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In modern industrial manufacturing, eddy current testing technology has become an important tool for ensuring the surface quality of forged steel rolls. Eddy current roll surface detection is based on...
For under-surface cracks, the maximum time of the induced magnetic field will appear as the depth of the defect increases; however, for surface cracks, the maximum value of the induced magnetic field at different depth cracks appears almost the same. This shows that the pulsed eddy current is more suitable for the quantitative detection of subsurface deep cracks. In practical applications, the corresponding curves of the depth and the maximum occurrence time of the induced magnetic field can be drawn according to the response data of the artificial defects of different depths. After the time when the maximum value of the defect response signal is detected in the actual detection, it can be corresponding to the reference curve. Determine the depth of the defect.
