Microstructure and failure mechanisms of refill friction stir spot welded 7075-T6 aluminum alloy joints

Shen, Zhikang; Yang, Xinqi; Zhang, Zhaohua; Cui, Lei; Li, Tielong

doi:10.1016/j.matdes.2012.08.026

Cited by 199 publications

(144 citation statements)

References 17 publications

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“…The result of the dynamic recrystallisation caused by high strain and the intense thermal cycle during welding, causing solubilisation of the precipitates and the ageing afterwards [3]. The TMAZ is concentrated below the periphery of the sleeve and consists of elongated grain structures due to moderate deformation and frictional heating as concluded by Shen et al [5]. The HAZ undergoes, as the name implies, only a thermal cycle caused by the frictional heating.…”

Section: 2mentioning

confidence: 97%

“…Both are found at the path of the sleeve plunging into the workpiece. Shen et al [5] also noticed voids inside the weld nugget, stating that void formation is mainly due to poor material flow caused by inappropriate welding parameter combinations. Shen et al [5] also stated that the voids become smaller with increasing welding time and larger with increasing rotation speed.…”

Section: 2mentioning

confidence: 99%

“…Weld properties A typical cross-section of a FSpW weld nugget is depicted in figure 2.2 and consists of 4 distinct zones, each with different microstructures and axi-symmetrical to the tool axis [5]. The approximate locations of these zones can also be seen in Figure 2.3.…”

Section: 2mentioning

confidence: 99%

“…In between, an elevated hardness is observed in the stir zone [6]. Shen et al [5] noticed that the intense stirring in the region below the space between the pin and the sleeve causes even finer grains than in the bulk of the SZ. The hardness in the TMAZ is seen as a slope connecting the SZ and the HAZ.…”

Section: 2mentioning

confidence: 99%

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Experimental investigation of the weldability of high strength aluminium using friction spot welding

Kolba

Faes

Waele

2016

SCAD

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Abstract:Friction spot welding is a technique for joining lightweight aluminium and magnesium alloys in the overlap configuration by means of frictional heat and mechanical work and has a high potential for industrial applications. As this is a very recent technique, little information is available regarding the evaluation and optimisation of process parameters for specific material combinations. The process has been used to investigate the weldability of the high strength aluminium alloy EN AW-7475-T761, aiming to produce high quality joints in terms of mechanical performance and microstructure. More specific, the influence of the plunge depth, rotation speed and welding time was investigated. The paper first shortly describes the process and continues with the results of the microhardness, static tensile and optical microscopy tests.

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Section: 2mentioning

confidence: 97%

Section: 2mentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation of the weldability of high strength aluminium using friction spot welding

Kolba

Faes

Waele

2016

SCAD

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“…The authors of the paper [11,12] analyzed the influence of 15 parameters combination on the mechanical properties and microstructure of the RFSSW joints made of aluminium alloy 6181-T6 with a thickness of 1.7 mm. The analysis of the joints made of aluminum alloy 7xxx was shown in [13]. Whereas studies of RFSSW joints made of aluminum alloy 2xxx were presented in [14].…”

Section: Deformacja Plastyczna Wybranych Połączeń Rfssw Podczas Rozcimentioning

confidence: 99%

The Plastic Deformation of RFSSW Joints During Tensile Tests / Deformacja Plastyczna Wybranych Połączeń RFSSW Podczas Rozciągania

Lacki¹,

Derlatka²

2015

Archives of Metallurgy and Materials

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The dynamic development of the friction stir welding (FSW) technology is the basis for the design of durabe joints inter alia in the aviation industry. This technology has a prospective application, especially for the aluminum alloys. It is suitable for a broad spectrum of permanent joints. The joints obtained by FSW technology are characterized by good mechanical properties. In this paper, the friction stir spot welding joints were analysed. The example of a structure made using this technology were presented. The lap joints made of 2mm Al 6061-T6 sheets were the investigation subject. The different spot welds arrangements were analysed. The tensile test were performed with optical deformation measurement system, which allow to obtain the plastic deformation field on the sample surface. The plastic strain graphs for the characteristic line passing through the maximum deformation were registered and presented. The experimental results were compared to the FEM numerical analysis. The numerical models were built with 3D-solid elements. The boundary conditions, material properties and geometry of the joints were identical as during experimental investigation. The mechanism of deformation of welded joints during tensile test was described and explained. It has been found that the arrangement of the spot welds with respect to the tensile direction has an important influence on the behaviour and deformation of lap joint.

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Mechanical performance optimization of similar thin AA 7075‐T6 sheets produced by refill friction stir spot welding

Yamin

Awang

Suhuddin

et al. 2020

Materialwissenschaft Werkst

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Refill friction stir spot welding was applied to weld similar thin AA 7075-T6 aluminum alloy sheets in a spot-like joint configuration without a keyhole. The welds were produced using a small tool consisting of sleeve and probe with diameters of 6 mm and 4 mm, respectively. Design of experiment was employed to optimize the welding parameters in terms of the cross tensile strength by using Box Behnken Design. Based on analysis of variance, it can be concluded that plunge depth strongly affects the mechanical performance of the weld. Optimal welding parameters in terms of rotational speed, plunge depth and speed are identified to reach a cross tensile strength of up to 660 N.Keywords: Friction stir spot welding / similar weld / thin sheets / small tools / tensile strength Schlüsselwörter: Rühr-Reib-Schweißen / artgleiches Schweißen / dünne Bleche / kleine Werkzeuge / Zugfestigkeit Friction stir spot welding of thin AA 7075-T6 sheets Materialwiss. Werkstofftech. 2020, 51, 830-835

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Microstructure and failure mechanisms of refill friction stir spot welded 7075-T6 aluminum alloy joints

Cited by 199 publications

References 17 publications

Experimental investigation of the weldability of high strength aluminium using friction spot welding

Experimental investigation of the weldability of high strength aluminium using friction spot welding

The Plastic Deformation of RFSSW Joints During Tensile Tests / Deformacja Plastyczna Wybranych Połączeń RFSSW Podczas Rozciągania

Mechanical performance optimization of similar thin AA 7075‐T6 sheets produced by refill friction stir spot welding

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