Influence of Welding Residual Stress on Fatigue Life of Welded Joint Treated by Ultrasonic Peening

doi:10.3901/JME.2023.10.124

Abstract

Abstract: IIW published recommendations on high frequency mechanical impact treatment for improving the fatigue strength of welded joints in 2016, which is data obtained from available small-scale welded specimens without considering the effect of welding residual stress. Experimental and numerical method are used to investigate the effect of welding residual stress on fatigue life of welded joints treated by ultrasonic peening(UP). The results show that the existence of welding residual stress causes significant relaxation of beneficial compressive residual stress induced by UP, and further reduces the fatigue improvement. The larger are the mean value of welding residual stress along depth and the stresses in the region where self-equilibrated tensile stresses by UP exist (at depths below about 1.5-4 mm), the easier compressive residual stresses are to be relaxed. The harmful effect of tensile welding residual stress on reducing the fatigue improvement by UP is confirmed and the influencing factors are also revealed, which will provide guidance on making recommendations on proper treatment procedures and fatigue improvement assessment of UP.

Key words: ultrasonic peening, welded joint, fatigue life, compressive residual stress, residual stress relaxation

CLC Number:

TG156

ZHANG Hai, WANG Dongpo, GAO Zhiwei. Influence of Welding Residual Stress on Fatigue Life of Welded Joint Treated by Ultrasonic Peening[J]. Journal of Mechanical Engineering, 2023, 59(10): 124-133.

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