Volume 59, Issue 333, September - December 2023

Influence of weld joint design on mechanical and corrosion properties of welded dissimilar metals

Isiaka Oluwole Oladele^1,2, Samuel Olumide Falana^1♦, Wasiu Agboladuro Alatishe^1,3, Linus Nnubuike Onuh^1,4, Samson Oluwagbenga Adelani^1,5, Oluwatosin Johnson Ajala¹

¹Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, PMB 704, Nigeria
²Centre for Nanomechanics and Tribocorrosion, School of Metallurgy, Chemical and Mining Engineering, University of Johannesburg, Johannesburg, South Africa
³Department of Material Science and Engineering, Katholieke Universiteit Leuven, Belgium
⁴Faculty of Materials and Chemical Engineering, University of Miskolc, Miskolc, Egyetem ut 1, 3515 Hungary, Budapest
⁵Materials Science and Engineering Program, University of Colorado Boulder, 80303, Colorado, USA

^♦Corresponding author
Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, PMB 704, Nigeria

ABSTRACT

This research study makes fundamental observations about dissimilar metalwelded joints, which combine mild steel and aluminum alloy plates, both 6 mm thick. We joined this metal using the shielded metal arc welding (SMAW) process with E308L-16 as the filler metal. We conducted welding on prepared double-V and butt joints and assessed mechanical properties through tensile, impact, and hardness tests. We examined microstructural characteristics using an optical microscope. To investigate the corrosion behavior, we immersed the welded joint in a 3.5 wt% NaCl solution and analyzed it using the potentiodynamic polarization electrochemical method. The results showed that dissimilar weld joints in the double-V configuration outperformed butt joints in tensile and hardness properties. Moreover, the double-V joint displayed more excellent thermodynamic stability in the 3.5 wt% NaCl solution compared to the commonly used butt joint. Consequently, the double-V joint design is the most suitable choice for achieving optimal mechanical and corrosion characteristics in these dissimilar weld joints for engineering applications.

Keywords: Butt joint, Double-V joint, shielded metal arc welding, dissimilar metals, mild steel, and aluminum

Discovery, 2023, 59, e122d1378

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DOI: https://doi.org/10.54905/disssi.v59i333.e122d1378

Published: 21 November 2023