| 摘要: |
| 对2219-T87铝合金搅拌摩擦焊缝进行摩擦塞补焊工艺试验，对塞补焊接头的焊缝成形、显微组织、显微硬度和抗拉强度进行了观察和测试，对拉伸断口进行了扫描电镜观察.结果表明，在7 500 r/min的焊接转速和40~55 kN的焊接压力下可获得无缺陷摩擦塞补焊接头；塞补焊接头沿垂直于搅拌焊缝方向的最大抗拉强度和断后伸长率分别可以达到336 MPa和8%，分别相当于母材抗拉强度和断后伸长率的73.9%和66.7%；在母材和塞棒之间的底部结合面是最薄弱的区域，如何控制该区域的结合强度是影响摩擦塞补焊接头拉伸性能的关键因素. |
| 关键词: 摩擦塞补焊 焊接工艺 微观组织 力学性能 |
| DOI：10.12073/j.hjxb.2019400165 |
| 分类号:TG455 |
| 基金项目: |
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| Microstructure and mechanical properties of friction plug welding for friction stir welded aluminum alloy |
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LIU Kaixuan1, SUN Zhuanping1,2, YANG Xinqi1, DU Bo1, SONG Jianling2
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1.Tianjin Key Laboratory of Advanced Joining Technology, School of Materials Science and Engineering, Tianjin University,, Tianjin 300072, China;2.Tianjin Long March Rocket Manufacture Co., Ltd., Tianjin 300462, China
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| Abstract: |
| Friction plug welding for AA2219-T87 friction stir welds were performed, the macro/micro structures, hardness distributions and tensile strength were observed and tested, and the tensile fracture was observed by scanning electron microscope. The main findings are as follows:With 7500rpm rotational speed and axial force 40~55 kN can obtain defect-free plug welded joint; The ultimate tensile strength (UTS) and elongation of FPW joint in perpendicular direction can reach 336 MPa and 8%, respectively, approximately 73. 9% and 66. 7% being equivalent to that of base metal; The weakest bonding regions are always produced at the bottom bonding interface between the BM and PM and how to control the connection quality of the bottom bonding interface should be the key factor affecting the tensile properties of the friction plug welding joint. |
| Key words: friction plug welding welding process microstructure mechanical property |
