Influence of welding process on the properties of dissimilar titanium alloy weldments: a review
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JMST Advances https://doi.org/10.1007/s42791-020-00034-4
REVIEW
Influence of welding process on the properties of dissimilar titanium alloy weldments: a review Massab Junaid1 · Taqi Ahmad Cheema1 Received: 12 December 2019 / Revised: 15 June 2020 / Accepted: 16 July 2020 © The Korean Society of Mechanical Engineers 2020
Abstract The extensive use of titanium alloys in a variety of complex industrial applications may be attributed to their properties of high strength-to-weight ratio, corrosion resistance and high temperature strength. Recently, the use of dissimilar titanium alloys has become popular to achieve contrasting characteristics in a single unit. In the fabrication of the structures, joining methods such as welding hold the key in the attainment of the desired characteristics. The present study is aimed at reviewing various state-of-the-art processes used for welding of dissimilar titanium alloys. In particular, the influence of different welding methods such as gas tungsten arc welding (GTAW), laser and electron beam welding on the microstructure, mechanical properties and other characteristics of dissimilar weldments of α, α + β and β titanium alloys has been emphasized. The underlying phenomena that govern the effect of weld processing parameters on the mechanical strength, microstructure and weld joint quality of the alloys were exploited. Moreover, detailed investigations on the fusion zone porosities and evolution of intermetallic concept at the interfacial regions have been examined. Furthermore, different remedial approaches to enhance the joint quality such as beam offsetting, process hybridization, aging and post-weld heat treatments are investigated thoroughly. The latest trends in dissimilar welding of titanium alloys to upheave further research in this area have been reported in the context of their application in industrial applications. Graphic abstract
* Taqi Ahmad Cheema [email protected]; [email protected] 1
Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences and Technology, Topi 23460, Pakistan
1 Introduction With the evolution of technology, the demand to achieve excellence in engineering products has also increased. Multifunctionality is one such requirement that can be achieved
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by combining different materials in a single product. Riveting, shrink fitting and welding are some of the processes used in the industry for joining different materials. Among these, welding is preferred, particularly in high temperature and high-pressure applications such as pressure vessels and aircraft structures because of the enhanced sealing with high strength requirements. However, structural integrity in terms of long-term service delivery may be compromised. In particular, the welding of dissimilar alloys may lead to incompatibility issues at the interface of the weld joint because of the contrasting material properties, such as thermal conductivity, thermal expansion and elastic modulus. The difference in aforesaid properties of di
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