ANALYSIS AND CHARACTERIZATION OF FORMING BEHAVIOR ON DISSIMILAR JOINTS OF AA5052-O TO AA6061-T6 USING UNDERWATER FRICTION STIR WELDING

K. Tejonadha Babu, S. Muthukumaran, C. Sathiya Narayanan and C. H. Bharat Kumar
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K. Tejonadha Babu: Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli 620 015, India
S. Muthukumaran: Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli 620 015, India
C. Sathiya Narayanan: #x2020;Department of Production Engineering, National Institute of Technology, Tiruchirappalli 620 015, India
C. H. Bharat Kumar: Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli 620 015, India

Surface Review and Letters (SRL), 2020, vol. 27, issue 03, 1-14

Abstract: The effects of underwater friction stir welding (UFSW) on mechanical properties, strain hardening behavior, and formability of dissimilar materials of AA5052-O and AA6061-T6 welded joints were investigated. The mechanical properties of the UFSW joints exhibited higher strength and higher joint efficiency than the conventional friction stir welded joints (CFSW). The maximum joint efficiency of 73% has been attained for UFSW joints, which is due to the effect of welding atmosphere. The hardness of the stir zone (SZ) and heat affected zone (HAZ) are also obtained higher for the UFSW joints. Moreover, the hardening capacity, strain hardening exponent and formability of the UFSW joints were greatly improved over the CFSW joints. The improvement in mechanical properties of the UFSW joints is mainly due to faster cooling rate during welding. The microstructural characteristics revealed the formation of fine grains in the UFSW joints compared to the CFSW joints.

Keywords: Underwater friction stir welding; tensile strength; microstructure; strain hardening rate; formability (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X1950121X

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