Please send a more detailed description of the "splashes" - where are 
     they on the assembly, what they look like, etc.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]
     


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Subject: PCB Assy-Wave Solder
Author:  [log in to unmask] at ccmgw1
Date:    6/17/96 11:37 AM


Presently we are seeing accurrances of solder splashes in our wave solder 
process. We have PCB's that are less then three months old and our storage 
process is inside of a ziplock bag with desiccant. Our present environment 
has a higher than normal humidity level of 40 to 50%.  We have attempted 
many adjustments to the proces such as speed, flux gravity(foamer), etc.. 
The only thing that appears to eliminate or reduce the splashes is baking 
the assembly for 1 hour at 50 degrees 'C' and doing the wave process while 
the assembly is still hot. 
     
Does anyone out there have any ideas of what could cause this problem or 
things we should try that could eliminate them?
     
Thanks in advance