Microstructures and Failure Mechanisms of Spot Friction Welds in Lap-Shear Specimens of Aluminum 6111-T4 Sheets

Lin, P.-C.; Lin, Shiyao; Pan, Jwo; Pan, Tsung-Yu; Nicholson, John M.; Garman, M. A.

doi:10.4271/2004-01-1330

Cited by 54 publications

(39 citation statements)

References 4 publications

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“…Tool geometry such as probe length, probe shape and shoulder size is also a key parameter, because it would affect the heat generation and the plastic material flow. A few studies on the effect of tool geometry have been reported on FSW [7,8], but there have been very limited studies on FSSW [4].…”

Section: Introductionmentioning

confidence: 98%

“…However, since FSSW is a rather newly developed technology, the optimum welding condition has not yet been established. There are many processing parameters in the FSSW process, thus a systematic study has to be done in order to understand the effect of individual parameter on the microstructure and mechanical properties of welds [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of tool geometry on microstructure and static strength in friction stir spot welded aluminium alloys

Tozaki

Uematsu

Tokaji

2007

International Journal of Machine Tools and Manufacture

166

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Effect of tool geometry on microstructure and static strength in friction stir spot welded aluminium alloys

Tozaki

Uematsu

Tokaji

2007

International Journal of Machine Tools and Manufacture

166

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“…[8] The tool penetration process and the factors determining weld mechanical properties have been investigated during spot welding of Al-alloy and Mgalloy sheet materials. [9][10][11][12] Although the microstructural features and mechanical properties of Al 5754 and Al 6061 friction stir seam welds have been studied extensively, [13][14][15][16][17][18][19][20][21] this is not the case in Al 5754 and Al 6061 friction stir spots welds made using a range of tool rotational speed settings.…”

Section: Introductionmentioning

confidence: 99%

Strain Rates and Grain Growth in Al 5754 and Al 6061 Friction Stir Spot Welds

Gerlich¹,

Yamamoto²,

North³

2007

Metall Mater Trans A

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The stir zone temperature and microstructures are compared in friction stir spot welds produced in Al 5754 and Al 6061 alloys. Electron backscattered diffraction was used to determine the relationship between tool rotation speed during welding and final stir zone grain size. Comparison of the grain sizes in rapidly quenched welds with those in air-cooled joints confirmed that grain growth occurred only in Al 6061 spot welds. There was no evidence of abnormal grain growth in the stir zones of Al 6061 welds; the final grain size could be represented using an Arrhenius equation. The strain rates during welding were determined by incorporating the stir zone temperature and average subgrain sizes in quenched spot welds in the Zener-Hollomon relation. When the tool rotation speed increased from 750 to 3000 RPM, the strain rate values ranged from 180 to 497 s -1 in Al 5754 spot welds and from 55 to 395 s -1 in Al 6061 spot welds. It is suggested that a no-slip boundary condition may be appropriate during numerical modeling of Al 5754 and 6061 friction stir spot welding. This is not the case during Al 7075, Al 2024, and Mg-alloy AZ91 spot welding because spontaneous melting facilitates slippage at the tool contact interface.

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“…For example, Lin et al [9,10] studied the microstructures and failure modes of spot friction welds in lap-shear specimens of aluminum 6111-T4 sheets using optical micrographs. Pan et al [11] and Fujimoto et al [12,13] examined the failure modes of spot friction welds in lap-shear specimens based on micrographs and microhardness distributions, and the results indicate that failure loads and failure modes depend on the tool indentation depth.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life prediction of friction stir spot welds based on cyclic strain range with hardness distribution and finite element analysis

2012

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The main aim of the present study is to investigate the fatigue behavior of single friction stir spot welds (FSSW) using strain-based modified Morrow's damage equation. The correlation between microhardness, cyclic material constants, and mechanical strength of different zones around the FSSW are assumed to be proportional to the base material hardness. Experimental fatigue tests of friction stir spot welded specimens have been carried out using a constant amplitude load control servo-hydraulic fatigue testing machine. ANSYS finite element code has been used to simulate a single tensile shear friction stir spot welded joint, and non-linear elastic-plastic finite element analysis has been employed to obtain the values of local equivalent stress and strain near the notch roots of the joints. The results based on the numerical predictions have been compared with the experimental fatigue test data. It has been shown that the strain-based approach does a very good job for estimating the fatigue life of friction stir spot welded joints.

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Microstructures and Failure Mechanisms of Spot Friction Welds in Lap-Shear Specimens of Aluminum 6111-T4 Sheets

Cited by 54 publications

References 4 publications

Effect of tool geometry on microstructure and static strength in friction stir spot welded aluminium alloys

Effect of tool geometry on microstructure and static strength in friction stir spot welded aluminium alloys

Strain Rates and Grain Growth in Al 5754 and Al 6061 Friction Stir Spot Welds

Fatigue life prediction of friction stir spot welds based on cyclic strain range with hardness distribution and finite element analysis

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