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铝/钢无匙孔搅拌摩擦点焊焊接性分析
引用本文:王希靖,张亚州,张忠科,孙学敏.铝/钢无匙孔搅拌摩擦点焊焊接性分析[J].焊接学报,2015,36(1):1-4.
作者姓名:王希靖  张亚州  张忠科  孙学敏
作者单位:兰州理工大学甘肃省有色金属新材料重点实验室, 兰州 730050,兰州理工大学甘肃省有色金属新材料重点实验室, 兰州 730050,兰州理工大学甘肃省有色金属新材料重点实验室, 兰州 730050,兰州理工大学甘肃省有色金属新材料重点实验室, 兰州 730050
基金项目:国家重大专项资助项目(2012ZX04008011)
摘    要:采用自行设计的无匙孔搅拌摩擦点焊方法对6061铝合金和DP600镀锌钢进行点焊(钢上铝下),利用扫描电镜、能谱仪及拉伸试验对接头的微观组织和力学性能进行研究.结果表明,搅拌头旋转频率为1 200 r/min、预热时间为6 s和搅拌针长度为3.2 mm时,接头抗剪载荷可达11.2 k N.接头表面平整美观无匙孔;接头由搅拌区和扩散区组成,搅拌区内钢以弯钩状分布嵌入铝基体,形成牢固的机械连接;扩散区内铝和钢依靠界面上的金属间化合物连接,连接方式为冶金结合.接头断裂位置为扩散区化合物层与铝基体界面处,断口呈河流状的解理台阶,属于脆性断裂.

关 键 词:铝合金/镀锌钢  无匙孔搅拌摩擦点焊  正交试验  力学性能  微观组织
收稿时间:2014/7/5 0:00:00

Welding analyses of friction stir spot welding without keyhole between aluminum alloy and zinc-coated steel
WANG Xijing,ZHANG Yazhou,ZHANG Zhongke and SUN Xuemin.Welding analyses of friction stir spot welding without keyhole between aluminum alloy and zinc-coated steel[J].Transactions of The China Welding Institution,2015,36(1):1-4.
Authors:WANG Xijing  ZHANG Yazhou  ZHANG Zhongke and SUN Xuemin
Affiliation:State Key Laboratory of Ministry of Non-ferrous Metals Advanced Processing and Reuse, Lanzhou University of Technology, Lanzhou 730050, China,State Key Laboratory of Ministry of Non-ferrous Metals Advanced Processing and Reuse, Lanzhou University of Technology, Lanzhou 730050, China,State Key Laboratory of Ministry of Non-ferrous Metals Advanced Processing and Reuse, Lanzhou University of Technology, Lanzhou 730050, China and State Key Laboratory of Ministry of Non-ferrous Metals Advanced Processing and Reuse, Lanzhou University of Technology, Lanzhou 730050, China
Abstract:FSSW without keyhole of Al6061 and DP600 zinc-coated steel was carried out by using the equipment designed by our team (top steel sheet-bottom Al sheet). Using scanning electron microscope, energy spectrometer and tensile test on the microstructure and mechanical properties of joint were studied. The results showed that the mixing head speed was 1200 r/min, the preheating time was 6 s and stirring needle length was 3.2 mm and joint shear resistance reached 11.2 kN. The surface of joint was smoothly without keyhole. Welding joint was composed of the stir zone and the diffusion zone, stir zone to hook shape the distribution of embedded steel in the aluminum matrix and finally form strong mechanical connection. The diffusion zone of aluminum and steel''s connection depended on the interfacial intermetallic compounds. Connection mode was metallurgical combination. The fracture of welding joint''s position was in between of the interface layer and the aluminum substrate. The distribution of river-shaped fracture was cleavage steps, so the mode of fracture belonged to brittle fracture.
Keywords:Al alloy/zinc-coated steel  FSSW without keyhole  orthogonal test  mechanical property  microstructure
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