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Interlock Friction Stir Weld of Dissimilar Aluminum Alloys AA 7075 T6-AA7475 T7 Using a Novel Asymmetric Dual-Pin Tool: Mechanical Properties and Microstructure Characterization

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Abstract

Friction stir welding of light weight dissimilar aluminium alloys have greater advantage over conventional welding techniques. A new asymmetric dual-pin tool was developed to perform welding of dissimilar AA 7075 T6-AA7475 T7 interlock lap weld design to improve the material joining and mechanical attributes of weld was proposed in this study. For comparison, single-pin cylindrical tool has been considered for welding. The characteristics of welds made by asymmetric dual-pin tool and single-pin tool were investigated by microstructure, hardness and ultimate tensile strength (UTS). It is obvious that welds made by asymmetric dual-pin tool have higher strength with the selected input parameters. The tensile strength of 255 MPa was achieved using novel asymmetric tool at weld speed of 35 mm/min, while single-pin tool produced welds with UTS of 210 MPa at same weld speed. The welds made by novel asymmetric dual-pin tool are defect free and has uniform micro hardness distribution at cross section of joints than joints made using single-pin tool.

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  1. SMEC, VIT-Chennai, Chennai, Tamilnadu, India

    R. Anand & R. Padmanabhan

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Anand, R., Padmanabhan, R. Interlock Friction Stir Weld of Dissimilar Aluminum Alloys AA 7075 T6-AA7475 T7 Using a Novel Asymmetric Dual-Pin Tool: Mechanical Properties and Microstructure Characterization. Metallogr. Microstruct. Anal. 11, 225–233 (2022). https://doi.org/10.1007/s13632-022-00847-w

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  • DOI: https://doi.org/10.1007/s13632-022-00847-w

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