激光穿透焊热源模型的研究  

Study on Laser Penetration Welding Heat Source Model

作　　者：孔茗[1,2] 傅戈雁[2] 石世宏[2] 宋晟 Kong Ming;Fu Geyan;Shi Shihong;Song Sheng(Suzhou Institute of Industrial Technology,Suzhou,Jiangsu 215104,China;Soochow University,Suzhou,Jiangsu 215100,China;Shanghai Civil Aviation College,Shanghai 200232,China)

机构地区：[1]苏州工业职业技术学院,江苏苏州215104 [2]苏州大学,江苏苏州215100 [3]上海民航职业技术学院,上海200232

出　　处：《应用激光》2019年第6期961-965,共5页Applied Laser

基　　金：江苏高校品牌专业建设工程资助项目(项目编号:PPZY2015B186);江苏省高等职业院校教师专业带头人高端研修项目(项目编号:2018GRGDYX031);苏州市重点实验室资助项目(项目编号:SZS201815)。

摘　　要：基于激光穿透焊的工艺特性和热源特点,建立了新型的高斯面热源+三维锥体热源的组合式热源模型。先采用正交试验法探索五个模型参数对焊缝熔深和熔宽的影响,筛选出权重比较大的f1、ze、re三个参数。然后,基于Weldox960钢激光焊接试验结果,用模式搜索法对混合热源模型进行了反演计算,将反演后获得的模型参数带入模型进行熔池温度场的模拟。结果表明,计算结果与试验结果吻合度非常好,证明高斯面热源和三维锥体热源的混合热源能够有效的模拟激光焊过程中的热流分布。另外,还发现相比于离焦量而言,三个模型参数和功率的关系比较明显。Based on the process and heat source characteristics of laser penetration welding,a new combined heat source model of Gaussian surface heat source and 3 D cone heat source was established.Firstly,the orthogonal test method is used to explore the influence of five model parameters on the weld penetration and the width of the weld,and the three parameters f1,ze and re with larger weights are selected.Then,based on the laser welding test results of Weldox960 steel,the mixed heat source model is inversely calculated by the pattern search method,and the model parameters obtained after the inversion are brought into the model to simulate the molten pool temperature field.The results show that the calculated results agree well with the experimental results,which proves that the mixed heat source of Gaussian surface heat source and three-dimensional cone heat source can effectively simulate the heat flow distribution during laser welding.In addition,it is also found that the relationship between the three model parameters and power is more obvious than the amount of defocus.

关 键 词：激光 穿透焊 热源模型 低合金高强钢 

分 类 号：TG456.7[金属学及工艺—焊接]