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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Solid State Diffusion Bonding of Metals and Alloys
Presentation Title Microstructural evolution and mechanical properties of lap-jointed Ti-6Al-4V plates by pin-less friction stir Spot welding
Author(s) Hyojin Park, Yong Chae Lim, Hahn Choo, Suhong Zhang, Anming Hu, Scott A Rose, Zhili Feng
On-Site Speaker (Planned) Hyojin Park
Abstract Scope Ti-6Al-4V has excellent mechanical properties and corrosion resistance that will be attractive for aerospace applications. However, very limited researches have been conducted for joining of titanium alloys using a solid-state welding process. In the present work, we applied a novel pinless friction stir spot welding technique to spot join Ti-6Al-4V sheets with a lap joint configuration. Frictional heat generated underneath of flat tool diffused into the interface of two titanium sheets and finally produced solid-state bonding. Various welding parameters were applied and evolution of metallurgical bonding size at joint interface was measured from cross-sectional view. Microhardness on the welded samples were measured and correlated with microstructures. Mechanical lap shear tensile testing was conducted to assess the bonding strength of Ti-6Al-4V specimens. Finally, the boding mechanism is discussed based on solid state diffusion.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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