非磁性角鋼片誘導加熱探傷における短い傷の検出　　有限要素法による解析

概要

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The induction heating inspection method is a technique to detect surface defects on billets. When a billet passes through a high-frequency coil, an induced current flows on the billet surface. The current flow will be obstructed by any defects that are present, and the temperature of the areas surrounding the defects will differ from areas that are free from defects due to differences in the current paths. The billet temperature profile can be inspected using an infrared scanner, and consequently surface defects can be detected. In this study, we report the analytical results of temperature distribution using the finite element method with regard to short defects on the surface of non-magnetic square billets. The results we obtained are as follows: (1)In the area of a defect, the shorter the defect, the larger the temperature difference between the defective area and non-defective areas (2)Joule heating is larger at the edge of a defect than it is in other areas, partly due to concentration of the induced current. (3)For short defects, the temperature difference between non-defective and defective areas becomes larger with longer heating times.
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