軟鋼溶接継手の疲れ強さ改善に及ぼす予ひずみ及びハンマピーニングの影響

概要

論文の詳細を見る
In this study, the effect of tensile prestrain and hammer peening, which give locally deformation and prestrain at weld toe, on fatigue strength was investigated, using mild steel (SS 41) welded joint with reinforcement. The following experimental results were obtained; 1) The fatigue strength of welded joint was increased with increase of tensile prestrain. 2) Hardness of weld toe was increased with increase of tensile prestrain. 3) The tensile residual stress on the surface of welded joint was remarkably decreased by 0.15 or 0.20% tensile prestrain compared with as-welded joint. Moreover, tensile prestrain over 1.0% converted the residual stress from tension into compression. 4) The fatigue strength improvement of welded joint by tensile prestrain was attributed to increase of hardness and compressive residual stress. 5) The fatigue strength of welded joint by proper hammer peening was improved about 50% compared with as-welded joint. This improvement was caused by mainly form effect of weld toe and additionally work hardening.
社団法人溶接学会の論文
1982-07-05