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
     [log in to unmask]
     


______________________________ Reply Separator _________________________________
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
[log in to unmask]
     
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