Non-destructive testing (NDT) involves using physical methods to test materials for flaws without damaging them. Two common NDT methods are liquid penetrant testing and magnetic particle testing. Liquid penetrant testing uses a dye that is drawn into surface cracks when applied to non-porous materials. Magnetic particle testing magnetizes ferromagnetic materials and uses iron particles to reveal surface or near-surface flaws. Both methods are useful for quality control during manufacturing as they can detect a variety of flaw types and orientations in one test. However, they are limited to surface or near-surface flaws and require clean surfaces to apply the testing medium.

1. - K.SAI MALLESWAR SC09B093 AVIONICS LIQUID PENETRANT ANDMAGNETIC PARTICLE INSPECTION

5. Radiographic testing method (RT)

9. Subdivision according to the method of washing of the specimen: (i) Water-washable (ii) Post emulsifiable: An emulsifier is added to the excess penetrant on surface of the specimen to make it water-washable (iii) Solvent removable: Excess penetrant is needed to be dissolved in a solvent to remove it from the test specimen surface.

10. The order of decreasing sensitivity and decreasing cost: (1) Post emulsifiable fluorescent dyepenetrant. (2) Solvent removable fluorescent dye penetrant. (3) Water washable fluorescent dye penetrant. (4) Post emulsifiable visible dyepenetrant. (5) Solvent removable visible dye penetrant. (6) Water washable visible dye penetrant.

12. Highly portable NDT method.

13. Highly sensitive to fine, tight discontinuities.

14. Fairly simple method.

15. Can be used on a variety of materials.

17. Detects surface discontinuities only.

18. Cannot be used on porous specimens and is difficult to use on very rough surfaces.

19. Removal of all penetrant materials, following the test, is often required.

21. This method is capable of detecting open to surface and just below the surface flaws.

23. DIFFERENT MAGNETIZATIONS:

26. Generally inexpensive.

27. Will work through thin coating.

28. Only few limitations regarding the size/shape of test specimens.

29. Highly portable NDT method.

31. Orientation and strength of magnetic field is critical.

33. “Burning” of test parts a possibility.

34. Parts must often be demagnetized, which may be difficult.

35. BIBLIOGRAPHY: www.ndt.org www.wikipedia.com

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