T型接头激光深熔焊热源建模及温度场数值模拟  

Heat Source Model and Numerical Simulation of Laser Full Penetration Welding of T-joint

作　　者：褚振涛[1] 于治水[1] 张培磊[1] 马凯[1] 李凯斌[1] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620

出　　处：《热加工工艺》2015年第3期236-239,共4页Hot Working Technology

基　　金：上海市自然科学基金项目(12ZR1444500);国家自然科学基金项目(51375294);上海市教委创新重点项目(12ZZ186)

摘　　要：为了研究T型接头激光深熔焊热现象,基于激光深熔焊能量分布特点,类比T型接头焊缝几何形貌,抽象出热源模型特征参数,间接考虑小孔效应,建立了新型体积分布式热源模型。应用这一热源模型对T型接头激光深熔焊温度场进行了数值模拟,得到了T型接头激光深熔焊温度场并在三组参数下进行了实验验证,与常用热源进行了比较。结果表明,传统体热源模型不能准确模拟T接头激光深熔焊加工过程,而新型热源模型所得焊缝横截面熔合线轮廓与试验所得T型接头焊缝熔合线吻合良好。新建模型及建模方法对T型接头激光深熔焊热力耦合分析具有一定的指导意义。In order to investigate the thermal phenomena of laser full penetration welding of T-joint, an adaptive model of the heat source is applied to predict the temperature evolution, based on the principle of laser full penetration welding and characteristics of T-joint laser welding. The available heat source models, like double-ellipsoidal and rotary Gaussian modes, are unable to describe laser full penetration welding. With this adaptive heat source model, the finite-element analysis of temperature profile in laser welding is conducted. The results show that the predicted geometry and locus of the fusion line in the laser weld cross-section are in good agreement with the experimental measurements. It lays a solid foundation for the process optimization, metallurgical analysis and thermal stress-strain simulation of laser full penetration welding.

关 键 词：T型接头 激光深熔焊 新型体积热源 温度场 

分 类 号：TG456.7[金属学及工艺—焊接]