again.

I would think either crimping or soldering done correctly and with the proper materials for the job would be satisfactory.

Larry

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