Flow patterns in friction stir welds of AA5083 and AA6082 alloys

Donatus, Uyime; Thompson, G.E.; Zhou, Xiaorong; Wang, Junjie; Beamish, Kathryn

doi:10.1016/j.matdes.2015.06.006

Cited by 60 publications

(18 citation statements)

References 26 publications

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“…The material flow pattern and the corrosion susceptible regions in the friction stir welds of these two alloys have been thoroughly investigated previously. 4,28 The investigation in this study is based on the different electrochemical responses of the weld zones. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The zones are the parent metals (PM) of both alloys (PM-5083 and PM-6082); the heat affected zones (HAZs) of both alloys; the thermomechanically affected zone of the AA5083-O alloy outside the tool domain (AS-TMAZ); the thermomechanically affected zone of the AA5083-O alloy in the tool domain (MID-TMAZ); the thermomechanically affected zone of the AA6082-T6 alloy in the tool domain (RS-TMAZ); and the stir zone (SZ) of the friction stir weld. 28 Anodizing the bare weld. -Fig.…”

Section: Resultsmentioning

confidence: 99%

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Anodizing Behavior of Friction Stir Welded Dissimilar Aluminum Alloys

Donatus

Thompson

Zhou

2015

J. Electrochem. Soc.

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The anodizing behavior of a dissimilar friction stir weld of AA5083-O and AA6082-T6 alloys in 4 M H 2 SO 4 solution has been investigated. The anodizing results show that the AA5083-O rich zones were more oxidized during anodizing compared with the AA6082-T6 rich zones. Interestingly, the nugget and the thermomechanically affected regions of the individual parent alloys showed significant reduction in porous anodic oxide thicknesses. Sputtering-deposition of pure aluminum on the weld, prior to anodizing, significantly minimized the variations in the oxide thicknesses across the weld. More importantly, this method prevented the boundary dissolution (associated with the activity of the Mg 2 Si phase) that is often observed after anodizing the dissimilar weld of the alloys. © The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. [DOI: 10.1149/2.0651512jes] All rights reserved. Friction stir welding is a solid state joining process that employs the frictional heat generated as a result of the motion between a nonconsumable rotating tool and the work pieces to produce welds. In the last two decades, since its invention in 1991, friction stir welding has become a highly reliable joining technique based on its principal advantage of being able to produce welds in the solid state with low heat spread. [1][2][3] In the transport industry, lightweighting is highly desired as well as multi-functionality of components which can be readily achieved by using multi-material components. Friction stir welding can produce multi-material component welds with minimal defects compared with fusion welding techniques. However, a common feature of all welding process is that zonal heterogeneities are often generated with consequent galvanic cells in the welds, which will be particularly pronounced in welds of dissimilar materials. 4 These galvanic cells can lead to undesirable corrosion failures in service. In a bid to reduce corrosion susceptibilities in friction stir welds, post weld heattreatment/artificial aging, 3,5-7 laser surface melting, [8][9][10][11][12] cold sprayed aluminum 13 and micro-arc oxidation coating 14 have been employed in recent times. Whilst post weld heat-treatment has been reported to improve the corrosion resistance of certain friction stir welded aluminum alloys 3,7 and to improve the mechanical properties of the low-strength weld regions ,15 its suitability for in-service applications is in doubt because of the timing involved and the large structure sizes employed commercially.7 Laser surface melting has been reported to improve the corrosion resistance of friction stir welded aluminum alloys throu...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Anodizing Behavior of Friction Stir Welded Dissimilar Aluminum Alloys

Donatus

Thompson

Zhou

2015

J. Electrochem. Soc.

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“…It is also important to state that in many friction stir welds, boundaries between the materials from the advancing side and the materials from the retreating side, where mixtures do not occur, often exist [6,[17][18][19]. Reports from microstructural examinations reveal the formation of intermetallic particles along these boundaries when dissimilar alloys are involved [5].…”

Section: /3mentioning

confidence: 99%

Corrosion Behaviour of Friction Stir Welded Aluminium Alloys: Unpredictability and Protection

Donatus¹

2017

RDMS

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The corrosion susceptible regions in friction stir weldments of aluminium alloys are largely unpredictable. Several factors dictate the undesirable susceptibility of an Al alloy friction stir weldment. A change in temper or processing parameters can significantly alter the corrosion behaviour of an Al alloy weldment. Pronounced zonal heterogeneities induced by the welding process causes increased corrosion rate of the susceptible region due to galvanic coupling with the more noble regions. To prevent this, different protection methods and techniques have been employed and are currently being developed. Laser surface melting, post-weld heat treatment, micro-arc oxidation, application of corrosion resistant material, conventional anodizing, and pre-sputter deposition prior to anodizing have all been shown to improve the corrosion resistance of friction stir weldments of different Al alloys.

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“…Donatus et al [5] focused on identifying corrosion-susceptible regions of dissimilar friction stir welds of EN AW5083-O and EN AW6082-T6. Donatus et al [6] performed dissimilar FSW studies on EN AW5083-O and EN AW6082-T6 to investigate the material flow in the friction stir welds. Steuwer et al [7] investigated the effect of the welding parameters on the residual stress profiles on the same welds.…”

Section: Introductionmentioning

confidence: 99%

A Case Study for the Welding of Dissimilar EN AW 6082 and EN AW 5083 Aluminum Alloys by Friction Stir Welding

Kasman

Kahraman

Emiralioğlu

et al. 2016

Metals

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Abstract:The aim of this study is to investigate the effect of keeping constant the tool rotational speed to the welding speed ratio (υ ratio) on the mechanical properties of the dissimilar friction stir welding of EN AW6082-T6 and EN AW5083-H111. Two different pins shaped as triangular and pentagonal were associated with the constant υ ratio. From the tensile test results, it was found that the υ ratio does not create an evident change in the weld joint strength. The small cavity-and tunnel-type defects were observed at the nugget zone and located on the advancing side of the pin. These defects caused a decrease in the strength and elongation of the weld joint. The most important inference obtained from the experimental results is that if the υ ratio is kept constant, the weld joint strength for each weld does not correspond to a constant value.

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Flow patterns in friction stir welds of AA5083 and AA6082 alloys

Cited by 60 publications

References 26 publications

Anodizing Behavior of Friction Stir Welded Dissimilar Aluminum Alloys

Anodizing Behavior of Friction Stir Welded Dissimilar Aluminum Alloys

Corrosion Behaviour of Friction Stir Welded Aluminium Alloys: Unpredictability and Protection

A Case Study for the Welding of Dissimilar EN AW 6082 and EN AW 5083 Aluminum Alloys by Friction Stir Welding

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