Hello Technetters

        Recently with the help of a high end piece of x-ray equipment we
have noticed voids in the spheres of the bga after reflow, "see
attachment-file".  Has anyone seen this before, or has any idea how the
voids are created?  Also does anyone know if this is a bad or good thing?
Does anyone have any recommendations to the profile?


Thanks
        Bob Perkins
        Automation Technician/Manufacturing Engineer
        Aimtronics
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