Parametric optimization of submerged Arc Welding for IS 10748 mild steel using Jaya algorithm
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Date
2021-03
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Submerged Arc Welding (SAW) is an important welding used in industries. It is used in evaporator casing, heat exchanger, and pipeline industries as the quality of weld bead obtained from SAW is high but due to high heat generation, the process consists of thermal cycles, which induces residual stress and degrades the quality of the weld joint. A lot of work on various types of metals to improve its quality has been done, but no work was done on Mild steel IS 10748 grade 5. In this study, Submerged arc welding was carried out taking Mild steel IS 10748 grade 5 as the base metal and process parameters were optimized to increase the quality of weld joint. In this study, three control process parameters viz. welding current, arc voltage and welding speed were taken. The responses of weld joint such as tensile strength, hardness and depth of penetration have been taken in this study. Experiments were carried out according to Taguchi's L9 orthogonal array (OA) and the experimental results were optimized by 'Jaya' algorithm and Taguchi analysis. The results obtained by Jaya algorithm were compared with the Taguchi analysis. As a result, it was found that the "Jaya" algorithm is an efficient algorithm. Analysis of Variance (ANOVA) was used to determine the effects of process parameters on the output responses, and the results showed that welding current is the most important influencing factor which affects the quality of weld joint and output responses such as Tensile strength, hardness and depth of penetration.
From the results, it was concluded that:
1) Maximum Tensile strength was found at welding current of 550A, arc voltage of
32V and welding speed of 26 m/hr.
2) Maximum Hardness was found at welding current of 450A, arc voltage of 24V and
welding speed of 34 m/hr.
3) Maximum Depth of penetration was found at welding current of 550A, arc voltage
of 24V and welding speed of 26 m/hr.
4) Relative contributing effect of I/P parameters on tensile strength is Welding current
> arc voltage > welding speed
5) Relative contributing effect of I/P parameters on hardness is Welding current > arc
voltage > welding speed
6) Relative contributing effect of I/P parameters on depth of penetration is Welding
current > welding speed > arc voltage
7) The results obtained were validated by conducting confirmation tests.