高周波誘導加熱処理による面外ガセット溶接継手ルート部の疲労強度向上効果

抄録

In this study, the enhancement of fatigue strength at the weld root in out-of-plane gusset welded joint by high frequency induction heating (IH) treatment was investigated. Fatigue tests were conducted to examine the fatigue strength enhancement by IH treatment. IH treatment was applied to both sides of a boxing weld in the specimens. Test results show 1-grade or more fatigue strength enhancement while the fatigue cracks were generated both from weld root and weld toe in a longitudinal attachment. Additionally, finite element analysis was performed to investigate the fatigue strength enhancement based on effective notch stress. Two million cycle fatigue strength was improved 2.25 times than the welded joint without IH treatment.