Microstructures and mechanical properties of friction spot welded Alclad 7B04-T74 aluminium alloy

Zhao, Yunqiang; Liu, H. J.; Lin, Zhicheng; Chen, S. X.; Hou, Jian

doi:10.1179/1362171814y.0000000235

Cited by 34 publications

(12 citation statements)

References 19 publications

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“…According to the previous studies on FSpW of 7B04-T74 aluminum alloy by the present authors, the optimal welding parameters were tool rotation speed of 1500 rpm, sleeve motion speed of 1 mm/s, and sleeve plunge depth of 3 mm. In addition, a surface indentation with 0.15 mm depth was applied, which had been proved to be necessary for a good weld formation by the present authors [2,3]. Therefore, such welding parameters mentioned above were chosen as the welding parameters applied in this study.…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…Friction spot welding (FSpW) is a new solid state joining technique, which is derived from the conventional friction stir welding (FSW) process [1,2]. Comparing with the conventional friction stir spot welding (FSSW), there is no keyhole left in the FSpW joint, so higher mechanical properties can be obtained and the corrosion near the bottom of the keyhole can be avoided [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Study of temperature and material flow during friction spot welding of 7B04-T74 aluminum alloy

Zhao

Liu

Yang

et al. 2015

Int J Adv Manuf Technol

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Temperature and material flow behavior during friction spot welding of Alclad 7B04-T74 aluminum alloy were studied by both numerical simulation and welding experiment. The Alclad 7B04-T74 aluminum alloy sequentially experienced solid solution treatment at 465°C, low temperature artificial aging at 120°C, and high temperature artificial aging at 180°C. During welding, the material which flowed into the sleeve cavity suffered from higher temperature, and the peak temperature in the stir zone was higher than the incipient melting temperature of the base material. Accordingly, the eutectic films along the grain boundaries can be observed in the stir zone after welding. The peak temperatures in the thermo-mechanically affected zone and the heat affected zone were lower than the solution temperature and higher than the artificial aging temperature of the base material. In the sleeve retreating stage of the welding process, the material in the sleeve cavity flowed downward out of the sleeve cavity, and then it flowed laterally and upward to fill the gap left by the retreating sleeve. Such a material flow path resulted in the "U-shaped" morphology of the bonding ligament, the upward curving of the hook, and the upward distortion of the grains in the thermomechanically affected zone.

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Section: Materials and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of temperature and material flow during friction spot welding of 7B04-T74 aluminum alloy

Zhao

Liu

Yang

et al. 2015

Int J Adv Manuf Technol

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“…Since its invention, refill FSSW has been used for joining similar metals or materials [6][7][8][9][10] as well as joining dissimilar materials. [11][12][13][14] HZG proved that refill FSSW creates joints with superior mechanical properties to similar processes.…”

mentioning

confidence: 99%

Texture Development and Material Flow Behavior During Refill Friction Stir Spot Welding of AlMgSc

Shen¹,

Lage

Suhuddin³

et al. 2017

Metall Mater Trans A

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The microstructural evolution during refill friction stir spot welding of an AlMgSc alloy was studied. The primary texture that developed in all regions, with the exception of the weld center, was determined to be h110i fibers and interpreted as a simple shear texture with the h110i direction aligned with the shear direction. The material flow is mainly driven by two components: the simple shear acting on the horizontal plane causing an inward-directed spiral flow and the extrusion acting on the vertical plane causing an upward-directed or downward-directed flow. Under such a complex material flow, the weld center, which is subjected to minimal local strain, is the least recrystallized. In addition to the geometric effects of strain and grain subdivision, thermally activated high-angle grain boundary migration, particularly continuous dynamic recrystallization, drives the formation of refined grains in the stirred zone.

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“…The employed tool rotation speed, sleeve motion speed, and sleeve plunge depth were 1500 rpm, 1 mm/s, and 3 mm respectively. This set of parameters had been proved to be optimized by the present authors [10]. Previous study conducted by the present authors indicated that a part of plastic material would overflow out from the welding region in the RFSSW process, the left material was not enough to refill the welding spot.…”

Section: Materials and Experimentsmentioning

confidence: 74%

“…Only a few relative studies have been conducted. Zhao et al [10] studied the microstructures of RFSSW joints of 7B04-T74 aluminum alloy at different tool rotation speeds. They found that the grains in the outer stir zone were equiaxed, and the grains in the inner stir zone were elongated and coarsened.…”

Section: Introductionmentioning

confidence: 99%

Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy

Zhao¹,

Dong²,

Wang³

et al. 2020

Metals

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In this study, Al-Zn-Mg-Cu alloy was refill friction spot welded, and the precipitates, dislocation, recovery, and recrystallization characteristics were focused. In the stir zone (SZ), continues dynamic recrystallization occurs under the intense plastic deformation. All the original GP (II) zones and η' precipitates dissolved into the aluminum matrix under the welding heat input, and the stable η and E precipitates remained. In the thermo-mechanically affected zone (TMAZ), high-density dislocations and subgrains boundaries can be observed. The continued dynamic recrystallization was not activated and only dynamic recovery occurs. Sub-boundaries and high-density dislocations in this zone can be observed. In this zone, the η precipitates are coarsened and dissolution is the main evolution mechanism for the GP (II) zones and η' precipitates. In the heat-affected zone (HAZ), no dislocation was induced and all the initial precipitates were coarsened under the welding heat input. The HAZ, the TMAZ, and the SZ constitute a soft region in the refill friction stir spot welding (RFSSW) joint, and the minimum value located at the interface between the HAZ and the TMAZ.

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Microstructures and mechanical properties of friction spot welded Alclad 7B04-T74 aluminium alloy

Cited by 34 publications

References 19 publications

Study of temperature and material flow during friction spot welding of 7B04-T74 aluminum alloy

Study of temperature and material flow during friction spot welding of 7B04-T74 aluminum alloy

Texture Development and Material Flow Behavior During Refill Friction Stir Spot Welding of AlMgSc

Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy

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