车身用铝薄板搅拌摩擦点焊接头的服役性能研究  

Study on Service Performance of Friction Stir Spot Welds of Aluminum Sheet for Vehicle Bodies

作　　者：于贵申 陈鑫[1] 于雪 武子涛 YU Guishen;CHEN Xin;YU Xue;WU Zitao(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China;Volkswagen(Anhui)Automotive Company Limited,Hefei 230088,China;New Energy Development Institute,China First Automobile Company Limited,Changchun 130011,China)

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,吉林长春130022 [2]大众汽车(安徽)有限公司,安徽合肥230088 [3]中国第一汽车股份有限公司新能源开发院,吉林长春130011

出　　处：《湖南大学学报（自然科学版）》2023年第6期53-60,共8页Journal of Hunan University:Natural Sciences

基　　金：国家重点研发计划资助项目(2016YFB0101601-7,2020YFB230350-3);吉林省省校共建项目(SXGJSF2017-2-1-5);吉林大学研究生创新项目(101832020CX128)。

摘　　要：结构中的焊点往往同时承受轴向和切向载荷的作用,而焊点的单向力学性能不能反映焊点的真实服役状态.为此,对比了最优参数下的传统搅拌摩擦焊接(Conventional Friction Stir Spot Welding,CFSSW),无针搅拌摩擦焊接(Probeless Friction Stir Spot Welding,PFSSW)以及扫略搅拌摩擦焊接(Swept Friction Stir Spot Welding,SFSSW)接头的拉剪和剥离力学性能.针对某小型全铝电动汽车,提出了焊点多工况服役性能的评价指标,并对3种焊点的服役性能进行了比较.结果表明,最优参数下的SFSSW接头在车身侧围与顶横梁连接区域的服役性能相较于CFSSW和PFSSW分别提高了28.97%和48.86%.在车身结构的前纵梁连接部分,3种焊点均表现出最高的焊点服役性能.地板横梁与地板纵梁的连接部分表现出最低的焊点服役性能.由此可知,应适当增加焊点的数量以保证结构的安全性.Welds in structures are often subjected to both axial and tangential loads.The mechanical properties of welds in a single direction cannot reflect the real service condition.Therefore,this study compared the tensile shear and peel mechanical properties of Conventional Friction Stir Spot Welding(CFSSW),Probeless Friction Stir Spot Welding(PFSSW)and Swept Friction Stir Spot Welding(SFSSW)joints under the optimal parameters.Moreover,a multi-condition welds service performance evaluation method was proposed for a small all-aluminum electric vehicle.And the service performance of the three types of weld was compared.The results show that the service performance of SFSSW joints in the connection region of body side surround and top cross beam under the optimal parameters was improved by 28.97%and 48.86%,compared with CFSSW and PFSSW,respectively.Moreover,in the front longitudinal beam connected region,the three types of weld showed the highest service performance.Meanwhile,the connecting parts on the floor crossbeam and floor longitudinal beam exhibited the lowest welding service performance,and the number of welding spots needs to be increased appropriately to ensure the structure’s safety.

关 键 词：车身轻量化 搅拌摩擦点焊工艺 铝合金 服役性能 

分 类 号：U463.82[机械工程—车辆工程]