Magnetic Particle Testing in Alberta, Canada

Magnetic Particle Inspection (MPI/MT) is a non-destructive testing method used to detect surface and near-surface defects in ferromagnetic materials such as iron, steel, and nickel. It is commonly used in various industries, including manufacturing, aerospace, automotive, and oil and gas.

In MPI, the test object is magnetized using a strong magnetic field. This magnetization creates magnetic lines of force within the material. When there is a defect or crack on the surface, the magnetic field is disturbed and forms a leakage field around the defect.

Next, ferromagnetic particles, usually iron-based and finely ground, are applied to the surface of the test object. These particles are attracted to the leakage field, forming visible indications that highlight the presence of defects. The particles can be dry powder inspection or suspended in a liquid or wet suspension.

To enhance the visibility of the indications, contrasting colors or fluorescent materials can be used. In fluorescent MPI, ultraviolet light is used to excite the particles, making them emit visible light, which makes the indications easier to detect under darkened conditions.