Microstructure and Mechanical Properties of Welds of Al – Mg – Si Alloys After Different Modes of Impulse Friction Stir Welding
Welded joints of aluminum alloy 6082-T6 formed by the method of impulse friction stir welding are studied. The effect of the power and frequency of the pulses on the microstructure and mechanical properties of the welded joints is determined. Application of an additional pulse during the welding affects the surface quality and the shape of the weld, the distribution of the oxide layer and of particles of the hardening phase, and the grain size in the zone of dynamic recrystallization.
Key wordsimpulse friction stir welding power and frequency of pulses microstructure mechanical properties Al – Mg – Si alloy
The work has been performed at the Peter the Great St. Petersburg Polytechnic University within Agreement No. 14.Z50.31.0018 with the Ministry of Education and Science of the Russian Federation.
The authors are sincerely grateful to Sebastian Boltz (Department of Metal Science and Technology of Materials of the Brandenburg University of Technology) for the assistance in the scanning electron microscope studies.
- 1.V. Michailov, Impuls-Rührreibschweißen (Impulse Friction Stir Welding), DE 199 53 260.5.Google Scholar
- 2.W. M. Thomas, E. D. Nicholas, J. C. Needham, et al., International Patent Application No. PCT_GB92_02203, GB Patent Application No. 9125978.8 (1991).Google Scholar
- 5.V. Michailov, C. Hantelmann, and A. Kloshek, “Impulsrührreibschweißen—Ein Verfahren mit neuen Möglichkeiten,” in: Große Schweißtechnische Tagung, DVS Band 275 (2011), pp. 171 – 176.Google Scholar
- 14.L. Karlsson, L.-E. Svensson, and H. Larsson, in: Proc. 5th Int. Conf. on Trends inWelding Research, Pine Mountain, GA, USA, June 1 – 5, ASM Int. (1998), pp. 574 – 579.Google Scholar
- 17.C. A. W. Olea, L. Roldo, J. F. dos Santos, and T. R. A. Strohaecker, “A sub-structural analysis of friction stir welded joints in an AA6056 Al-alloy in T4 and T6 temper conditions,” 454 – 455, 52 – 62 (2007).Google Scholar
- 18.C. A. Weis Olea, Influence of Energy Input in Friction Stir Welding on Structure Evolution and Mechanical Behavior of Precipitation-Hardening in Aluminum Alloys (AA2024-T351, AA6013-T6 and Al – Mg – Sc) (2008).Google Scholar
- 20.W. B. Lee, Y. M. Yeon, and S. B. Jung, “Evaluation of the microstructure and mechanical properties of friction stir welded 6005 aluminum alloy,” Mater. Sci. Technol., 19, 513 – 518 (2003).Google Scholar