A recent examination of a specimen submitted for examination using the VAX digital microscope disclosed serious lack of penentration of tube metal into the grooves and major discontinuities at the interfaces of the tubes and holes. The following illustrate the unacceptable types of discontinuities.
The picture of the straight tube taken at 500X shows lack of contact between the tube and surrounding tubesheet metal.
The picture of the groove shows that tube metal did not fill the groove or contact the bottom of the groove.
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