%0 journal article
%@ 0924-0136
%A Reimann, M., Goebel, J., Gartner, T.M., dos Santos, J.F.

%D 2017
%J Journal of Materials Processing Technology

%P 157-166 
%R doi:10.1016/j.jmatprotec.2017.02.025
%T Refilling termination hole in AA 2198–T851 by refill friction stir spot welding
%U https://doi.org/10.1016/j.jmatprotec.2017.02.025
 
%X A systematic investigation comparing and combining the two friction based processes has shown that refill friction stir spot welding is able to be applied as keyhole closure technique in sheet material and in semi–stationary shoulder bobbin tool friction stir welds. Defect free welds with known microstructural features were achieved. The mechanical performance of keyhole closure welds using refill friction stir spot welding in semi–stationary shoulder bobbin tool friction stir welds is comparable to the performance of keyhole closure welds in bare sheets. High-strength keyhole closure welds with efficiencies of 78 % in terms of ultimate tensile strength were achieved.