Linchpin
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Magnetic particle inspection (MPI) is used for the detection of surface and near-surface flaws in ferromagnetic materials. A magnetic field is applied to the specimen, either locally or overall, using a permanent magnet, electromagnet, flexible cables or hand-held prods. If the material is sound, most of the magnetic flux is concentrated below the material's surface. However, if a flaw is present, such that it interacts with the magnetic field, the flux is distorted locally and 'leaks' from the surface of the specimen in the region of the flaw.
8 months ago
Source: http://eurostir.co.uk/j32k/protected/band_3/ksndt002.html
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mikeyy
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is testing that does not destroy the test object. NDE is vital for constructing and maintaining all types of components and structures. To detect different defects such as cracking and corrosion, there are different methods of testing available, such as X-ray (where cracks show up on the film) and ultrasound (where cracks show up as an echo blip on the screen). This article is aimed mainly at industrial NDT, but many of the methods described here can be used to test the human body. In fact methods from the medical field have often been adapted for industrial use, as was the case with Phased array ultrasonics and Computed radiography.
8 months ago
Source: http://en.wikipedia.org/wiki/Nondestructive_testing
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ultimate
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Magnetic Particle inspection in Non Destructive testing is used for detecting cracks on the body of the material inspected. It works on the principle that if there is a crack, the magnetic particle automatically takes North and South Pole charges at the crack and assemble together in a line along the crack and the crack is easily detected at the line.
7 months ago
Source:
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