Refill Friction Stir Spot Welding (Refill FSSW) of magnesium lithium alloys: effects of air and argon cooling

Zhang, Chengcong; Cao, Junyan; Shirzadi, A. A.

doi:10.1080/13621718.2021.1884801

Cited by 13 publications

(3 citation statements)

References 11 publications

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“…The joining of 1.53-mm ZEK-100 Mg alloy sheet and 1-mm Zn-coated DP600 steel sheet was achieved by Chen et al [35] with the RFSSW process, and the research found that the Zn coated promoted the formation of FeAl 2 at the interface of the joint in the process, thus enhancing the strength of the joint. In order to reduce the oxide inclusions generated in the LZ91 Mg-Li alloys during the RFSSW process, Zhang et al [36] proposed RFSSW with argon cooling, and a joint with flat and smooth surfaces was achieved.…”

Section: Friction Stir Spot Weldingmentioning

confidence: 99%

Review on joining processes of magnesium alloy sheets

Han

Wang

et al. 2021

Int J Adv Manuf Technol

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Magnesium alloy sheets have an increasing proportion of applications in automobiles due to their high specific strength. The usability of traditional welding processes and mechanical joining processes is restricted by the characteristic of magnesium alloy sheets. In order to improve the plasticity of magnesium alloy sheets and realize the reliable joining of magnesium alloy sheets with dissimilar sheets, researchers have conducted a lot of research. In this paper, the existing joining processes of friction stir spot welding, friction stir blind riveting, hybrid self-piercing riveting, and friction self-piercing riveting for magnesium alloy sheets are reviewed; the latest advances of joining process are introduced; and the principle, development, advantages, and shortcomings of each process for improving the plasticity of magnesium alloy sheets are systematically described. Several unaddressed issues in the joining of magnesium alloy sheets are identified. The hybrid of mechanical and solid-state joining processes will be a trend in future development.

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Section: Friction Stir Spot Weldingmentioning

confidence: 99%

Review on joining processes of magnesium alloy sheets

Han

Wang

et al. 2021

Int J Adv Manuf Technol

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“…Air cooling systems have been widely applied to Li‐ion battery packs due to simplicity and electrical safety. Zhang et al 4 proposed an air cooling method for herringbone fin long sleeve battery pack, and proved the effectiveness of the method by comparing with the fin less and sleeve less schemes. Li et al 5 improved the cooling effect of the battery by optimizing the air flow structure and layout of the U‐type air‐cooled battery thermal management system.…”

Section: Introductionmentioning

confidence: 99%

Parametric study and optimization on novel fork‐type mini‐channel network cooling plates for a Li‐ion battery module under high discharge current rates

Shi

Xie

et al. 2021

Intl J of Energy Research

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When a lithium-ion battery works under high current, its working temperature is easy to exceed the allowable working temperature, resulting in the decrease of battery life. This may cause the non-uniformity of the internal working temperature of the battery and affect the working parameters of the battery. Therefore, an effective thermal management system is needed to enhance the thermal performance of the battery, improve the work efficiency, and extend the service life of the battery. In this study, we propose a new type of fork type mini-channel cooling plate based on genetic optimization algorithm to reduce the working temperature of battery and obtain better thermal uniformity.First, the thermal performance of co-current type cooling plates is experimentally and numerically studied. The heat transfer ability of cross flow cooling plates used to cool the Li-ion Battery is evaluated by parametric method. Second, a multi-objective genetic algorithm optimization is finally performed, considering the balance of the maximum value for temperature and pressure drop.Compared with the previous study, the reduction of temperature difference of this cooling plate can be up to 2 C. In contrast, the pressure drop penalty and thermal resistance of the optimized cooling plates can be reduced by 20% and 40%, respectively. Thirdly the thermal performance of a battery module with eight battery cells is also examined numerically. The maximum ΔT of the battery pack among cells is 4.83 C for V = 48 mL/s, which implies that the battery pack can work normally. This study indicates that batteries with the proposed new cooling plates have much better temperature uniformity.

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“…The RFSSW process squeezes the extrusive material into the weld by a complex movement with a probe, a sleeve and a clamping ring [17]. There is no keyhole appeared in the weld after the welding process [18]. However, the RFSSW process is not widely used in industry due to the complexity of the manufacturing equipment [19,20].…”

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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Refill Friction Stir Spot Welding (Refill FSSW) of magnesium lithium alloys: effects of air and argon cooling

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Cited by 13 publications

References 11 publications

Review on joining processes of magnesium alloy sheets

Review on joining processes of magnesium alloy sheets

Parametric study and optimization on novel fork‐type mini‐channel network cooling plates for a Li‐ion battery module under high discharge current rates

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

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