Investigation of tool offset on mechanical properties of dissimilar AA6061-T6 and AA7075-T6 joint in parallel FSW process

Ghiasvand, Amir; Hassanifard, Soran; Jalilian, Maziar Mahdipour; Kheradmandan, Hasan

doi:10.1007/s40194-020-01037-4

Cited by 22 publications

(8 citation statements)

References 20 publications

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“…The directions of rotation of the tool are reverse in two passes to create relative symmetry in the temperature distribution and plastic flow created in the workpiece. According to the direction of rotation of tools in welding passes, this process has two different types [42]. If the direction of the tool rotation in the first and second passes of welding is such that the marginal zones of the welding line are in the RS region and the weld line is entirely in the AS region, the Advancing Parallel-Friction Stir Welding (AP-FSW) is formed and in reverse conditions of the mentioned condition, i.e., when the marginal zones of the weld line are in the AS region and the weld line is in the RS region, the Retreating Parallel-Friction Stir Welding (RP-FSW) is formed.…”

Section: Welding Methodsmentioning

confidence: 99%

“…It was found that the use of this tool increases the peak process temperature and symmetry of the strain distribution and strain rate in the process and reduces the defects of the FSW process. Ghiasvand et al [42] introduced a new two-pass FSW method called P-FSW for welding two dissimilar aluminum alloys AA6061-T6 and AA7075-T6. Welding was performed in two passes with the same welding directions and different rotations of the tool, and in each pass, different offsets were used for the tool.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Mechanical and Microstructural Properties of Welded Specimens of AA6061-T6 Alloy with Friction Stir Welding and Parallel-Friction Stir Welding Methods

et al. 2021

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The present study investigates the effect of two parameters of process type and tool offset on tensile, microhardness, and microstructure properties of AA6061-T6 aluminum alloy joints. Three methods of Friction Stir Welding (FSW), Advancing Parallel-Friction Stir Welding (AP-FSW), and Retreating Parallel-Friction Stir Welding (RP-FSW) were used. In addition, four modes of 0.5, 1, 1.5, and 2 mm of tool offset were used in two welding passes in AP-FSW and RP-FSW processes. Based on the results, it was found that the mechanical properties of welded specimens with AP-FSW and RP-FSW techniques experience significant increments compared to FSW specimens. The best mechanical and microstructural properties were observed in the samples welded by RP-FSW, AP-FSW, and FSW methods, respectively. Welded specimens with the RP-FSW technique had better mechanical properties than other specimens due to the concentration of material flow in the weld nugget and proper microstructure refinement. In both AP-FSW and RP-FSW processes, by increasing the tool offset to 1.5 mm, joint efficiency increased significantly. The highest weld strength was found for welded specimens by RP-FSW and AP-FSW processes with a 1.5 mm tool offset. The peak sample of the RP-FSW process (1.5 mm offset) had the closest mechanical properties to the base metal, in which the Yield Stress (YS), ultimate tensile strength (UTS), and elongation percentage (E%) were 76.4%, 86.5%, and 70% of base metal, respectively. In the welding area, RP-FSW specimens had smaller average grain size and higher hardness values than AP-FSW specimens.

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Section: Welding Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical and Microstructural Properties of Welded Specimens of AA6061-T6 Alloy with Friction Stir Welding and Parallel-Friction Stir Welding Methods

et al. 2021

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“…Friction stir welding (FSW) was one of the relatively novel welding techniques invented at The Welding Institute (TWI) in the UK in 1991 [1,2]. This process is categorized into a group of welding processes called solid-state bonding techniques [3]. The FSW joint is formed using a non-consumable tool that plunges into the workpiece and translates along the weld line [4,5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Tool Positioning Factors on Peak Temperature in Dissimilar Friction Stir Welding of AA6061-T6 and AA7075-T6 Aluminum Alloys

et al. 2022

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Among the emerging new welding techniques, friction stir welding (FSW) is used frequently for welding high-strength aluminum alloys that are difficult to weld by conventional fusion-welding techniques. This paper investigated the effects of tool-positioning factors on the maximum temperature generated in the dissimilar FSW joint of AA6061-T6 and AA7075-T6 aluminum alloys. Three factors of plunge depth, tool offset, and tilt angle were used as the input parameters. Numerical simulation of the FSW process was performed in ABAQUS software using the coupled Eulerian–Lagrangian (CEL) approach. Central composite design (CCD) based on response surface methodology (RSM) was used to analyze and design the experiments. Comparison of the numerical and experimental results showed that numerical simulations were in good agreement with the experimental ones. Based on the statistical model results, plunge depth, tilt angle, and tool offset were the most significant factors on maximum process temperature, respectively. It was found that increasing the plunge depth caused a sharp increase in the maximum process temperature due to increased contact surfaces and the frictional interaction between the tool and workpiece.

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“…Two typical Friction stir welding tools are a shoulder and a pin. The weld quality, mechanical properties, and molecular structures of Friction stir welded are all improved with appropriately built welding equipment [4,5]. A well-designed tool will increase plastic flow, reduce defects, and enhance the mechanical properties of the Welded joints and its surroundings.…”

Section: Introductionmentioning

confidence: 99%

A Productive Friction Stir-Welded Aa 6061 Joints Using Different Pin Tool Profiles Configuration to Grow Mechanical and Microstructural Characteristics

2022

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There are six brand-new dual-pin FSW tools that are displayed, each with a unique combination of Dual Circle, Dual Triangle, Dual rectangle, and Triangle-Rectangle profiles. Combination pins in the shapes of circles, triangles and rectangles were developed. The samples with the welded joints underwent quasi-static testing, and information on stress-strain was gathered. The use of dual pin welding equipment resulted in expanded SZ and improved plastic flow, among other micro-structural changes. The highest tensile strength and ductility were found in the weld connections made using Dual Triangle and Rectangle-Triangle tools. This investigation looks at the effects of tool shapes on the tensile characteristics and micro-structural components in the stir zone and heat-affected zone of friction stir-welded Al 6061 joints.

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Investigation of tool offset on mechanical properties of dissimilar AA6061-T6 and AA7075-T6 joint in parallel FSW process

Cited by 22 publications

References 20 publications

Investigation of Mechanical and Microstructural Properties of Welded Specimens of AA6061-T6 Alloy with Friction Stir Welding and Parallel-Friction Stir Welding Methods

Investigation of Mechanical and Microstructural Properties of Welded Specimens of AA6061-T6 Alloy with Friction Stir Welding and Parallel-Friction Stir Welding Methods

Investigation of the Effects of Tool Positioning Factors on Peak Temperature in Dissimilar Friction Stir Welding of AA6061-T6 and AA7075-T6 Aluminum Alloys

A Productive Friction Stir-Welded Aa 6061 Joints Using Different Pin Tool Profiles Configuration to Grow Mechanical and Microstructural Characteristics

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