Effect of Rotational Speed on Microstructure and Mechanical Properties of Refill Friction Stir Spot Welded 2024 Al Alloy

Li, Zhengwei; Gao, Shan; Ji, Shude; Yue, Yumei; Chai, Peng

doi:10.1007/s11665-016-1999-2

Cited by 36 publications

(19 citation statements)

References 22 publications

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“…However, the fact in this investigation is that the grain size changes slightly with plunge depth. A possible explanation for the decreased hardness is that the long welding time will lead to coarser precipitates in SZ at large sleeve plunge [29].…”

Section: Hardness Distributionmentioning

confidence: 99%

Effect of Sleeve Plunge Depth on Interface/Mechanical Characteristics in Refill Friction Stir Spot Welded Joint

Sun

Zhou

Zhang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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Refill friction stir spot welding was employed to produce 6061-T6 aluminum alloy joints with different sleeve plunge depths. The interface characteristics of joint-line remnant and hook are investigated by optical and scanning electron microscopy. The joint-line remnant consists of primary bonding region and secondary bonding region, and two types of hook can be identified as downward hook and upward hook. Tensile shear results demonstrate that joint-line remnant and hook make interaction effects on tensile shear properties. The optimal joint is achieved when sleeve plunge depth was 2.0 mm with the corresponding failure load of 8673.4 N. Three different types of fracture mode are exhibited in joints produced at different sleeve plunge depths, which are closely related with the morphology of interface characteristics.

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Section: Hardness Distributionmentioning

confidence: 99%

Effect of Sleeve Plunge Depth on Interface/Mechanical Characteristics in Refill Friction Stir Spot Welded Joint

Sun

Zhou

Zhang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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“…Stir zone (SZ) microstructures of the FSSW joints produced using the cylindrical pin and step pin at various tool rotational speeds are presented in Figures 14 It can be seen that increasing tool rotational speed tends to grains coarsening the microstructures [32]. Referring to Figures 14 and 15, it can be seen the microstructures produced using the step pin are coarser than those produced using the cylindrical pin.…”

Section: Macro and Microstructuresmentioning

confidence: 96%

Effect of Pin Geometry and Tool Rotational Speed on Microstructure and Mechanical Properties of Friction Stir Spot Welded Joints in AA2024-O Aluminum Alloy

2021

IJE

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In the present study, the effects of pin geometry and tool rotational speed on the microstructure and mechanical characteristics of the AA2024-O friction stir spot welding (FSSW) joint were investigated.Two different types of pin geometries, namely cylindrical and step pins, and three different rotational speeds of 900, 1400, and 1800 rpm were used in the friction stir spot welding joint. The microstructure observation, hardness measurements, and shear tests were conducted. Results showed that both pin geometry and rotational speed gave a remarkable effect on the microstructure and maximum shear load of the weld joints. For both pin geometries, the hook height and width of the fully bonded region (FBR) increased by increasing the rotational speed. The weld joint produced by a cylindrical pin exhibits higher values in the hook height and width of the FBR than using a step pin. Furthermore, the highest value in a maximum shear load was obtained at a rotation speed of 1400 rpm for both cylindrical and step pins. Another finding is that the maximum shear loads of FSSW joints produced with a cylindrical pin are higher than that made using a step pin.

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“…Resistance spot welding (RSW) is the most used joining process in the automotive industry which has been widely used for spot joining of low carbon, high strength and coated steel [7,8]. However, there are welding defects such as thermal cracking, porosity and slagging in the RSW process for aluminum alloy welds, which decreases the mechanical properties of the joint [9,10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Performances Analyses on Probeless Friction Stir Spot Welds of AA6061-T6 Aluminum Sheets

Chen

Zitao

et al. 2021

Preprint

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Probeless friction stir spot welding (PFSSW) is a variation of conventional friction stir spot welding (CFSSW), which solves the keyhole defect in CFSSW welds. In this work, four types of probeless tools were designed based on helix and spiral feature: small curvature helix (involute tool, IT), large curvature helix (archimedes tool, AT), spiral line (scroll tool, ST) and no feature (flat tool, FT). AA6061-T6 sheets with a thickness of 1.5 mm were welded using the designed probeless welding tools. The effect of tool shapes on the microstructure and mechanical properties of friction stir spot welded AA 6061-T6 aluminum alloy sheets was investigated using different rotational speeds, plunging depths and dwell times. The Taguchi method was utilized to obtain the optimal welding parameter combination for the four tools. And, the tensile-shear mechanical properties of FSSW specimens were characterized under the optimal parameters. The results show that a basin-shaped profile appeared in the weld metallography using the groove tools. The tensile shear failure load (TSFL) of IT (~6.97 kN) was higher than that of ST (~6.49 kN), AT (~6.19 kN) and FT (~5.67 kN), sequentially. Three different fracture modes, interfacial fracture, plug fracture and mixed-mode fracture were observed in the tensile-shear tests of weld specimens.

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Effect of Rotational Speed on Microstructure and Mechanical Properties of Refill Friction Stir Spot Welded 2024 Al Alloy

Cited by 36 publications

References 22 publications

Effect of Sleeve Plunge Depth on Interface/Mechanical Characteristics in Refill Friction Stir Spot Welded Joint

Effect of Sleeve Plunge Depth on Interface/Mechanical Characteristics in Refill Friction Stir Spot Welded Joint

Effect of Pin Geometry and Tool Rotational Speed on Microstructure and Mechanical Properties of Friction Stir Spot Welded Joints in AA2024-O Aluminum Alloy

Microstructure and Mechanical Performances Analyses on Probeless Friction Stir Spot Welds of AA6061-T6 Aluminum Sheets

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