火箭贮箱侧壁法兰结构TIG焊接变形仿真与顺序优化  

Deformation simulation and sequence optimization of TIG welding for sidewall-flange structure of rocket storage tank

作　　者：尹宣 赵艳秋[1] 王建峰 王磊磊[1] 刘力源 鄢东洋[2] 占小红[1] Yin Xuan;Zhao Yanqiu;Wang Jianfeng;Wang Leilei;Liu Liyuan;Yan Dongyang;Zhan Xiaohong(Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;China Academy of Launch Vehicle Technology,Beijing 100071,China)

机构地区：[1]南京航空航天大学,南京211106 [2]中国运载火箭技术研究院,北京100071

出　　处：《焊接》2024年第1期21-26,共6页Welding & Joining

摘　　要：文中针对火箭贮箱侧壁法兰结构TIG焊接的变形情况开展有限元分析,建立2A14铝合金贮箱侧壁法兰结构TIG焊接有限元模型,采用双椭球模型模拟马鞍形焊缝的焊接热输入情况,并根据焊接过程温度检测结果及焊缝宏观形貌校核热源模型,重点探究焊接起始位置、焊接顺序对关键部位(焊缝、密封槽)焊接变形的影响。模拟结果表明,焊后变形主要集中在焊缝区域,密封槽变形较小;焊缝与密封槽的焊接变形分布趋势相近,均在B(B')点出现变形峰值。此外,与改变焊接起点相比,改变焊接顺序对焊接变形的影响更为显著。贮箱侧壁法兰结构焊接顺序优化结果显示,在盖面反向焊(方案四)下,焊接变形分布较为均匀,焊缝和密封槽焊接变形最小。在这种情况下,焊缝最大变形量为1.022 mm,密封槽最大变形量为0.505 mm。In this paper,the finite element(FE)analysis of TIG welding deformation on the sidewall-flange structure of rocket storage tank was carried out.The FE model of TIG welding of sidewall-flange structure of storage tank for 2A14 aluminum alloy was established.The double ellipsoid model was used to simulate the welding heat input of saddle-shaped weld,which was verified by temperature test results and weld macro morphology during welding.The influence of welding starting position and welding sequence on welding deformation of key parts(welding seam and seal groove)was emphatically investigated.The simulation results showed that the deformation was mainly concentrated in the weld zone,while the deformation of the seal groove was relatively small.The welding deformation distribution of weld seam and sealing groove was similar,while the deformation peak was occurred at the point B(B').Besides,compared to changing the welding starting point,the effect of changing welding sequence on welding deformation was more significant.The optimization results of the welding sequence of sidewall-flange structure of storage tank showed that the welding deformation distribution was more uniform under the cover reverse welding,i.e.,scheme 4,which was able to achieve minimum deformation for the weld and sealing groove structure.In that case,the maximum deformation of the weld was 1.022 mm and the maximum deformation of the sealing groove was 0.505 mm.

关 键 词：焊接变形 数值模拟 焊接顺序 TIG焊 马鞍形焊缝 

分 类 号：TG404[金属学及工艺—焊接]