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XIU Junjie, LI Yang, ZHANG Xiaoyu. Research on radial gap of 304L stainless steel piping with socket weld under vibration fatigue[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(8): 95-98. DOI: 10.12073/j.hjxb.20170102001
Citation: XIU Junjie, LI Yang, ZHANG Xiaoyu. Research on radial gap of 304L stainless steel piping with socket weld under vibration fatigue[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(8): 95-98. DOI: 10.12073/j.hjxb.20170102001

Research on radial gap of 304L stainless steel piping with socket weld under vibration fatigue

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  • Received Date: January 01, 2017
  • Based on fatigue experiment and finite element method (FEM), the effect of radial gap on the vibration fatigue was researched. The test results show that crack with a higher stress tend to originate at the weld toe while for the case of lower stress failures tend to occur at the root. The root failure is that the crack originates at the inside of weld roots and propagates to the outside surface of specimen on the socket side of the weld, the crack of toe failure initiates at the outside surface of the specimen near the pipe side toe of the weld and propagates to the inside surface. The radial gap of runout is higher than that of failure. The effects of radial gap on weld root and weld toe were also investigated by FEM. Results show that the radial gap can significantly reduce the stresses of weld root and weld toe, which decrease 14% and 1.4% with the width of radial gap from 0.1 mm to 0.4 mm. Further, the radial gap can redistribute the stress in the weld root and weld toe, which is beneficial to the fatigue life.
  • Young H C, Sun Y C. Socket weld integrity in nuclear piping under fatigue loading condition[J]. Nuclear Engineering and Design, 2007, 237(2): 213-218.[2] Young H C, Sun Y C. Assessment of socket weld integrity in pipings[J]. Journal of Loss Prevention in the Process Industries 2009, 22(6): 850-853.[3] Electric Power Research Institute. Vibration fatigue testing of socket welds[R]. Palo Alto: EPRI, 1999.[4] Lydell B, Riznic J. OPDE—the international pipe failure data exchange project[J]. Nuclear Engineering and Design, 2008, 238(8): 2115-2123.[5] 赵小辉, 王东坡, 王惜宝, 等. 承载超声冲击提高TC4钛合金焊接接头的疲劳性能[J]. 焊接学报, 2010, 31(11): 57-60. Zhao Xiaohui, Wang Dongpo, Wang Xibao,etal. Improvement of fatigue performance of TC4 Ti-alloy welded joints by loading ultrasonic peening[J]. Transactions of the China Welding Institution, 2010, 31(11): 57-60.[6] 贾启芬, 刘习军. 机械与结构振动[M]. 天津: 天津大学出版社, 2007.
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