Comparison of process behavior, microstructure and mechanical properties of ultrasound enhanced friction stir welded titanium/titanium joints

Abstract Titanium as a high-performance material offers great potential for wide range of applications with different aspects like lightweight-constructions, biocompatibility well design and is used in various industrial areas the transportation sector or medical sports engineering. To exploit full titanium, there still need innovative efficient joining techniques compared to conventional methods. The process friction stir welding solid-state method able produce high-quality similar joints titanium. Nevertheless, are some challenging when titanium formation oxide layers that affect mechanical properties especially field fatigue negatively. superposition power ultrasound on can address this issue. Therefore, hybrid enhanced was applied Ti6Al4V/Ti6Al4V butt joint configuration reduce amount improve lifetime joints. For configuration, positive impact could be identified by breakup an increase tensile strength 16%. Also stepwise load tests revealed higher estimated welded specimen configuration.