基于超声波焊接工艺的AZ31B接头组织及力学性能研究  

Study on microstructure and mechanical properties of AZAZ31B joint based on ultrasonic welding technology

作　　者：王重阳 安钰坤 杨思一[1] 宋春达 袁建军 WANG Chongyang;AN Yukun;YANG Siyi;SONG Chunda;YUAN Jianjun(School of Mechanical Engineering,Shandong University of Technology,Zibo 255000,China;Shandong Hong Yu Ventilator Co.Ltd.,Zibo 255000,China;Shandong Meiling Meilida Fan Co.Ltd.,Zibo 255000,China)

机构地区：[1]山东理工大学机械工程学院,山东淄博255000 [2]山东鸿宇风机有限公司,山东淄博255000 [3]山东美陵美力达风机有限公司,山东淄博255000

出　　处：《兵器材料科学与工程》2023年第1期55-62,共8页Ordnance Material Science and Engineering

基　　金：国家自然科学基金(51904179);山东省自然科学基金(ZR2019BEM004);山东省精密制造与特种加工重点实验室资助项目;淄博市校城融合发展项目(2019ZBXC022)。

摘　　要：AZ31B镁合金易氧化、耐蚀性差,为避免高温对其焊接接头质量的影响,用超声波焊接工艺制备镁合金焊接接头,研究不同焊接能量下接头界面温度、接头形貌及力学性能。结果表明:随焊接能量增加,焊接接头界面温度和塑性变形单调增加且出现了波浪状、漩涡状形貌,当焊接能量达3 500 J时接头处出现明显裂纹;接头显微硬度随焊接能量增加先增后降,焊接能量为500、1 500、2 500、3 500 J时,界面结合区的硬度比母材分别提高17%、25%、33%、28%;随焊接能量增加,接头剪切力在2 500 J达到峰值后降低,接头断裂形式由界面断裂转变为沿焊接区域边缘断裂。AZ31B magnesium alloy is a kind of metal material that is easily oxidized and has poor corrosion resistant. To avoid the influence of high temperature on the quality of its welded joint,the welded joint of magnesium alloy was prepared by ultrasonic spot welding. The interface temperature,joint morphology and mechanical properties of the joint under different welding energies were studied. The results show that with the increase of welding energy,the interface temperature and the degree of plastic deformation at the welding joint monotonously increases,and wavy and vortex shapes appear at the welding interface. When the welding energy reaches 3 500 J,obvious cracks appear in the welding zone. With the increase of welding energy,the microhardness of the welded joint first increases and then decreases. When the welding energy is 500 J,1 500 J,2 500 J,and 3 500 J,the microhardness of the interfacial bonding region is 17%,25%,33%,and 28% higher than that of the base metal respectively. With the increase of welding energy,the joint shear force reaches a peak at 2 500 J and then decreases. The fracture form of joint changes from interface fracture to fracture along the edge of welding area.

关 键 词：超声波焊接 焊接能量 AZ31B合金 再结晶 塑性变形 

分 类 号：TG453[金属学及工艺—焊接]