Effect of the welding parameters and tool configuration on micro- and macro-mechanical properties of similar and dissimilar FSWed joints in AA5754 and AZ31 thin sheets

Simoncini, Michela; Forcellese, Archimede

doi:10.1016/j.matdes.2012.04.057

Cited by 94 publications

(38 citation statements)

References 30 publications

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“…Uematsu et al [20] also reported that refilling process improved tensile strength by about 30%. Many persons demonstrated that weld made with pinless tool had higher strength than that made with conventional tool [1,13,[50][51][52]. While Cox et al [12] reported that tensile strength of welds made with a pinless tool was on average 90% of conventional FSSW, for swing FSSW, Yan et al [21] showed that tensile strength increased by about 40% compared to conventional FSSW.…”

Section: Tensile-shear Strength Of Fssw Jointsmentioning

confidence: 99%

Friction Stir Spot Welding: A Review on Joint Macro- and Microstructure, Property, and Process Modelling

Yang

Tian

2014

Advances in Materials Science and Engineering

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Friction stir spot welding (FSSW) is a very useful variant of the conventional friction stir welding (FSW), which shows great potential to be a replacement of single-point joining processes like resistance spot welding and riveting. There have been many reports and some industrial applications about FSSW. Based on the open literatures, the process features and variants, macro- and microstructural characteristics, and mechanical properties of the resultant joints and numerical simulations of the FSSW process were summarized. In addition, some applications of FSSW in aerospace, aviation, and automobile industries were also reviewed. Finally, the current problems and issues that existed in FSSW were indicated.

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Section: Tensile-shear Strength Of Fssw Jointsmentioning

confidence: 99%

Friction Stir Spot Welding: A Review on Joint Macro- and Microstructure, Property, and Process Modelling

Yang

Tian

2014

Advances in Materials Science and Engineering

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“…FSW is acknowledged as an effective joining technology for lightweight materials, such as aluminum alloys, that are usually difficult to weld, or even unweldable by fusion technologies. Nowadays, FSW is applied to several aluminum alloy systems for a variety of industrial application, from automotive, to aerospace, to leisure and technology components [1,2,3]. FSW sheet blanks are joined by the action of a rotating pin tool getting in contact with the top surface of the sheets, and then by moving the pin along the welding line with a set tilt angle.…”

Section: Introductionmentioning

confidence: 99%

Post-FSW Cold-Rolling Simulation of ECAP Shear Deformation and Its Microstructure Role Combined to Annealing in a FSWed AA5754 Plate Joint

et al. 2019

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Friction stir welds are considered reliable joints for their lack of voids, cracks and distortions. When compared to the base material, friction stir welding (FSW) joints typically exhibit finer grain structured (especially at the nugget zone, NZ). Similarly, refined grain structure can also be obtained by severe plastic deformation (SPD) techniques, such as equal channel angular pressing (ECAP). In fact, the fine grain structures produced within the NZ of FSW or friction stir processed (FSP) materials are usually coarser than the ones achieved by ECAP. The former is characterized by lower dislocation density, higher high-angle boundary fraction and different mechanical strength, compared to what can be obtained by ECAP. In this study, a dedicated cold-rolling (CR) set-up, specifically designed to simulate an ECAP-equivalent shear deformation, was used to further refine the grain structure of FSW AA5754 sheets. The effect of ECAP-equivalent deformation induced by CR in a 2 mm-thick AA5754-H111 FSW joint was investigated. FSW was carried out at two different rotational (ω) and translational (v) welding speeds, 600 rpm, 200 mm/min and 1800 rpm, 75 mm/min, respectively. FSW sheets were then CR to obtain an equivalent shear strain of ε ~ 1.08, that is equivalent to 1-ECAP pass carried out with an internal die channels intersecting at an angle φ = 90° with a curvature extending over an angle Ψ = 20°. By CR, the sheet thickness reduced only by ~20%. The role of annealing on the FSW and CR plastically deformed AA5754 was also investigated. This was applied either prior or after FSW, and it resulted that whenever it follows the FSW, the mean volume fraction of dispersoids and Mg-rich particles is higher than the case of annealing preceding the FSW process. On the contrary, it was found that the annealing treatment had a minimal role on the dispersoids and particles mean size. The here reported post-FSW ECAP-simulated deformation, obtained by a customized CR process, showed sheet integrity and a significant concurrent grain size refinement.

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“…Manufacturing of multi-sheet structures obtained by assembling two or more blanks, also using different materials and/or thicknesses, is the industrial field able to obtain the greatest benefits by FSW. Another area of interest is represented by the joining of un-weldable alloys through fusion technologies [1,[9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cold Rolling on the Mechanical Properties and Formability of FSWed Sheets in AA5754-H114

Casalino

Mehtedi

Forcellese

et al. 2018

Metals

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The effect of cold rolling, performed after friction stir welding (FSW), on the mechanical properties and formability of joints in AA5754-H114 aluminium alloy was investigated. Friction stir welding was carried out on 2.5 mm thick sheets with constant values of rotational and welding speeds of 1200 rpm and 100 mm/min, respectively. Then, FSWed workpieces were cold rolled, with the rolling direction perpendicular to the welding line, in order to obtain height reductions ranging from 0.1 to 0.5 mm. Cold rolling with the same height reductions was also carried out on the base material in the as-received condition. The mechanical properties and formability of both friction stir welded joints and base material, before and after cold rolling, were evaluated by means of the uniaxial tensile and hemispherical punch tests. The nominal stress vs. nominal strain and punch force vs. punch stroke curves were analysed in detail. Finally, the scanning electron microscope fractography was used to evaluate the fractured surface of tensile samples.

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Effect of the welding parameters and tool configuration on micro- and macro-mechanical properties of similar and dissimilar FSWed joints in AA5754 and AZ31 thin sheets

Cited by 94 publications

References 30 publications

Friction Stir Spot Welding: A Review on Joint Macro- and Microstructure, Property, and Process Modelling

Friction Stir Spot Welding: A Review on Joint Macro- and Microstructure, Property, and Process Modelling

Post-FSW Cold-Rolling Simulation of ECAP Shear Deformation and Its Microstructure Role Combined to Annealing in a FSWed AA5754 Plate Joint

Effect of Cold Rolling on the Mechanical Properties and Formability of FSWed Sheets in AA5754-H114

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