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Magnetic inspection

Magnetic inspection is a non-destructive testing process for detecting surface and slightly subsurface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys. These materials lose their ferromagnetic properties above a characteristic temperature called the Curie point which is approximately 760oC for most of the ferromagnetic material.

The process puts a magnetic field into the part. The piece can be magnetized by direct or indirect magnetization. Direct magnetization occurs when the electric current is passed through the test object and a magnetic field is formed in the material. Indirect magnetization occurs when no electric current is passed through the test object, but a magnetic field is applied from an outside source.

Magnetic inspection is the economical and comparative faster non-destructive test method used widely in aerospace, automotive, power generation, nuclear, petrochemical industries and etc.

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