钎焊工艺对点阵结构残余应力的影响规律研究  

Numerical simulation of influence of brazing process on residual stress field of the lattice structure

作　　者：魏志全[1] 罗云[1] 王宜金 张晓磊 

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580

出　　处：《焊接技术》2016年第11期17-21,98,共5页Welding Technology

摘　　要：基于有限元软件ABAQUS,采用顺次耦合方式,对点阵结构钎焊过程中的温度场和残余应力场进行了数值模拟,并分析了不同工艺参数变化对钎焊残余应力的影响。计算结果表明,由于钎料与母材性能的不匹配,在钎缝部位产生了较大的残余应力,成为危险位置;分阶段加热工艺与直接加热工艺相比,残余应力得到了有效改善,横向应力和纵向应力分别降低了19%和22%;保温时间对钎焊残余应力的影响不大,随着钎焊温度的升高,钎焊残余应力略有增大,而降温速率则是钎焊残余应力的主要影响因素。The brazing temperature field and residual stress field of the lattice structure were simulated in the method of sequential coupling by using finite element software-ABAQUS. The effects of brazing process parameters on the residual stress were investigated. The calculated results showed that large residual stress was generated in brazed joint due to mechanical properties mismatch between base metal and filler metal, which had an impact on the joint strength. For the transverse stress and longitudinal stress, compared the stage-by-stage heating process with direct-heating process, the peak value of residual stress reduced by 19% and 22%. The holding time had little effect on the residual stress, while cooling rate has great influence. With the brazing temperature increasing, the residual stress increased slightly.

关 键 词：钎焊工艺 点阵结构 残余应力 数值模拟 

分 类 号：TG454[金属学及工艺—焊接]