振动时效对超声冲击车辆铝合金焊接接头残余应力的影响研究  

Research on Influence of Vibration Aging Treatment on Ultrasonic Impacted Aluminum Alloy Welding Joints for Car Body Structure

作　　者：吴沛沛[1] 田爱琴[1] 吴影[2] 苟国庆[2] 陈辉[2] 

机构地区：[1]南车青岛四方机车车辆股份有限公司,山东青岛266111 [2]西南交通大学轨道交通关键材料及工艺装备研究中心,四川成都610031

出　　处：《热加工工艺》2014年第7期37-40,共4页Hot Working Technology

基　　金：国家科技支撑计划项目:高速列车车体技术(2009BA G12A04)

摘　　要：由于焊接残余应力对铝合金焊接接头的安全可靠性有较大的影响,因此必须选择合理的方式对铝合金车体关键部位进行残余应力控制处理。本文采用超声冲击的方式对A7N01铝合金焊接接头进行残余应力控制处理,并将试板固定在车辆上上线运行2000 km进行振动时效处理。研究结果表明:超声冲击处理过后的焊接接头纵向和横向应力基本为压应力,且呈现出双沟状应力分布形态,压应力的峰值出现在焊趾位置。经过振动时效后应力释放的值变化趋势呈单峰状,因此振动时效结合超声冲击的双作用模式,可有效降低铝合金焊接接头残余应力。The residual stress has large influence on the welded joints of aluminum alloy, so the rational control technology must be chosen. The ultrasonic impact technology to control the residual stress of A7N01 aluminum welding joints was studied, and the test pieces on the floor of the car body were fixed with 2000km travel so as to analyze the influence of the vibration aging treatment. The results show that the residual stress is compressive residual stress of the welded joints after ultrasonic impact technology and shows dual trench distribution. The peak compressive residual stress is at weld toe. The residual stress is single peak distribution. So the double module of ultrasonic impact technology and vibration aging treatment technology can decrease the residual stress of aluminum welded joints.

关 键 词：残余应力 A7N01铝合金焊接接头 超声冲击 振动时效 

分 类 号：TG404[金属学及工艺—焊接]