Homebrew PCBs

> Some plastics, such as acrylic and polycarbonate will burn in air
> before reaching melting temperature. I don't know if they can be
> welded with hot air, but rather nitrogen might be needed.
> Nitrogen gas welding is not practical the hobbyist so I would
> stay with PVC. You can try hot air welding on some scrap PP to
> get familiar with, but I don't know how difficult PP is to work
> with. It took me many number of hours of practicing on scrap
> pieces before I could weld up tank.
>
>
>

Thanks for all the tips, i will try again more seriously with the round 
nozzle.
The very absurd thing is that i should have learned plastic welding in the 
school i was.
for some very stupid, and very unknown to me, reason they cancelled the 
plastic course in
my year. There was so much stupid things we were made to waste time with 
and they did not
think that is important for electrical engineers (No idea how they got 
that impression).
I did learn metal welding there, which is kind of funny as it is just as 
likely to be
needed as plastic welding, i do not say the metal welding was one of the 
useless things,
but there WERE really useless things... I really regret i didn't learn it 
then...
(Wasting school material is always better when learning things, and 
instructions are not bad..)

So, i have to figure it out on my own now i think.

Thanks for the hints, i will ask again if problems occur..

ST