Automatic Welding, 2018, №12



2018 №12 (07)

DOI of Article 10.15407/as2018.12.08

2018 №12 (09)

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Avtomaticheskaya Svarka (Automatic Welding), #11-12, 2018, с. 86-92

Effect of plate thickness on weld speed in friction stir welding of AA6061-T6 Al-alloy plates

G. İpekoğlu¹, Ö. Akçam², G. Çam¹

¹ Iskenderun Technical University. 31200 Iskenderun-Hatay, Turkey. E-mail: guven.ipekoglu@iste.edu.tr, gurel.cam@iste.edu.tr
² GSI SLV-TR Kaynak Teknolojisi Test ve Mesleki Gelişim Merkezi Ltd. Şti., Çiğdem Mah., Gökkuşağı Sitesi, Mavi Blok No:37-38, 06520 Balgat, Çankaya, Ankara, Turkey. E-mail: ozgur.akcam@gsi.com.tr

In this study, it was aimed to determine the weld speeds required in order to obtain defect-free joints in AA6061-T6 alloy plates with two different thicknesses (namely 3,0 and 6,2 mm) by friction stir welding at a constant rotational rate of 1000 rev.min-1. For this purpose, two different stirring tools (one tool for each plate thickness) have been obtained and used to determine suitable weld speed for each plate thickness. The microstructures of the joints obtained were investigated in both macro- and micro-scale, and their mechanical properties were determined by conducting microhardness measurements and tensile testing. The current study clearly indicated that AA6061-T6 alloy plates with different thicknesses can be successfully FS welded provided that suitable stirring tool and weld parameters are used. Moreover, it was also observed that the joint performance value of the thicker plates was somewhat lower than that of the thinner plates. This can be attributed to higher heat inputs required in order to obtain defect-free joints in thicker plates and lower cooling rates after the joining in the case of thicker plates. 42 Ref., 2 Tabl., 7 Fig.
Keywords: friction stir welding, AA6061-T6, plate thickness, microstructure, mechanical properties

Received: 05.09.2018
Published: 06.11.2018

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