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Advances in Materials Science and Engineering
Volume 2016, Article ID 4567940, 9 pages
Research Article

Effect of Modified Pin Profile and Process Parameters on the Friction Stir Welding of Aluminum Alloy 6061-T6

1Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo (UMSNH), Santiago Tapia No. 403, Col. Centro, 58000 Morelia, MICH, Mexico
2Instituto de Investigaciones Metalúrgicas, UMSNH, Edificio U, Ciudad Universitaria, Gral. Francisco J. Mugica S/N, Felicitas del Rıo, 58030 Morelia, MICH, Mexico

Received 10 August 2016; Revised 27 September 2016; Accepted 4 October 2016

Academic Editor: Hongchao Kou

Copyright © 2016 J. C. Verduzco Juárez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This work deals with the effect of a new “bolt-head” pin profile on the friction stir welding performance of the aluminum alloy 6061-T6, compared to traditional pin profiles. Friction stir welding parameters such as the tool rotation speed and the welding speed were investigated together with the different pin profiles; the results show that the new “bolt-head” pin profile leads to better mechanical properties of welded specimens. The pin profiles used in this work were the straight square (SS), straight hexagon (SH), taper cylindrical (TC), and the straight hexagon “bolt-head” (SHBH). It was found that the last pin profile improves the material flow behavior and the uniform distribution of plastic deformation and reduces the formation of macroscopic defects on the welded zone. Mechanical tensile tests on welded specimens were performed to determine the tensile strength: the specimens welded with the SHBH pin profile have shown the highest mechanical properties. An approach is presented for material flow on this aluminum alloy using the SHBH pin profile, which is related to the improvement on the resulting mechanical properties.