軟鋼用市販被覆電弧熔接棒の機械的性質に関する統計的研究(第 1 報) : 銘柄格付試驗合格率および熔着金属の不均質性について

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The mild steel covered arc-welding electrodes marketed in Japan are slag shield type of which the chief ingredient is ilmenite (FeO. TiO_2). They have been developed remarkably since before World War II, the number of brands, submitted for official approval, ten years. The results of mechanical tests upon them can be classified into three categories in the following table, i.e., class I, accounting for 16.5%; class II, 38%; and class III, 18.5%, having no connection with the kind of the core wire. [table] Next, the author discussed on the heterogeneity of deposited metals, citing the difference of mechanical test values of two test pieces taken from one deposited metal specimen, and proposed the allowable limit of these deviations as follows : Tensile strength, 3.7kg/(mm)^2 and elongation, 12.2% for tensile test. Charpy impace value, 4.5kg-m/(cm)^2 for inpact test.
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