Which of the following NDT methods requires that the surface of the test piece is cleaned down to bare metal?
- Eddy Current.
- Magnetic Particle.
- Dye-penetrant.
Explanation from PART66Online
Dye penetrant relies on the dye entering surface-breaking defects, so the test surface must be cleaned down to bare metal with no paint, plating or coating that could bridge over and hide the openings. Eddy current and magnetic particle can tolerate thin coatings and do not require removal down to bare metal in the same way.
K
keithanddave asked · 21 May 2013
Why is this not eddy current?
Community Comments (2)
T
trap2307
21 May 2013
Hello!
Because Eddy current method is only for detecting internal cracks of material. But before using the Dye-penetrant method, the surface should be cleaned.
Because Eddy current method is only for detecting internal cracks of material. But before using the Dye-penetrant method, the surface should be cleaned.
B
bragithor
27 Apr 2015
The removal of paint is not always required in Dye-Penetrant testing
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