Hi Cathy! I recommend you investigate the possibility that the plated thru
holes in your boards has breaks/voids in the copper plating - many times
blowholes/pinholes are due to the wave solder process volatilizing trapped
"stuff" in plated thru hole wall breaks.  Also remember that baking will
impact the solderability of your pwbs - usually negatively. Good Luck.

Dave Hillman
Rockwell Collins
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Cathy Killen <[log in to unmask]>@ipc.org> on 02/05/2002 04:03:38 AM

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Subject:  [TN] Baking Boards


Hi,
Is there a procedure on baking boards. Do you bake them after a certain
shelf life or do you automatically bake them? We are finding blow holes
randomly on some boards. The boards are all from the same shipment and same
date codes. If there is a procedure does it cover baking times and
temperatures etc?


Cathy Killen
Training Instructor
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