Optimization of the Ductile Properties of an Arc Welded Plate Based on the Yield Strength, Elongation and Modulus of Elasticity.


Department of Mechanical & Production Engineering, Faculty of Engineering, Delta State University. Nigeria.


As a means of controlling the setback associated with the ductile properties of the welded joint, the optimal ductile properties of a mild steel weld were studied based on empirical data generated using the metal inert gas (MIG) welding process with specific references to the yield strength, percentage elongation, poisson ratio and modulus of elasticity using the Response Surface Methodology (RSM) and Genetic Algorithm (GA). The results judging from the remarkable quality of the ductility of the weld reveals the adequacy of the yield strength, poisson ratio, and percentage elongation as key determinant in ascertaining the ductility of a weld as against the tensile strength which have been widely used in previous studies. Further analysis to determine the optimal ductile properties using the optimization techniques generated two different results which were further compared by means of a confirmatory test. The GA results recorded a more accurate optimal responses compared to the RSM having a yield strength of 270.28N/mm2, 31.01% percentage elongation, 0.359 poisson ratio, and modulus of elasticity of 1660.3N/mm2. The results not withstanding their differences reveals that manufacturers can obtain the optimal ductile weld properties using the GA and RSM techniques if the right combination of process parameters is made.

Graphical Abstract

Optimization of the Ductile Properties of an Arc Welded Plate Based on the Yield Strength, Elongation and Modulus of Elasticity.


  • The production of strong and durable connections between materials has been made possible by means of the different welding processes. However, the output of the different joining processes is complicated by certain drawbacks such as poor mechanical and ductile properties, which invariably leads to failure of mechanical components, and increased cost of production etc. This study evaluates the significant effect of response parameters such as yield strength, percentage elongation and modulus of elasticity along with the application of two different optimization techniques such as the response surface methodology (RSM) and genetic algorithm (GA)in determining the optimal ductile properties of a gas metal arc welded plate.
  • From the results obtained, the significant input of the bevel angle in designing the weld joint was established. Also from the results obtained, the uniqueness of both techniques as well as the suitability of the GA techniques over the RSM in determining near optimal parameters of the weld responses (yield strength, percentage elongation, Poisson Ratio and modulus of elasticity) was established. However, with the response surface methodology (RSM) the significant contributions and the interactive relationship of model terms were made possible.


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