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The techniques experiencing the slowest growth are expected to be radiographic testing, liquid penetrant and magnetic particle testing, as they do not easily lend themselves to automation or computerization, causing many end users to abandon the techniques in favor of others such as ultrasonics or thermography. There are five methods of NDT available to metalcasting - magnetic particle testing (MT), liquid penetrant testing (PT), ultrasonic testing (UT), radio- graphic testing (RT) and eddy current testing (ET). The basic steps for using the magnetic particle testing procedure consist of magnetizing the test casting, applying magnetic particles in powder form to the test specimen, examining the surface area for tell-tale clusters of powder and, finally, demagnetizing the casting. |
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