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Date: | Fri, 03 Jan 97 14:27:34 PST |
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Steve,
You probably already thought of this, but you didn't mention it,
so I thought I would.
1) how many samples is the analysis based on, and is it possible
(especially if it's only based on one sample) that they got it mixed up or
analyzed incorrectly?
2) Have you sent an additional rush sample? I would do that before making
any gigantic adds that may be incorrect.
Good Luck,
Robert Mosebar
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______________________________ Reply Separator _________________________________
Subject: ASSY: Low Tin Level in Wave Solder
Author: [log in to unmask] at corp
Date: 1/3/97 1:39 PM
Good Day Everyone!
We just got our solder analysis back (it's from a lab that everyone uses)
for our wave solder pots, and we have one wave solder pot that's low in Tin...
61.4% to be exact. The recommendation is to add 4.3 lbs. of pure Tin for each
100 lbs. of solder to return it to the nominal 63%.
My question is; just how in tarnation did we get one wave solder pot low on
Tin? It don't make sense...we use the same bar solder in all our machines, we
wave solder basically the same kinds of products in all of our machines. By that
I mean we don't have one line waving only gold plated boards all the time, or
only OSP coated PCB's all the time, etc.. so what gives?
This is the very first time that I've ever had a solder analysis come back
and tell me to put pure Tin into the pot...this is weird. I've had nickel get a
little high before, but that's about it. We've got three machines and all of the
analysis looks like this:
Pot-1 Pot-2 Pot-3
Tin 62.4% 61.4% 62.7%
Lead Balance Balance Balance
Antimony <0.005% <0.005% <0.005%
Copper 0.039% 0.048% 0.033%
Gold 0.017% <0.003% <0.003%
Silver <0.001% <0.001% 0.002%
Aluminum <0.001% <0.001% <0.001%
Arsenic <0.010% <0.010% <0.010%
Bismuth 0.001% 0.001% <0.001%
Cadmium <0.001% <0.001% <0.001%
Indium <0.005% <0.005% <0.005%
Iron <0.003% <0.003% <0.003%
Nickel 0.006% 0.005% 0.004%
Zinc <0.001% <0.001% <0.001%
The analysis was conducted according to specifications in IPC-S-815B. As you can
see, Pot-2 is the "slacker" tin-wise. The only noticable difference that I can
see between the other two is that the copper content is just a tad higher...does
that have anything to do with anything? Looking at the tin content on the other
two pots, they're just barely above the limit which is 62.4%-63.6%...is my bar
solder vendor starting to get tight with the Tin? Any light that anybody can
shed on this would be 'preciated...
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#------.OOOo----oo----oOOO.-----#
# Steve Gregory #
# SMT Process Engineer #
# The SMT Centre Incorporated #
# [log in to unmask] #
#________________Oooo.__________#
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