对接焊缝数值模拟方法研究  

Study of numerical simulation for butt weld

作　　者：郝淑英[1] 孙永宾[1] 张昆鹏[1] 申俊杰[1] 

机构地区：[1]天津理工大学天津市先进机电系统设计与智能控制重点实验室,天津300384

出　　处：《武汉大学学报（工学版）》2016年第1期110-114,共5页Engineering Journal of Wuhan University

基　　金：天津市自然科学基金重点项目(编号:12JCZDJC28000);天津市自然科学基金项目(编号:12JCYBJC32100);天津市本科教学质量与教学改革研究计划项目(编号:C03-0802)

摘　　要：为了准确模拟对接焊缝的温度场,在分析前人关于双椭球热源模型参数选取方法的基础上结合相关的计算经验提出了比较完善的双椭球热源模型参数选取方法,运用前人的试验数据对其准确性进行了验证;然后对考虑和不考虑焊接过程材料添加的两种模拟方法进行了仿真分析与对比,发现考虑材料添加比不考虑材料添加的算法更合理,其所得熔池形态、温度场及应力场与实际情况更吻合;最后应用数值模拟方法分别模拟了匀速焊接和变速焊接,发现采用变速焊接方法调整起弧阶段的焊接速度,可以避免匀速焊接起弧阶段存在的未焊透焊接缺陷.In order to simulate the temperature field of the butt weld accurately,on the basis of the predecessors＇ work and some computing experience,a better method to select the parameters of the double ellipsoid heat source model was put forward;and it is verified by test data.Then numerical simulation of butt weld were done by two different methods,one is considering material added in welding and the other regardless of material added.We find that it is more reasonable to consider the material adding,which weld pool shape,temperature field and stress distribution match the actual results well.Finally,the variable-speed welding and uniform-speed welding are investigated by numerical simulation method;we find that the variable-speed welding makes it possible to avoid the incomplete penetration weld defect which existing in the uniform speed welding,by adjusting the initial welding speed.

关 键 词：焊接 热源模型 变速焊接 熔池形态 数值模拟 

分 类 号：TG402[金属学及工艺—焊接]