Temperature evolution, microstructure, and properties of friction stir welded ultra-thick 6082 aluminum alloy joints

Zhu, Rui; Gong, Wenbiao; Cui, Heng

doi:10.1007/s00170-020-05422-7

Cited by 30 publications

(7 citation statements)

References 26 publications

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“…The average grain size of the SZ is increased with increasing the rotation speed from 400 to 1000 due to the increase in heat input (Figure 6). The coarse particles of (Fe, Mn) 3 SiAl l2 in the BMs have fragmented into small particles and redistributed in the aluminum matrix due to the stirring action in the SZ, whereas the fine precipitates (Mg 2 Si) are coarse in the SZ, which may be attributed to the dissolution and regrowth during the thermal cycle of welding, followed by air cooling [27,41]. Furthermore, the TMAZ grains (Figures 11c, 12c, 13c and 14c) are noticeably rotated and deformed along with the material flow during the stirring action of the tool material.…”

Section: Microstructure Investigationmentioning

confidence: 99%

Friction Stir Spot Welding of Different Thickness Sheets of Aluminum Alloy AA6082-T6

et al. 2022

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Friction stir spot welding (FSSW) is one of the important variants of the friction stir welding (FSW) process. FSSW has been developed mainly for automotive applications where the different thickness sheets spot welding is essential. In the present work, different thin thickness sheets (1 mm and 2 mm) of AA6082-T6 were welded using FSSW at a constant dwell time of 3 s and different rotation speeds of 400, 600, 800, and 1000 rpm. The FSSW heat input was calculated, and the temperature cycle experience during the FSSW process was recorded. Both starting materials and produced FSSW joints were investigated by macro- and microstructural investigation, a hardness test, and a tensile shear test, and the fractured surfaces were examined using a scanning electron microscope (SEM). The macro examination showed that defect-free spot joints were produced at a wide range of rotation speeds (400–1000 rpm). The microstructural results in terms of grain refining of the stir zone (SZ) of the joints show good support for the mechanical properties of FSSW joints. It was found that the best welding condition was 600 rpm for achieving different thin sheet thicknesses spot joints with the SZ hardness of 95 ± 2 HV0.5 and a tensile shear load of 4300 ± 30 N.

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Section: Microstructure Investigationmentioning

confidence: 99%

Friction Stir Spot Welding of Different Thickness Sheets of Aluminum Alloy AA6082-T6

et al. 2022

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“…The temperature difference in the core area of the weldment directly affects the joint structure, which ultimately affects the mechanical properties of the welded joint. Scholars have found that the part that hinders the overall tensile strength of the joint is the bottom joint of the core area [25][26][27]. If the bottom temperature increases, the dynamic recrystallization degree increases, the grain boundary angle increases, and the tensile strength of the joint increases.…”

Section: Optimization Of Welding Parameters In Plunging and Dwelling ...mentioning

confidence: 99%

Welding parameters optimization during plunging and dwelling phase of FSW 2219 aluminum alloy thick plate

Lü

Qiao

Qian

et al. 2022

Int J Adv Manuf Technol

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The in uence of welding parameters on temperature distribution in plunging and dwelling phase of friction stir welding (FSW) medium thickness 2219 aluminum alloy is blank. Improper selection of welding parameters will result in uneven temperature distribution along the thickness of the weldment, which will lead to welding defects and ultimately affect the mechanical properties of the weldment. To realize the prediction of temperature distribution and achieve the optimization of welding parameters, a simulation model of FSW 18mm thick 2219 aluminum alloy is built based on DEFORM. The validity of the simulation model is veri ed by temperature measurement experiments. With the minimum temperature difference in the core area of the weldment as target value, and weldable temperature range of 2219 aluminum alloy as constraint conditions, orthogonal experiments are conducted considering the rotational speed, the press amount, the tool tilt angle, the plunging traverse speed and the dwelling time.The results of variance analysis show that the rotational speed and the dwelling time are signi cant factors affecting temperature eld during plunging and dwelling phase. Through single factor simulation, the welding parameters in plunging and dwelling phase are optimized. This study provides a reference for realizing high-quality welding of a heavy rocket fuel tank.

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“…Sufficient work reporting mechanical properties on AA6082 plates less than 8-10 mm in thickness is available. The mechanical properties including joint efficiency of the AA6082 thick plate joints are generally not reported [9,39,40]. The work which investigated mechanical properties of the plates with thicknesses less than 10 mm reports joint efficiencies of 71% [21], 70% [41], and even 48% [42].…”

Section: Tensile Propertiesmentioning

confidence: 99%

The Effect of Tool Design on the Friction Stir Welding of Thick Aluminum Alloy AA6082-T651 Extruded Flats

Bajaj

Siddiquee

Mukhopadhyay

et al. 2020

Metallogr. Microstruct. Anal.

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Fifteen-millimeter-thick aluminum alloy AA6082-T651 extruded flats were friction-stir-welded by using three different types of tool pin profiles, i.e., (1) conical with only left-hand threads (CL), (2) conical with both left-hand and right-hand threads (CLR), and (3) conical cam-tri-flute with left-hand threads (CTFL) up to a height of 6 mm from the pin tip. The microstructures and the mechanical properties across the weld thickness were characterized. Tunneling defect was found at the weld-bottom for the CL tool pin profile and at the weld-top for the CLR pin profile. The reasons behind the formation of such defects have been analyzed and discussed. On the other hand, a defect-free joint was obtained with the CTFL pin profile. Tensile test samples were machined from top, middle, and bottom sections of the welds, and tensile strengths were measured for all the sections to determine the joint efficiencies. Scanning electron microscopy and energy-dispersive X-ray spectroscopy were employed to identify and study the morphology of the coarse phase particles present in the base material and in different regions of the welds. These results were correlated with the microhardness contours plotted across the weld cross section.

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Temperature evolution, microstructure, and properties of friction stir welded ultra-thick 6082 aluminum alloy joints

Cited by 30 publications

References 26 publications

Friction Stir Spot Welding of Different Thickness Sheets of Aluminum Alloy AA6082-T6

Friction Stir Spot Welding of Different Thickness Sheets of Aluminum Alloy AA6082-T6

Welding parameters optimization during plunging and dwelling phase of FSW 2219 aluminum alloy thick plate

The Effect of Tool Design on the Friction Stir Welding of Thick Aluminum Alloy AA6082-T651 Extruded Flats

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