Fatigue properties of friction stir overlap welds

Ericsson, Madelene; Jin, Lai-Zhe; Sandström, Rolf

doi:10.1016/j.ijfatigue.2006.02.052

Cited by 105 publications

(64 citation statements)

References 2 publications

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“…As such, the thinner aluminum sheet, further thinned by the cold lap-shear feature, experienced higher bending stresses that favor crack initiation into the aluminum sheet compared to the magnesium sheet or the weld nugget. Observations made in this current study regarding the failure of the top sheet on the RS of the weld due to sheet thinning was also observed in fatigue lap-shear testing of FSLW of similar aluminum alloys [38,39]. In addition, a recent work by Neik et al [40] on the fatigue of similar FSLW AZ31 Magnesium alloys showed that fracture under cyclic loading consistently occurred on the AS faying surface in a kinked crack mode and no other failure type was reported.…”

Section: Fatigue and Fracturesupporting

confidence: 73%

Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys

Rao

Jordon

Ghaffari

et al. 2016

International Journal of Fatigue

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A comprehensive study of fatigue life and damage mechanisms of friction stir linear welded dissimilar aluminum-to-magnesium alloys in lap-shear configuration is presented. The overlap linear welds were created by welding AA6022 aluminum alloy to AM60B magnesium alloy. The test results showed significant scatter in the fatigue life and the corresponding fracture modes. Two distinct modes of failure were observed for the lap-shear specimens. In one of the failure modes observed, fracture occurred when the dominant fatigue crack propagated into either the magnesium or aluminum sheet in a kink-crack formation. In addition, fretting debris was found at locations of crack initiation for this fracture mode. In the other observed mode of failure, fracture occurred by interfacial weld separation, where fractography analysis suggests that the fatigue cracks initiated at weld defects and then propagated through the brittle intermetallic phase formed during welding.2

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Section: Fatigue and Fracturesupporting

confidence: 73%

Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys

Rao

Jordon

Ghaffari

et al. 2016

International Journal of Fatigue

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“…In addition, friction stir welded joints are obtained through the deformation of the material at temperatures below the melting point, so reducing problems related to distortions and residual stresses (compared to traditional welding techniques). For all the above mentioned reasons, this technique has already been applied in several industrial fields [3,4].…”

Section: Introductionmentioning

confidence: 99%

The influence of process parameters and tool geometry on mechanical properties of friction stir welded aluminum lap joints

D’Urso

Giardini

2010

Int J Mater Form

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The results of an experimental investigation on the lap joining of AA6022-T4 aluminum alloy blanks by FSW are reported in the present paper; in particular, the joints strength was investigated. The experimental campaign was performed on sheets having a thickness of 1.2 mm, lap joined by means of a CNC machine tool. Several tests were carried out by varying process parameters (namely feed rate and rotational speed), joints configuration and tool geometry (two different tools were adopted for this purpose). The first tool was a very simple device with a flat shoulder and a cylindrical pin. The second one was a more complex tool, with a flat shoulder and a threaded probe. During these tests welding forces were also measured. A universal testing machine was employed to evaluate the strength of the friction stir welded joints as a function of the different process conditions. Interesting results in terms of tensile strength of the joints were obtained using both the simple and the threaded tools. In particular it was found that the use of threaded pin tools and the correct choice of the relative sheet positioning may lead to the improvement of the mechanical properties of the obtained joints. Moreover, the use of the threaded tool showed a certain reduction in welding forces, with respect to the simple tool.

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“…A quite brittle structure formed in the weld zone in welding of Mg alloys [11]. This is because the Mg alloy has a hexagonal closest-packed (HSP) lattice system and a cross-shifting is observed in these materials.…”

Section: Tablo 3 Fsw Parameters and Results Of Tensile Testmentioning

confidence: 99%

Investigation of Effects of Different Parameters on Mechanical Properties in Friction Stir Welding of Az31b Magnesium Alloy

Çay¹,

Katı²,

Ozan³

et al. 2017

EJT

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Fatigue properties of friction stir overlap welds

Cited by 105 publications

References 2 publications

Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys

Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys

The influence of process parameters and tool geometry on mechanical properties of friction stir welded aluminum lap joints

Investigation of Effects of Different Parameters on Mechanical Properties in Friction Stir Welding of Az31b Magnesium Alloy

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