Design of experiment study on hardness variations in friction stir welding of AM60 Mg alloy

Richmire, S.; Hall, Kathleen J.; Haghshenas, M.

doi:10.1016/j.jma.2018.07.002

Cited by 32 publications

(12 citation statements)

References 8 publications

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“…Therefore, great efforts have been devoted to improve the joint performance. It was found that welding parameters such as weld speed and rotation rate can control heat input and modify grain size and texture of an FSW joint (Commin et al, 2009;Padmanaban et al, 2010;Yang et al, 2010Yang et al, , 2013Liu et al, 2011;Chowdhury et al, 2013;Hütsch et al, 2014;Pan et al, 2016;Rao et al, 2016;Alireza Askariani et al, 2017;Richmire et al, 2018). So, it is possible to improve the joint strength by varying welding parameters.…”

Section: Ways To Improve the Joint Strengthmentioning

confidence: 99%

Texture Related Inhomogeneous Deformation and Fracture Localization in Friction-Stir-Welded Magnesium Alloys: A Review

et al. 2020

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Friction stir welding (FSW) is a solid-state joining technique, which can avoid surface distortion and grain coarsening, and is very suitable for the joining of magnesium (Mg) alloys. However, a pronounced and inhomogeneous deformation texture was usually formed in the stir zone (SZ) of Mg welds. This has significant effect on the joint strength and fracture behavior of FSW Mg joints. In this review, microstructure and texture evolutions in weld zone (WZ) are analyzed based on the electron backscatter diffraction (EBSD) data. Schmid factor (SF) changes for slip and extension twinning were observed and discussed. The localized plastic deformation and fracture mechanisms of Mg welds are analyzed. In addition, some methods for improving the joint strength of FSW Mg welds are tested. Finally, the research direction of FSW Mg alloys in the future is determined.

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Section: Ways To Improve the Joint Strengthmentioning

confidence: 99%

Texture Related Inhomogeneous Deformation and Fracture Localization in Friction-Stir-Welded Magnesium Alloys: A Review

et al. 2020

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“…The softened & plasticized materials on both sides of the workpieces are stirred around the region of the FSW tool pin (with unique geometrical shape), by the impact of the rotational and translational movements of pin of the tool, which happens along the entire line of travel of the tool pin [14]. Once the pin of the FSW tool is retrieved from the surfaces of the flat metal plates, the plasticized material flows across the metal plates stops, then the cooling of the plasticized material takes place and the welding gets completed successfully [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Development of Thermo Mechanical Model for Prediction of Temperature Diffusion in Different FSW Tool Pin Geometries During Joining of AZ80A Mg Alloys

Babu

Sevvel²,

Kumar³

et al. 2021

J Inorg Organomet Polym

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Heat generated during the friction stir welding (FSW) process is of complex nature and plays a vital role in influencing the quality of the fabricated joints. In this experimental research, an thermo mechanical process model was formulated to estimate the values of peak temperatures generated during the employment of FSW tools with four different pin geometries (namely cylindrical, taper cylindrical, square and triangle) for joining of AZ80A Mg alloy flat plates, to understand their significant role in influencing the size of the grains, their mechanical strength and in the quality of the joints. The peak temperature values of the formulated thermo mechanical process model are found to be consistent with that of the actual experimental results and exhibited relatively very small variation It was observed that the joints fabricated by taper cylindrical pin geometry was found to possess very fine sized grains, due to the generation of ideal peak temperature (ie., 348 0 C which is nearly 81-82% of the melting temperature of AZ80A Workpiece).

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“…However, this innovative and eco-friendly FSW technique features unexplored areas and complexities emerging from the geometry of the employed FSW tool pin, the movement of the molten metal by the stirring force of this unique pin geometry, and the peak temperature generated around the tool pin and on the workpiece surface. Very few researchers have performed investigational experiments [22][23][24][25][26][27][28][29] addressing the above mentioned complexities during the joining of alloys by employing FSW. For example, Padmanaban et al [23] formu-lated a CFD-based statistical model was formulated to anticipate the distribution of the temperature and flow of the molten metal during the welding of Al alloys, namely, AA2024 and AA7075.…”

Section: Introductionmentioning

confidence: 99%

Simulation of heat transfer and analysis of impact of tool pin geometry and tool speed during friction stir welding of AZ80A Mg alloy plates

Babu¹,

Sevvel²,

Kumar³

2020

J Mech Sci Technol

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Peak temperature arising during the joining of metals by friction stir welding (FSW) needs to be investigated along with other process parameters of FSW to understand their inevitable impact on joint quality. This investigational and experimental analysis aims to determine the impact of pin geometry and its rotational speed by formulating thermic mechanical process-based models to anticipate peak temperature and to compare it with actual values. Three distinctive pin geometries rotated at three speeds were used while other parameters were unchanged. The fitness and suitability of the model were verified by comparing the anticipated values with the experimental values. Macrographic and micrographic observations revealed that flawless joints with improved mechanical properties were fabricated at a peak temperature of 616 K (80 % melting temperature) when a taper cylindrical pin with a rotational speed of 818 rpm was employed. In addition, SEM analysis of the fractured specimen confirmed that failure of the defect free weldment occurred in brittle mode, indicating that preferred fusion of grains and their constituents occurred during the joining process. Compared with other solid-state and unconventional welding techniques, such as electron beam welding, laser beam welding, and plasma arc welding, FSW is cheaper and more cost effective and does not require filler material and shielding medium (or gas), strict safety measures due to the absence of molten spatter and toxic fumes, skilled labor, long operation period, and cool down period, thereby boosting production rate and efficiency; moreover, FSW can be employed to fabricate joints in all positions, including horizontal, vertical, and overhead [12][13][14].

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Design of experiment study on hardness variations in friction stir welding of AM60 Mg alloy

Cited by 32 publications

References 8 publications

Texture Related Inhomogeneous Deformation and Fracture Localization in Friction-Stir-Welded Magnesium Alloys: A Review

Texture Related Inhomogeneous Deformation and Fracture Localization in Friction-Stir-Welded Magnesium Alloys: A Review

Development of Thermo Mechanical Model for Prediction of Temperature Diffusion in Different FSW Tool Pin Geometries During Joining of AZ80A Mg Alloys

Simulation of heat transfer and analysis of impact of tool pin geometry and tool speed during friction stir welding of AZ80A Mg alloy plates

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