In eddy current testing (ECT), the permeability distribution of the steel materials affects inspection results and the signal-to-noise (S/N) ratio decreases. Therefore, magnetizing the materials is required to reduce the magnetic noise. In this research, the spring steel materials that have artificial microcracks were magnetized and inspected to evaluate detection performance of a developed ECT probe. It was confirmed that the probe is able to detect the 40 ?m depth crack with the S/N ratio of 3 or more. I...
英字タイトル:
Flaw detection for microcrack and crack shape estimation with magnetic saturation ECT

Mechanical parts, plants and cross-linkages inspected with magnetic-particle testing (MT) are typically complex 3D shapes. In complex 3D shape portions, because a magnetizer often cannot be configured to inspection portions and the test object cannot be appropriately magnetized, there is a possibility of overlooking a crack in such an instance. Thus, MT system development that was successfully able to detect omnidirectional cracks in 3D shape portions was considered in this study’s trials. Two multi-coil ty...
英字タイトル:
Development of magnetization system for magnetic particle testing in all surfaces of 3D shape test object