Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of AA7039 aluminum alloy

Sharma, Chaitanya; Dwivedi, Dheerendra Kumar; Kumar, Pradeep

doi:10.1016/j.matdes.2011.10.054

Cited by 151 publications

(81 citation statements)

References 26 publications

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“…In the meantime, it is found obviously that a larger extent of plastic deformation occurs in the TMAZ and HAZ of the AS than that of the RS. The main reason is that the AS experiences more plastic strains than the RS which in turn results in more deformation heat causing a higher temperature close to the weld center [28].…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of 2060 aluminum lithium alloy

Mao

Liu

et al. 2015

Int J Adv Manuf Technol

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Two-millimeter-thick 2060 Al-Li alloy plates were friction stir welded under a welding speed of 95-150 mm/min and rotation speed of 750-1500 rpm. The effects of welding speed and rotation speed on formation quality, microstructure, secondary phase particles' transformation, and mechanical properties of the joints were investigated. The results show that defect-free joints are produced for varying friction stir welding (FSW) parameters, and nugget size increases firstly and then decreases with increasing rotation speed or decreasing welding speed. The weld nugget zones (WNZs) have fine dynamically recrystallized grains, and the size decreases to 7.9 μm with increasing rotation speed to 1180 rpm or decreasing welding speed to 118 mm/min, while the grains are coarsened at 1500 rpm or 95 mm/min. A similar trend occurs in the transformation of secondary phase particles, whose size is the smallest in WNZ at 1180 rpm-118 mm/min. All joints exhibit softened zones where the hardness is the lowest, and the joints fracture from WNZs or heat-affected zones. The joints welded at 1180 rpm-118 mm/min perform the highest ultimate tensile strength of 495 MPa, yield strength of 380 MPa, and elongation of 10.2 %. With increasing rotation speed or decreasing welding speed, the strengths and elongation of the joints increase firstly and then decrease.

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Section: Microstructure Characterizationmentioning

confidence: 99%

Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of 2060 aluminum lithium alloy

Mao

Liu

et al. 2015

Int J Adv Manuf Technol

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“…The ultimate tensile strength of AA5083-AA5083 was 255Mpa, 23% lower than AA5083 base metal. Sharma et al found that similar joint of AA6061-AA6061 shows 66% welding efficiency from the base metal AA6061 [38]. The strength of joints can be improved according to the sensitivity of the base metal, tool rotation as well as transverse speed as mentioned by Uematsu et al [31].…”

Section: Methodsmentioning

confidence: 97%

Friction stir welding of similar and dissimilar aluminium alloys for automotive applications

Selamat

Baghdadi

Sajuri³

et al. 2016

Int. J. Automot. Mech. Eng.

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Aluminium alloys are lightweight materials relatively used in automotive industries. However, welding using the conventional welding methods is known to be difficult. In this study, the friction stir welding (FSW) known as the solid state joining process was extensively used for joining similar and dissimilar 5 mm aluminium alloy plates. The butt-joint type of similar joints (AA5083-AA5083) and dissimilar joints (AA5083-AA6061) were carried out under the same welding parameters; 1000 rpm (rotational speed) and 100 mm/min (transverse speed). Macro-and microstructural observations were acquired at the cross-section of the weld regions by stereo and optical microscopes. The microstructural study showed that the formation of 'onion ring' structure was detected in the nugget zone of similar joints, while wavy and distorted patterns appeared in dissimilar joints. All tensile specimens of similar welding joint showed similar fracture patterns where all fractures occurred in the thermo-mechanically affected zone (TMAZ). However, tensile specimens of dissimilar welding joint broke up at the TMAZ region as well as at Al6061 base metal at the retreating side. The tensile strength of similar joint and dissimilar joint was 22% and 19% lower compared to the base metal of Al5083 and Al6061.

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“…Researchers attempt to produce an efficient joints (comparing the ratio of the strength of the welded joints to the strength of the base metal) by widely investigating the welding process parameters [3]. The main welding process parameters that can be controlled are the rotational speed, the transverse speed, the axial force applied by the shoulder of the tool on the work-piece, the tool tilt angle and tool geometry [4][5][6][7]. Heat input during the welding process is affected by the processing parameters of FSW [8].…”

Section: Introductionmentioning

confidence: 99%

Increasing of the Mechanical Properties of Friction Stir Welded Joints of 6061 Aluminum Alloy by Introducing Alumina Particles

Tashkandi

Al-jarrah

Ibrahim

2017

Advances in Materials Science

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The main aim of this investigation is to produce a welding joint of higher strength than that of base metals. Composite welded joints were produced by friction stir welding process. 6061 aluminum alloy was used as a base metal and alumina particles added to welding zone to form metal matrix composites. The volume fraction of alumina particles incorporated in this study were 2, 4, 6, 8 and 10 vol% were added on both sides of welding line. Also, the alumina particles were pre-mixed with magnesium particles prior being added to the welding zone. Magnesium particles were used to enhance the bonding between the alumina particles and the matrix of 6061 aluminum alloy. Friction stir welded joints containing alumina particles were successfully obtained and it was observed that the strength of these joints was better than that of base metal. Experimental results showed that incorporating volume fraction of alumina particles up to 6 vol% into the welding zone led to higher strength of the composite welded joints as compared to plain welded joints

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Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of AA7039 aluminum alloy

Cited by 151 publications

References 26 publications

Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of 2060 aluminum lithium alloy

Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of 2060 aluminum lithium alloy

Friction stir welding of similar and dissimilar aluminium alloys for automotive applications

Increasing of the Mechanical Properties of Friction Stir Welded Joints of 6061 Aluminum Alloy by Introducing Alumina Particles

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