We had similar problems and questions to yours about 2 1/2 years ago. We
could not find any facts or users of "Marbles" to reduce dross. I then
had stainless steel covers made which float on the solder in
configurations to mate up with the solder pot and all items entering and
exiting the solder surface. The covers have limited the oxygen to the
pot and have minimized dross buildup. The first eight week after
installation we did solder contamination testing with no unusual
contamination showing. We then dropped back to monthly checks and have
not had any problems.
Good luck and I hope this helps.
Semper Fi
Tom

>----------
>From:  Art G. Pauly[SMTP:[log in to unmask]]
>Sent:  Wednesday, October 29, 1997 5:13 AM
>To:    [log in to unmask]
>Subject:       [TN] WAVE SOLDER DROSS & MARBLES
>
>I have been having problems with excessive dross build-up in our wave
>solder machine.
>We are considering adding marbles to the solder pot.  I_ve heard
>conflicting advice on whether or not this is a good idea.  I have heard
>that it may keep the dross down, but it may also increase the
>contamination levels.  Does a dross layer over the marbles protect the
>solder from contamination?  DOES ANYONE HAVE ANY ADVICE ABOUT DROSS &
>MARBLES?
>
>
> -Art Pauly
>*******************************************
>       Art Pauly ([log in to unmask])
>       Manufacturing Process Engineer
>    Kistler Instrument Corporation, USA
>  Phone: (716)691-5100 Fax: (716)691-5226
>  World Wide Web  http://www.kistler.com
>*******************************************
>
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