Magnetic particle inspection, or just MPI inspection, is among the most common non destructive tests (NDT) methods. It is very important that you recognize the inspection methodology, the magnetic particle equipment used, and the specifications that lead the inspection.
MPI inspection is simply possible in materials that are ferro-magnetic materials like iron, cobalt, nickel, and some of their alloys such as steel, which is an alloy of iron. This NDT method is used for surface as well as slightly subsurface discontinuities such as voids and subsurface holes, pits, cracks, laps, and seams. The mag particle testing equipment employed uses alternating electric current or direct current to build a magnetic field in the test material or equipment, effectively functioning as an electromagnet. Magnetic materials like iron oxide particles are applied on the surface getting tested. Virtually any voids, subsurface holes, pits, cracks, laps, and seams present will have small poles and there will so be a concentration of magnetic flux and consequently magnetic materials around them. The testing can be wet, in which case the magnetic particles are placed in carriers like oil or water and black light (UV light) put to use in the detection, or it could be dry, in which case powder magnetic particles are being used.
The choice of the magnetic particle equipment should be according to your specific requirements. Probably the most popular MPI inspection equipment is the wet horizontal MPI machine. The device comes with a tail and head stock, which carries an inductive coil and where the portion to be tested is placed for magnetization. The mobile power pack is a custom-built magnetizing power supply, which is widely used to test wire wrapping. The magnetic yoke is beneficial in that it is actually a hand-held device. This non destructive testing equipment functions by inducing a magnetic field between 2 poles and it is common in usage outdoors and in weld inspection. Only buy your non destructive testing equipment from a reputable manufacturer.
There are actually different standards in different countries and economic zones that non destructive testing equipment should fulfil. The MPI inspection equipment or mag particle testing equipment has to fulfil the ISO (International Organization for Standardization) specifications including the ISO 3059, ISO 9934-1, ISO 9934-2, ISO 9934-3, ISO 17638, ISO 23279 in order to meet EN 1330-7, EN 1369, EN 10228-1, EN 10246-12, and also EN 10246-18 European Committee for Standardization or CEN standards in the European Union. In the U.S., the non destructive tests device needs to meet the American Society of Testing and Materials or ASTM standard, which include ASTM E1444-05, ASTM A 275 or A 275M, ASTM A456, ASTM E543, ASTM E 709, ASTM E 1316, and also ASTM E 2297. Other specifications that have to be fulfilled by the magnetic particle device are the Canadian Standards Association or CSA standards, the Society of Automotive Engineers or SAE standards in the automobile industry, and the United States Military Standard (A-A-59230) for general contractors for the U.S. Military.
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