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Magnetic Particle Inspection (MPI) is a non-destructive testing method where an electrical current is passed through a test specimen forming a magnetic field.
The test is intended to establish if the continuity of the material is intact and identifies surface and near surface flaws. Once magnetised, if there is any discontinuity in the material, the magnetic field will leak. Iron particles are applied to the specimen and if an area of leakage is present the iron particles will be attracted to this area. The build up of these particles indicates potential flaws in the material which can then be investigated further.
Magnetic Particle Inspection is an excellent method for detecting surface or near surface cracks in the material. The specimen should be tested in two directions at 90 degrees because it is possible that a surface crack could be following the direction of the magnetic field. If this were the case the field is unlikely to be interrupted and therefore no flaw would be identified.
HIC Steel
The test is also very useful when supplying steels which need to show resistance to the effects of Hydrogen Induced Cracking (HIC). Pressure vessel and boiler grade steels will benefit greatly from such a test especially if the steel is to be used in sour gas service.The test cannot be used on austenitic steels nor will it identify deep flaws in the material inspected.
Masteel offers third party magnetic particle inspection as one many testing services available to our clients. For more information about our testing services please click here to contact Masteel today.
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Masteel UK Limited,
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B46 2HH
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