车用动力电池箱体镁合金构件焊接分析  

Welding Analysis of Magnesium Alloy Box for Automotive Driving Battery

作　　者：高培虎[1] 付瑞涛 高鑫 杨伟[1] 李建平[1] 杨忠[1] 郭永春[3] 路拥庆 贾璐 赵丹 GAO Peihu;FU Ruitao;GAO Xin;YANG Wei;LI Jianping;YANG Zhong;GUO Yongchun;LU Yongqing;JIA Lu;ZHAO Dan(School of Materials and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China;Inner Mongolia North Heavy Industries Group Co.,Ltd.,Baotou 014033,China;School of Armament Science and Technology,Xi'an Technological University,Xi'an 710021,China;Shanxi Diesel Engineering Co.,Ltd.,Datong 035600,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021 [2]内蒙古北方重工业集团有限公司,内蒙古包头014033 [3]西安工业大学兵器科学与技术学院,陕西西安710021 [4]山西柴油机工业有限责任公司,山西大同035600

出　　处：《热加工工艺》2022年第9期137-141,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51771140);陕西省科技创新团队项目(2017KCT-05);陕西省重点研发计划项目(2019ZD LGY05-09);陕西省教育厅服务地方专项科研计划项目(10J C022);榆林科技局项目(2019-121)。

摘　　要：针对新能源电动车用动力电池箱体结构减重的要求,选用AZ31镁合金薄板,采用等离子弧焊接制造车用电池箱体。对焊接接头进行了组织和性能分析,并通过ANSYS软件对焊接后的电池箱体进行模拟评价其承载后的寿命。结果表明:AZ31镁合金焊缝组织为α-Mg固溶体和晶界处呈点状析出的β-Mg_(17)Al_(12)相。焊缝处显微硬度均值为70.3 HV。焊接接头抗拉强度均值为185 MPa,达到母材的82.2%,接头断裂形式为脆性断裂。模拟结果表明,焊接丁字接头处和箱体内部挡板所受应力与变形量较大,箱底所受应力和变形量较小。电池箱体在101~147 MPa载荷下的寿命为1.335×10^(6)~8.994×10^(7)周次,可满足日常车用电池箱体的使用要求。Aiming at the requirements of weight loss of the battery box structure for new energy electric vehicles,AZ31magnesium alloy plate was used to manufacture the power battery box by plasma welding.The microstructure and properties of the welded joints were investigated,and the life of the welded box under loading was simulated and evaluated through ANSYS software.The results show that the weld microstructure of the AZ31 magnesium alloy isα-Mg solid solution andβ-Mg_(17)Al_(12)precipitated around the grain boundaries in dot shape.The mean microhardness of the AZ31 weld zone is 70.3 HV,and the mean tensile strength of the welded joint is 185 MPa,which reaches 82%of the base metal.The fracture mode of the joint exhibits brittle fracture.The simulation results show that the stress and deformation of the welded joint and the internal baffle of the box are bigger than those of the box at the bottom.The life of the battery box is 1.335×10^(6)-8.994×10^(7)cycles under the load of 101-147 MPa,which can meet the daily use requirements of vehicle battery box.

关 键 词：电池箱体 镁合金 等离子弧焊接 寿命 

分 类 号：TG456.2[金属学及工艺—焊接] TG407