軟鋼用イルメナイト型アーク熔接棒の統計的研究(第 1 報) : 引張試驗値の統計値

概要

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Authors analysed on the Statistics of the tensile test results (tensile strength, yield point, yield ratio, elongation and reduction of area) of ilmenite type arc welding electrodes (4 and 5mm diameters) at the Railway Technical Research Institute, JNR., during 1950∿1953 in accordance with JIS G 3524 (similar to AWS standard). The results are summarized : 1) Distribution types of population of mechanical properties of two diameters were considered as normal. (Table 1,Fig. 2) 2) For the mechanical properties of two diameters, minimum, maximum value, distribution range and estimated values of mean and standard deviation were analysed. (Table 2,Fig. 3) 3) There were very significant mean differences in the values of tensile strength, yield point and reduction of area between two diametens. The values were higher in the 4mm than in the 5mm. (Table 3) 4) As to the variance in the tensile strength between the two diameters, the 4mm was larger than 5mm. (Table 4) 5) Test electrodes mostly gave standard value of D 4301 (JIS G 3524). Very few did not conform to standard values of tensile strength yield point, but 10% (4mm), and 5% (5mm) fell short of elongation standard. (Table 5).
社団法人溶接学会の論文
1956-02-10