Effect of shoulder geometry on residual stress and fatigue properties of AA6082 fsw joints

Giorgi, M. De; Scialpi, A.; Panella, F.W.; Filippis, Luigi Alberto Ciro De

doi:10.1007/s12206-008-1006-4

Cited by 52 publications

(25 citation statements)

References 25 publications

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“…5, the lowest torque values are registered in welds carried out with the flat shoulder tool, for all welding parameters, which suggest that it is this tool that generates most heat, producing the maximum shear stress reduction of the material under the tool. These results are in good agreement with those of De Giorgi et al (2009), referred to above. However, a contradiction in the present study can be found by comparing torque results and the morphology of the welds, i.e., if the flat shoulder generates more heat, it should not lead to defects, contrary to what was observed in all welds produced with this tool.…”

Section: Discussionsupporting

confidence: 93%

Influence of tool shoulder geometry on properties of friction stir welds in thin copper sheets

Galvão

Leal

Rodrigues

et al. 2013

Journal of Materials Processing Technology

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a b s t r a c tThe aim of this work is to study the influence of the shoulder geometry on friction stir welding of 1 mmthick copper-DHP plates. The welds were produced using three different shoulder geometries, flat, conical and scrolled, and varying the rotation and traverse speeds of the tool. The flat shoulder tool proved to be inadequate for performing welds, because many defects were produced for all welding conditions. In turn, the scrolled shoulder tool is more effective than the conical one in the production of defect free welds. However, both geometries required a minimum rotational speed to avoid internal defects. For the same welding parameters, greater grain refinement, higher hardness and improved strength are also achieved in the nugget of the welds, using the scrolled tool.

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Section: Discussionsupporting

confidence: 93%

Influence of tool shoulder geometry on properties of friction stir welds in thin copper sheets

Galvão

Leal

Rodrigues

et al. 2013

Journal of Materials Processing Technology

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“…Heat is generated between the tool and material which leads to a very soft region near the FSW tool. The forging forces caused by the rotating tool deform the material plastically and correspondingly result in the "stirring" of the material in the nugget and joining of the workpieces [2]. This process induces large shear forces in the plastically deformed material, and subsequently raises the temperature of the material to approximately 0.6-0.7 T m (T m is the melting point of material).…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of friction stir welding process and investigation into affective parameters using simulation

2015

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Friction stir welding (FSW) as an efficient solid state joining process has numerous applications in industries. Temperature distribution analysis through simulation not only brings the possibility to characterize the microstructure of different zones, but also enables one to save cost and energy as optimum welding variables are obtained with less concern. In the present study, the temperature distribution during the friction stir welding (FSW) process of AA6061-T6 was evaluated using finite element method (FEM). Since experimental measurements cannot be readily made in the weld region, it is difcult to understand physics in the stir zone of the welds without simulation. Abaqus software was applied to model the parts and simulate the process of welding, while Johnson-Cook law utilized to evaluate the effect of strain rate and generated heat. FE-results were verified by experimental results. The comparisons revealed a good compatibility between the results. The effect of probe shape on temperature distribution was also studied. It was found that spherical pins result in the highest temperatures at workpieces with respect to cylindrical and tapered pins. Additionally, it was concluded that more heat is generated in workpieces as pin angle increases.

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“…In particular, a systematic bibliographical investigation was carried out to collect fatigue results generated by testing specimens made of 6056-T4, 6061-T6, 6082, 6082-T6 and 6082-T4. These specimens had been manufactured using different combinations of the key welding process parameters [18][19][20][21][22][23][24][25][26][27][28][29][30][31]. The thickness of the FS plate in these data ranged from 0.8-7 mm and the fatigue testing used load ratios of -1, 0, 0.1, 0.2, and 0.5.…”

Section: Fatigue Behaviour Under Pure Axial and Pure Torsional Cyclicmentioning

confidence: 99%

Multiaxial fatigue assessment of friction stir welded tubular joints of Al 6082-T6

Susmel

Hattingh

James

et al. 2017

International Journal of Fatigue

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ReuseThis article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) licence. This licence only allows you to download this work and share it with others as long as you credit the authors, but you can't change the article in any way or use it commercially. More information and the full terms of the licence here: https://creativecommons.org/licenses/ AbstractThe present paper addresses the problem of designing aluminium friction stir (FS) welded joints against multiaxial fatigue. After developing a bespoke FS welding technology suitable for joining aluminium tubes, some one hundred welded tubular specimens of Al 6082-T6 were tested under pure axial, pure torsional and biaxial tension-torsion loading.The influence was explored of two independent variables, namely the proportional or nonproportional nature of the biaxial loading and the effect of axial and torsional non-zero mean stresses. The experimental results were re-analysed using the Modified Wöhler Curve Method (MWCM), with this bi-parametrical critical plane approach being applied in terms of nominal stresses, notch stresses, and also the Point Method. The validation exercise carried out using these experimental data demonstrated that the MWCM is applicable to prediction of the fatigue lives for these FS welded joints, with its use resulting in life estimates that fall within the uniaxial and torsional calibration scatter bands. The approach proposed in the present paper offers, for the first time, a complete solution to the problem of designing tubular FS welded joints against multiaxial fatigue loading.

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Effect of shoulder geometry on residual stress and fatigue properties of AA6082 fsw joints

Cited by 52 publications

References 25 publications

Influence of tool shoulder geometry on properties of friction stir welds in thin copper sheets

Influence of tool shoulder geometry on properties of friction stir welds in thin copper sheets

Thermal analysis of friction stir welding process and investigation into affective parameters using simulation

Multiaxial fatigue assessment of friction stir welded tubular joints of Al 6082-T6

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