1. G.B. Patent Application No. 9125978.8;Thomas,1991
2. Tool penetration during friction stir spot welding of Al and Mg alloys;Gerlich;J. Mater. Sci.,2005
3. The influence of refill FSSW parameters on the microstructure and shear strength of 5042 aluminium welds;Tier;Int. J. Mater. Prod. Technol.,2013
4. J. Hou, Z. Shen, Y. Chen, N. Zhou, M. Worswick, A. Gerlich, K. Chan, N. Scotchmer, Comparison of Resistance Spot Welding and Refill Friction Stir Welding of Al 7075 Sheets, Technical Conference on Resistance Welding Topics Presented by AWS and the Resistance Welding Manufacturing Alliance (RWMA), April 2014, Atlanta, USA.
5. Preliminary investigation of the microstructure and mechanical behaviour of 2024 aluminium alloy friction spot welds;Amancio-Filho;Mater. Trans.,2011