非破壊試験の信頼性を考慮した検査後の溶接品質とその支配因子 : 建築鉄骨溶接部の例(<特集>溶接部の組織とじん性)

概要

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NDT, in general, is performed for quality assuarance of welds. The reliability of welds, however, is affected by the defect detectability of NDT or the other inspection factors. In the present paper, an analysis method for getting the reliability of inspected welds is declared, and the controlling factors of the reliability of welds are discussed. The reliability of welds is decided by correlation of the defect detectability of NDT and critical defect level for repair. According to the defect detectability of NDT, therefore, critical defect level for repair A_<cr> should be set smaller than critical allowable defect size α_<cr>. Deteriorating the defect detectability of NDT, the reliability of welds deteriorates. And the degree of deterioration of reliability depends on the sensitivity factor α_0 and on the accuracy factor σ_A, but if α_0 or σ_A is much smaller than α_<cr>, improvement of NDT detectability does not always increase the reliability of welds. It is necessary to select the inspection procedure according to α_<cr> for QA of welds. In sampling inspection, the reliability of welds R is decided definitely according to average sampling ratio p^^^-_s, and R-p^^^-_s is in linear relationship. If the highly defective joints exist, the reliability of welds increases by performing sampling inspection with emphasis on those joints.
社団法人溶接学会の論文
1981-01-05