Microstructure and mechanical properties of dissimilar friction stir welds of AA2014 and AA7075

Kumar, Raj; Upadhyay, Vikas; Sharma, Chaitanya

doi:10.1177/09544089211058113

Cited by 6 publications

(2 citation statements)

References 38 publications

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“…The strength efficiency was 26-29% lower, whereas a 5-15% increase in elongation efficiency was recorded. Similar results were reported by Sharma et al 37 for dissimilar FSW welds of AA2024-AA7039, and Kumar et al 38,39 for AA2014 and AA7075 where weld tensile strength was lower than weak metal and attributed same to more contribution of low strength metal in weld region owing to complex material flow. 40,41 WFC welded joints display higher UTS than FAC and CAC welded joints.…”

Section: Tensile Analysissupporting

confidence: 86%

Effect of in-process cooling on microstructure and mechanical properties of dissimilar AA2014 and AA7075 friction stir welded joints

Kumar

Upadhyay

Misra

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Heat-carrying capacity of a cooling medium is critical as it governs microstructure evolution and tensile properties during friction stir welding (FSW). In this research, three cooling techniques: conventional air-cooling (CAC), forced air-cooling (FAC), and water flow cooling (WFC), were employed to study the effect on microstructure and mechanical properties in dissimilar FSW of AA2014 and AA7075. In-process cooling significantly influenced weld microstructure, zone size, microhardness, and tensile properties, which varied with the cooling medium. Water flow cooling was the most effective cooling technique due to its higher heat carrying capacity than CAC and FAC. Water flow cooling resulted in a drastically refined grains structure of smaller size in all zones, had higher tensile strength, elongation, and heat-affected (HAZ) hardness than CAC and FAC. Greatly refined grain structure and less dissolution of precipitates in weld nugget zone (WNZ) along with smaller HAZ and thermo-mechanically affected zone (TMAZ) are responsible for improved weld properties of WFC than the FAC and CAC. Forced air-cooling resulted in a higher microhardness value at WNZ, followed by WFC and CAC. Fractured surfaces of the tensile specimen were scrutinized by scanning electron microscope. Cooling did not affect the fracture side and location; however, fracture mode changed with cooling medium viz. ductile for FAC and WFC and mixed-mode for CAC.

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Section: Tensile Analysissupporting

confidence: 86%

Effect of in-process cooling on microstructure and mechanical properties of dissimilar AA2014 and AA7075 friction stir welded joints

Kumar

Upadhyay

Misra

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Aluminum alloys and other sheet materials, including steel grades (coated and uncoated), can be joined via FSSW and FSW. 5,6,7 Galvanized steel, dual-phase steel, complex-phase steel, coated steel, transformation-induced plasticity steel (TRIP), stainless steel, and low-carbon steel can undergo FSSW. FSSW and FSW of steel grades to aluminum grades have also been observed.…”

Section: Introductionmentioning

confidence: 99%

Friction stir spot welding of dissimilar quality galvanized steel sheets meant for automotive applications using a consumable sheet

Gupta

Das

Narayanan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Friction stir spot welding (FSSW) is a solid-state spot-joining method used to join aluminum alloys to other materials for fabricating lightweight components. However, the FSSW tool experiences wear and tear during the spot welding of steel-grade sheets. To overcome this problem, in the present work, friction stir spot welding using a consumable sheet (FSSW-C) is proposed, in which the tool does not contact the steel sheet during the entire welding cycle. The main aim of this study is to investigate the application of FSSW-C to dissimilar galvanized steel sheets at various rotational speeds via lap shear tests and examination of the joint macro/microstructures. The lap shear performance was also compared to that of the Self Pierce Rivet (SPR) joint. The results revealed that galvanized steel sheets were successfully spot welded using FSSW-C with a lap shear fracture load of 1.5 kN–2.2 kN, which is approximately 50% of that of SPR joints. The microstructures revealed important features, including microstructural zones such as the stir zone, thermomechanically-affected zone, and heat-affected zone. Intermetallic compound formation was not observed at the joint interface. As the rotational speed increased, the axial force and torque decreased, whereas the temperature increased during FSSW-C. The energy generated increased with an increase in the rotational speed and was significantly different when compared to the data for conventional FSSW.

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Microstructural and Mechanical Properties Characterization of Resistance Spot Welded Aluminum Alloy AA6063

Sharma¹,

Chandra²,

Rajak³

et al. 2022

Lecture Notes in Mechanical Engineering

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Microstructure and mechanical properties of dissimilar friction stir welds of AA2014 and AA7075

Cited by 6 publications

References 38 publications

Effect of in-process cooling on microstructure and mechanical properties of dissimilar AA2014 and AA7075 friction stir welded joints

Effect of in-process cooling on microstructure and mechanical properties of dissimilar AA2014 and AA7075 friction stir welded joints

Friction stir spot welding of dissimilar quality galvanized steel sheets meant for automotive applications using a consumable sheet

Microstructural and Mechanical Properties Characterization of Resistance Spot Welded Aluminum Alloy AA6063

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