amith,

There was a very good article on dross in the October 1998 issue of SMT
written by Ralph Woodgate. I think this would answer many of your questions.

Ken Bloomquist
PRIMEX Aerospace Company
www.primextech.com

At 08:04 PM 11/3/98 PST, you wrote:
>Hello All,
>
>I am posting this on behalf of my friend.
>
>I have seen lot of Dross formation every time I power ON the Wave
>soldering machine. Though I use dross reducing powder, still lot of
>dross gets formed. What are all the Major factors affecting this ?
>If it is Solder impurities , what are those ?
>How do I control this Excessive dross formation ?
>
>{ Every time I need to add lots of fresh solder bar to maintain the
>solder level in the solde bath. )
>
>thanks in advance
>amith
>
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