Effect of Heat Input on Microstructure and Mechanical Properties of Automated Tungsten Inert Gas-Welded Dissimilar AA6061-T6 and AA7075-T6 Joints

Reyaz, Md Saquib Bin; Sinha, Amar Nath

doi:10.1007/s11665-023-09026-6

Cited by 8 publications

(2 citation statements)

References 64 publications

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“…Certain defects, including incomplete fusion and porosity, may be present in the welded joint during TIG welding. 9 FSP has the capability to effectively mitigate or eradicate these defects through the process of material redistribution and consolidation. Improved material integrity can lead to enhanced wear resistance.…”

Section: Parametric Effect On Wear Rate (Wr)mentioning

confidence: 99%

“…Conventional fusion welding causes the fusion zone to melt and then solidify, resulting in the formation of brittle phases, solidification cracks, and high residual stresses. [7][8][9] These factors negatively impact the hardness, strength, and ductility of the joint. To overcome these difficulties, friction stir processing (FSP) technique is employed on fusion welds up to specific depth to minimize the fusion weld defects and to refine the grain morphology and enhance the mechanical features.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the influence of FSP parameters on TIG welded dissimilar aluminum joints using RSM and desirability function approach

Bin Reyaz,

Sinha

2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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The present study aimed to explore the cumulative influence of friction stir processing (FSP) parameters, viz., tool spindle speed, traverse speed, and tool tilt angle, on the ultimate tensile strength (TS), ultimate flexural strength (FS), microhardness (MH), and wear rate (WR) of tungsten inert gas (TIG) welded dissimilar AA6061-T6 and AA7075-T6 alloy joints. A face-cantered central composite design (FCCCD) of response surface methodology (RSM) was adopted to design the experiments. Analysis of variance (ANOVA) was employed to identify the significant factors and interaction effects. Multi-response optimization was performed using the desirability function approach to identify parameters that maximize TS, FS, and MH and minimize WR. A confirmation study under optimal conditions were also carried out. FSP significantly improved the TIG joint properties by producing more homogeneous and refined grains (average grain size of 7.75 µm) without any weld defects. The TS, FS, and MH of TIG welds have increased by 66.87%, 61.95%, and 69.01%, respectively, while the WR decreased by 37.87% after FSP. The fractography revealed that TIG welds lead to a brittle failure mode, and the FSP + TIG welds showed a ductile failure mode. The tool spindle speed was the most influential factor affecting joint properties. With increased spindle speed, the TS, FS, and MH of the joint increased, while the WR decreased. At a spindle speed of 1300 rpm, a traverse speed of 50.75 mm/min, and a tilt angle of 1.76°, the optimum TS of 271.89 MPa, the FS of 298.03 MPa, the MH of 122.23 HV, and the WR of 77.48 µm were observed.

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Section: Parametric Effect On Wear Rate (Wr)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%