非破壊試験の信頼性を考慮した溶接欠陥の採否限界決定手法 : 建築鉄骨溶接部の例

概要

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In the present paper, consideration has been carried out of the relationship between the defect detectability of NDT and the repair rate of welds and the reliability of inspected welds. In order to get a certain high quality level of welds, critical level for repair A_<cr> should be set smaller than the critical allowable defect size α_<cr>. That is, α_<cr>/A_<cr> is the factor of safety to defect detectability of NDT. The more setting smaller of critical level for repair or deteriorating the accuracy of defect measuring by NDT, the more repair rate of welds γ increases. Increasing of γ does not always realize increasing of the reliability of welds R. In the case of deteriorating of accuracy of measuring the defect, R decreases even if γ increases. The reliability of welds increases according to increasing repair rate, in the case of increasing sampling ratio or in the case of inspecting with emphasis on higher defective joints even if sampling ratio is equal to the case of random sampling. Based on the above consideration, the decision method is discussed of the rational inspection method for assuring a certain reliability of welds and also minimizing the total cost of inspection.
社団法人溶接学会の論文
1981-03-05