A study of the parameters influencing mechanical properties and the fatigue performance of refill friction stir spot welded AlMgSc alloy

Lage, Sara Beatriz Miranda; Campanelli, Leonardo Contri; Guerra, Ana Paula de Bribean; Shen, Junjun; Santos, Jorge F. dos; Silva, Paulo Sergio Carvalho Pereira da; Bolfarini, Claudemiro

doi:10.1007/s00170-018-2696-0

Cited by 12 publications

(12 citation statements)

References 14 publications

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“…The presence of no visible striations on some regions of the fracture surfaces suggests that unstable fatigue crack growth occurs in these regions during the cyclic lateral loading. This agrees with the findings of Lage et al [44]. The formed crack striations or concentric marks on Figs.…”

Section: Fractographysupporting

confidence: 93%

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Cyclic lateral behavior of friction stir spot welds of AA2219 aluminum alloy: impact of inherent flow defects

Ojo¹,

Taban²,

Kaluç³

et al. 2021

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Structural damage and fatigue life of engineering materials are controlled by inherent defects and the nature, level, and location of applied external loads. This paper studies the effect of cyclic lateral loads on the pinless and conical-pin assisted friction stir spot welds of AA2219 alloy. The results reveal the presence of upward-flow induced hook defect and outstretchingflow induced microscopic toe-notch in the conical pin and pinless welds, respectively. Extruded flash root contributed to the fracture pattern of the conical pin welds while it did not influence the fracture of the pinless weld. Grain refinement, microhardness, and microscopic toe-notch affect the fracture mode of pinless weld whereas complex fracture morphology ensues in conical pin weld. A decrease in the cyclic lateral stress level improves the lateral fatigue lives of both weld categories. Lateral fatigue improvement of welds requires the minimization of inherent nugget defects and extruded flash.

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Section: Fractographysupporting

confidence: 93%

“…14a,b. The extension of the welded region was more sensitive to shearing rather than the hook morphology in the works of Lage et al [44] owing to the reduced tool penetration depth in the pin assisted welds. The hook tip produced two forms of crack growth (P 1 and P 2, as indicated in Fig.…”

Section: Fractographymentioning

confidence: 99%

Cyclic lateral behavior of friction stir spot welds of AA2219 aluminum alloy: impact of inherent flow defects

Ojo¹,

Taban²,

Kaluç³

et al. 2021

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show abstract

“…Figure 2 shows the microstructure in cross section of 2024 aluminum alloy joint, which is similar to that of 6061 and AlMgSc aluminum alloys and AZ31 magnesium alloy. Based on grain structure, the welded area is characterized as two zones: stir zone (SZ) and thermomechanically affected zone (TMAZ), which is similar to FSW welded area [7][8][9][10]. The TMAZ is often characterized by grains Available online at http://link.sprin ger.com/journ al/40195 .…”

Section: Typical Cross-sectional Microstructure Of Jointsmentioning

confidence: 99%

“…With the restriction of the tool penetration into only the upper sheet, the hooking was minimized. And unstable fatigue crack growth did not take place [9].…”

Section: Fatigue Performance Of Similar Alloy Jointsmentioning

confidence: 99%

Refill Friction Stir Spot Welding of Similar and Dissimilar Alloys: A Review

Feng

Tang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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Refill friction stir spot welding, also known as friction spot welding (FSpW), is a solid-state welding process suitable for spot joining of lightweight materials. Through the efforts of improving joint quality for similar and dissimilar materials, for example, aluminum and magnesium, this joining technology is well developed. The joining mechanism and process characteristics of FSpW have been widely studied. However, the application of FSpW in industry has not been entirely successful. In this review article, the research of similar and dissimilar material joints, such as, Al/Cu, Al/Ti, Al/Mg and Al/ Steel, is summarized. The microstructural features and mechanical properties of the joints, welding tool and the application development are discussed in detail.

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“…The mechanism of fatigue crack initiation 2,3 and the characteristics of crack propagation 4,5 were explained from the microscopic perspective, and the influencing factors of fatigue behavior were analyzed. 6 In addition, more studies have been conducted on the prediction of fatigue life. [7][8][9][10] Most of these results are fatigue behaviors for a single similar fatigue hazardous detail part, which is not enough to indicate the damage failure of a structure.…”

Section: Introductionmentioning

confidence: 99%

Investigation on fatigue damage equivalence probability for the structure with similar fatigue hazardous detail parts

Qin

Dui³

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Fatigue damage of a whole structure with multiple similar fatigue hazardous detail parts is unclear. This paper focuses on the concept of quantified fatigue damage for the structure with similar fatigue hazardous detail parts by using the probability method and fatigue failure probability of the severe load spectrum. The probability criterion and calculation method of equivalent damage with different load spectra were proposed. The fatigue life probability distribution of the severe load spectrum was analyzed, and the acceleration ratio was defined by the similar details number of fatigue cracking in combination with the fatigue failure probability characteristics of the severe load spectrum. The results show that there is good agreement between the similar details number range of fatigue cracking in two load spectra, which means they are considered to be equivalent. The ratio of the sum of two similar details number ranges is used as acceleration ratio to evaluate the severe load spectrum. The application of this study in the statistical sense of engineering structure fatigue failure is more convincing.

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A study of the parameters influencing mechanical properties and the fatigue performance of refill friction stir spot welded AlMgSc alloy

Cited by 12 publications

References 14 publications

Cyclic lateral behavior of friction stir spot welds of AA2219 aluminum alloy: impact of inherent flow defects

Cyclic lateral behavior of friction stir spot welds of AA2219 aluminum alloy: impact of inherent flow defects

Refill Friction Stir Spot Welding of Similar and Dissimilar Alloys: A Review

Investigation on fatigue damage equivalence probability for the structure with similar fatigue hazardous detail parts

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