[Al Skierkiewicz]

If you visit the Powerwerx site and search around you will find a variety of documents on the this family of connectors and you will see that there are two types of connctors (high detent and normal) and two types of crimp for each. Choose Wisely. The one style is easily crimped with standard crimpers.
Remember that a good soldered connection is one that is mechanically sound to begin with. A poorly made connection, even one that is soldered has the potential for high resistance (relatively speaking) which means heat. I have seen these contacts get hot enough to melt the plastic holding the contacts in place. This is a domino effect which can only increase the resistance and heat over a short time and yes it might get hot enough to melt solder. Most electronic solder alloys will melt at just over 400 degrees.