Effect of welding parameters on mechanical and microstructural properties of dissimilar AA6082–AA2024 joints produced by friction stir welding

Cavaliere, Pasquale; Santis, A. De; Panella, F.W.; Squillace, Antonino

doi:10.1016/j.matdes.2008.05.044

Cited by 228 publications

(83 citation statements)

References 15 publications

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“…Amongst various strengthening mechanisms reported, refinement in grain size is the most suitable for strength improvement without compromising in ductility [1]. This has led to the quest of fabricating materials with small grain sizes, in ultrafine grained (UFG, ∼0.1-1 m) or even smaller (<100 nm).…”

Section: Introductionmentioning

confidence: 99%

Microstructure and texture evolution during accumulative roll bonding of aluminium alloy AA5086

Roy

Singh

Suwas

et al. 2011

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Microstructure and texture evolution during accumulative roll bonding of aluminium alloy AA5086

Roy

Singh

Suwas

et al. 2011

Materials Science and Engineering: A

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“…The TMAZ zone is a specific characteristic of friction stir welded joints. This region is located at the frontier of the weld nugget and therefore is submitted to a certain amount of deformation; however, it is widely accepted that the amount of deformation is not enough to induce any microstructural changes such as recrystallization [21][22][23]. Therefore, it can be reasonably assumed that in the present investigation, the TMAZ has also experienced significantly lower deformation and has not gone through recrystallization.…”

Section: Microstructure Evolution With Pin Geometrymentioning

confidence: 84%

Friction stir lap welding of 5456 aluminum alloy with different sheet thickness: process optimization and microstructure evolution

Salari

Jahazi

Khodabandeh

et al. 2015

Int J Adv Manuf Technol

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The influences of friction stir welding process parameters on microstructure evolution and mechanical properties of lap welded 5456 aluminum alloy plates with different thickness and temper conditions were investigated. The upper plate was 5mm thick, cold rolled aluminum alloy 5456-T321 and the lower plate was 2.5mm annealed sheet (5456-O). Four different pin geometries (conical thread pin, cylindrical-conical thread pin, stepped conical thread pin, and Flared Triflute pin tool) and two rotational speeds (600 and 800rpm) were used to produce the joints. Microstructures and microhardness values in the weld nugget (WN), thermomechanically affected zone (TMAZ), and the heat affected zone (HAZ) were examined and correlated with selected processing conditions. Specifically, the influence of tool geometry on the flow of the plasticized material in the nugget zone, extent of hooking defect, and mechanical properties (microhardness) of the FSW joints were documented and quantified.It was found that weld joints made by using the stepped conical thread pin tool produced a homogeneous microstructure with finer grain size (5.4 µm) and higher microhardness levels than the other tools. The optimum processing conditions resulting in sound and defect free joints with highest mechanical properties were obtained with the stepped conical thread pin and 600rpm rotational speed.The evolution of the microhardness in each region is characterized and related to processing conditions.

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“…In recent years, non-ferrous materials which has high strength to low weight properties have substantial consideration in aerospace, automotive industries, ship building and cryogenic application to enhance the fuel efficiency in transportation industry and moderate the environmental issues [1][2][3]. Moreover, the weight of the structures can be reduced with the fabrication of different products to obtain the several advantages of the aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Friction Stir processing on Gas Tungsten Arc Welding of 2024 Aluminum Alloy Weld Zone

al.¹

2018

IJMPERD

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Gas tungsten arc welding is the most commonly used process for joining of AA 2024 alloys, which are highly demanded in aircraft structural applications. The quality of the welds and strength of the welded joints achieved using this process, the weld fusion zone of this alloys usually exhibit the columnar grains, which are coarser than the substrate, due to the persisting thermal conditions when the fusion zone starts to solidify. This kind thermal attribution often causes to degrade the strength of the weld metal and lead to impair its resistance to sustain the hot cracking issues. In addition, there are some unavoidable micro structural defects formations such as porosity and micro cracks in the fusion zone. The formation of these defects at the top of the fusion zone will result in the reduction of weld strength about to half of the base metal strength. The present study will focus on the improvement of micro structural and mechanical properties of the gas tungsten arc welded 2024 aluminium alloys using a novel approach of friction stir processing procedures. In order to overcome these issues, the top surfaces of the gas tungsten arc welds are processed using friction stir processing up to certain depth from the top of the welds. The weld metal micro structural characterization studies revealed that the friction stir processing was controlled or decreased the amount of porosities and micro cracks formation. In addition, it destroyed the coarse grains dendritic structure in the weld zone and helped to dissolves the precipitates of secondary particles, which exists along the grain boundaries. The changes in the weld microstructures and grain refinement significantly improved the hardness of the friction stir processed welds over the base metal and gas tungsten arc welds. The mechanical properties also significantly changed along with the quality of the weldments. In addition, the formation of very fine precipitates is observed in stir zone due to the effect of intense plastic deformation and temperatures during friction stir processing.

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Effect of welding parameters on mechanical and microstructural properties of dissimilar AA6082–AA2024 joints produced by friction stir welding

Cited by 228 publications

References 15 publications

Microstructure and texture evolution during accumulative roll bonding of aluminium alloy AA5086

Microstructure and texture evolution during accumulative roll bonding of aluminium alloy AA5086

Friction stir lap welding of 5456 aluminum alloy with different sheet thickness: process optimization and microstructure evolution

Analysis of the Influence of Friction Stir processing on Gas Tungsten Arc Welding of 2024 Aluminum Alloy Weld Zone

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