Alternative to soldering?

[pinkpanda3310]

I've rewound a brushless motor stator, this time using larger gauge wire, but when I try to solder it to the esc wires I cannot heat the 1.4mm wire enough to melt the solder.

I know my soldering is poor at best so I was wondering if I could use crimps?

Any suggestions on solder or crimps would be appreciated.