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부광석,위철민 인제대학교 1999 仁濟論叢 Vol.14 No.3
This paper describes a new nondestructive testing method to find out a defect within a welded material. It is impossible to find whether there exist a defect such as a blowhole within the bonded material just by appearance. If there is a defect within the material, heat flow around the defect may be different with the case of the material with no defect. In this paper, the heat flow in the material with a defect is analyzed based upon heat conduction. A new method to detect a defect within the material is proposed based on the heat flow analysis. After heating the surface of the material for testing, we can detect whether there is a defect within the bonded part between two materials by the surface temperature measurement. This approach is applied on detecting defects in joining part of an oven bowl for an electiric rice cooker.