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Investigating the effects of process parameters on a titanium friction stir weld

Researcher: Sarah Leigh Baker

Collaborators: Moataz Attallah, Paul Bowen, Simon Bray (Rolls-Royce plc).

Friction Stir Welding (FSW) is a solid-state process which is currently of great industrial interest, and as such is being investigated across a number of different research institutions. Within this project, the use of friction stir welding to join titanium alloys is studied.

One of the main obstacles of successfully producing a FSW joint in titanium alloys is the development of a tool material that can withstand the high temperatures (~> 1000 oC) and stresses of the process without failure. As part of this project, the plunge period of the FSW process is modelled to gain a more detailed understanding on the effect of the tool material and to some extent the tool geometry on the performance of the tool during welding. Microstructural analysis, residual stress development and the mechanical properties of the subsequent titanium friction stir welded joints have also been investigated to build up knowledge on the effect of process parameters on both the tool and weld with the aim to produce defect-free titanium welds.

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