Guo Weibing, Leng Xuesong, Luan Tianmin, Yan Jiuchun, He Jingshan
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China.
Ultrason Sonochem. 2017 May;36:354-361. doi: 10.1016/j.ultsonch.2016.12.002. Epub 2016 Dec 2.
High strength aluminum alloys are extremely sensitive to the thermal cycle of welding. An ultrasonic-promoted rapid TLP bonding with an interlayer of pure Zn was developed to join fine-grained 7034 aluminum alloys at the temperature of lower 400°C. The oxide film could be successfully removed with the ultrasonic vibration, and the Al-Zn eutectic liquid phase generated once Al and Zn contacted with each other. Longer ultrasonic time can promote the diffusion of Zn into the base metal, which would shorten the holding time to complete isothermal solidification. The joints with the full solid solution of α-Al can be realized with the ultrasonic action time of 60s and holding time of only 3min at 400°C, and the shear strength of joints could reach 223MPa. The joint formation mechanism and effects of ultrasounds were discussed in details.
高强度铝合金对焊接热循环极其敏感。开发了一种以纯锌为中间层的超声促进快速TLP连接方法，用于在低于400°C的温度下连接细晶7034铝合金。超声振动能够成功去除氧化膜，铝和锌接触时会生成Al-Zn共晶液相。较长的超声时间可促进锌向母材中的扩散，这将缩短完成等温凝固所需的保温时间。在400°C下，超声作用时间为60s且保温时间仅为3min时，可实现具有α-Al完全固溶体的接头，接头的剪切强度可达223MPa。详细讨论了接头形成机制及超声的作用效果。
