PBT与A5052铝合金的激光直接连接工艺参数建模分析与优化  

Modeling Analysis and Optimization of Laser Direct Bonding Process Parameters between PBT and A5052 Aluminum Alloy

作　　者：刘东雷[1] 刘辉辉 李品[1] 刘会霞[1] LIU Donglei;LIU Huihui;LI Pin;LIU Huixia(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《热加工工艺》2021年第23期123-129,共7页Hot Working Technology

基　　金：国家自然科学基金项目(51275219)。

摘　　要：针对热塑性聚合物在汽车轻量化应用中的连接需求,采用半导体光纤激光器对车用材料聚对苯二甲酸丁二醇酯(PBT)与A5052铝合金进行激光直接连接试验研究。为了提高连接强度,对铝合金表面进行激光表面织构预处理。利用响应曲面法建立工艺参数与铝合金表面预处理时间和连接强度的数学模型,分析了焊接功率、焊接速度、织构扫描次数和织构密度对预处理时间及连接强度的交互式影响,并进行优化求解。结果表明,焊接功率-织构密度、焊接功率-焊接速度对焊接强度的交互式影响较大。模型验证和优化结果验证表明,所建模型的预测值与实验值较为吻合,模型是可靠的,对提高连接质量有很好的指导意义。In view of the joining demand of thermoplastic polymers in automotive lightweight applications, the laser direct joining process between PBT and A5052 aluminum alloy was investigated by using semiconductor fiber laser. The surface of the aluminum alloy was pretreated by laser texture treatment to improve the bonding strength. The response surface mathematical models were established between the process parameters and surface pretreatment time of aluminum alloy and joint strength. The interactive effects of welding power, welding speed, texture scanning time and texture density on the pretreatment time and joint strength were analyzed, and the process parameters were optimized. The results show that the welding power-texture density and the welding power-welding speed have great interactive effect on the welding strength. The model validation and optimization result validation show that the predicted value of the response surface model is very close to the experimental value, and the model is reliable, which has a good guiding significance for improving the connection quality.

关 键 词：热塑性聚合物 A5052铝合金 激光直接连接 响应面法 

分 类 号：TG441.2[金属学及工艺—焊接] TG456.7