Parametric optimization and microstructural study of IS 2062 mild steel weld joints by submerged arc welding with Application of TiO2 nanoparticle inclusions
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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 process is an arc welding process in which arc generates under the blanket of granular flux by which molten metal is isolated from the surrounding so that it is not react with the surrounding as result of that the quality of weld bead improve. In this welding, high heat generates during the process by which the rate of melting of electrode increase as the result of that high liquid metal deposited at the weld joint. With these advantages, some disadvantages associated with high heat generation such as thermal cycle and residual stress, it reduces the quality of weld bead. Many researchers have worked on SAW to improve the quality of weld joint such as modification of process and optimization of process parameters. But there was not any work reported on the parametric optimization of SAW process with TiO2 nanoparticles. Therefore in this study, parametric optimization of SAW process with TiO2 nanoparticles are done. Welding current, arc voltage, welding speed and height of TiO2 nanopowder in the groove were process parameters while ultimate tensile strength, impact toughness and depth of penetration were selected as responses. Experiments were carried out according to Taguchi's L9 orthogonal array (OA) and Taguchi analysis was used in optimization. Analysis of variance (ANOVA) was used to determine the effects of each factor on quality of weld joint. It was found that welding current affects the quality of weld joint at most. SEM (scanning electron microscope) and metallographic microscope were used to observe the effect of TiO2 nanoparticles on the microstructure of the weld joint and it was found with the use of TiO2 nanoparticles, the acicular ferrites structure was formed in the weld zone which increases the impact toughness.