WHAT IS ELECTRIC CURRENT? Describe Alternating Current
WHAT IS ELECTRIC CURRENT In the very early days of magnetic particle testing, it was believed that the most desirable current for magnetization was…
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Browse 30 free articles, standards and practical guides about Magnetic Particle Testing.
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Magnetic Permeability
One of the most important properties of magnetic materials is permeability. Permeability can be described as the ease with which materials can be magnetized.…
Read articleMagnetic Hysteresis
All ferromagnetic materials have certain magnetic properties that are specific to that material. Most of these properties are described by a magnetic hysteresis curve.…
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EFFECT OF MATERIALS ON ELECTROMAGNETIC FIELDS UNITS OF MEASURE FOR MAGNETIC FLUX
EFFECT OF MATERIALS ON ELECTROMAGNETIC FIELDS Magnetic properties are important because of their effect on the behavior of materials under an external field or…
Read articleMAGNETIC FIELD THEORY
Magnetic Domains Some materials that can be magnetized possess atoms that are classified as submicroscopic regions, called magnetic domains. These domains have a positive…
Read articleMagnetic Particle Testing Principle MPI Method Techniques of Magnetic Particle Testing
Magnetic particle testing is a nondestructive method of revealing surface and slightly subsurface discontinuities in magnetizable materials. It may be applied to raw materials…
Read articleMagnetic 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…
Read articleEQUIPMENT 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…
Read articleMULTIDIRECTIONAL 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…
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