Magnetic Particle Test Discontinuities
There are three general classes of discontinuities. 1. Inherent discontinuities, formed during the basic formation of the test object. 2. Processing discontinuities, formed during…
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EQUIPMENT SELECTION FOR MAGNETIC PARTICLE TESTING
Magnetic particle testing equipment range from heavy, complex automated handling systems weighing several tons to small, lightweight portable units. The following are requirements to…
Read articlePRINCIPLE OF DEMAGNETIZATION ALTERNATING CURRENT DEMAGNETIZATION
Principles of Demagnetization Ferrous materials usually retain some residual magnetism after the magnetizing current is shut off. The strength of the residual field depends…
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MULTIDIRECTIONAL MAGNETIZATION LONGITUDINAL MAGNETIZATION
MULTIDIRECTIONAL MAGNETIZATION Multidirectional magnetization uses several contact points and relay switches to produce constantly varying magnetic fields. Typical uses of multi directional magnetization are…
Read articleMAGNETIZATION METHODS TEST MATERIALS OF MPI
The following characteristics affect key test parameters, including required magnetizing current, current on time, when to apply particles and demagnetization requirements. 1. Alloy, shape…
Read articleMagnetization Circular Fields
A circular magnetic field is induced into a test object either by passing magnetizing current directly through the test object (direct magnetization), or by…
Read articleEffects of Discontinuities on Materials
SURFACE DISCONTINUITIES The magnetic field surrounding subsurface discontinuities drops off very rapidly with distance below the surface. Magnetic particle movement is critical to the…
Read articleCHARACTERISTICS OF MAGNETIC FIELDS
The magnetic field surrounding a permanent bar magnet has polarity. As an example, the Earth itself can be considered a bar magnet because of…
Read articleLAW OF MAGNETISM
When an external magnetic field is applied to ferromagnetic materials, the magnetic domains align parallel to the applied fields. These domains are very small,…
Read articleMAGNETS AND MAGNETIC FIELDS
The theory of magnetic fields indicates that an object is magnetized when part or all of its atomic elements have their north and south…
Read articleCAPABILITIES OF MAGNETIC PARTICLE TESTING PERSONNEL QUALIFICATION
CAPABILITIES OF MAGNETIC PARTICLE TESTING Magnetic particle testing can reveal surface discontinuities, including those too small or too tight to be seen with the…
Read articleWhat is Magnetic Particle Testing
Magnetic particle testing can detect both production discontinuities, such as seams, laps, grinding cracks and quenching cracks, and inservice damage, such as fatigue and…
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