Structure and Mechanical Property of Friction-Stir Weld Joint of 2195-T8 Al-Li Alloy Plate

Li, Jinfeng; Chen, Yong-lai; Zhang, Xu-hu; Zheng, Zhoushun

doi:10.1016/s1875-5372(18)30108-5

Cited by 12 publications

(13 citation statements)

References 14 publications

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“…The abnormal fracture phenomenon is more prevalent in the FSW Al-Li alloy joints with thin plates, which is attributed to the strong action from the tool shoulder. Yan et al [8] obtained defect-free joints in 2195-T8 alloy plates with 2 mm thickness, but the joints were fractured at the NZs during tensile tests, and similar results can also be found in some FSW joints of Al-Li alloys with medium thickness [12,14]. Chen et al [21] speculated that the abnormal fracture was related to the 'S' line originating from the fragmented oxide film at the plate butt surface.…”

Section: Introductionmentioning

confidence: 90%

“…One of the remarkable features is that the welding window was significantly narrowed for the FSW of Al-Li alloys, compared to those of other precipitatestrengthened Al alloys. Table 1 summarises the welding parameters and tensile properties of some FSW joints for 2195 and 2198 Al-Li alloys [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Though the tool rotational speed is in a wide range, the most important welding speed related to manufacturing efficiency is limited to a very narrow section.…”

Section: Introductionmentioning

confidence: 99%

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A feasible operational parameter window for enhancement of welding speed in friction stir welding of 2195-T8 Al–Li alloy

Wang

Zhang

et al. 2023

Science and Technology of Welding and Joining

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The improvement of the welding speed becomes extraordinarily difficult for the friction stir welding (FSW) of Al-Li alloys with medium thickness (5-10 mm). In this study, 2195-T8 Al alloy plates with a thickness of 6 mm were subjected to FSW under different welding speeds of 200-800 mm/min with the objective of seeking an optimised welding parameter. The tensile strength of ∼ 422 MPa at a relatively high welding speed of 400 mm/min with a tool rotational speed of 800 rpm was obtained, which reached a comparable level to those of the joints with low welding speeds. The combination of moderate tool rotational speed and moderate welding speed was a feasible optimising direction for FSW of Al-Li alloy with medium thickness.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

A feasible operational parameter window for enhancement of welding speed in friction stir welding of 2195-T8 Al–Li alloy

Wang

Zhang

et al. 2023

Science and Technology of Welding and Joining

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“…As reported widely in the literature, these zones are very susceptible for fracture under tensile and bending forces. 43,44 Additionally, the higher the rotational speed the coarser the microstructure (Figure 13) and the lower the SZ strength.…”

Section: Effects Of Tool Rotational Speedmentioning

confidence: 99%

“…Excessive heating of welding material, although can improve the material coalescence in the SZ, causes to reduction of mechanical properties in the areas besides the SZ (TMAZ/HAZ) due to annealing. [43][44][45]…”

Section: Effects Of Tool Rotational Speedmentioning

confidence: 99%

Material flow modeling for the DSFSW of magnesium alloy

Asadi

Mirzaei

2020

The Journal of Strain Analysis for Engineering Design

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The Coupled Eulerian Lagrangian (CEL) method is utilized to model the double shoulder friction stir welding (DSFSW) of AZ91 magnesium alloy and then the model is verified by the experiments. The effects of tool rotational speed and sheet thickness on temperature and strain distributions as well as the material flow patterns are considered at different steps of the process. The material flow pattern around the tool pin is demonstrated properly and the shoulder driven and pin driven zones are predicted very well. Results show that, the material movement in shoulder driven and pin driven zones is different, while it is from the advancing side (AS) to the retreating side (RS) in the pin driven zone, it is inverse in the shoulder driven zone. Additionally, increase in rotational speed raises the maximum temperature and strain, improves the material movement, expands the SZ width and increases the depth of shoulder driven zone. Furthermore, increase in sheet thickness results in a decrease in maximum temperature and strain as well as the material movement. In the sheets with low thickness due to the effects of two shoulders, the pin driven zone is not distinguishable, however in thicker welding sheets the pin driven zone is obvious by significantly lower strains.

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“…Since FSW could avoid common defects observed in fusion welding caused by melting and solidification [11], Lee et al [12] performed FSW of AA2195 and provided the optimum welding parameters. Li et al [13] studied the precipitate phase in 2195 Al-Li alloy and discovered that the precipitates in the NZ are completely dissolved in FSW. Kookil et al [14] investigated the mechanical properties of AA2195-T8 joint and achieved the maximum welding efficiency of 81%.…”

Section: Introductionmentioning

confidence: 99%

Analysis of heat and mass transfer in ultrasonic vibration-enhanced friction stir welding of 2195 Al–Li alloy

Shi

Chen

et al. 2021

Science and Technology of Welding and Joining

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Ultrasonic vibration (UV)-enhanced friction stir welding (UVeFSW) is used for welding of 2195 Al-Li alloy plates. A model is developed to study the heat and mass transfer in UVeFSW of 2195 Al-Li alloy. It reveals that additional UV in FSW could reduce the heat flux and temperature at the contact interfaces when compared to those in conventional FSW. Although the temperature is slightly decreased with additional UV, the acoustoplastic effect of the UV could reduce the flow stress and viscosity in the shear zone, resulting in an enhanced fluidity of the plastic material with a higher flow velocity. It is demonstrated that the variations of viscosity, strain rate and flow stress around the tool at the same radial distance are more severe at low heat input condition, such as with a low rotation speed or a high welding speed. The model is validated by the experimental data.

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Structure and Mechanical Property of Friction-Stir Weld Joint of 2195-T8 Al-Li Alloy Plate

Cited by 12 publications

References 14 publications

A feasible operational parameter window for enhancement of welding speed in friction stir welding of 2195-T8 Al–Li alloy

A feasible operational parameter window for enhancement of welding speed in friction stir welding of 2195-T8 Al–Li alloy

Material flow modeling for the DSFSW of magnesium alloy

Analysis of heat and mass transfer in ultrasonic vibration-enhanced friction stir welding of 2195 Al–Li alloy

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