Magnetic particle (MT) testing is a technique that can be useful in General.Used to detect cracks in ferromagnetic material surface MTThe majority of the use of force because of its ease of.Detectability in MT depending on the intensity of magnetizationThe test object can be determined by various methods.For example, measure the tangential magnetic field to probe Tower.Researchers have developed a taste for Japan standard test.Check the status of the test object, the magnetization [1, 2] in the country of Japan.And the USA The standard test for AmericaFor many years, in order to determine the intensity of magnetization.Objects [3 5] Japan standard type test A sample is widely.Use the [1-3], which consists of a thin sheet of iron River.There is a Groove which artificial Shim properties.Carving of a varnish type test shimUse the standard tests are 50 and 100 mm thickness.The width of the Groove is about 70-90 mm. For the type.The standard test sample thickness 50 mm deep groove 7, 15.And 30 mm is likewise for A type test standards.Shim thickness 100 mm deep groove 15, 30 and 60 mm.The standard test is to use A shim in MT type.
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