Comparative Analysis of Non-Uniformity of Mechanical Properties of Welded Joints of Al – Mg – Si Alloys During Friction Stir Welding and Laser Welding
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The properties of the welded joints of 6082-T6 alloy produced by friction stir welding (FSW) and laser welding (LW) were studied. The maximum temperature and microhardness fields in the friction stir-welded joints were shown to be asymmetrical. The concentrated energy input during laser welding yields a narrow heat-affected zone (HAZ) with sharp changes in mechanical properties. The strength of the FSW joint constitutes 72% and that of the LWjoint—67% of the base metal strength. In case of LW, the minimum hardness of the joint corresponds to the metal of the welded joint, while in case of FSW, it corresponds to the heat-affected zone. At the same maximum heating temperature, the hardness of the heat-affected zone of the friction stir-welded joint is lower compared to laser welding due to substantially lower rates of heating and cooling.
Key wordsfriction stir welding laser welding Al – Mg – Si alloy temperature field welded joint microstructure mechanical properties non-uniformity
This study was performed at the SPPU under the Contract No. 14.Z50.31.0018 with the Ministry of Education and Science of the Russian Federation.
- 1.R. E. Trevisan, D. D. Schwemmer, and D. L. Olson, The Fundamental of Weld Metal Pore Formation. Welding: Theory and Practice, Chap. 3, Elsevier Science Pub. (1990).Google Scholar
- 2.R. J. Shore and R. B. McCauley, “Effect of porosity on high strength aluminum 7039,” Welding J., 49(7), 311 – 321 (1970).Google Scholar
- 4.O. Grong, Metallurgical Modelling of Welding, The Institute of Materials, London (1997), 608 p.Google Scholar
- 6.C. Huang and S. Kou, “Liquation cracking in full-penetration Al – Mg – Si welds,” Welding J., 83(4), 111 – 122 (2004).Google Scholar
- 8.S. Katayama, Handbook of Laser Welding Technologies, Woodhead Publishing, 654 (2013).Google Scholar
- 10.S. W. Kallee, “Industrial applications in friction stir welding,” in: D. Lohwasser and Z. Chen (eds). Friction Stir Welding. From Basic to Applications, Woodhead Publishing, Cambridge (2010), pp. 118 – 163.Google Scholar
- 12.C. A.Weis Olea, “Influence of energy input in friction stir welding on structure evolution and mechanical behaviour of precipitation-hardening in aluminium alloys (AA2024-T351, AA6013-T6 and Al – Mg – Sc),” GKSS-Forschungszentrum Geesthacht GmbH, 149 (2008).Google Scholar
- 15.ASM Handbook, Vol. 9: Metallography and Microstructures ASM International, Materials Park, Ohio, USA (2004), 1184 p.Google Scholar
- 19.V. Ploshikhin, A. Prikhodovskii, M. Makhutin, et al. “Integrated mechanical-metallurgical approach to modeling of solidification cracking in welds,” in: T. Boellinghaus and H. Herold (eds.), Hot Cracking Phenomena in Welds, Springer (2005), pp. 223 – 244.Google Scholar
- 22.A. Fehrenbacher, N. A. Duffie, N. J. Ferrier, et al. “Temperature measurement and closed-loop control in friction stir welding,” in: 8th International Friction Stir Welding Symposium, Timmendorfer Strand, Germany (2010), 19 p.Google Scholar