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Magnetic Particle Test

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DETECTING SURFACE INDICATIONS IN FERROMAGNETIC METALS

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Magnetic particle inspection (MPI) is a non-destructive test (NDT) method that provides the detection of linear flaws located at or near the surface of ferromagnetic materials. It is viewed primarily as a surface examination method.

The principle of the method is that the specimen is magnetised either direct or indirectly to produce magnetic lines of force in the material. It is a very effective method for the location of surface-breaking and slightly sub-surface defects such as cracking, pores, lack of sidewall fusion in welds etc., in magnetic materials. This quick and relatively easy-to-apply technique is widely used in all industry sectors.

If a crack or other defect is present, the particles will be attracted to the flaw and build up around the leakage for an “indication.” The indication is then evaluated to determine the characteristics and cause of the defect. The results will allow our MPI testing team to understand the type and severity of any discontinuities on the part’s surface or sub-surface.

Magnetic particle inspection (MPI) is a non-destructive test (NDT) method that provides detection of linear flaws located at or near the surface of ferromagnetic materials.

It is viewed primarily as a surface examination method.

If there is a crack or other defect present, the particles will be attracted to the flaw and build up around the leakage to for an “indication.” The indication is then evaluated to determine the characteristics and cause of the defect.

Case Study :

Client Introduction:

Material suppliers

Problem:

Thinking that the material is metal means it can be used as a magnetic material.

Problem:

Most pipes and fittings being sent always have a yellow or black coating. Additionally, some samples have been painted over to protect the material.

Solution:

Not all metals can be magnetized well and retentive of their magnetism. Some metals are deemed paramagnetic and diamagnetic materials. These metals are not ideal when they’re needed to be used under magnetic particle testing.

Solution:

Often, it’s a matter of dollars and cents when preparing the material before the inspection. Though certain specifications allow the examination to be conducted with the coating, the client doesn’t know what the coating the samples have been covered with. Letting them know that it’ll affect the depth sensitivity and the thickness of the coating/paint will adversely affect the integrity of the inspection.

Reviews:

The client appreciates the help of explanation as their end user or buyer usually requests the testing but does not know what it means/impacts on the material. We will provide the proper clarification through the appropriate channel for our clients.

Advantages of Magnetic Particle Test

Quick and relatively uncomplicated

Immediate indications of defects

Shows surface and near-surface defect

mmediate indications of defects

Fast examination

Finest surface defects are detected

Common Test Methods

BS EN ISO 17638

ASME SEC V, Article 7 & 25

ASTM E709

AWS D1.1

Talk to us today

A magnetic particle test can detect surface and slightly subsurface discontinuities for quick inspections. Our expert testing team will create a magnetic field above the defect and detect the defect through the presence of a flux leakage field.

For more information on our magnetic particle testing, call us or send us an enquiry today. 

process timeline

Process #1
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Process #2
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
Process #3
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
Process #4
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
Process #5
Lorem ipsum dolor sit amet, mea ei viderer probatus consequuntur, sonet vocibus lobortis has ad. Eos erant indoctum an, dictas invidunt est ex, et sea consulatu torquatos. Nostro aperiam petentium eu nam, mel debet urbanitas ad, idque complectitur eu quo. An sea autem dolore dolores.
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