摘要
针对动车组缓冲梁焊接结构,采用SYSWELD软件,模拟了缓冲梁结构焊接过程,研究了焊接残余应力分布规律。测试并建立了A7N01S-T5铝合金和焊材ER5356材料物性数据库,通过SYSWELD软件提供的拟合工具,以双椭球热源模型为热量分布形式,建立了符合现场焊接工艺的热源模型,并分析了不同焊接顺序和焊接结构下缓冲梁结构残余应力大小及变化规律。结果表明,采用现场工艺焊接时,下翼板存在较大的残余应力,而对称焊工艺既能提高焊接效率又能降低上述区域的焊接残余应力。
The welding processes of bumper beam structure of high speed train were simulated to investigate the distribution of welding residual stress based on SYSWELD software.The material properties of A7N01S- T5 aluminum alloy and consumables ER5356 were tested and the material properties databases were established.The parameters of double ellipsoid welding heat source model were calibrated according to the actual welding processes by using the Heat Source Fitting tool in SYSWELD software.The value and distribution of welding residual stress of bumper beam under different welding sequences and welding structures were studied.The results show that large residual stresses appeared in the bottom flange of bumper beam under the actual welding process,the welding efficiency can be improved and the value of the residual tensile stresses in the bottom flange can be reduced when the method of symmetric welding was adopted.
出处
《焊接》
北大核心
2014年第3期42-47,71,共6页
Welding & Joining
基金
青岛四方课题资助项目
