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Date: | Sat, 24 Feb 2007 14:22:26 EST |
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Hello John,
Sorry to learn of your troubles but it sounds like you have a good sense of
the issues. The devil is in the details and there is need to withhold
judgment until all of the factors are know. Lots of questions need to be asked and
answered before you can get to an accurate understanding and diagnosis.
There are many folks in this forum who have experienced your pain and can
offer some comments once the microsections are done and viewable. Werner
Englemaier has made such issues his life's work and I am confident he will have
some sage and valuable advice.
The microsections will tell likely the tale but the short answer to your
question on plating is: Yes, plating thickness, coverage, quality and ductility
can all have marked effect on both robustness and reliability and crack
location is an indicator.
With respect to the assembler you will want to know if there is there an
accurate and verifiable record of the processing parameters used. It may are may
not be part of the problem but it is a prospective piece of the puzzle.
Good luck
Joe
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