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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.

HEAD OFFICE

#.5, Boopathystreet,
Virugambakkam
Virugambakkam Bus Stop opposite
Chennai - 600 092
Tamil Nadu, India
Tel : 044 - 42047244
Cell : 093810 48884.

BRANCH OFFICE

#.4, Old No.128/3
II nd Floor, Vannier Street
West KK Nagar
Chennai - 600 092
Tamil Nadu, India
Tel : 044 - 42077677
Cell : 093845 77677.

COIMBATORE OFFICE

DHEEPAM COMPLEX
No.574 to 581, 3rd Floor,
100 Feet Road,
Near G.P.Signal
LANDMARK : KALYAN JEWELLERY,
Gandhipuram,
Coimbatore - 641 012.
Contact - Jasmine - 93810 77677
Contact - Jessy - 093825 88890
Contact - Jecintha - 073580 27788
Email : twggroupchennai@gmail.com

TRICHY OFFICE

SRI GEM PLAZA
No.3, 4th Floor,
Sankaran Pillai Street,
S.R.C. College Road,
Chatram Bus Stand ,
Trichy - 620 002.
Contact - Suganya - 93845 77677
Contact - Jenifer - 96771 82739
Contact - Jecintha - 073580 27788
Email : twggroupchennai@gmail.com

 

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