金属学报  2012, Vol. 48 Issue (9): 1033-1041    DOI: 10.3724/SP.J.1037.2012.00174

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铝合金T型接头激光+GMAW复合热源焊温度场的有限元分析

胥国祥, 武传松, 秦国梁, 王旭友

1) 江苏科技大学江苏省先进焊接技术重点实验室, 镇江 212003 2) 山东大学液固结构演变与加工教育部重点实验室, 济南 250061 3) 机械科学研究总院哈尔滨焊接研究所, 哈尔滨 150080

FINITE ELEMENT ANALYSIS OF TEMPERATURE FIELD IN LASER+GMAW HYBRID WELDING FOR T-JOINT OF ALUMINUM ALLOY

XU Guoxiang, WU Chuansong, QIN Guoliang, WANG Xuyou

1) Key Laboratory of Advanced Welding Technology of Jiangsu Province, Jiangsu University of Science and Technology, Zhenjiang 212003 2) Key Laboratory for Liquid-Solid Structure Evolution and Materials Processing (Ministry of Education), Shandong University, Jinan 250061 3) Harbin Welding Institute, China Academy of Machinery Science & Technology, Harbin 150080

胥国祥 武传松 秦国梁 王旭友. 铝合金T型接头激光+GMAW复合热源焊温度场的有限元分析[J]. 金属学报, 2012, 48(9): 1033-1041.
, , , , . FINITE ELEMENT ANALYSIS OF TEMPERATURE FIELD IN LASER+GMAW HYBRID WELDING FOR T-JOINT OF ALUMINUM ALLOY[J]. Acta Metall Sin, 2012, 48(9): 1033-1041.

摘要 参考文献 相关文章 Metrics 全文: PDF(3271 KB)   摘要: 从宏观传热学出发, 综合考虑焊缝横断面形状特点及接头形式对焊接热流的影响, 建立了适用的T型接头激光+GMAW复合热源焊的组合式热源模型. 利用双椭球体热源模型描述电弧热流和熔滴热焓, 采用热流峰值指数递增--锥体热源模型表征激光热输入, 并通过坐标系转换的方法旋转热源模型, 以考虑焊枪倾斜对焊接热流分布的影响, 推导出适用于T型接头复合焊的热源模型表达公式, 从而简化了T型接头焊接数值模拟中的模型加载过程. 将所建立的模型用于不同焊接条件下铝合金T型接头激光+GMAW单侧双面焊接焊缝形状和尺寸的模拟计算, 计算结果与实验结果吻合较好, 从而证明了模型的准确性和适用性; 利用该模型计算了铝合金T型接头复合焊近缝区不同位置的热循环曲线, 分析了铝合金T型接头复合焊热循环特征, 为其组织和性能的预测奠定了基础. 关键词 ： 铝合金,  T型接头,  复合焊,  热源模型,  数值模拟     Abstract：T-welded structures of aluminum alloy are increasingly used in automotive, railway vehicles, aerospace and bridges. However, compared with the simple joint, the T-joint of aluminum alloy is more difficultly welded due to its complex temperature distribution and fluid flow mode in the weld pool. Whether using laser welding or the conventional arc welding process, aluminum alloy T-wleded joint is more prone to welding defects such as crack, pore, undercutting, joint softening, and so on. As a promising joining technology, laser+gas metal arc welding (laser+GMAW) hybrid welding not only combines the advantages of laser welding with those of GMAW, but also overcomes their shortcomings, thus having great potential to achieve high efficiency and high quality welding of aluminum alloy T-joint. So far, however, there is a lack of fundamental investigations involving mathematical modelling and understanding of the hybrid welding process of aluminum alloy T-joint. As key factors determining the weld quality, thermal field has a significant influence on microstructure and properties of T-welded joint. In this work, using the numerical simulation method, the temperature distribution in laser+GMAW hybrid welding of aluminum alloy T-joint was studied. Considering the influence of joint form on welding heat flux, an adaptive combined volumetric heat source model for laser+GMAW hybrid welding for T-joint is developed based on macroscopic mechanism of heat transfer. The arc heat flux and heat content of overheated droplet are described using an double ellipsoid body heat source model, and the laser power is regarded as peak density exponentially increasing-conic body distribution. To take into account the effect of inclination of welding gun on heat flow distribution in T-joint welding, the heat source model is rotated by way of coordinate transformation, thus deducing the formula of combined heat source model suitable to hybrid welding for T-joint. The built model is used to calculate the geometry and dimensions in laser+GMAW hybrid both-sided welding for T-joint of aluminum alloy under different welding conditons, and the simulated resluts agree well with the experimental ones, which indicates the accuracy and applicability of the combined model. Besides, the thermal cycles at different positions in hybrid welding for T-joint of aluminum alloy are computed, and the characteristics of the thermal cycles are analyzed, which will lay the foundation for prediction of microstructure and properties of welded joint. Key words： aluminum alloy    T-joint    hybrid welding    heat source model    numerical simulation 收稿日期: 2012-04-05      基金资助: 中俄国际合作重点课题资助项目2009DFR50170 作者简介: 胥国祥, 男, 1981年生, 讲师, 博士 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 胥国祥 武传松,WuChuan-Song 秦国梁 王旭友 林尚扬 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00174      或      https://www.ams.org.cn/CN/Y2012/V48/I9/1033 [1] Zuo T C. Laser Processing of High–Strengh Aluminum Alloy. Beijing: National Defence Industry Press, 2002: 60 (左铁钏. 高强铝合金的激光加工. 北京: 国防工业出版社, 2002: 60) [2] Zhang S H, Chen K, Xiao R S, Zuo T C. Laser J, 2005; 26(4): 45 (张盛海, 陈铠, 肖荣诗, 左铁钏. 激光杂志, 2005; 26(4): 45) [3] Defalco J. Weld J, 2007; 86(10): 47 [4] Graf T, Staufer H. 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