An experimental insight of friction stir welding of dissimilar AA 6061/Mg AZ 31 B joints

N Rajesh Jesudoss Hynes, M Vivek Prabhu, P Shenbaga Velu, R Kumar, R Tharmaraj, Muhammad Umar Farooq, Catalin Iulian Pruncu

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Abstract

In the present scenario, aerospace and automobile industries depend on lightweight materials such as magnesium and aluminum alloys because of their great balance between mechanical properties and weight ratio. Despite these benefits during the joining process of these dissimilar materials by welding, many challenges arises. The prominent one is related to the low melting points of these lightweight metals which make it almost impossible the joining using conventional arc welding techniques. To tackle this challenge, Friction Stir Welding (FSW) can be considered as a promising candidate tool. In this study, to demonstrate the FSW performances of joining two dissimilar materials we have investigated the joining of AA 6061 and Mg AZ 31 B using a built-in house a modified milling machine. The dissimilar combinations of AA 6061 and Mg AZ 31 B joints were successfully joined by embedding different welding conditions and varying the offset distance. The mechanical performances were evaluated by conducting specific mechanical tests such as micro-hardness, tensile, and impact tests, respectively. To explain the mechanical results, we have applied optical microscopy observation on the microstructure associated with the bonding location. The results prove that the strength of the Friction Stir Welded joints is much higher as compared to other techniques especially in terms of dissimilar metals.

Original languageEnglish
Number of pages11
JournalProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
Early online date31 Aug 2021
DOIs
Publication statusE-pub ahead of print - 31 Aug 2021

Keywords

  • aluminum
  • friction stir welding
  • magnesium
  • mechanical properties

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