2024 年 32 巻 2 号 p. 430-435
In magnetic particle testing (MT), it is necessary to magnetize in the appropriate direction with sufficient strength. However, for test subject with complex shape, achieving adequate magnetization in the desired direction can be challenging. As a result, the inspected object is not properly magnetized, and cracks may be overlooked. Therefore, we considered the enhancement of reliability in MT for complex shaped test object using a three-dimensional rotating magnetic field. In this study, an MT magnetization system for applying a three-dimensional (3D) rotating magnetic field to large structures was examined. Two magnetizers were arranged at an angle of 90°, and magnetization distributions on the surface of the test object placed at the intersection of two magnetizers were evaluated using finite element analysis. The achievement of omnidirectional magnetization was confirmed in each part of the complex shape with changing the applied magnetic field angle to the test object.
