Magnetic Particle Testing (MPT), also known as Magnetic Particle Inspection, is a nondestructive evaluation (NDE) technique that is a form of lifting equipment inspection. The test is implemented for detecting surface and subsurface faults in ferromagnetic materials including iron, nickel, and cobalt, as well as certain of their alloys. Conducting MPT is relatively quick and straightforward since it does not require the same level of surface preparation as other non-destructive testing procedures. As a result, it has become one of the most widely used NDE procedures under lifting equipment inspection.
When compared to other NDE approaches, MPT has several advantages. It is extremely portable, often affordable, and does not require extensive pre-cleaning. MPT is also a good choice for identifying small, shallow surface fractures. It’s quick and simple to use, and it even works through thin coatings.
Steps for Magnetic Particle Testing
- Surface Preparation – Rust, scale, sand, grease, paint, slag, greasy films, and other interfering conditions must be removed from all surfaces and nearby regions (within 1 inch). Magnetic particle cluster formation can be hampered by unusually rough or non-uniform surfaces, making interpretation of the magnetic particle inspection method’s signals problematic.
- Inducing a Magnetic Field – In the magnetic particle inspection technique, this is the most crucial stage. In this stage, you’ll set up the equipment in the test area and create a magnetic field. Magnetic particle inspection equipment comes in a variety of shapes and sizes. Permanent magnets, Electromagnetic Yokes, Current flow probes, Magnetic Flow, Flexible coil, Threading Bar, Adjacent cable, and other industrial equipment are commonly utilized.
- Applying Magnetic Particles on the Test Surface – Dry and wet magnetic particles are available in a range of hues to contrast with the tested material and can be fluorescent or non-fluorescent (visible, color contrast). So, after the specimen is magnetized, pick the appropriate particles for the magnetic particle inspection, and apply them to the surfaces.
- Examine The Component Surface for Defects – Using mild airflow, remove any surplus particles and check the component for flaws in accordance with approved requirements.
- Repeat the test by Changing the Magnetic Field – Each of the areas to be tested undergoes two independent inspections. The second study is carried out in the same region but using flux lines that are perpendicular to the first.
- Demagnetization and Cleaning – The existence of residual magnetism in the component might cause problems during later use. As a result, when the magnetic particle inspection is completed, the components must always be demagnetized.
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Categorised in: Inspection & Testing
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