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Impact of process parameters of resistance spot welding on mechanical properties and micro hardness of stainless steel 304 weldments

Raman Kumar (Department of Mechanical Engineering, Chandigarh University, Mohali, India)
Jasgurpreet Singh Chohan (Department of Mechanical Engineering, Chandigarh University, Mohali, India)
Rohit Goyal (Department of Mechanical Engineering, Chandigarh University, Mohali, India)
Piyush Chauhan (Department of Mechanical Engineering, Chandigarh University, Mohali, India)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 13 May 2020

Issue publication date: 10 May 2021

316

Abstract

Purpose

Resistance spot welding (RSW) is an essential process in the automobile sector to join the components. The steel is the principal material utilized in car generation because of its high obstruction against erosion, toughness, ease of support and its recuperation potential. Due to this, it was planned to study the mechanical properties, hardness and microstructure characteristics of RSW of Stainless steel 304.

Design/methodology/approach

In the present research, RSW of 304 stainless steel plates with 1 mm thickness and effect of current intensity, welding time, electrode pressure and holding time on nugget diameter, tensile strength microhardness and microstructure of the joints was investigated. The specimens were prepared according to the dimensions of 30 × 100 mm with 30 mm overlaps joint through the RSW machine. The tensile test of the specimen was carried out on a universal testing machine and microhardness of specimens measured using Vickers’s hardness tester. Taguchi L16 orthogonal array was used to scrutinize the significant parameters for each output.

Findings

It has been observed that the tensile strength of the specimen is affected by the current intensity and nugget diameter, and the weld time has a significant effect on the tensile strength. Microhardness is highly influenced by electrode pressure and holding time, as the increase in both these parameters resulted in the increase of microhardness. This is due to rapid cooling, which is done by the cooling water flowing through the copper electrodes.

Originality/value

This study was carried out using a copper electrode with a flat face with selected parameters and response factors. The study can be useful for researchers working on optimization of welding parameters on stainless steel.

Keywords

Citation

Kumar, R., Chohan, J.S., Goyal, R. and Chauhan, P. (2021), "Impact of process parameters of resistance spot welding on mechanical properties and micro hardness of stainless steel 304 weldments", International Journal of Structural Integrity, Vol. 12 No. 3, pp. 366-377. https://doi.org/10.1108/IJSI-03-2020-0031

Publisher

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Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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