摘要
对2524铝合金薄板进行搭接搅拌摩擦点焊试验,探究轴肩压入量对FSSW焊接接头组织与性能的影响。结果表明:随压入量增加,飞边增多,上板减薄严重,有效连接宽度逐渐增大,有效厚度逐渐减小;焊核区硬度随压入量增加逐渐增大;在单向拉伸试验中,接头最大剪切载荷随压入量增加,先增大后减小,压入0.6 mm时达到最大值,为4 092 N;接头存在低压入量剪切焊核断裂和高压入量撕裂上表面断裂两种模式;断口存在大量韧窝和细小弥散分布的第二相粒子,接头呈韧性断裂。
In this paper,the friction stir spot welding(FSSW)joints experiment of 2524 aluminum alloy sheet was carried out to explore the influence of plunge depth on the microstructure and performance of shoulder. The results show that with the increase of radial feed quantity,the flash increases,the thickness of upper plate decreases seriously,the effective connection width increases gradually,and the effective thickness decreases gradually. The microhardness of weld nugget zone increases with the increase of plunge depth. In the unidirectional tensile test,the shear strength of the joint increases first and then decreases with the increases of the plunge depth,reaching the maximum value of 4 092 N when the plunge depth is 0.6 mm. There are two fracture modes in the joints:shear weld nugget zone fracture at low plunge depth and upper surface fracture at high plunge depth. There are a lot of dimples and small dispersed second-phase particles in the fracture,ductile fracture can be observed on the joint.
作者
胡一杰
孙有平
何江美
李旺珍
HU Yijie;SUN Youping;HE Jiangmei;LI Wangzhen(School of Mechanical and Transportation Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2020年第1期52-56,共5页
Ordnance Material Science and Engineering
基金
国家自然科学基金（51864006）
广西自然科学基金（2016GXNSFDA380008）
柳州市科学研究与技术开发计划(2017BD20301)
关键词
2524铝合金
搅拌摩擦点焊接头
焊接工艺
力学性能
断裂行为
2524 aluminum alloy
friction stir spot welding joints
welding technology
mechanical properties
fracture properties
