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DENG Caiyan, LIU Xi, WANG Dongpo. Fatigue performance of Q345 steel welded joints by high temperature ultrasonic peening[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(11): 47-50.
Citation: DENG Caiyan, LIU Xi, WANG Dongpo. Fatigue performance of Q345 steel welded joints by high temperature ultrasonic peening[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(11): 47-50.
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Fatigue performance of Q345 steel welded joints by high temperature ultrasonic peening

  • 1.

    Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China

  • 2.

    Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China;Jiangsu Xuzhou Construction Research Institute, Xuzhou Construction Machinery Group, Xuzhou 221004, China

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  • Received Date: May 25, 2013
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    • Abstract
  • In order to investigate the effect of high temperature ultrasonic peening on fatigue performance of Q345 steel welded joints, the weld toes were treated by self-developed ultrasonic peening device at room temperature(20℃), 250℃, 350℃ and 450℃, respectively. The results indicated that when the stress ratio R was equal to 0.1, both the conventional and hightemperature ultrasonic peening treatments greatly enhanced the fatigue performance of Q345 steel butt joints. Moreover, compared with the as-welded joints, the degree of improvement of fatigue performance of Q345 steel welded joint treated at 250℃was the highest, up to 99.41%. In addition, the degree of improvement of fatigue performance increased first and then decreased with the increasing peening temperature under the influence of residual stress and stress concentration.
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