摘要
毫米波雷达天线罩与壳体通常采用激光透射焊接进行连接,仅当壳体上环形凸台整体温度达到熔点、熔池超过设计间隙,天线罩才能与壳体实现焊接并消除间隙满足安装尺寸。因此,在焊接时,激光束会快速且循环照射焊接面,使壳体环形凸台达到均温的效果。为探究毫米波雷达天线罩与壳体激光透射焊接参数,采用ANSYS Workbench软件建立了PBT塑料激光透射焊接的三维有限元分析模型。采用瞬态热模块,将激光功率转换为高斯热源表达式,通过编写APDL代码实现热源动态加载,完成了天线罩与壳体的激光焊接仿真,仿真结果得到了不同激光功率、不同移动速度下的焊接温度场分布、熔池几何形状。结果表明:当激光功率为120 W、焊接速度为2500 mm/s时,焊接温度达到240~243℃,环形凸台熔池最小深度为0.31 mm,最大深度为0.38 mm。经气密性测试,焊缝满足密封性能要求。
The radome and the shell of millimeter wave radar are usually connected by laser transmission welding.Only when the overall temperature of the annular boss on the shell reaches the melting point and the molten pool exceeds the design gap,the radome can be welded with the shell and eliminate the gap to meet the installation size.Therefore,during welding,the laser beam will rapidly and circularly irradiate the welding surface,so that the annular boss of the shell can achieve the effect of temperature equalization.In order to explore the laser transmission welding parameters of millimeter wave radar radome and shell,the three-dimensional FEA model of PBT plastic laser transmission welding is established using the ANSYS Workbench software.The transient heat module is used to convert the laser power into the expression of Gaussian heat source.The dynamic loading of heat source is realized by writing APDL code.The laser welding simulation of radome and shell is completed.The simulation results obtain the distribution of welding temperature field and the geometric shape of weld pool under different laser power and moving speed.The results show that when the laser power is 120 W and the welding speed is 2500 mm/s,the welding temperature reaches 240-243℃,the minimum depth of the molten pool of the ring boss is 0.31 mm,and the maximum depth is 0.38 mm.Through air tightness test,the welds meet the seal performance requirements.
作者
杨飞
杨竹溪
羊应官
龙辉文
詹传康
YANG Fei;YANG Zhuxi;YANG Yingguan;LONG Huiwen;ZHAN Chuankang(Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401120,China)
出处
《机械工程师》
2025年第7期31-34,共4页
Mechanical Engineer
