Lou,
I agree with you. I don't deal with wave soldering, but with HASL, and I
know from experience that a LOT can happen to solder composition in a few
months, much less six, and I would guess that that's probably just as true
with wave solder. I would stick with what you're doing. Our solder supplier
does the monthly analysis for us at no charge (I suppose it's included in
the price of the solder). Yours should too.
Tim Reeves
ECD

-----Original Message-----
From: Lou Hart [mailto:[log in to unmask]]
Sent: Wednesday, July 11, 2001 6:54 AM
Subject: Wave solder pot analysis


TechNetters, I'd appreciate comments on contaminant analysis of a wave
solder pot.  We had been sending a sample out for analysis (type "C" I
think it is, by the mil spec) once per month.  Now the solder supplier is
telling me that once every six months is more than enough.  I've been
taking the contaminant data and plotting Q charts (for short-run SPC the
modern way, as I've been mentioning in this forum) with the monthly data.
 What has been your practice and recommendation?

At the moment, it is hard for me to feel comfortable with a twice-yearly
analysis of what seems to me to be an important material in our
manufacturing process.  Lou Hart

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