SCTEC-UF 101 Study Guide - Quiz Guide: Magnetic Particle Inspection, Stress Concentration, Ferromagnetism
14 Aug 2016
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Document Summary
Magnetic particle inspection method is a ndt that is used on ferrous metals in which the part being tested is magnetized, producing north and south poles across any discontinuity, either on the surface of subsurface. Circular magnetization when current is passed through the part causing flux to flow circularly around the part (right hand rule) Longitudinal current is passed around the part by using a solenoid causing flux to flow through the part"s length. In circular magnetization, only defects that run across the length, or horizontal of the part. In longitudinal magnetization, only defects that run across the width of the part or defects that are perpendicular to the magnetic field. Fatigue cracking are only found in parts that were in service. These cracks are typically in highly stressed areas of a part where a stress concentration exist. Magnetic particle inspection method can detect surface and slightly subsurface discontinuities. Ac and dc can be used to magnetize a part.
