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The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
WikiVisually
The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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Magnetic particle inspection
Videos
Magnetic particle inspection is a nondestructive testing process where a magnetic field is used for detecting surface, and shallow subsurface, discontinuities in ferromagnetic materials. Examples of f
A technician performs MPI on a pipeline to check for stress corrosion cracking using what is known as the "black on white" method. No indications of c
A technician performs MPI on a pipeline to check for stress corrosion cracking using what is known as the "black on white" method. No indications of cracking appear in this picture; the only marks are the "footprints" of the magnetic yoke and drip marks.
A close-up of the surface of a (different) pipeline showing indications of stress corrosion cracking (two clusters of small black lines) revealed by M
A close-up of the surface of a (different) pipeline showing indications of stress corrosion cracking (two clusters of small black lines) revealed by MPI. Cracks that would normally have been invisible are detectable due to the magnetic particles clustering at the crack openings. The scale at the bottom is numbered in centimeters.
A wet horizontal MPI machine with a 36 in (910 mm) coil
A wet horizontal MPI machine with a 36 in (910 mm) coil
Using a similar machine, a U.S. Navy technician sprays magnetic particles on a test part under ultraviolet light.
Using a similar machine, a U.S. Navy technician sprays magnetic particles on a test part under ultraviolet light.
Ferromagnetism
Videos
Ferromagnetism is a property of certain materials that results in a significant, observable magnetic permeability, and in many cases, a significant magnetic coercivity, allowing the material to form a
Magnetic particle inspection
…inspection (MPI) is a nondestructive testing process where a magnetic field is used for detecting surface, and shallow subsurface, discontinuities in ferromagnetic materials. Examples of ferromagnetic materials include iron, nickel, cobalt, and some of their alloys. The process puts a magnetic field into the part. The piece…
A magnet made of alnico, a ferromagnetic iron alloy, with its keeper
A magnet made of alnico, a ferromagnetic iron alloy, with its keeper