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Magnetic Particle

The test magnetic particle is used to detect surface and subsurface discontinuities in ferromagnetic materials. Are detected defects such as cracks, cold joint, inclusions, cold drop, double lamination, lack of penetration or sharp bends, segregation, etc..

The method is based on generating a magnetic field that travels across the surface of ferromagnetic material. The lines of magnetic flux induced in the material deviate from its path to find a discontinuity surface or sub-surface, thus creating a region of magnetic polarity, highly attractive to the magnetic particles. The moment that causes the magnetization this number, applies the magnetic particles across the workpiece that will be attracted to the surface location to contain a discontinuity forming a clear indication of a malfunction.

Some typical examples of applications are ferritic steel castings, forgings, rolled, extruded, welding, machining or parts that have undergone heat treatment (nuts and bolts), broken by grinding and many other applications in ferrous materials.

For the discontinuities are detected it is important that they are in such a way that is "intercepted" or "crossed" by lines of magnetic flux induced, consequently, the number should be magnetized in two directions at least 90 degrees out of phase. For this we use the known yokes, portable machines with manual contact or equipment for stationary magnetization series or standardized tests.

The use of optical readers is an important development in the automatic interpretation of results.