Towards Qualification of Friction Stir Welding to AA5083-O and AA5052-O Aluminum Alloys

Sangalli, Guilherme; Lemos, Guilherme Vieira Braga; Martinazzi, Douglas; Lessa, Cleber Rodrigo de Lima; Beskow, Arthur Bortolin; Reguly, Afonso

doi:10.1590/1980-5373-mr-2019-0349

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…However, the use of a continuous welding line process instead of weld spots leads to higher structural stiffness and better crash performance [9]. Friction stir welding (FSW) of the AA5000 series represents a promising technique to obtain defect-free and sound joints, either in similar [10] and dissimilar [11][12][13] welding combinations. FSW can also be used effectively for the welding of different types of materials [14][15][16][17], and the same principle of FSW can be used for the development of metal matrix composites [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Grain Structure, Crystallographic Texture, and Hardening Behavior of Dissimilar Friction Stir Welded AA5083-O and AA5754-H14

Ahmed

Ataya

Seleman

et al. 2021

Metals

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This work investigated the effect of friction stir welding (FSW) tool rotation rate and welding speed on the grain structure evolution in the nugget zone through the thickness of the 10 mm thick AA5083/AA5754 weldments. Three joints were produced at different combinations of FSW parameters. The grain structure and texture were investigated using electron backscattering diffraction (EBSD). In addition, both the hardness and tensile properties were investigated. It was found that the grain size varied through the thickness in the nugget (NG), which was reduced from the top to the base in all welds. Reducing the rotation rate from 600 rpm to 400 rpm at a constant welding speed of 60 mm/min reduced the average grain size from 33 µm to 25 µm at the top and from 19 µm to 12 µm at the base. On the other hand, the increase of the welding speed from 20 mm/min to 60 mm/min had no obvious effect on the average grain size. This implied that the rotation rate was more effective in grain size reduction than the welding speed. The texture was the mainly simple shear texture that required some rotations to obtain the ideal simple shear texture. The hardness distribution, mapped for the nugget zone, and the parent alloys indicated a diffused softened welding zone. The heating effect of the pressure and rotation of the pin shoulder and the heat input parameter (ω/v) on the hardness value of the nugget zone were dominating. Tensile stress-strain curves of the base alloys and that of the FSWed joints were evaluated and presented. Moreover, the true stress-true strain curves were determined and described by the empirical formula after Ludwik, and then the materials strengthening parameters were determined. The tensile specimens of the welded joint at a revolution speed of 400 rpm and travel speed of 60 mm/min possessed the highest strain hardening parameter (n = 0.494).

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Section: Introductionmentioning

confidence: 99%

Grain Structure, Crystallographic Texture, and Hardening Behavior of Dissimilar Friction Stir Welded AA5083-O and AA5754-H14

Ahmed

Ataya

Seleman

et al. 2021

Metals

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“…Welds produced from annealed metal, such as AA5083 in the O condition, do not exhibit a typical hardness drop in HAZ [16]. In the direction of the weld nugget, usually a higher hardness than the base metal in O condition can be noted due to modest hot work-hardening, and finally, grain refinement in the nugget zone [30]. The formation of the weld nugget eliminates the prior deformation microstructure in cold worked material and as a result, the hardness of the nugget zone is independent of the original base metal condition [31].…”

Section: Resultsmentioning

confidence: 99%

Influence of the Tool Rotational Speed on Physical and Chemical Properties of Dissimilar Friction-Stir-Welded AA5083/AA6060 Joints

Laska

Szkodo

Cavaliere

et al. 2022

Metals

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Aluminum alloys have been successfully used in the railroad and automotive industries because of their potential to significantly reduce component weights, and their good mechanical and anti-corrosion properties. Problems with joining aluminum alloys are characterized by low weldability, which influences the need for studies focused on unconventional methods. The environmentally friendly and low-cost friction-stir-welding method enables the material to be joined without melting. In the following study, dissimilar butt joints were produced from AA5083 and AA6060 alloys. A constant tool traverse speed of 100 mm/min and a tool tilt angle of 2º were used, combined with tool rotational speeds of 800, 1000 and 1200 RPM. It was revealed that as the tool speed increases, the hardness in the weld nugget zone increases, due to higher heat input and more effective recrystallization. The highest hardness of the weld nugget zone was observed for the weld that was produced with the highest tool rotational speed, and was equal to 1.07 GPa, compared to the hardness of both parent materials of 0.75 and 1.15 GPa for AA5083 and AA6060, respectively. Increasing the heat input also decreased the hardness of the heat-affected zone, where recrystallization was not observed. The lowest density of dislocations with the highest mobility was observed in the heat-affected zone on the AA6060 side, which also contributed to the reduction in strength in this zone. The produced welds exhibited corrosion resistance between both parent materials, with the lowest corrosion current density being 6.935 ± 0.199 µA·cm–2 for the weld that was produced at a tool speed of 1200 RPM.

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“…Employment of other ranges of speeds of tool traverse (including 0.5, 1.0, 2.0 and 2.5 mm/sec) had only resulted in the attainment of defective joints. It reveals that the employed 1.5mm/sec tool traverse speed have permitted the threaded cylindrically tapered pin geometry of the tool and its shoulder to soften the inner and exterior regions of the parent metals for a sufficient time, thereby, leading to the attainment of remarkable quality joints of distinctive alloys of Mg 16,35,42,43 .…”

Section: Investigations On Joint No:ii-3mentioning

confidence: 99%

Effect of Tool Pin Geometry and Process Parameters During FSW of Dissimilar Alloys of Mg

Yaknesh¹,

Sampathkumar²,

Sevvel³

2022

Mat. Res.

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Effect of two distinctive tool designs along with other tool related parameters including speed of traverse of tool and offset distance of tool pin during friction stir welding of dissimilar AZ91C and AZ31B alloys of Mg were investigated. Experimental recordings revealed that all the joints fabricated during 1 st set of investigations employing cylindrically tapered pin geometry and their offset distances being 0.5 mm or 1mm towards any one of the parent metals possessed flaws. Joint No: II-3 fabricated in 2 nd set of investigations by employing 15mm diameter inner shoulder tool with threaded cylindrical tapered pin geometry at a tool offset distance of 0 mm was found be free from flaws. This joint exhibited a tensile strength of 186 MPa which was 78.81% of AZ91C and 70.72% of another parent metal AZ31B. Existence of intermetallic phased constituents, namely, Mg 17 Al 12 in several regions of fractured surfaces have contributed to the supplementary brittleness in the zone of nugget, and have reduced the tensile strength of the joint.

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Towards Qualification of Friction Stir Welding to AA5083-O and AA5052-O Aluminum Alloys

Cited by 8 publications

References 17 publications

Grain Structure, Crystallographic Texture, and Hardening Behavior of Dissimilar Friction Stir Welded AA5083-O and AA5754-H14

Grain Structure, Crystallographic Texture, and Hardening Behavior of Dissimilar Friction Stir Welded AA5083-O and AA5754-H14

Influence of the Tool Rotational Speed on Physical and Chemical Properties of Dissimilar Friction-Stir-Welded AA5083/AA6060 Joints

Effect of Tool Pin Geometry and Process Parameters During FSW of Dissimilar Alloys of Mg

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