Sun Zhuanping, Yang Xinqi, Li Shuxin
Tianjin Key Laboratory of Advanced Joining Technology, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China.
Tianjin Long March Launch Vehicle Manufacturing Co., Ltd., Tianjin 300462, China.
Materials (Basel). 2022 Feb 18;15(4):1525. doi: 10.3390/ma15041525.
In this study, Friction plug welding (FPW) for 8 mm thickness AA2219-T87 sheets were carried out, and defect-free joints were obtained. The geometric size of plug and plate hole, rotational speed and welding force exhibit significant effects on the weld formation. Meanwhile, it is concluded that significant inhomogeneity of microstructure and mechanical properties exists in FPW joints. The recrystallization zone has the highest mechanical properties owing to the fine equiaxed grains and uniformly distributed θ precipitates. The entire plug, thermo-mechanically affected zone and nugget thermo-mechanically affected zone closed to the bonding interface are significantly softened due to the deformation of the grains and θ' precipitate dissolution. The ultimate tensile strength (UTS) and elongation of the FPW joints can reach 359 MPa and 7.3% at 77 K and 305 MPa and 5% at 298 K, respectively.
在本研究中，对8毫米厚的AA2219-T87板材进行了摩擦塞焊（FPW），并获得了无缺陷接头。塞子和板孔的几何尺寸、转速和焊接力对焊缝成形有显著影响。同时，得出摩擦塞焊接头存在显著的微观结构和力学性能不均匀性的结论。再结晶区由于细小的等轴晶粒和均匀分布的θ析出相而具有最高的力学性能。靠近结合界面的整个塞子、热机械影响区和熔核热机械影响区由于晶粒变形和θ'析出相溶解而显著软化。摩擦塞焊接头的极限抗拉强度（UTS）和伸长率在77 K时分别可达359 MPa和7.3%，在298 K时分别为305 MPa和5%。
