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| Category: Magnetic Particle | Page: 1 of 1 | |
 Magnetic Particle |
Files: 9 | |
Files:
 Demagnization of MPI 
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| Any ferromagnetic material subjected to magnetic particle inspection requires demagnetization. When performing magnetic particle inspection of aircraft parts, it is essential to demagnetize them. The inspector should understand the reasons for this step, as well as the problems involved and the available means for solving them. |
Date File size Hits |
2010-07-17 118.27 KB 40 |
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| Discontinuities and Their MPI Indications
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| An indication is an accumulation of magnetic particles being held by a magnetic leakage field to the surface of a part.
The indication may be caused by a discontinuity or it may be caused by some other condition that produces a leakage
field or it may be caused by mechanically held particle accumulation. |
Date File size Hits |
2010-07-17 696.2 KB 88 |
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| Introduction to Magnetic Particle Inspection
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| This section explains magnetic particle inspection, its purposes, and capabilities. This method is used for detecting discontinuities in ferromagnetic parts. The part is magnetized by using an electrical current that induces a magnetic field in the part. A discontinuity, which crosses the magnetic field, creates north and south poles on either side of the defect area. When magnetic particles are applied to the part, the poles attract the particles and an indication of the discontinuity is formed. Magnetic field characteristics are described, as well as the various techniques and equipment used to magnetize and demagnetize components under inspection. |
Date File size Hits |
2010-07-17 340.21 KB 46 |
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| Magnetic Particle Inspection Techniques
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| Magnetic particle inspection is a method of nondestructive testing that uses very small ferromagnetic particles to reveal discontinuities in parts capable of being magnetized. Magnetizable parts are those parts made of metals classed as ferromagnetic. To find flaws in metals that are not ferromagnetic, such as aluminum, titanium, brass, etc., other inspection methods must be used. |
Date File size Hits |
2010-07-17 244.77 KB 54 |
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| Magnetic Rubber inspection Method
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| Magnetic rubber inspection (MRI) is an extension of magnetic particle inspection and is a nondestructive inspection technique used for detecting cracks or other flaws on or near the surface of ferromagnetic materials. |
Date File size Hits |
2010-07-17 464.01 KB 84 |
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| Methods of Recording MPI Indications
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| The full value of magnetic particle inspection can be realized only if records are kept of parts inspected and the
indications found. The size and shape of the indication and its location on the part should be recorded along with other pertinent information, such as rework performed or disposition. The inclusion of some visible record of the indications on a report makes the report much more complete. |
Date File size Hits |
2010-07-17 36.9 KB 37 |
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| MPI Materials and Respective Methods
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| An important consideration in the magnetic particle testing process is the use of the proper type of materials to secure the best possible indications of the particular type of defect being sought under a given condition. The choice of which materials to use is important, since the appearance of the particle patterns at discontinuities will be affected by this choice, even to the point of whether or not a
pattern is even formed. Since the results of magnetic particle tests depend on the interpretation of the particle pattern, the appearance of this pattern is of fundamental importance. The reproducibility of results by inspectors at different locations is dependent on the same type of particles being used by each inspector, and the same magnetizing procedure. |
Date File size Hits |
2010-07-17 194.18 KB 39 |
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| Portable MPI Techniques
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| Portable induced f ield inspection equipment is generally referred to as either a probe or a yoke. These terms are synonymous and differ only due to manufacturer’s nomenclature. This category of inspection equipment is described here in conjunction with the techniques for their use and application. |
Date File size Hits |
2010-07-17 156.97 KB 49 |
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| Pre- and Post- MPI Cleaning & Pre- MPI Disassembly
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| Pre-cleaning is the removal of all foreign material (paint, grease, oil, corrosion, layout dye, wax crayon markings, etc.) which may interfere with magnetic particle testing that has accumulated since the general cleaning operation but prior
to inspection. |
Date File size Hits |
2010-07-17 42.93 KB 49 |
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