Influences of pin profile on the macrostructure and mechanical properties of friction stir welded AA6061-T6 alloy T-joints

Majid Alamdari; Mehdi Saeidi; Babak Manafi; Abolfazl Masoumi; Kavan Ghowsi

doi:10.3139/120.110801

Artikel

Influences of pin profile on the macrostructure and mechanical properties of friction stir welded AA6061-T6 alloy T-joints

Majid Alamdari , Mehdi Saeidi , Babak Manafi , Abolfazl Masoumi und Kavan Ghowsi

Veröffentlicht/Copyright: 18. November 2015

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Abstract

Friction stir welding is a solid-state process in which the joining operation is performed while the base materials are not melted and they are merely plasticized. In this study, friction stir welding of the AA 6061-T6 aluminum alloy T-joint has been studied and the influences of the tool pin profile on the macrostructure and mechanical properties of the joints have been investigated. Accordingly, three different pin profiles, such as straight cylindrical, taper cylindrical and square have been utilized. Then the joints have been examined using macroscopic images. Also, the joints have been investigated by tensile and hardness tests. As obtained from the results, the fabricated joints by the cylindrical pin exhibited the maximum tensile strength and hardness due to the homogeneity of material flow and the lack of defects.

Kurzfassung

Rührreibschweißen ist ein Schweißprozess bei dem die Verbindung des Grundwerkstoffes erreicht wird ohne ihn aufzuschmelzen. Er wird nur plastifiziert. In der diesem Beitrag zugrunde liegenden Studie wurde das Reibrührschweißen einer T-Verbindung aus der Aluminiumlegierung AA6061-T6 und die Einflüsse des Werkzeugstift-Profils auf die Makrostruktur und die mechanischen Eigenschaften der Verbindungen untersucht. Dementsprechend sind drei verschiedene Stiftprofile verwendet worden, ein gerader Zylinder, ein Kegel und eine quadratische Form. Danach wurden die Verbindungen anhand von Querschliffen lichtmikroskopisch untersucht. Die Verbindungen wurden außerdem Zugversuchen und Härtemessungen unterzogen. Aus den Ergebnissen lässt sich ableiten, dass die mit dem Zylinderprofil hergestellten Verbindungen aufgrund der Homogenität des Materialflusses und der daraus resultierenden Defektfreiheit die größte Zugfestigkeit und Härte aufweisen.

§Correspondence Address, Mehdi Saeidi, Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran. E-mail: m.saeidi@srbiau.ac.ir

Dipl.-Ing. Majid Alamdari, born in 1984, received his BSc degree in Mechanical Engineering from the Semnan Branch of Azad University (IAU), Iran, in 2007. In 2011, he obtained his MSc from Science & Research Branch of Azad University (IAU) in Tehran. His research interests include friction stir welding, plastic deformation and metal forming processes. Currently, he is a production manager at Radsarma Co. in Tehran.

Dipl.-Ing. Mehdi Saeidi, born in 1988, received his BSc degree in Mechanical Engineering from Saveh Branch of Azad University (IAU), Iran, in 2010. In 2013, he obtained his MSc from Science & Research Branch of Azad University (IAU). His research interests include friction stir welding/processing, severe plastic deformation (SPD) and metal forming processes. Currently, he is a researcher at Science and Research Branch of Azad University (IAU), Tehran.

Dipl.-Ing. Babak Manafi, born in 1987, received his BSc degree in Mechanical Engineering from the Saveh Branch of Azad University (IAU), Iran, in 2010. In 2013, he obtained his MSc degree in Mechanical Engineering from the Branch of Science & Research of Azad University (IAU), Tehran in 2013. His research interests include severe plastic deformation (SPD), finite element method (FEM) and metal forming processes. Currently, he is a lecturer at University of Applied Science and Technology in Karaj, Iran.

Dr. Abolfazl Masoumi, born in 1959, received his MSc degree in Mechanical Engineering from the University of Tehran, Iran, in 1986. In 1995, he obtained his PhD degree in Mechanical Engineering from the University of Leeds, United Kingdom. He is Associate Professor of Mechanical Engineering at University of Tehran. He published more than 100 papers in international journals and conferences in welding, metal forming and CAD/CAM areas.

Dipl.-Ing. Kavan Ghowsi, born in 1984, received his BSc degree in Mechanical Engineering from the Arak Branch of Iran University of Science and Technology, in 2007. In 2011, he obtained his MSc from the Science & Research Branch of Azad University (IAU), Tehran, Iran. His research interests include friction stir welding, plastic deformation and metal forming processes. Currently, he is a technical manager at Nahoran Co. in Tehran.

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Published Online: 2015-11-18

Published in Print: 2015-11-16

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https://doi.org/10.3139/120.110801