Electromagnetic testing emt-mft chapter 9b
Electromagnetic testing emt-mft chapter 9b
Electromagnetic testing emt-mft chapter 9b
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It is possible to generate a magnetic field in a specimen either directly or<br />
indirectly. In direct magnetization, current is passed directly through the part.<br />
With the indirect approach, magnetization is induced by placing the part in a<br />
magnetic field that is generated by an adjacent current conductor or<br />
permanent magnet. This can be done, for example, by threading a conductor<br />
through a hollow part such as a tube or by passing an electric current through<br />
a cable wound around the part. Methods of magnetizing a part both directly<br />
and indirectly are illustrated schematically in Fig. 2.<br />
Charlie Chong/ Fion Zhang
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