CO_2-O_2 アーク溶接による軟鋼および高張力鋼溶接部の衝撃値および疲れ強さ

概要

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In the case of CO_2-O_2 arc welding of rimmed steel, it was previously shown that the impact values were increased by addition of a certain amount of oxygen to the supplied gas. But if the electrode wire contained a large amount of non-metallic inclusions, the amounts of those in weld metals also increased and consequently, the impact values of weld metals decreased considerably. In this paper, to confirm this effect of oxygen in supplied gas, some experiments were carried out about impact values of weld metal of semi-killed steel, killed steel, 60kg/(mm)^2 high tensile strength steel and 3.5% Ni steel. As a result of experiments, impact values of weld metals of these steels were increased by addition of oxygen to the supplied gas up to about 25%. But if electrode wire contained a large amount of inclusions, such tendency was not recognized. Such effect of oxygen in supplied gas on the fatigue strength of weld metal was also examined using various electrode wires and base metals. But the fatigue strength of weld metal was not considerably changed by addition of oxygen to the supplied gas up to 10∿25%.
社団法人溶接学会の論文
1967-10-25