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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.
2007-07-18 04:21:56 · 4 answers · asked by Alloy 1 in Science & Mathematics ➔ Chemistry
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_programs/Non-Destructive_Testing_Technology.pdf
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_penetrant_inspection
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_3/ksijm001.html
2007-07-22 18:13:31 · answer #1 · answered by Metallic stuff 7 · 1⤊ 0⤋
Why is it called non destructive test material? It is called "non destructive test material" or NDT Material because during the examination, application and removal of the dye no change is made to inspection site. Are there any alternatives to the dye penetrate testing? Ultrasonic or Eddy Current come to mind What is the advantages of dye penetrate testing over other testing for detecting cracks in metals? Depending on they testing agent used, a visible indicator of the flaw can be seen without the need for auxiliary visual aids. Is the production of dye penetrate material a profitable business? -unknown to me Kindly also let me know how many kinds of these dye testing material are there? Without knowing the intended applications that is difficult to say. The dye vary from application to application, some being visible other for use with specific NDT products and more so with custom applications for specific client base. Many people also consider the penetrating gas material to fall under the dye testing header as well.
2016-05-21 18:53:29 · answer #2 · answered by ? 3 · 0⤊ 0⤋
Dye penetration is a non-destructive method which is used to detect surface breaking discontinuities in metals, plastics and ceramics. The test is performed by cleaning the test surface thoroughly and then applying the penetrant followed by the application of developer. The developer assists to draw penetrant out from the surface breaking the discontinuities.
The flaws can be recognized regardless of the size, configuration, internal structure and chemical composition of the surface area to be tested. Liquid penetrant can seep into various types of minute surface openings by capillary action. The process is well suited for various types of surface like cracks, laps, porosity, shrinkage areas, lamination and similar discontinuities in castings, forgings and welds.
The liquid is generally a bright or a fluorescent dye which as penetrant soaks into the detected surface area and then the excess which is left over the surface is wiped off after the soaking period. Thereafter, the developer is applied
The developer is usually a dry white powder suspension which is sprayed on the component on the surface where cavity is appeared. The developer is drawn out of the crack by the reversed capillary action resulting in a colour indication on the surface that is broader than the actual flow and therefore is much more visible.
STRC, performs the tests in accordance with the industry standards which is well acknowledged by the users.
2014-03-21 19:48:19 · answer #3 · answered by ndttesting 1 · 0⤊ 0⤋
That's a lot. Better refer online encyclopedias.
2007-07-18 05:26:30 · answer #4 · answered by ag_iitkgp 7 · 0⤊ 0⤋