ah no. Do not solder crimp connectors. If you are having to do this to get reliable connections you either do not know what you are doing and/or are using the wrong connectors and crimp tools. Soldering is much less reliable that *well* done crimps and soldering a crimp connector causes issues including solder flow back up the stranded wire making that brittle. Look up any proper instructions for doing professional crimping and this will be made very clear, or get help from a skilled professional and they should kick you out in your arse for such sloppiness.

A properly done crimp connection is a cold-weld joint done under incredible pressure. You will only do these reliably with the right connector and wire guage and a ratcheting or power driven (e.g. As used in manufacturing) swage crimper. Matching the exact manufacturer connector to the crimp tool or replaceable head may be needed to get really good crimps. And in some cases that crimper may cost hundreds of dollars.