Dang! I just lost my nearly completed reply on plastic welding!

Here's the kit I have:

http://devildogtools.com/mimo6plwekit.html

I don't remember where I bought it, though.

This is as cheap as it gets--like a fancy soldering iron.

Better ones use hot air. Plastic welding is a complete craft, similar too but different from metal welding. I'm really lousy at it and just a beginner.

If there's an auto body shop you like, talk to them. Plastic welding came to their industy many years ago--with plastic bumpers and panels to reduce weight and maintenance.