压力容器吊耳多层多道焊不同焊接顺序的数值模拟  

Numerical simulation of multi-layer and multi-pass welding of pressure vessels lug with different welding sequences

作　　者：张行[1] 李云涛[1] 王谦[1] 褚亮[1] 李耀荣[2] 李俊东[2] 

机构地区：[1]天津理工大学材料科学与工程学院,天津300384 [2]天津宝成机械制造股份有限公司,天津300350

出　　处：《焊接技术》2015年第12期9-12,1,共4页Welding Technology

基　　金：天津市科技支撑计划项目(14ZCDGGX00790)

摘　　要：采用有限元软件对压力容器吊耳的焊接进行三维多层多道焊仿真模拟,运用生死单元技术对2种不同焊接顺序进行焊接填充仿真,得到不同焊接顺序下焊接接头的温度场、残余应力场以及变形场,对结果进行数值分析及比较,并对性能较好的工艺进行计算及硬度测试验证。结果表明:焊接顺序对残余应力及变形有很大影响,后续道次的焊接对已填充完成的焊缝有预热作用,并消除部分残余应力;焊缝方向中心区域应力水平超过材料屈服强度,为耳板焊接结构易断裂区域;单边依次焊接方案较双边交替焊接方案获得的残余应力小,硬度试验及强度计算结果表明,该方案满足实际工程要求,为实际焊接提供参考依据。Using finite element software to simulate the weld filling of three-dimensional multi-pass welding under two different welding sequence for the pressure vessel welding lug, with the technology of life and death element, the result of temperature field, residual stress field and deformation field of welded joints under different welding sequences were obtained. Analysis and comparison of the results, with test the hardness of the good performance, the results show that welding sequence had a great influence on the residual stress and deformation, Subsequent welding of the weld had the preheating effect, and some of the residual stress were eliminated. The stress level of the weld direction in the center was more than the yield strength of the material, which was easy to fracture of the welded structure. The single side turn had the small residual stress, hardness test and strength calculation results showed that the scheme could meet the practical engineering requirements and provide reference for the actual welding.

关 键 词：压力容器吊耳 多层多道焊 焊接顺序 有限元模拟 

分 类 号：TG457.5[金属学及工艺—焊接] O242.21[理学—计算数学]