Improving hook characterization of friction stir lap welded Al alloy joint using a two-section stepped friction pin

Xu, Rongzheng; Cui, Shenglin; Li, H.; Hou, Yanxi; Wei, Zhicheng

doi:10.1007/s00170-019-03476-w

Cited by 18 publications

(3 citation statements)

References 22 publications

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“…Arab et al [21] discovered that the coefficient of friction stepped tool profiles with base material are responsible for grain refinement in the nugget zone as well as improved mechanical properties when compared to conventional tools. Xu et al [22] discovered that stepped pin tool profiles can achieve a stable interfacial morphology for friction stir lap welding joints of aluminum alloy under various process parameters. Emamian et al [23] investigated the effects of square, conical, threaded cylindrical, and stepped conical shapes on temperature and tensile strength in AA 6061 Alloy FSW.…”

Section: Fig 1 Schematic Of Friction Stir Welding Processmentioning

confidence: 99%

Mathematical and experimental examination of the effect of the stepped pin tool profile on the characterization of AA 6061-T6 underwater friction stir welding

Wakchaure¹,

Thakur²

2022

Metall Mater Eng

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This research paper presents the mathematical model to design a stepped pin profile tool and its durability index. A mathematical model is being developed by considering tools that should generate the same heat as conventional conical tools and stepped tools by varying the shoulder to pin diameter ratio (D/d). Aluminum alloy AA6061-T6 with a thickness of 6 mm fabricated using a butt-type weld configuration and newly developed conical stepped pin profile tools with water as a cooling medium. The result shows that a conical stepped tool shows better mechanical properties of the welded joints compared with a conventional conical tool. When compared to other stepped conical pin profile tools, one with a (D/d) of 3 has superior mechanical and microstructural properties and as the D/d ratio increases, the tool pin durability index falls.

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Section: Fig 1 Schematic Of Friction Stir Welding Processmentioning

confidence: 99%

Mathematical and experimental examination of the effect of the stepped pin tool profile on the characterization of AA 6061-T6 underwater friction stir welding

Wakchaure¹,

Thakur²

2022

Metall Mater Eng

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“…To study the influence of heat input on the joint performance, the rotational speeds then reached 1400 and 2000 r/min. Moreover, to investigate the effects of tool geometry on mitigating defects, welding tools (T2 and T3) with two stepped sections 30 were introduced. Their platform shapes of tool's first section were convex and concave respectively, and their geometries and dimensions are described in Figure 2(b) and (c), and Table 2.…”

Section: The Welding Proceduresmentioning

confidence: 99%

Friction stir butt-lap welding of A7N01P-T4 aluminum alloy: Efforts to mitigate defects and the resultant mechanical properties

Wei

Jiang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Butt-lap configuration of aluminum alloys was friction stir welded under various tool offsets, rotational speeds, and tool geometries. The tool offset was introduced to mitigate the inherent retreating side hook. As the probe was placed inwards, the retreating side hook was mitigated, but a severe S-line was formed. Since the inherent retreating side hook was difficult to further mitigate, the S-line was selected to be mitigated by increasing the rotational speed. But an excessive rotational speed (2000 r/min) could cause a severe upward-bending retreating side hook, which decreased the effective plate thickness. Subsequently, two-section stepped probes were employed to mitigate the defects. The S-line and retreating side hook were both mitigated and its ultimate tensile strength (369 MPa) reached 91% of the base material.

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“…Besides the butt joint, the lap joint can be fabricated using the FSW process, and the FSW process of the lap joint can be named friction stir lap welding (FSLW) [12,13]. For the Al/steel FSLW joint, the bonding mechanisms are dominated by metallurgical bonding and mechanical bonding [14].…”

Section: Introductionmentioning

confidence: 99%

Improved Interface Morphology and Failure Load of Ultrasonic-Assisted Friction Stir Lap Welding Joint of 2024 Aluminum Alloy to 304 Stainless Steel

Han,

Yu,

Yan

et al. 2024

Metals

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Achieving high-strength welding joint of aluminum to steel is a highly pressing and challenging task in the manufacturing industries, and friction stir lap welding (FSLW) has advantages for joining these two metals. To further heighten the strength of dissimilar aluminum and steel metals (Al/steel) FSLW joint, the ultrasonic-assisted FSLW (UAFSLW) process was used, and the upper 2024-T4 aluminum alloy and the lower 304 stainless steel were chosen as research object. The results show that the addition of ultrasound eliminates the micro pores, changes the aluminum-rich intermetallic compounds (IMCs) into the iron-rich IMCs and enhances the micro and macro mechanical interlocking structures along the Al/steel lap interface. Under the rational IMCs layer thickness lower than 1.5 μm, the UAFSLW joint has the failure load higher than the traditional FSLW joint. The maximum failure load of UAFSLW joint reaches 7.06 kN, and the loading capacity of this joint is higher than that of reported Al/steel traditional FSLW joint. The UAFSLW process is an effective way to fabricate the high-strength Al/steel lap joint.

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Improving hook characterization of friction stir lap welded Al alloy joint using a two-section stepped friction pin

Cited by 18 publications

References 22 publications

Mathematical and experimental examination of the effect of the stepped pin tool profile on the characterization of AA 6061-T6 underwater friction stir welding

Mathematical and experimental examination of the effect of the stepped pin tool profile on the characterization of AA 6061-T6 underwater friction stir welding

Friction stir butt-lap welding of A7N01P-T4 aluminum alloy: Efforts to mitigate defects and the resultant mechanical properties

Improved Interface Morphology and Failure Load of Ultrasonic-Assisted Friction Stir Lap Welding Joint of 2024 Aluminum Alloy to 304 Stainless Steel

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