Wednesday, March 22, 2017

TECHSHORE INSPECTION SERVICES : YOKE IN MAGNETIC PARTICLE TEST

Magnetic particle test (MPT) 

Magnetic particle test (MPT) is an advanced method in NDT. Using MPT we can detect surface & near to surface defects on a ferromagnetic material.
Here test piece that has to be inspected is magnetized using a magnet. Both permanent magnets & electromagnets are used in MPT. But due to some inconveniences permanent magnets cannot be used everywhere. Even this method is of low cost due to lack of control of field strength & difficulty of placing & removing strong permanent magnets from the component, this method is not widely used.
Electromagnets in the form of an adjustable horseshoe magnet (called a yoke) eliminate the problems associated with permanent magnets and are used extensively in industry. Electromagnets only exhibit a magnetic flux when electric current is flowing around the soft iron core. When the magnet is placed on the component, a magnetic field is established between the north and south poles of the magnet.
Yoke is portable type device. So that it is more easy to use at any corner of the area where we need to test. Since MPT require more than one step, it is necessary to change the magnetic direction. Here yoke is very helpful. Yoke is less in weight but it can lift even heavy parts due to its magnetic power.

Below shows the image of a yoke.



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