A6061铝合金脉冲MIG焊T型接头应力场有限元模拟
Finite Element Simulation of Stress Field of A6061 Aluminum Alloy Pulse MIG T-Joint
摘 要
基于B样条拟合非线性曲面的优势建立B样条焊缝模型，根据脉冲熔化极惰性气体保护（MIG）焊接基-峰值电流热输入特点建立高斯面+锥形体组合热源模型，采用该模型模拟A6061铝合金脉冲MIG焊T型接头的温度场及应力场，并进行了试验验证。结果表明：模拟所得T型接头熔池的熔深和熔宽以及特征点峰值温度与试验结果间的相对误差不大于1.4%，验证了模型的准确性。在距焊缝中心约10 mm和30 mm处的纵向残余应力模拟结果与试验结果间的相对误差分别为28.0%和20.6%，其计算精度比采用简化焊缝及双椭球热源模型至少提高了15.7%。
B样条焊缝
组合热源
残余应力
pulse MIG welding
B-spline weld
combined heat source
residual stress
Abstract
B-spline weld model was established based on the advantages of B-spline fitting nonlinear surface, and the combined heat source model of Gaussian surface and conical body was established based on characteristics of pulse MIG welding base-peak current heat input. The temperature field and stress field of pulsed metal inert-gas (MIG) welded T-joint of A6061 aluminum alloy were simulated by the models, and were verified by the tests. The results show that the relative errors between the molten pool depth and width and the characteristic point peak temperatrue of T-joint by simulation and test results were less than 1.4%, proving the accuracy of the model. The relative errors of the longitudinal residual stress at about 10 mm and 30 mm away from the weld center between the simulation and the test results were 28.0% and 20.6%, respectively, and the calculation accuracy was at least 15.7% higher than that by the simplified weld and double ellipsoid heat source model.
中图分类号 TG402 DOI 10.11973/jxgccl202309012
所属栏目 物理模拟与数值模拟
基金项目 国家自然科学基金资助项目（52075159）；湖南省自然科学基金资助项目（2022JJ30019）；湖南省教育厅科学研究重点项目（21A0301）；江西省自然科学基金资助项目（20224ACB218002）；江西省高层次高技能领军人才培养工程资助项目；省部共建特色金属材料与组合结构全寿命安全国家重点实验室开放基金资助项目（2022GXYSOF24）
收稿日期 2022/7/9
修改稿日期 2023/7/24
网络出版日期
作者单位点击查看
备注何奇(1999-),男,湖北荆州人,硕士研究生
引用该论文: HE Qi,LI Shichun,GU Jinliang,XIAO Gang,HUANG Hao. Finite Element Simulation of Stress Field of A6061 Aluminum Alloy Pulse MIG T-Joint[J]. Materials for mechancial engineering, 2023, 47(9): 70～75
何奇,李时春,谷金良,肖罡,黄浩. A6061铝合金脉冲MIG焊T型接头应力场有限元模拟[J]. 机械工程材料, 2023, 47(9): 70～75
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【2】向祖权, 刘彬, 杜洪文, 等.翼板厚度差异对T形接头焊接变形的影响研究[J].武汉理工大学学报(交通科学与工程版), 2016, 40(2):261-264. XIANG Z Q, LIU B, DU H W, et al.Research on T-joint welding deformation in different flange thickness[J].Journal of Wuhan University of Technology (Transportation Science & Engineering), 2016, 40(2):261-264.
【3】WANG Z M, JIANG D H, WU J W, et al.A review on high-frequency pulsed arc welding[J].Journal of Manufacturing Processes, 2020, 60:503-519.
【4】强伟, 路永新, 袁银辉, 等.T形接头冷丝填充双热源协同焊接数值模拟[J].材料科学与工艺, 2021, 29(5):57-62. QIANG W, LU Y X, YUAN Y H, et al.Numerical simulation of T-joint welding with cold wire filling and double heat sources[J].Materials Science and Technology, 2021, 29(5):57-62.
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【19】KHOSHROYAN A, DARVAZI A R.Effects of welding parameters and welding sequence on residual stress and distortion in Al6061-T6 aluminum alloy for T-shaped welded joint[J].Transactions of Nonferrous Metals Society of China, 2020, 30(1):76-89.
【20】张晓鸿, 陈静青, 陈辉.基于复合热源模型的Al-Mg-Zn铝合金脉冲MIG焊接模拟[J].焊接学报, 2018, 39(1):17-21. ZHANG X H, CHEN J Q, CHEN H.Simulation on pulsed-MIG welding process of Al-Mg-Zn aluminum alloy by FEA based on hybrid heat source model[J].Transactions of the China Welding Institution, 2018, 39(1):17-21.
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