Microstructures and mechanical properties of friction stir spot welded Al 6061 alloy lap joint welded in air and water

Shekhawat, Ravindra S.; Nadakuduru, Vijay N.; Nagumothu, Kishore B.

doi:10.1016/j.matpr.2020.06.065

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…The analysis of variance (ANOVA) results shows that increasing tilt angle, increasing tool rotational speed, increasing dwell time, and cylindrical threaded pin profile lead to higher joint strength. A similar study was conducted by Shen et al 4 for AA6061-T4 aluminum alloy and Shekhawat et al 5 for AA6061 aluminum alloy. The rotational speed played a crucial role in joint strength.…”

Section: Introductionsupporting

confidence: 54%

Experimental investigation of friction stir spot welding of polymer-aluminum alloy weldments

Joudaki

Safari

Joodaki

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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The friction stir spot welding (FSSW) process is one of the main solid-state joining methods used widely for welding different materials and dissimilar metals. In this article, the welding of Polytetrafluoroethylene (PTFE) and aluminum alloy sheets by the FSSW process will be investigated experimentally. The joining of polymer (PTFE) and metal (AA1050 aluminum alloy) was done successfully. The effect of process parameters including tool rotational speed, penetration depth, initial holding time, dwell time, and tool shoulder diameter on the joint strength and elongation of the weldments will be studied using response surface methodology (RSM). The joint strength was increased by creating a threaded hole in the aluminum sheet. A mechanical lock was created between the softened PTFE and the edge of the threaded hole. The shear-tensile tests have been carried out for 32 designed experiments. The results show that the joint strength increased by increasing the initial holding time due to the better wettability of PTFE and aluminum sheet. The joint strength increased by increasing the tool rotational speed and tool diameter (better pouring of the hole and formation of the mechanical lock). Two different fracture modes have been observed in the samples: (1) fracture in the peripheral area of the joint (partial interfacial fracture mode) and (2) fracture in the mechanically locked area (pull-out mode with tearing).

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Section: Introductionsupporting

confidence: 54%

Experimental investigation of friction stir spot welding of polymer-aluminum alloy weldments

Joudaki

Safari

Joodaki

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Moreover, the strength of the weld joints produced by a cylindrical pin is higher than that of a step pin. The effect of tool rotating speed (700, 900, and 1100 rpm) on the microstructures and mechanical characteristics of the AA6061 FSSW joints welded in air and water was also demonstrated by Shekhawat et al [20]. They found that the load-bearing capacity improved and also a slight increase in hardness when the rotational speed increases from 700 to 1100 rpm, irrespective of the welding medium.…”

Section: Introductionmentioning

confidence: 60%

Effect of Pin Geometry and Tool Rotational Speed on Microstructure and Mechanical Properties of Friction Stir Spot Welded Joints in AA2024-O Aluminum Alloy

2021

IJE

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In the present study, the effects of pin geometry and tool rotational speed on the microstructure and mechanical characteristics of the AA2024-O friction stir spot welding (FSSW) joint were investigated.Two different types of pin geometries, namely cylindrical and step pins, and three different rotational speeds of 900, 1400, and 1800 rpm were used in the friction stir spot welding joint. The microstructure observation, hardness measurements, and shear tests were conducted. Results showed that both pin geometry and rotational speed gave a remarkable effect on the microstructure and maximum shear load of the weld joints. For both pin geometries, the hook height and width of the fully bonded region (FBR) increased by increasing the rotational speed. The weld joint produced by a cylindrical pin exhibits higher values in the hook height and width of the FBR than using a step pin. Furthermore, the highest value in a maximum shear load was obtained at a rotation speed of 1400 rpm for both cylindrical and step pins. Another finding is that the maximum shear loads of FSSW joints produced with a cylindrical pin are higher than that made using a step pin.

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Friction Stir Spot Welding-Process and Weld Properties: A Review

Sharma¹,

Tripathi

Upadhyay

et al. 2021

J. Inst. Eng. India Ser. D

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Microstructures and mechanical properties of friction stir spot welded Al 6061 alloy lap joint welded in air and water

Cited by 6 publications

References 19 publications

Experimental investigation of friction stir spot welding of polymer-aluminum alloy weldments

Experimental investigation of friction stir spot welding of polymer-aluminum alloy weldments

Effect of Pin Geometry and Tool Rotational Speed on Microstructure and Mechanical Properties of Friction Stir Spot Welded Joints in AA2024-O Aluminum Alloy

Friction Stir Spot Welding-Process and Weld Properties: A Review

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