Magnetic Particle Inspection (MT)

Definition - What does Magnetic Particle Inspection (MT) mean?

Magnetic Particle Inspection is a non-destructive process used to detect the surface and subsurface discontinuities in ferromagnetic materials like nickel, cobalt, iron, and their alloys. Magnafluxing is the popular name used for Magnetic Particle Inspection. Small magnetic particles and magnetic fields are used to find out flaws in various components. The process is used to detect various forms of products including forgings, castings and weldments. Many industries use the process to figure out the component's fitness for use.

Petropedia explains Magnetic Particle Inspection (MT)

A magnetic field is used in the process of Magnetic Particle Inspection. The piece is magnetized by indirect or direct magnetization. The magnetic field is formed when an electric current passes through a test object. During this phase, direct magnetization takes place. Indirect magnetization takes place when the electric current is not passed through the test object and the magnetic field is applied with help from outside.

The magnetic flux is allowed to leak, during a subsurface or surface discontinuity in the material, as air is not capable of supporting much magnetic field per unit volume as compared to metals. After this ferrous iron particles are applied to the part.
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