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Microstructure and mechanical properties of friction spot welded 6061-T4 aluminum alloy
Highlights The formation of hook is discussed based on the microstructure characterization. The hook plays a crucial role in determining the mechanical properties. The tensile/shear strength were stable with the variation of processing parameters.
Abstract Friction spot welding (FSpW) is a relatively new solid state joining technology developed by GKSS. In the present study, FSpW was applied to join the 6061-T4 aluminum alloy sheet with 2mm thickness. The microstructure of the weld can be classified into four regions, which are stir zone (SZ), thermo-mechanically affected zone (TMAZ), heat affected zone (HAZ) and the base material (BM), respectively. Meanwhile, defects such as bonding ligament, hook and voids are found in the weld, which are associated to the material flow. The hardness profile of the weld exhibits a W-shaped appearance and the minimum hardness is measured at the boundary of TMAZ and SZ. Both the tensile/shear strength and cross-tension strength reach the maximum of 7117.0N and 4555.4N at the welding condition of the rotational speed of 1500rpm and duration time of 4s. Compared to cross-tension strength, the tensile/shear strength were stable with the variation of processing parameters. Three different fracture modes are observed under tensile/shear loading, which are plug type fracture, shear fracture and plug-shear fracture. There are also there different fracture modes under cross-tension loading, which are plug type fracture (on the upper sheet), nugget debonding and plug type fracture (on the lower sheet).
Microstructure and mechanical properties of friction spot welded 6061-T4 aluminum alloy
Highlights The formation of hook is discussed based on the microstructure characterization. The hook plays a crucial role in determining the mechanical properties. The tensile/shear strength were stable with the variation of processing parameters.
Abstract Friction spot welding (FSpW) is a relatively new solid state joining technology developed by GKSS. In the present study, FSpW was applied to join the 6061-T4 aluminum alloy sheet with 2mm thickness. The microstructure of the weld can be classified into four regions, which are stir zone (SZ), thermo-mechanically affected zone (TMAZ), heat affected zone (HAZ) and the base material (BM), respectively. Meanwhile, defects such as bonding ligament, hook and voids are found in the weld, which are associated to the material flow. The hardness profile of the weld exhibits a W-shaped appearance and the minimum hardness is measured at the boundary of TMAZ and SZ. Both the tensile/shear strength and cross-tension strength reach the maximum of 7117.0N and 4555.4N at the welding condition of the rotational speed of 1500rpm and duration time of 4s. Compared to cross-tension strength, the tensile/shear strength were stable with the variation of processing parameters. Three different fracture modes are observed under tensile/shear loading, which are plug type fracture, shear fracture and plug-shear fracture. There are also there different fracture modes under cross-tension loading, which are plug type fracture (on the upper sheet), nugget debonding and plug type fracture (on the lower sheet).
Microstructure and mechanical properties of friction spot welded 6061-T4 aluminum alloy
Shen, Zhikang (author) / Yang, Xinqi (author) / Yang, Shuo (author) / Zhang, Zhaohua (author) / Yin, Yuhuan (author)
2013-08-06
13 pages
Article (Journal)
Electronic Resource
English
Microstructure and mechanical properties of friction spot welded 6061-T4 aluminum alloy
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