卷边接头激光钎焊复合热场模型的数值计算  

Numerical Calculation of Composite Thermal Model of Laser Brazing Flange Butt Joint

作　　者：李绍伟[1,2] 于治水[1,2] 张培磊[1,2] 李晓靓[1,2] 仇丁丁 刘晓鹏[1,2] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]高强激光智能加工装备关键技术产学研开发中心,上海201620

出　　处：《材料导报》2015年第18期127-130,145,共5页Materials Reports

基　　金：国家自然科学基金(51375924);上海市自然科学基金(12ZR1444500);上海市科委地方高校能力建设项目(13160501200);上海市教委创新项目(14YZ139);上海工程技术大学校基金(2012gp21);上海工程技术大学研究生科研创新项目(14KY0507;14KY0509)

摘　　要：为了研究卷边接头激光钎焊热现象,进行了母材为镀锌板,CuSi3作为钎料的激光钎焊实验。基于激光钎焊原理和卷边接头焊缝成型特点,通过有限元分析法对激光钎焊温度场进行了数值模拟,采用高斯双椭球复合热源模型模拟了钎料融化铺展流动的传热行为,模型考虑了材料热物理属性随温度变化的问题以及相变潜热、辐射和对流对传热的影响,对不同激光钎焊工艺参数下的温度场进行计算,结果表明:当激光功率为1200 W,焊接速度为1.5m/min,离焦量为30mm时,卷边接头的峰值温度和温度梯度较低,对于获得成形质量良好的钎焊接头更为有利。In order to study the heat phenomenon of laser brazing of the flange butt join, the experiments of la-ser brazing were carried out, in which the base metal was galvanized steel sheets and （3uSi3 is used as tiller metal. I he numerical simulation of temperature field was carried on by the finite element method, based on the forming characte- ristics of the flange butt joint and the principle of laser brazing. The heat transfer behavior of the solder spreading flow was simulated by the composite heat source model of gauss double ellipsoid. The model considered the thermal physical properties of material with temperature changing and the effects of the latent heat, radiation and convection on heat transfer. Temperature field of different process parameters were calculated. The results show that： the peak tempera- ture and temperature gradient on the joint are lower when the laser power is 1200 W, the welding speed is 1.5 m/min, defocusing amount is 30 mm It is more favorable to form the brazed ioint of good quality.

关 键 词：激光钎焊 卷边接头 数值模拟 温度场 工艺参数 

分 类 号：TG402[金属学及工艺—焊接]