Title: Implementation of TOPSIS optimisation technique in comparative analysis of conventional TIG and activated TIG welding of stainless steel 304L

Authors: Vaibhav J. Sutar; Baliram R. Jadhav

Addresses: Rajarambapu Institute of Technology, Rajaramnagar, Islampur, 415414, Maharashtra, India ' Rajarambapu Institute of Technology, Rajaramnagar, Islampur, 415414, Maharashtra, India

Abstract: The activated tungsten inert gas (TIG) welding mainly focuses on increasing depth of penetration, reducing width of weld, increase speed of welding and improve weld quality. The objective of this experimental work is to find optimal set of process parameters that achieve higher tensile strength, hardness and depth of penetration. The process parameters selected for experimental work were welding current, gas flow rate and root gap. The design of experiment was carried out using central composite design of response surface methodology. Silicon dioxide activated flux powder was used along with acetone for activated TIG welding process. For experimentation, austenitic stainless steel grade of 304L was used as parent material also the filler material was having same composition. The ANOVA was carried out determine significance of different process parameters on response factors. Further comparative analysis was presented with help of graphs. The TOPSIS optimisation approach was used to optimise the factors.

Keywords: tungsten inert gas welding; tensile strength; hardness; response surface methodology; RSM; TOPSIS optimisation technique.

DOI: 10.1504/IJMATEI.2021.10039980

International Journal of Materials Engineering Innovation, 2021 Vol.12 No.3, pp.188 - 206

Received: 26 Jul 2020
Accepted: 13 Nov 2020

Published online: 09 Aug 2021 *

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