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| 1 | 附加超声对6061-T6铝合金/Q235钢搅拌摩擦焊搭接工艺优化显示文摘采用超声振动强化搅拌摩擦焊接工艺实现了6 061-T6铝合金和Q235钢异种金属的有效连接,考察了超声能量对焊缝成形、接头组织、力学性能以及焊接载荷的影响.结果表明,施加超声能量可以显著改善焊缝表面成形,增加铝/钢界面区和焊核区的宽度.超声振动细化了焊核区和热力影响区的晶粒组织,改变了搭接接头的断裂机制和断裂位置,提高了接头的力学性能.对焊接过程中焊接载荷的变化进行分析,发现施加超声能量后搅拌头扭矩、焊接轴向力和主轴输出功率均有所下降. | 刘涛 高嵩 肖光春 吴程浩 石磊 孙志平 | 2022 | 焊接学报2022，43，5： | 5 |
| 2 | Hot-cracking susceptibility and shear fracture behavior of dissimilar Ti6Al4V/AA6060 alloys in pulsed Nd:YAG laser welding显示文摘Laser welding of dissimilar titanium/aluminum alloys has been employed at an increasing rate,particularly in the aerospace industry,owing to its advantages in terms of current design flexibility and fuel/cost savings.The major problem with dissimilar Ti/Al welds arises from the difference in the thermal expansion and contraction of the two metals,which leads to hot-cracking susceptibility and the mitigation of the mechanical property after welding.In the present study,pulsed Nd:YAG laser welding of Ti6 Al4 V and AA6060 has been addressed.Hot-cracking susceptibility in the heat affected zone and the shear fracture behavior of the lap joints were investigated through microstructural characterization and mechanical tests.The results indicate that the hot cracking tendency can be reduced by increasing the pulse peak power(7.5–8.5 kW)and the laser point diameter(0.8–1.0 mm)with specific pulse duration and overlap.An alternative control strategy for less hot cracks in the Ti/Al lap joint can be to increase the weld width and decrease the cooling rate during solidification.The shear fracture of the Ti/Al lap joint is likely to occur along the lower side path of the weld interface with decreasing weld surface collapsed amount and increasing aluminum base metal melt depth. | Xin XUE Xinyong WU Juan LIAO | 2021 | Chinese Journal of Aeronautics2021，34，4： | 1 |
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