Magnetic Particle Testing Inspection

Magnetic particle testing is accomplished by inducing a magnetic field in a ferromagnetic material and then dusting the surface with iron particles. The surface will produce magnetic poles and distort the magnetic field in such a way that the iron particles are attracted and concentrated making defects on the surface of the material visible.

How to perform the test:

First put the specimen into the A.C current carrying coil and then take the specimen into the beaker. And pour some kerosene oil into the beaker and put some iron powder in it. The magnetic field produce by A.C current around the specimen. If there is any crack present in the specimen then there will be greater concentration of iron particle s around the crack or defect present in the specimen. If there is no crack then the iron particles will arrange themselves throughout the specimen.

TYPES:-

            There are two types of magnetic particle inspection test.

•  CONTINUOUS:- wet method.
•   RESIDUAL:- dry method.