Current Level and Particle Application
Two methods of processing are used in magnetic particle testing. The method to use in a given case depends on the magnetic retentivity of…
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Magnetic Particles and Methods of Application
The particles used in magnetic particle testing are made of ferromagnetic materials, usually combinations of iron and iron oxides, having a high permeability and…
Read articleDirect Current – Half Wave Direct Current – Full Wave Direct Current – Three Phase Full Wave Direct Current
Direct Current Direct current, on the other hand, magnetizes the entire cross section more or less uniformly in the case of longitudinal magnetization, and…
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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…
Read articleMagnetic 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.…
Read articleEFFECT 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…
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