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Date: | Thu, 19 Dec 96 06:38:30 cst |
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Good Morning Ken -
I have seen CCAs run through our wave solder that exhibit the same
type of thing you've described but ours were more toward the purple
side of the spectrum. I spent a bunch of time trying to find an
assignable cause but never did. The testing I did showed that the
solder joints had a bit more oxide than normal. I finally concluded
that it was an oxide appearance issue and no reliability problems
existed. Chalk it up as one more reason for not using visual
inspection to gauge solder joint reliability (that shiny solder joint
culture, bah humbug!).
Dave Hillman
Rockwell Collins
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Subject: Dross on CCA
Author: [log in to unmask] at ccmgw1
Date: 12/18/96 10:32 AM
We have a couple of boards that came out of the wave solder machine with the
solder joints looking like dross, i.e. gold, purple, etc. The solder joints
look good and this discoloration is only on the bottom of the CCA. CCA's
flowed prior to and after these looked ok.
My question is, does this present a real problem or is it a process
indicator? This is for a high reliability DOD program.
Thanks in advance for all responses.
Ken Bloomquist
Olin Aerospace Company
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