杜波¹, 杨新岐¹, 孙转平^1,2, 王东坡¹
AuthorsHTML:杜波¹, 杨新岐¹, 孙转平^1,2, 王东坡¹
AuthorsListE:Du Bo¹, Yang Xinqi¹, Sun Zhuanping^1,2, Wang Dongpo¹
AuthorsHTMLE:Du Bo¹, Yang Xinqi¹, Sun Zhuanping^1,2, Wang Dongpo¹
Unit:1. 天津大学天津市现代连接技术重点实验室，天津 300350；2. 天津长征火箭制造有限公司，天津 300451
Unit_EngLish:1．Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300350, China
2．Tianjin Changzheng Rocket Manufacturing Co., Ltd., Tianjin 300451, China
Abstract_Chinese:采用摩擦塞补焊工艺, 对8 mm厚的2219-T87铝合金TIG焊缝进行焊接实验, 采用光学显微镜、扫描电子显微镜观察接头的焊缝成型、显微组织和强化相转变, 通过硬度测试、拉伸试验、断口观测研究接头的力学性能和断裂特征. 结果表明：摩擦塞补焊接头可分为塞棒区、塞棒热力影响区、再结晶区、热力影响区、热影响区和母材区/TIG焊缝区6部分; 接头热影响区和热力影响区的强化相粗化, 发生局部软化, 垂直于TIG焊缝方向的最低硬度(95.1 HV)出现在热力影响区, 平行于TIG焊缝方向的最低硬度(75.3 HV)出现在热影响区; 接头的抗拉强度可达321.3 MPa, 断后伸长率可达2.8% , 分别为母材的72.2% 和28.0% ; 拉伸试样断裂位置为热力影响区, 断口呈剪切韧窝, 属于塑性断裂.
Abstract_English:Friction plug welding(FPW)experiments were performed on an 8 mm thick 2219-T87 aluminum alloy TIG weld. The weld formation，microstructure and strengthening phases were observed by optical microscope and scanning electron microscope. The mechanical properties and fracture morphology were studied by hardness test，tensile test and fracture observation. The results show that FPW joint can be divided into six parts，which are plug metal，plug thermo-mechanically affected zone，recrystallized zone，thermo-mechanically affected zone，heat affected zone and base metal/TIG weld. Strengthening phases coarse and local softening were observed in the thermo-mechanically affected zone and heat affected zone. The minimum hardness(95.1 HV)appears in the thermo-mechanically affected zone perpendicular to the TIG weld，and the minimum hardness(75.3 HV)appears in the heat affected zone parallel to the TIG weld. The tensile strength and elongation of FPW joint can reach 321.3 MPa and 2.8% ，are equal to 72.2% and 28.0% of the base metal，respectively. Tensile specimens fracture at thermo-mechanically affected zone. The fracture morphology shows shear dimples，belonging to plastic fracture.
Keyword_Chinese:摩擦塞补焊; 2219-T87铝合金; TIG焊缝; 微观组织; 力学性能
Keywords_English:friction plug welding; 2219-T87 aluminum alloy; TIG weld; microstructure; mechanical property

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