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        Friction Stir Lap Welding of AZ31B and AA6061 Alloys Using Tin as an Inter-Layer

        Anil Bandi,Srinivasa R. Bakshi 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7

        The formation of Mg17Al12and Al3Mg2is inevitable even in solid-state joining of Al and Mg alloys by friction stir welding(FSW). In the present study, the effect of a thin inter-layer of Sn (tin) and FSW parameters (pin length and tool rotationspeed) on the microstructure and strength of friction stir lap welds of 3 mm thick AA6061 Al alloy and AZ31B Mg alloysheets was investigated. A ~ 20 μm thick Sn layer was deposited on AZ31B alloy by displacement plating. The heat generatedduring the welding melted the Sn layer and the rotation action of the tool pushed the molten Sn to the hooks on the advancingside and retreating side. The extent of Mg17Al12and Al3Mg2intermetallic compound formation was reduced with Sninter-layer with limited formation of Mg2Sn. The Sn inter-layer helped improve the lap shear strength at lower tool rotationalspeed (600 RPM) and pin lengths of 3.25 and 3.75 mm compared to joints without Sn inter-layer. Lap welds prepared witha 3.25 mm pin at 600 RPM had a lap shear strength of 245 N/mm which is the highest value reported so far and is 116%higher compared to joints without Sn inter-layer. This was due to elimination of hook at the advancing side and retreatingside and disintegration of intermetallic compounds.

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