Hi Scott,

In addition to helping reduce oxidation in general, the main advantage
of using nitrogen in either wave or reflow processes is that it helps
promote wetting of lead free solder. Because lead free solders do not
wet as well as SnPb solder, it is often necessary to increase the peak
reflow or solder pot temperatures. Nitrogen may allow you to decrease
this peak temperature, thereby providing a cost saving that may offset
the cost of using N2.

Todd MacFadden
Toxics Use Reduction Institute
Univ. Massachusetts Lowell
978.934.3391
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----- Original Message -----
From: Scott Lefebvre <[log in to unmask]>
Date: Friday, February 27, 2004 1:25 pm
Subject: [LF] Use Nitrogen or Not!

> I am looking at upgrading our Reflow and Wave Solder equipment for
> Pb free.  I wanted to know what the consensus is for the
> requirement of Nitrogen for these two systems. It seems to depend
> on who you ask some say you will need Nitrogen and others say no.
>
> Thanks,
>
> Scott Lefebvre
>
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