Glass/epoxy or carbon fiber/epoxy materials are common for
this type of application.  However ceramic fixtures are
better fit.  They require minimum wavesoldering parameter
adjustments to get good soldering results.

You may need to have a separate operating parameter log for
this type of selective soldering.  Depending upon your
wavesoldering machine performance and product
requirement:
- Increase preheat temp
- Reduce board speed ( 1m/min??)
- May require wavesoldering height adjustment.
- Locking mechanism might be needed to secure boards in
place.
- Increase flow soldering depth (Lambda wave for Eletrovert
machines) by adjusting the back plate in the pot.

A dual wave machine performs better than a single wave.
Maintain a good soldering level in the pot as a traveling
fixture (board) in the conveyor tends to displace a large
amount of flowing solder.

Contact ECM (215-340-0650).  It can provide you tech tips
and custom fixtures

Regards
Matthew Park
Norsat International Inc.  BC.



>>> "Blanchet,Richard" <[log in to unmask]>
December 11, 1997  2:20 pm >>>
Hello,

I'd be interested in learning about anybody's experience with
selective
soldering done on a full-size wave soldering machine. I'd like
to know what
materials you guys use to cover the solder bath or the PCB
itself, as well
as things to pay special attention to, tricks, tips, etc.

You can respond to me through technet or directly. Thank
you.

Richard Blanchet
Manufacturing Engineer
Canadian Marconi
[log in to unmask]

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