鋼材および溶接継手の3%NaCl水溶接腐食疲れに関する研究(第3報)

鋼材溶接継手の腐食疲れについて

抄録

Fatigue strength of welded joint in air is remarkably low compared with dressed welded joint or base metal, because of stress concentration at the toe.
But, in the case of corrosion fatigue of welded joint, it is not clear, which factor is the most predominant, the notch effect, corrosion or the discontinuity of structure.
In this experiment the corrosion fatigue of three kinds of steel welded joints was lower than the fatigue strength in air only at lower stress and longer life, but not at higher stress and shorter life.
And then, this reason was experimentally deduced that the notch effect at the toe was the main factor to decide the corrosion fatigue strength of welded joints at higher stress but the corrosion effect was predominant at lower stress.