Indian Journal of Engineering & Materials Sciences

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Investigation of the effective parameters on welding residual stress in GTAW of aluminum cylindrical shell


Affiliations
1 Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran 16758 136, Iran, Islamic Republic of
2 Faculty of Mechanical Engineering , K.N. Toosi University of Technology, Tehran 16765 3381, Iran, Islamic Republic of

The present work aims to study the influence of different geometrical, technological, and material parameters on residual stress in tungsten inert gas butt-welded aluminum cylinder. In order to present a simple analytical model to estimate the welding residual stress, the Taguchi L18 array has been employed with one 6-level factor and four 3-level factors. A 3D coupled thermo-mechanical finite element model considering temperature-dependent material properties has been developed to determine the welding residual stress in all experiments. The numerical model has been validated using the hole-drilling method. Using statistical analysis, the order of factors based on their effect on residual stress has been determined as yield strength, length, thickness, heat input, and finally diameter. The residual stress increases with an increase in yield strength, diameter, and heat input, while decreases with an increase in thickness. Contribution of each parameter on residual stress has been specified using variance analysis; yield strength with 99.6% contribution is the most significant factor, while diameter has insignificant impact. Finally, high accuracy equations have been proposed to calculate the welding residual stress.
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  • Investigation of the effective parameters on welding residual stress in GTAW of aluminum cylindrical shell

Abstract Views: 147  | 

Authors

Yousef Ghaderi Dehkordi
Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran 16758 136, Iran, Islamic Republic of
Ali Pourkamali Anaraki
Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran 16758 136, Iran, Islamic Republic of
Amir Reza Shahani
Faculty of Mechanical Engineering , K.N. Toosi University of Technology, Tehran 16765 3381, Iran, Islamic Republic of

Abstract


The present work aims to study the influence of different geometrical, technological, and material parameters on residual stress in tungsten inert gas butt-welded aluminum cylinder. In order to present a simple analytical model to estimate the welding residual stress, the Taguchi L18 array has been employed with one 6-level factor and four 3-level factors. A 3D coupled thermo-mechanical finite element model considering temperature-dependent material properties has been developed to determine the welding residual stress in all experiments. The numerical model has been validated using the hole-drilling method. Using statistical analysis, the order of factors based on their effect on residual stress has been determined as yield strength, length, thickness, heat input, and finally diameter. The residual stress increases with an increase in yield strength, diameter, and heat input, while decreases with an increase in thickness. Contribution of each parameter on residual stress has been specified using variance analysis; yield strength with 99.6% contribution is the most significant factor, while diameter has insignificant impact. Finally, high accuracy equations have been proposed to calculate the welding residual stress.