Title: Numerical and experimental studies of thin super duplex stainless steel GTAW joints

Authors: Sujeet Kumar; K.E.K. Vimal

Addresses: Department of Mechanical Engineering, National Institute of Technology, Patna-800 005, India ' Department of Mechanical Engineering, National Institute of Technology, Patna-800 005, India

Abstract: Super duplex stainless steel (SDSS) thin sheets are welded together in this study by adjusting the welding speed (250-450 mm/min) and welding current (65-75 A). On 1.6 mm thin sheets, nine tests are carried out. Based on these data, an ideal parameter for fabricating the butt joint with a heat input of 0.216 kJ/mm is chosen. The quality of the butt joint is then assessed using microstructural and mechanical tests. Simultaneously, the mechanical properties are modelled using the ABAQUS 6.14 software. The presence of Widmanstatten austenite and intragranular precipitates coarsens the microstructure of the weld zone. GTAW welded joints have a joint efficiency of 91.7%. The welded joint has 8.2% less tensile strength than the base metal. The welded samples passed the three-point bending test without fail. The computational and experimental results for the tensile and three-point bending tests are comparable.

Keywords: three-point bending; super duplex stainless steel; SDSS; welding current; butt joint tensile test; welded joint.

DOI: 10.1504/IJMATEI.2024.138606

International Journal of Materials Engineering Innovation, 2024 Vol.15 No.2, pp.157 - 171

Received: 07 Oct 2022
Accepted: 23 Dec 2022
Published online: 15 May 2024 *

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