How Magnetic Particle Inspection Detects Defects in Materials and Components

Nondestructive testing (NDT) is a term that is used to refer to several inspection techniques that are used to examine structural and mechanical components without damaging them to check whether they are safe to be used by the end-user. One such NDT inspection technique is magnetic particle inspection.

This technique is employed in many industries to check for defects so that accidents or failures can be prevented from taking place. Some of the industries that make use of magnetic particle inspection include structural steel production, oil, and petroleum, automotive, aerospace, etc.

Why Is This Technique Important

Magnetic particle inspection is essential for locating potential shortcomings or defects such as cracks near or at the surface of cobalt, iron, steel, and other ferromagnetic materials that could prove dangerous. It is known for providing quick indications of defects, especially the surface and near-surface defects, which are the most crucial ones as they hold stresses. You can inspect both small and large objects without the requirement of thorough prior cleaning of the objects.

How the Technique Works

If there’s any defect in the object being tested, it will produce disruption in the magnetic field. The technique first involves magnetizing the object being tested with the help of an electromagnet or permanent magnet. After that, the application of ferrous iron particles on the concerned surface is carried out. Once that is done, and if there’s any defect present, then those iron particles will be pulled to the disrupted magnetic field induced by the defect. All of this is easily visible in the inspection and defects can be identified. Since visual inspection is tough, professionals make use of specialized tools to comfortably identify defects.

To be able to carry out these critical inspections, one needs to be fully trained and certified. There are NDT inspection schools that offer courses wherein students can learn different types of NDT techniques and become qualified to inspect materials and components. Some top schools in Texas offer these courses. Get in touch with one to get going with your NDT inspection training.