1. M. Mahoney, S. Sanderson, Z. Feng, R. Steel, S. Packer, and P. Higgins, “Approaches to Consistently Achieve Full Penetration in Pipeline Steel Welds Using Friction Stir Welding”, Proceedings of the 9th International Friction Stir Welding Symposium, Huntsville, Alabama, May 2012.
2. A. Kumar, D.P. Fairchild, M.L. Macia, T.D. Anderson, H.W. Jin, R. Ayer, N. Ma, A. Ozekcin, and R.R. Mueller, “Evaluation of Economic Incentives and Weld Properties for Welding Steel Pipelines Using Friction Stir Welding”, Proceedings of the Twenty-first (2011) International Offshore and Polar Engineering Conference, Maui, Hawaii, USA, June 19–24, 201 l,vol.4, pp. 460–467.
3. D. P. Fairchild, S. J. Ford, A. Kumar, N.E. Nissley, N. E. Biery, and M.I. Macia, “Butt Weld and Method of Making Using Fusion and Friction Stir Welding”, US Patent No. 7,874,471 B2, Jan. 25, 2011.
4. Q. Liu, R. Steel, J. Peterson, S. Horman, M. Collier, D. Marshall, J. Davis, and M. Mahoney, “Advances in Friction Stir Welding Tooling Materials Development,” Proceedings of the Twentieth (2010) International Offshore and Polar Engineering Conference, Beijing, China, ISOPE, 2010, vol. 4., pp. 298–302.
5. C. Sorensen and B. Nielsen, “Exploring Geometry Effects for Convex Scrolled Shoulder, Step Spiral Probe FSW Tools,” Friction Stir Welding and Processing V, Edited by R. Mishra, M. Mahoney, and T. Lienert, TMS 2009, San Francisco, California, February 2009, pp. 85–92.