基于SYSWELD的薄壁箱梁焊接过程模拟仿真  

Simulation of Welding Process of Thin-walled Box Girder Based on SYSWELD

作　　者：方平[1] 余涛 帅歌旺[1] 鄢帅 FANG Ping, YU Tao, SHUAI Gewang, YAN Shuai(Aviation Engineering Institute, Nanchang Hangkong University, Nanchang 330063, Chin)

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《热加工工艺》2018年第3期194-198,共5页Hot Working Technology

摘　　要：建立了低合金结构钢薄壁箱梁模型,校核了双椭球热源模型参数,利用有限元软件SYSWELD模拟其焊接过程,研究了焊接顺序对薄壁箱梁焊接残余变形和残余应力的影响,分析了焊缝和热影响区的组织。结果表明：不同的焊接顺序对薄壁箱梁的整体变形影响较大,变形较大的位置全部在上翼缘板。最大残余应力均分布在焊缝处,且越靠近焊缝,残余应力越大。在所选焊接工艺参数下焊缝和热影响区的组织以贝氏体为主,马氏体其次,有极其微量的残余奥氏体存在。The 3 D model of the low alloy structural steel thin-walled box girder was established, the parameters of the double ellipsoid heat source model were checked and the welding process was simulated by using SYSWELD software. The influence of welding sequence on welding residual deformation and residual stress of the thin-walled box girder was studied and the microstructure of the weld and heat affected zone was analyzed. The results show that the welding sequence has great influence on the overall deformation of the thin-walled box girder, and large deformation positions are all on top flange plate.The maximum residual stress is distributed in the weld, the closer the position to the weld, the greater the residual stress.Under the condition of the selected welding parameters, the microstructure of the weld and heat-affected zone is mainly bainite, and the martensite is the second, and there is a little residual austenite.

关 键 词：薄壁箱梁 残余变形 残余应力 组织 

分 类 号：TG404[金属学及工艺—焊接]