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Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 494851, 8 pages
http://dx.doi.org/10.1155/2014/494851
Research Article

Effect of Laser Welding Parameters on Formation of NiTi Shape Memory Alloy Welds

1College of Materials Science and Engineering, Jilin University, Changchun 130012, China
2Aviation University of Air Force, Changchun 130022, China

Received 30 December 2013; Revised 11 March 2014; Accepted 13 March 2014; Published 3 April 2014

Academic Editor: Kean Aw

Copyright © 2014 Wei Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this work experimental trials of welding of NiTi flat plates with 2.0 mm thickness were conducted using a 4.5 kW continuous wave (CW) Nd:YAG laser. The influences of laser output power, welding speed, defocus amount and side-blow shielding gas flow rate on the morphology, welding depth and width, and quality of the welded seam were investigated. Meanwhile, the effects of heat input on the mechanical and functional properties of welded joints were studied. The results show that laser welding can take better formation in NiTi alloys. The matching curves with laser power and welding speed affecting different formation of welds were experimentally acquired, which can provide references for laser welding and engineering application of NiTi alloy. The heat input has obvious effects on the ultimate tensile strength (UTS) and shape memory behavior of the welded joints.