Hi,
As Dave indicated, we were busy. I concur with Dave, the solder
microstructure is not the issue. As Dave pointed out
nonuniformity/non-symetricalness of the solder joint shape can result from
the 'disturbance'; I have also observed a weakened zone from the
'disturbance' which caused significantly earlier failures. In my testing
{0<->100C] which typically lasts in excess of 10,000 cycles, the difference
for 'disturbed' SJs can be several thousands of cycles.

Werner Engelmaier

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