Repairing of exit-hole in dissimilar Al-Mg friction stir welding: Process and microstructural pattern

Mehta, Kush P.; Patel, Rahul; Vyas, Hardik; Memon, Shabbir; Vilaça, Pedro

doi:10.1016/j.mfglet.2020.01.002

Cited by 39 publications

(16 citation statements)

References 18 publications

(23 reference statements)

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“…In case of FSSW, the formation of exithole/keyhole is a biggest problem, wherein the volumetric material is missing. This keyhole is inevitable due to penetration of tool's probe in workpiece, which is subsequently a location for stress concentration and corrosion initiation [17,18]. This keyhole can be greatly eliminated using modified friction stir clinching (MFSC) process, wherein protuberance leveling and keyhole filling are obtained in the second phase of process using probeless tool.…”

Section: Introductionmentioning

confidence: 99%

Metallurgical and Mechanical Properties of Al–Cu Joint by Friction Stir Spot Welding and Modified Friction Stir Clinching

2020

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Dissimilar joints of AA5083 and pure Cu joint are successfully produced and compared by friction stir spot welding and modified friction stir clinching with intermediate layer of Zn interlayer for the first time. Self-reacting behavior of Zn is observed to obtain sound welds resulted from intermixing in stir zone (in FSSW), refilled zone (in MFSC) and brazed zone (in both FSSW and MFSC). MFSC is used to fill the cavity of keyhole that in turn increased 40 % strength of dissimilar Cu-Al joints. Presence of lamellar eutectics in brazed zone and intermetallic compounds such as Al2Cu, Al4Cu9, CuZn5 and Cu4Zn in weld zone are confirmed in Cu-Al MFSC joints.

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Section: Introductionmentioning

confidence: 99%

Metallurgical and Mechanical Properties of Al–Cu Joint by Friction Stir Spot Welding and Modified Friction Stir Clinching

2020

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“…They subjected prob-less tool from the revert side on spot of clinching that in turn lead protuberance of material in the cavity of exit-hole along with similar leveling of base material. Mehta et al [17] repaired exit-hole of dissimilar Al-Mg friction stir welds with enhanced material mixing using probeless tool. They applied higher diameter prob-less tools in two different post welding stages at the exithole location with two subsequent progressive plunge depths to fill the cavity of exithole.…”

Section: Introductionmentioning

confidence: 99%

Effect of shoulder features during friction spot extrusion welding of 2024-T3 to 6061-T6 aluminium alloys

Han

Paidar

Vignesh

et al. 2020

Archiv.Civ.Mech.Eng

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Friction spot extrusion welding process is successfully performed on dissimilar aluminum alloys of AA2024-T3 and AA6061-T6 under the influence of shoulder features. The joints were analysed by microstructural features and mechanical properties using conventional and advanced tools of visual inspection, optical microscopy, scanning electron microscopy, transmission electron microscopy, electron back scattered diffractions, tensile testing and hardness testing. The results revealed that the joining was obtained by combination of mechanical locking from extruded material of top surface to predrilled bottom surface and diffusion in solid state. The stir zone and plastically deformed metal flow zone were influenced by scroll shoulder and smooth shoulder features. The tensile specimen of scroll shoulder was resulted to higher fracture load of 6381 N whereas the same was 4916 N in case of smooth shoulder. The interface of between plastically deformed metal flow zone and base material of AA6061-T6 can be considered as critical/weakest zone in case of friction spot extrusion. The variations of hardness were observed in stir zone, plastically deformed metal flow zone and thermo-mechanically affected zone in case of friction spot extrusion welding process.

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“…Friction stir processing (FSP) [17] was invented as grain modification technique [18][19][20][21] derived from friction stir welding [22][23][24][25][26][27]. Later, FSP is applied as composite manufacturing technique with a concept of particles insertion and subsequent distribution in base material to produce metal matrix-type composite structure [3][4][5][6][28][29][30].…”

Section: Fabrication Techniques For Fullerene-based Nanocompositesmentioning

confidence: 99%

Fabrication and applications of fullerene-based metal nanocomposites: A review

Kumar

Namboodiri

Joshi

et al. 2021

Journal of Materials Research

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Several fabrication methods have been proposed to develop the metal matrix nanocomposites (MMNCs) reinforced by carbon nanomaterials (mostly the nanotubes, and graphene) by means of the liquid-state and the solid-state techniques. The spraying processes, the squeeze casting, the disintegrated melt deposition processes, the milling fabrication, and the friction stir processing have been used to fabricate the composite. However, the MMNCs, containing the fullerenes as reinforcement, are less known, although the properties of these objects with the predominant sp 2 bonding also extend their use in the composites. Fullerenes are hollow carbon molecules in the form of a sphere (buckyballs). Buckyballs can be essentially regarded as graphite layers, i.e., graphene sheets, wrapped into a spherical shape. Considering the staggering cost and limited availability of purified single-walled carbon nanotubes (CNTs) and graphene, fullerenes with a spherical structure offer an interesting alternative to CNTs and graphene since they are available in abundance and at a much feasible cost. Furthermore, fullerenes offer a high degree of purity and maintain their quality even during the subsequent reproduction cycles. Thus currently, the fullerenes are widely investigated and have the potential for various technical applications. A significant potential application of fullerenes would be as reinforcement in metallic alloys used in structural parts. It should be noted that buckyballs, such as C 60 fullerenes, may be considered as fascinating reinforcements in comparison to CNT or graphene, due to their zero-dimensional geometry. They can be easily dispersed and are scarcely damaged during severe mechanical dispersion processes carried out in metal matrix composites. Fullerene has a great impact on Tribology applications due to its lubricating behavior. The spherical morphology and strong intermolecular bonding make fullerene as a lubricant material for industrial applications. This article will showcase in-depth analysis on collective information of fullerene-based nanocomposites.

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Repairing of exit-hole in dissimilar Al-Mg friction stir welding: Process and microstructural pattern

Cited by 39 publications

References 18 publications

Metallurgical and Mechanical Properties of Al–Cu Joint by Friction Stir Spot Welding and Modified Friction Stir Clinching

Metallurgical and Mechanical Properties of Al–Cu Joint by Friction Stir Spot Welding and Modified Friction Stir Clinching

Effect of shoulder features during friction spot extrusion welding of 2024-T3 to 6061-T6 aluminium alloys

Fabrication and applications of fullerene-based metal nanocomposites: A review

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