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Re: Small Void/Inclusion detection

Posted by: Joachim Bamberg , E-mail: 106006.1120@compuserve.com, on May 27, 1997 at 10:44:27:

In Reply to: Small Void/Inclusion detection posted by : Gerald Feldewerth on May 23, 1997 at 20:21:21:

: Are standards and techniques available to detect very small voids or inclusions in pure metals using standard C-scan equipment?? The size I am trying to detect is 0.05 to 0.1mm. If this can be accomplished can anyone tell me where I can get flat bottom holes made to use for calibration standards.

: Thanks
: Gerald

Hi Gerald!

I think we can help you. We (MTU-München) have a
special drilling machine in our lab for producing flat
bottom holes of size 1.6 to 0.05 mm diameter in super-
alloys. The depth is about seven times diameter. Deeper
holes are possible by setting greater holes at first
and making the desired tip thereafter inside the hole.

My colleague Wolf-Dieter Feist produced a lot of
calibration standards by this way.

25 MHz focused transducers are sufficient for the
detection of these artificial defects
(in the case of low attenuating alloys!).

For more information please contact us.

Grettings
Joachim

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