構造用炭素鋼溶接金属の低サイクル疲労特性

概要

論文の詳細を見る
Completely reversed strain controlled low cycle fatigue properties at room temperature are investigated for structural carbon steels and weld metals. The weld metal specimens deposited by gas metal arc welding (GMAW) were taken from multi-pass weld metal such that gage length consisted entirely of the weld metal. The results indicate that there is a trend toward reductions in the low cycle fatigue life of weld metals as compared with the base metals. They are explained in terms of local plastic strain concentration by lack of uniformity of the multi-pass weld metals. The weld metals have not the same mechanical properties anywhere as confirmed by hardness distribution, and the fatigue crack grows preferentially through temper softening region of multi-pass welds. This study leads to the conclusion that fairly accurate estimates of the low cycle fatigue life of structural carbon steel weld metals are obtained by the results of base metals from the ratio of temper softening region. It is also confirmed by experiment that low cycle fatigue life of multi-pass welds can be improved significantly using half bead grinding technique and/or welding conditions.
社団法人日本機械学会の論文
1988-03-25