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Investigation of process parameters for T-joint aluminum alloy 6061-T6 with nanocomposites material friction stir welding based on the Taguchi method

Document Type : Research Paper

Authors

Department of Automated Manufacturing Engineering, Al-Khwarizmi College of Engineering, University of Baghdad, Baghdad, Iraq,

10.22061/jcarme.2020.4314.1522

Abstract

Surface layer in many engineering applications is strengthened by ceramic grains where the main parts have higher structure toughness of than the original material. This paper presents the effect of four process parameters that have taken into consideration using Taguchi technique based on L9 orthogonal array. These parameters are;1) transverse speed, 2) type of nano-powders, 3) rotational speed, and 4) groove’s depth friction stir welding T-joints aluminum alloy 6061-T6. This work combines between welding T-joint sections and creating MMNCs in welding region simultaneously.The predicted optimum parameters and their percentage of contribution were estimated, utilizing the analysis of variance and signal to noise ratio techniques, depending on tensile test in skin and stringers direction, and hardness test of the joint. Optical microscope and scanning electron microscope (SEM) analysis were used to verify the microstructure and dispersion of nano-powders in welding joint. The best ultimate tensile stress (UTSskin) was equal to (177MPa) for the skin welded part, were obtained at the optimal conditions of 1550rpm rotational speed, 15mm/min transverse speed, Al2O3 type of powder and 1mm groove’s depth. SEM micrographic for metal matrix nanocomposite of all nine experiments revealed that the nano-particles are irregular dispersed in nugget zone due to one pass. The rotational speeds of 960rpm, the transverse speed of 15mm/min, type of powder TiO2, and groove’s depth of 1.5mm, give the greatest hardness value of 80HV in nugget zone. Analysis of variance showed that the groove’s depth is the most significant parameter in this investigation.

Graphical Abstract

Investigation of process parameters for T-joint aluminum alloy 6061-T6 with nanocomposites material friction stir welding based on the Taguchi method

Keywords

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References

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Journal of Computational & Applied Research in Mechanical Engineering (JCARME)

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