Study of the fatigue behaviour of dissimilar aluminium joints produced by friction stir welding

Infante, V.; Braga, Daniel F.O.; Duarte, F.F.; Moreira, P.M.G.P.; Freitas, M.; Castro, P.M.S.T. de

doi:10.1016/j.ijfatigue.2015.06.020

Cited by 64 publications

(27 citation statements)

References 17 publications

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“…The hook-like defects (Figure 11) similar to the JLR seriously affected the material fatigue properties [81]. The fatigue strength of the FSW lap joint was less than 5.6% of the tensile strength of base metal [82]. Joint Line Remnant (JLR) is a flaw in the nugget region which is caused by the natural oxide layer on the workpiece surfaces before welding [76,79], as shown in Figure 10.…”

Section: Weld Defectsmentioning

confidence: 99%

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Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Gao

2018

Applied Sciences

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The application fields of friction stir welding technology, such as aerospace and transportation, has high safety requirements and fatigue is the dominant failure mode for weldments. It is of great significance to understand the fatigue properties of friction stir welded joints. This paper provides an overview of the fatigue mechanism, influencing factors, crack growth rate, and fatigue life assessment. It is found that the fatigue performance of friction stir welded joints can be affected by welding process parameters, test environment, stress ratio, residual stress, and weld defect. The optimized process parameters can produce high quality weld and increase the weld fatigue life. Laser peening is an effective post weld treatment to decrease fatigue crack growth rate and improve material fatigue life.

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Section: Weld Defectsmentioning

confidence: 99%

“…The hook-like defects (Figure 11) similar to the JLR seriously affected the material fatigue properties [81]. The fatigue strength of the FSW lap joint was less than 5.6% of the tensile strength of base metal [82]. reduced due to inadequate pressure between the rear side of the tool and workpiece material.…”

Section: Weld Defectsmentioning

confidence: 99%

Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Gao

2018

Applied Sciences

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“…In case of FSW, flat dog-bone shape samples are being used. Tensile, bending and fatigue performance of the FSW material are subjected to different loading conditions and the resulting data are used to understand the mechanical behavior of the joints [75][76][77]. Metallographic examinations can also reveal details of microstructure and some types of defects in FSW material such as lack of penetration and kissing bonds [64].…”

Section: Destructive Testing and Evaluation Methodsmentioning

confidence: 99%

Investigation of Nondestructive Testing Methods for Friction Stir Welding

Taheri

Kilpatrick

Norvalls

et al. 2019

Metals

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Friction stir welding is a method of materials processing that enables the joining of similar and dissimilar materials. The process, as originally designed by The Welding Institute (TWI), provides a unique approach to manufacturing—where materials can be joined in many designs and still retain mechanical properties that are similar to, or greater than, other forms of welding. This process is not free of defects that can alter, limit, and occasionally render the resulting weld unusable. Most common amongst these defects are kissing bonds, wormholes and cracks that are often hidden from visual inspection. To identify these defects, various nondestructive testing methods are being used. This paper presents background to the process of friction stir welding and identifies major process parameters that affect the weld properties, the origin, and types of defects that can occur, and potential nondestructive methods for ex-situ detection and in-situ identification of these potential defects, which can then allow for corrective action to be taken.

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“…All joints tensile tests were made at 1 mm/min crosshead speed. Remote stress was calculated for all joints, by dividing the axial load by the substrate cross section outside of the overlap as in previous works . Joint efficiency was calculated by dividing the maximum remote stress with the base material ultimate tensile strength.…”

Section: Methodsmentioning

confidence: 99%

Fatigue performance of hybrid overlap friction stir welding and adhesive bonding of an Al‐Mg‐Cu alloy

Braga

Maciel

Bergmann

et al. 2018

Fatigue Fract Eng Mat Struct

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The need for weight reduction and leaner manufacturing and assembly processes in aircraft construction has led to the pursuit of welding technologies. One such technology that has been considered for this application is friction stir welding (FSW). Since it is a solid‐state joining method, it creates high performing joints in a wide range of materials while avoiding overlap lengths and added weight from fasteners, crack stoppers, doublers, etc. However, the adoption of this technology to the assembly of large fuselage shell components is challenging, due to geometric tolerance management requirements. In this paper, a hybrid joining method is proposed for such application, involving FSW and adhesive bonding. Fatigue performance of single lap joints of AA2024‐T3 Al‐Mg‐Cu alloy was assessed and benchmarked against FSW overlap and adhesive bonded joints. Significant strength and ductility increase was achieved through the hybridization of the overlap FSW joints. Fatigue strength of the hybrid joints was also higher than FSW overlap joints, although not as high as adhesive bonded joints.

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Study of the fatigue behaviour of dissimilar aluminium joints produced by friction stir welding

Cited by 64 publications

References 17 publications

Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Investigation of Nondestructive Testing Methods for Friction Stir Welding

Fatigue performance of hybrid overlap friction stir welding and adhesive bonding of an Al‐Mg‐Cu alloy

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