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高强钢低匹配等承载对接接头焊接残余应力调匀能力

赵智力1,王光临1,张远健1,方洪渊2

赵智力1,王光临1,张远健1,方洪渊2. 高强钢低匹配等承载对接接头焊接残余应力调匀能力[J]. 焊接学报, 2018, 39(7): 111-114. DOI: 10.12073/j.hjxb.2018390186
引用本文: 赵智力1,王光临1,张远健1,方洪渊2. 高强钢低匹配等承载对接接头焊接残余应力调匀能力[J]. 焊接学报, 2018, 39(7): 111-114. DOI: 10.12073/j.hjxb.2018390186
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ZHAO Zhili1, WANG Guanglin1, ZHANG Yuanjian1, FANG Hongyuan2. Homogenization capacity of welding residual stress in under-matching ELCC butt joint of high strength steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(7): 111-114. DOI: 10.12073/j.hjxb.2018390186
Citation: ZHAO Zhili1, WANG Guanglin1, ZHANG Yuanjian1, FANG Hongyuan2. Homogenization capacity of welding residual stress in under-matching ELCC butt joint of high strength steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(7): 111-114. DOI: 10.12073/j.hjxb.2018390186
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高强钢低匹配等承载对接接头焊接残余应力调匀能力

  • 1. 哈尔滨理工大学 材料科学与工程学院, 哈尔滨 150040;
    2. 哈尔滨工业大学 先进焊接与连接国家重点实验室, 哈尔滨 150001

Homogenization capacity of welding residual stress in under-matching ELCC butt joint of high strength steel

  • 1. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China;
    2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

摘要

    摘要
  • 摘要: 借助有限元软件研究了高强钢对接接头中焊接残余应力的调匀情况.结果表明，因母材塑性储备不足，所有接头焊后横向、纵向拉伸峰值应力均在焊接残余应力的基础上不断增加，但接头各区域应力增速不同，最终残余应力均未完全调匀.低匹配静载ELCC接头高塑性、低屈强比的盖面焊道位于高值残余应力所在的焊缝及近缝区母材表面并分担载荷，使该区应力增速放缓，故其残余应力调匀能力优于等匹配接头.考虑焊接残余应力的ELCC接头静载失效更可能发生在母材区，这与ELCC接头的设计目标相符.明确了静载ELCC设计可以忽略焊接残余应力的影响.
    Abstract: The homogenization of welding residual stress in butt joint of high strength steels is studied by means of finite element software. The results indicate that the peak stress in the all of the welded joints in the transverse and longitudinal tensile process will increase continuously on the basis of welding residual stress due to the insufficient plastic reserve of the base metal, and the stress growth rate in every region of the butt joint is different. Finally, the residual stress is not absolutely homogenized. Due to the cover passes with high plasticity and low yield ratio in the under-matching equal static ELCC joints locate in weld and surface of the near the seam base metal where distributed the peak value of welding residual stress, and share the tensile load, resulting in that the stress growth rate of the base metal zone near seam is slow, therefore, its homogenizing capacities of welding residual stress is better than that of the equal-matching joint. Considering the effect of welding residual stress, the static load failure of ELCC joint is more likely to occur in the base metal zone rather than welding zone, which is consistent with the original design goal. It is clear that the influence of welding residual stress can be neglected in the design of static load ELCC of under-matching butt joint.
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    • 参考文献(7)
  • [1] Rakin M, Gubeljak N, Dobrojevic M. Modeling of ductile fracture initiation in strength mismatched welded joint[J]. Engineering Fracture Mechanics, 2007, 11(75):3499-3510.
    [2] Rakin M, Medjo B, Gubeljak N. Micromechanical assessment of mismatch effects on fracture of high-strength low alloyed steel welded joints[J]. Engineering Fracture Mechanics, 2013(109):221-235.
    [3] 赵智力, 方洪渊, 杨建国. 一种针对低匹配焊接接头的"等承载"设计方法[J]. 焊接学报, 2011, 32(4):87-90. Zhao Zhili, Fang Hongyuan, Yang Jianguo. A design method of equal load-carrying capacity for under-matching weld joints[J]. Transactions of the China Welding Institution, 2011, 32(4):87-90.
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    [5] 周立鹏. 高强钢低匹配等承载对接接头随焊整形可行性研究[D]. 哈尔滨:哈尔滨工业大学, 2011.
    [6] 杨建国, 王佳杰, 方洪渊, 等. 随焊冲击碾压整形对低匹配等承载接头硬度与残余应力的影响. 焊接学报, 2013, 34(3):37-40. Yang Jianguo, Wang Jiajie, Fang Hongyuan, et al. Influence of weld shaping with trailing impact rolling on hardness and residual stress of under-matched equal load-carrying joint[J]. Transactions of the China Welding Institution, 2013, 34(3):37-40.
    [7] 赵智力, 王光临, 方洪渊. 高强钢低匹配对接接头焊接残余应力对静载强度影响. 焊接学报, 2016, 37(6):114-117. Zhao Zhili, Wang Guanglin, Fang Hongyuan. Influence of residual stress on static load strength of under-matching butt joint of high strength steel[J]. Transactions of the China Welding Institution, 2016, 37(6):114-117.
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  • 收稿日期:  2017-04-06

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