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MAGNETIC PARTICLE TESTING

 
Magnetic particle Inspection services in chennai (MPI) is a non-destructive testing (NDT) process for detecting surface and slightly subsurface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys. The process puts a magnetic field into the part. The piece can be magnetized by direct or indirect magnetization. Direct magnetization occurs when the electric current is passed through the test object and a magnetic field is formed in the material. Indirect magnetization occurs when no electric current is passed through the test object, but a magnetic field is applied from an outside source. The magnetic lines of force are perpendicular to the direction of the electric current which may be either alternating current (AC) or some form of direct current (DC) (rectified AC).

A technician performs MPI on a pipeline to check for stress corrosion cracking using what is known as the "black and 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 magnetic particle inspection. Cracks which 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.

The presence of a surface or subsurface discontinuity in the material allows the magnetic flux to leak, since air cannot support as much magnetic field per unit volume as metals. Ferrous iron particles are then applied to the part. The particles may be dry or in a wet suspension. If an area of flux leakage is present, the particles will be attracted to this area. The particles will build up at the area of leakage and form what is known as an indication. The indication can then be evaluated to determine what it is, what may have caused it, and what action should be taken, if any.

A popular name for magnetic particle inspection is or used to be magna fluxing; The twg group was one of the early manufacturers of equipment and materials for the process.

About Us

PCN AND ASNT TRAINING IN CHENNAI is built on strong material Testing & Non - Destructive Testing expertise, founded in 2004 by group of professionals to serve the industry. Metal Testing Lab was awarded

ISO 17025 -2005 NABL Accredited Certification laboratory (Dept. of Science and Technology, Government of India) ISO 9001 - 2008 Quality Management System Certification services among few of the Metallurgical lab & NDT Services in India.

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Contact Us

No.5, Boopathy Street,
Virugambakkam,
Virugambakkam Bus Stop opposite
Chennai - 600 092.
Tamil Nadu, India.
Tel: 044 - 42047244,
044 - 42077677
Cell : 093810 48884, 9382588890
Email: twggroupchennai@gmail.com

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