Defect features and mechanical properties of friction stir lap welded dissimilar AA2024–AA7075 aluminum alloy sheets

Song, Yi; Yang, Xinqi; Cui, Lei; Hou, Xinbin; Shen, Zhikang; Xü, Yao

doi:10.1016/j.matdes.2013.09.062

Cited by 150 publications

(73 citation statements)

References 25 publications

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“…It is clear from the macrographs that obvious defects are observed in the samples at most process parameters. Actually, FSLW was developed based on the principle of FSW, and FSW has been widely found to have the characteristic of narrow parameter range [16][17][18][19][20]. For the current case, it is more difficult to produce high-quality welds by FLSW compared with the widely studied friction stir butt welding.…”

Section: Single-track Friction Stir Lap Weldingmentioning

confidence: 99%

Multi-Track Friction Stir Lap Welding of 2024 Aluminum Alloy: Processing, Microstructure and Mechanical Properties

Zou

Liu

et al. 2016

Metals

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Friction stir lap welding (FSLW) raises the possibility of fabricating high-performance aluminum components at low cost and high efficiency. In this study, we mainly applied FSLW to fabricate multi-track 2024 aluminum alloy without using tool tilt angle, which is important for obtaining defect-free joint but significantly increases equipment cost. Firstly, systematic single-track FSLW experiments were conducted to attain appropriate processing parameters, and we found that defect-free single-track could also be obtained by the application of two-pass processing at a rotation speed of 1000 rpm and a traverse speed of 300 mm/min. Then, multi-track FSLW experiments were conducted and full density multi-track samples were fabricated at an overlapping rate of 20%. Finally, the microstructure and mechanical properties of the full density multi-track samples were investigated. The results indicated that ultrafine equiaxed grains with the grain diameter about 9.4 µm could be obtained in FSLW samples due to the dynamic recrystallization during FSLW, which leads to a yield strength of 117.2 MPa (17.55% higher than the rolled 2024-O alloy substrate) and an elongation rate of 31.05% (113.84% higher than the substrate).

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Section: Single-track Friction Stir Lap Weldingmentioning

confidence: 99%

Multi-Track Friction Stir Lap Welding of 2024 Aluminum Alloy: Processing, Microstructure and Mechanical Properties

Zou

Liu

et al. 2016

Metals

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“…There are extensive researches about friction stir welding of 2000 series aluminum alloys and 7000 series aluminum alloys at home and abroad, but the research on dissimilar joint of 2A16 and 7075 aluminum alloys is few [6][7][8][9]. In this paper, 2A16/7075 aluminum alloys with the same kinds of aluminum alloys and different ones were respectively welded by friction stir welding.…”

Section: Introductionmentioning

confidence: 99%

Research on Microstructure and Properties of Friction Stir Welding Joint of 2A16 and 7075 Aluminum Alloy

Chen¹,

Tang²,

Zhang³

et al. 2017

dtetr

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ABSTRACT The joint of 2A16-7075,7075-7075 and 2A16-2A16 aluminum alloy were obtained by friction stir welding under the condition of the stir head rotating speed of 1000rpm and welding speed of 100mm/min. The morphology of nugget area in different joints by metallographic microscope and tensile test, impact test and hardness test of joints were done. The results show that the microstructure in weld nugget is equiaxed grain，fine isometric crystal structure，which has been dynamic recrystallized. Grain of TMAZ changed greatly, which has elongated microstructure, the microstructure in HAZ was coarsened compared with base material. The tensile strength of 2A16-2A16 friction stir welding joint is 188Mpa and that of the 7075-7075 joint is 172Mpa, but that of the 2A16-7075 joints is only 93Mpa. Impact test showed that impact energy of the same material of friction stir welding joint is higher than that of the dissimilar joint, the impact energy of 2A16-2A16 joint is the highest, which is 22.81J, Impact absorbing energy of base material is less than that of the weld nugget zone at room temperature. The hardness distribution of three friction stir welding joint show "W" type roughly. The hardness on both sides of the base material is the maximum, the hardness in the HAZ and TMAZ decline. The hardness values of NZ is higher than that of the HAZ, hardness at the junction of different regions has abrupt change.

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“…FSW owns many joint configurations, such as butt joint, lap joint, corner joint, and T joint [1]. In particular, lap joints are always used in transportation industries, including aircraft fuselage panels, airplane wings, and ship decks [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, some works about FSLW have been reported [2,[8][9][10][11][12][13], including tool geometries, welding parameters, similar and dissimilar materials. Yang et al [10] used three different tools (cylindrical threaded tool, pie-shaped tool, and triangular tool) to fabricated AZ31 magnesium alloy FSLW joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of rotating speed on joint morphology and lap shear properties of stationary shoulder friction stir lap welded 6061-T6 aluminum alloy

Zhou

Yue

et al. 2016

Int J Adv Manuf Technol

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In the present study, stationary shoulder technology was used to fabricate 6061-T6 friction stir lap welding (FSLW) joints. Effects of tool rotating speed on joint features and lap shear properties of the lap joints were mainly discussed. Similar to SSFSW, lap joint with smooth surface, without flash, shoulder marks and inner defects can be obtained using the stationary shoulder system. With increasing the rotating speed, effective sheet thickness (EST) firstly increases and then decreases. Effective lap width (ELW) gradually increases. The maximum EST and ELW are attained at 1200 and 1600 rpm, respectively. The maximum lap shear failure load of 17.01 kN is attained using rotating speed of 1400 rpm. The SSFSLW joints fracture in two modes: tensile fracture and shear fracture. All joints present ductile fracture mode.

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Defect features and mechanical properties of friction stir lap welded dissimilar AA2024–AA7075 aluminum alloy sheets

Cited by 150 publications

References 25 publications

Multi-Track Friction Stir Lap Welding of 2024 Aluminum Alloy: Processing, Microstructure and Mechanical Properties

Multi-Track Friction Stir Lap Welding of 2024 Aluminum Alloy: Processing, Microstructure and Mechanical Properties

Research on Microstructure and Properties of Friction Stir Welding Joint of 2A16 and 7075 Aluminum Alloy

Effect of rotating speed on joint morphology and lap shear properties of stationary shoulder friction stir lap welded 6061-T6 aluminum alloy

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