Microstructure and mechanical properties of friction spot welded 6061-T4 aluminum alloy

Shen, Zhikang; Yang, Xu; Yang, Shuo; Zhang, Zhaohua; Yin, Yuhuan

doi:10.1016/j.matdes.2013.08.021

Cited by 110 publications

(70 citation statements)

References 24 publications

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“…The previous studies of the FSpW were mainly focused on optimizing welding parameters, and macrostructure and microstructure characteristics of the joint [11][12][13][14][15][16]. Tier et al [11] reported that the most important welding parameter for the FSpW of 5042-O aluminum alloy was the plunge depth, followed by the tool rotational speed.…”

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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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: 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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“…1 was reduced more significantly due to a high heat input during the welding process. As described in the literature [25], coarse grains especially in the thickness direction were induced in the HAZ due to the weld thermal cycle. Thus, the coarse grains in HAZ under high heat input condition could be one of the reasons which resulted in the decrease of hardness in HAZ.…”

Section: Effect Of Heat Input On the Microhardness And Microstructurementioning

confidence: 54%

Effects of Porosity, Heat Input and Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of TIG Welded Joints of AA6082-T6

Wang

Xue

et al. 2017

Metals

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Abstract:Various heat input conditions and post-weld heat treatments were adopted to investigate the microstructure evolution and mechanical properties of tungsten inert gas (TIG) welded joints of AA6082-T6 with porosity defects. The results show that the fracture location is uncertain when an as-welded joint has porosities in the weld zone (WZ), and overaging in the heat-affected zone (HAZ) at the same time. When the fracture of the as-welded joint occurs in the HAZ, the total heat input has a linear relation with the tensile strength of the joint. An excess heat input induces the overgrowth of Mg 2 Si precipitates in HAZ and the coarsening of α-Al grains in WZ, resulting in a decrease in the microhardness of the corresponding areas. After artificial aging treatment, the tensile strength of the welded joint is increased by approximately 9-13% as compared to that of as-welded joint, and fracture also occurs in HAZ. In contrast, for solution treated and artificial aging treated joint, fracture occurs suddenly at the rising phase of the tensile curve due to porosity defects throughout the weld metal. Furthermore, the eutectic Si particles of WZ coarsen and spheroidize after solution treatment and artificial aging treatment, due to the diffusion of Si to the surface of the original Si phases when soaking at high temperature.

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“…In the paper [10] the load-capacity and microstructure of the RFSSW joints made of aluminium alloy 6061-T4 were presented. Also the characteristics of the hooks and voids made at different processing parameters were discussed.…”

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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Microstructure and mechanical properties of friction spot welded 6061-T4 aluminum alloy

Cited by 110 publications

References 24 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

Effects of Porosity, Heat Input and Post-Weld Heat Treatment on the Microstructure and Mechanical Properties of TIG Welded Joints of AA6082-T6

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

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