Al Alloy Tailor Welded Blank Fabrication by Friction Stir Welding: Effect of Double-Pass

Autor: Tanveer Majeed, Arshad Noor Siddiquee, Yashwant Mehta
Rok vydání: 2021
Předmět:
Zdroj: Journal of Materials Engineering and Performance. 31:410-423
ISSN: 1544-1024
1059-9495
DOI: 10.1007/s11665-021-06161-w
Popis: Friction stir welding (FSW) in butt joint configuration between 6.35 mm thick plates of AA2024-T3 and 2.5 mm thick plates of AA7475-T7 dissimilar alloys is addressed using T4 tool steel with a tapered cylindrical pin having scrolled shoulder. In this experimental study, the effect of double-pass FSW on joint properties has been investigated in detail. The weld microstructure and mechanical properties of FSWed joints were characterized. Scanning electron microscopy and x-ray energy-dispersive spectroscopy were employed to analyze the distribution and nature of precipitates. The temperature rise and traverse load during the FSW process were evaluated. Experimental results indicated the significant increase in grain size by double-pass FSW. Moreover, the hardness value decreases with the second pass, and the hardness dropped significantly in the heat-affected zone due to grains coarsening and change in precipitate morphology caused by increased heat input by double-pass FSW. The overall reduction in joint strength was found to be 4.8% by second pass FSW.
Databáze: OpenAIRE
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