被覆アーク溶接継手の疲れ強さに及ぼす溶接止端形状および溶接条件の影響についての統計的解析

概要

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In order to investigate the relationship between the fatigue strength and the reinforcement shapes for several types of welded joint, the axial load controlled fatigue tests were carried out employing SM 50 B, SM 58 Q and HT 80LQT steel plates. And the relationship above mentioned were analyzed statistically and discussed about each one group and between groupes that were classified according to materials, type of joints, dimensions of joints, etc. It was found from these analyses that the variance of fatigue strength between several groupes was mainly attributed to the multiple effect of the stress concentration due to reinforcement shapes of the weld, together with the bending stress at the weld toe to the mismatch and the angular distortion of welded joints. And the influence of welding conditions on the fatigue strength was aiso discussed and was sholvn the necessity of investigating the most suitable welding condition to ensure the 10wering of the fatigue strength to the minimum value that was caused by the stress concentration at the toe of the weld.