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Phone: +91-80-2573 0691
contact@scientechservices.com
Scientech Services
No. 15, Singasandra, 14th K.M.
Hosur Road,
Bangalore - 560 068
Fax: +91-80-2573 0719 |
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Principles: MPT is a method of locating surface and slightly subsurface discontinuities in ferromagnetic materials. It depends on the fact that when the material or part under test magnetized, discontinuities that lie in a direction of the magnetic field will cause a leakage field to be formed at and above the surface of the part. |
| The presence of this leakage field and therefore the presence of the discontinuity is detected by the use finely divided ferromagnetic particles applied over the surface, with some of the particles being gathered and held to form an outline of the discontinuity. This generally indicates its location, size, shape and extent. Magnetic particles are applied over a surface as dry particles or as wet particles in a liquid carrier such as water or oil. |
| Applications: The principal industrial uses of magnetic particle testing are for final, receiving and in-process testing; for quality control; for maintenance and overhaul in the transportation industries; for plant and machinery maintenance, and for testing of large components. Some of the typically detected discontinuities are surface discontinuities, seams, cracks and laps. |
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| Principles: LPT reveals discontinuities open to the surfaces of solid and nonporous materials. Indications of a wide spectrum of discontinuity sizes can be found regardless of the configuration of the workpiece and regardless of discontinuity orientations. Liquid penetrants seep into various types of minute surface openings by capillary action. The cavities of interest can very small, often invisible to the unaided eye. The ability of a given liquid to flow over a surface and enter surface cavities depends principally on the following: cleanliness of the surface, surface tension of the liquid, configuration of the cavity and size of surface opening of the cavity. |
| Applications: The principal industrial uses of LPT are final testing, receiving testing, in-process testing and quality control, maintenance and overhaul in the transportation industries, in plant and in testing of large components. The following are some of the typically detected discontinuities: Surface discontinuities, seams, cracks, laps, porosity and leak paths. |
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