铝合金/碳纤维增强热塑性复合材料的激光对接焊研究  

Aluminum Alloy/Carbon Fiber Reinforced Thermoplastic Laser Butt Welding

作　　者：叶逸云 贾少辉 焦俊科[2] 束学道[1] Ye Yiyun;Jia Shaohui;Jiao Junke;Shu Xuedao(College of Mechanical Engineering and Mechanics,Ningbo University,Ningbo,Zhejiang 315211,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo,Zhejiang 315201,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211 [2]中国科学院宁波材料技术与工程研究所,浙江宁波315201

出　　处：《中国激光》2020年第10期46-54,共9页Chinese Journal of Lasers

基　　金：中国科学院青年创新促进会资助项目(2017343);国家自然科学基金“两化融合”联合基金(U1609208);国家商用飞机制造工程技术研究中心创新基金(COMASFGS201736734)。

摘　　要：采用激光搅拌焊接对7075铝合金与碳纤维增强热塑性复合材料(CFRTP)进行对接焊,分析了焊接工艺参数对接头连接强度的影响规律;对焊接接头的力学性能进行了测试,分析了影响接头强度的因素和接头的失效形式。结果表明:焊接速度对接头强度的影响最大,之后依次为离焦量、激光功率、搅拌振幅、搅拌频率和夹具气压;在最佳参数下得到的接头的连接强度为11.7 MPa,在此情况下接头断裂发生在CFRTP表层,接头的失效形式为CFRTP基体撕裂;测量了焊接时接头处的温度变化规律,温度过高或过低都会降低接头的强度;适当降低焊接速度能延长接头的高温存在时间,增加接头强度。Laser stir welding is used herein to perform butt welding of 7075 aluminum alloy and carbon fiber reinforced thermoplastic (CFRTP), and the effect of the welding process parameters on the joint strength is analyzed. The mechanical properties of the welded joint are tested, and the factors affecting the joint strength and the failure mode of the joint are analyzed. Results show that the welding speed has the greatest influence on the joint strength, followed by the defocusing amount, laser power, stirring amplitude, stirring frequency, and clamp pressure. Under optimal parameters, the joint strength is 11.7 MPa. In this case, the fracture of the joint occurs in the surface layer of CFRTP, and the failure mode of the joint is the tearing of the CFRTP matrix. The temperature change law of the joint during the welding is measured, and the strength of the joint is reduced if the temperature is extremely high or low. Proper welding speed can prolong the high temperature time of the joint welding, increasing the joint strength.

关 键 词：激光技术 碳纤维复合材料 7075铝合金 激光对接焊 焊接参数 

分 类 号：TG456.7[金属学及工艺—焊接]