Plastic welding

[David Cavanaugh <cavanadd@kendra.com>]

Horrible Freight had their plastic welders on sale this week, so I got 
one.  I seem to recall a thread or post a few weeks ago about using a 
router speed control to control the heat for better welding.  Anyone save 
it or remember the details?  IIRC there was a considerable amount in the 
post/thread concerning plastic welding, but unfortunately I didn't save any 
of it.  Any links to plastic welding FAQ or procedure sites would also be 
welcome.

Thanks
Dave C