탄소강 선재 표면균열의 능동형 유도 적외선 열화상 검사

In this study, an active induction infrared thermography is developed and applied to detect surface-breaking cracks on steel wire rods, which are frequently made by the rolling process in the manufacturing factory, using the thermal response of surface cracks to an impulsive excitation of electromagnetic induction. Artificial cracks, 20 μm wide and 10 mm long along the axial direction with nine different depths ranging from 20 μm to 100 μm by increments of 10 μm, are machined by laser on two types of steel wire rods (ɸ5.5 mm and ɸ13 mm) to investigate the detection capability of the induction infrared thermography equipment. All artificial cracks are successfully detected from thermal images, and it is concluded that the active induction thermography is a fast and low-cost method to inspect the surface micro-cracks of steel wire rods that could not be detected and visualized by other nondestructive methods. KCI Citation Count: 0