抄録
During operation, different defects initiate and grow in machine components due to fatigue, SCC, etc., and the reliability of components decreases with operating time. The performance and safety have to be maintained by regular and adequate inspection techniques and appropriate treatment. Furthermore these concepts have to be extended to evaluate residual life of components. The potential drop (PD) technique utilizing electromagnetic induction is a nondestructive inspection technique based on electromagnetic technique. This technique has been applied to the detection and sizing of both front and back surface defects in a laboratory. Unfortunately, most nondestructive inspection (NDI) and evaluation (NDE) techniques are strongly affected by many actual field parameters such as the skill of operator, the measurement environment, the shape of the measured object, etc. Especially, the technical skill of the operator is the most important parameter, and the way to investigate the effect of this parameter on the detectability of a NDI technique is by utilizing a probability of detection (POD) curve. In this study, by analyzing the POD curve obtained from operators trained for four hours to examine a welded specimen, the effect of the technical skill of the operator on the detectability of the induced current PD technique is investigated.
