Mechanical Properties and Microstructure of 6082-T6 Aluminum Alloy Joints by Self-support Friction Stir Welding

Wan, Long; Huang, Yu Dong; Guo, Wei; Lv, Shixiong; Feng, Jicai

doi:10.1016/j.jmst.2014.04.009

Cited by 80 publications

(26 citation statements)

References 28 publications

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“…There is a zone outside the nugget (transition between TMAZ and HAZ) which has the lower hardness value. In [9] and [20], it is suggested that the variation of the microhardness values in the welded area and parent material is due to the difference between the microstructures of the base alloy and weld zone. Pictures of the microstructure of the different areas of the 6082-T6 alloy aluminum can be found in [21].…”

Section: Hardness Profile and Microstructure Of The 6082-t6 Fsw Jointmentioning

confidence: 99%

“…Due to severely thermal and mechanical deformation in the weld zone during FSW, this zone generally possesses various microstructural features and various mechanical properties [8] and [9]. The crack propagation in the weld bead (FSW and classic) is known to be concerned by residual stress and/or hardness around the welded zone [10] and [11].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Mechanical Behavior and Fatigue in a Weld Bead by Friction Stir for a 6082-T6 Aluminum Alloy

Kambouz

Benguediab²,

Bouchouicha³

et al. 2017

Period. Polytech. Mech. Eng.

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Section: Hardness Profile and Microstructure Of The 6082-t6 Fsw Jointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Mechanical Behavior and Fatigue in a Weld Bead by Friction Stir for a 6082-T6 Aluminum Alloy

Kambouz

Benguediab²,

Bouchouicha³

et al. 2017

Period. Polytech. Mech. Eng.

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“…Plasticine as a physical analogue can demonstrate reliable flow visualization for the plasticized material during the process [48,50]. The similar formability behaviour of the plasticine to some metals makes it possible to be used for modelling of the shear flow patterns during the severe plastic deformation [29,30]. A plasticine model with multi-coloured layers can reveal the actual flow patterns during the FSW process without needing to prepare and etch metal sections [22][23][24].…”

Section: Discussionmentioning

confidence: 99%

“…For BFSW, as a recent alternative, most of the work is focused on the material performance [27,28] or attempting to explain the formation mechanism of the internal defects based on metallurgical observations [24,[27][28][29]. There have been attempts to model the CFSW process using numerical simulation, e.g., as a thermo-mechanical phenomenon [30,31], but these efforts have not yet yielded a consolidated theory for the development of defects.…”

Section: Literaturementioning

confidence: 99%

Formation Mechanisms for Entry and Exit Defects in Bobbin Friction Stir Welding

Tamadon

Pons

Sued

et al. 2018

Metals

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Bobbin friction stir welding (BFSW) is an innovative variant for the solid state welding process whereby a rotating symmetrical tool causes a fully penetrated bond. Despite the process development, there are still unknown variables in the characterization of the process parameters which can cause uncontrolled weld defects. The entry zone and the exit zone consist of two discontinuitydefects and removing them is one of the current challenges for improving the weld quality. In the present research, the characteristic features of the entry and exit defects in the weld structure and formation mechanism of them during the BFSW processing was investigated. Using stacked layers of multi-colour plasticine the material flow, analogous to metal flow, can be visualised. By using different colours as the path markers of the analogue model, the streamline flow can be easily delineated in the discontinuity defects compared with the metal welds. AA6082-T6 aluminium plates and multi-layered plasticine slabs were employed to replicate the entry-exit defects in the metal weld and analogue samples. The fixed-bobbin tool utilized for this research was optimized by adding a thread feature and tri-flat geometry to the pin and closed-end spiral scrolls on both shoulder surfaces. Samples were processed at different rotating and longitudinal speeds to show the degree of dependency on the welding parameters for the defects. The analogue models showed that the entry zone and the exit zone of the BFSW are affected by the inhomogeneity of the material flow regime which causes the ejection or disruption of the plastic flow in the gap between the bobbin shoulders. The trial aluminium welds showed that the elimination of entry-exit defects in the weld body is not completely possible but the size of the defects can be minimized by modification of the welding parameters. For the entry zone, the flow pattern evolution suggested formation mechanisms for a sprayed tail, island zone and discontinuity-channel. For the exit zone a keyhole-shaped discontinuity is discussed as a structural defect.

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“…Several studies have reported that in FSW of AZ31 Mg the tensile property, particularly tensile elongation and UTS are significantly reduced which was mainly attributed to the variations in grain size, texture and nugget shape. A few studies on fracture behavior reported that when loading is applied perpendicular to the joint direction, depending on the FSW conditions, the fracture may occur in the heat affected zone (HAZ) or TMAZ either on the advancing side (AS) or retreating side (RS) of the weld [29][30][31][32]. The fracture behavior was mainly explained on the basis of through the thickness and length deformation and microstructural inhomogeneity in weld zones.…”

Section: Introductionmentioning

confidence: 99%

Microstructural observations and tensile fracture behavior of FSW twin roll cast AZ31 Mg sheets

Dorbane

Ayoub

Mansoor

et al. 2016

Materials Science and Engineering: A

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Mechanical Properties and Microstructure of 6082-T6 Aluminum Alloy Joints by Self-support Friction Stir Welding

Cited by 80 publications

References 28 publications

Numerical Study of the Mechanical Behavior and Fatigue in a Weld Bead by Friction Stir for a 6082-T6 Aluminum Alloy

Numerical Study of the Mechanical Behavior and Fatigue in a Weld Bead by Friction Stir for a 6082-T6 Aluminum Alloy

Formation Mechanisms for Entry and Exit Defects in Bobbin Friction Stir Welding

Microstructural observations and tensile fracture behavior of FSW twin roll cast AZ31 Mg sheets

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