RESEARCH ARTICLE


Study on the Joining of Titanium and Aluminum Dissimilar Alloys by Friction Stir Welding



Yuhua Chen*, 1, Changhua Liu2, Geping Liu1
1 National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China
2 College of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005, China


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© 2011 Chen et al;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China; Tel: +86-791-3863023; Fax: +86-791-3953312; E-mail: ch.yu.hu@163.com


Abstract

Titanium alloy TC1 and Aluminum alloy LF6 were butt jointed and lap jointed by friction stir welding (FSW), and the influence of process parameters on formation of weld surface, cross-section morphology and strength were studied. The results show that, Titanium and Aluminum dissimilar alloy is difficult to be butt joined by FSW, and some defects such as cracks and grooves are easy to occur. When the tool rotation rate is 950 r/min and the welding speed is 118 mm/min, the tensile strength of the butt joint is 131MPa which is the highest. FSW is suitable for lap joining of TC1 Titanium alloy and LF6 Aluminum alloy dissimilar materials, an excellent surface appearance is easy to obtain, but the shear strength of the lap welding joint is not high. At the welding speed of 60 mm/min and the tool rotation rate of 1500 r/min, the lap joint has the largest shear strength of 48 MPa. At the welding speed of 150 mm/min and the tool rotation rate of 1500 r/min, crack like a groove occurs on the interface and the shear strength is zero.

Keywords: Joining of Ti/Al dissimilar alloys, friction stir welding, butt welding, lap welding.