Dye-penetrant testing, detecting cracks in metals, non-destructive test material/DP test?
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Ali Asharaf Khan
S Dye-penetrant testing, detecting cracks in metals, non-destructive test material/DP test?
I would request to be known what is non-destructive test material, it is also called DP test. Is Dye penetrant testing the non destructive test material and why is it called non destructive test material? Are there any alternatives to the dye penetrant testing? What is the advantages of dye penetrant testing over other testing for detecting cracks in metals? Is the production of dye penetrant material a profitable business. Kindly also let me know how many kinds of these dye testing material are there? Kindly aslo guide me through the phases of dyes testing. Kindly guide me as I want to puchase a plant producing this dye penetrant testing material. Thanks.
Answer:
Non-destructive testing (NDT) involves the examination of an object in any manner that will not impair its future usefulness.
Major NDT methods include:
Visual
Dye Penetrant
Ultrasonic
X-ray (radiography)
Thermographic
Acoustic Emission
Eddy Current
Shearography
Magnetic particle,
NDT is used in a variety of industries including aerospace, petro-chemical, automotive, metals, non-metals, nuclear, marine, electronics, construction, aircraft, materials joining, and utilities. http://www.slcc.edu/aos/academic_program...
Liquid dye penetrant inspection is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). http://en.wikipedia.org/wiki/dye_penetra...
The basic stages of liquid penetrant inspection:
1st, the surface to be inspected is cleaned thoroughly to remove all traces of dirt and grease.
2nd, brightly coloured or fluorescent liquid is then applied liberally to the component surface and allowed to penetrate any surface-breaking cracks or cavities.
3rd, The liquid is allowed to soak into the material's surface is normally about 20 minutes.
4th excess liquid penetrant is wiped from the surface
5th a developer applied. The developer is usually a dry white powder, which draws penetrant out of any cracks by reverse capillary action to produce indications on the surface.
6th, coloured indications are broader than the actual flaw and are therefore more easily visible. http://www.twi.co.uk/j32k/protected/band...
That's a lot. Better refer online encyclopedias.
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