Title: Comparative studies on GTA and PCGTA weldments of AISI 4140 and AISI 316 dissimilar metals

Authors: Madduru Phanindra Reddy; M. Mohan Prashanth; A. Aldrin Sam William; M. Arivarasu; K. Devendranath Ramkumar; N. Arivazhagan; S. Narayanan

Addresses: School of Mechanical & Building Sciences, VIT University, Vellore, Tamil Nadu 632014, India ' School of Mechanical & Building Sciences, VIT University, Vellore, Tamil Nadu 632014, India ' School of Mechanical & Building Sciences, VIT University, Vellore, Tamil Nadu 632014, India ' School of Mechanical & Building Sciences, VIT University, Vellore, Tamil Nadu 632014, India ' School of Mechanical & Building Sciences, VIT University, Vellore, Tamil Nadu 632014, India ' School of Mechanical & Building Sciences, VIT University, Vellore, Tamil Nadu 632014, India ' School of Mechanical & Building Sciences, VIT University, Vellore, Tamil Nadu 632014, India

Abstract: In this study, an attempt has been made to investigate the weldability, mechanical properties of dissimilar weldments of AISI 4140 and AISI 316. These dissimilar metals were welded using gas tungsten arc welding (GTAW) and Pulsed Current GTAW (PCGTAW) employing ER309L filler wire. It was observed from the tensile test results that the fracture was occurred at the parent metal of AISI 316 in all the trials for both the weldments. On examining the SEM fractographs, the mode of fracture was found to be ductile in nature. In addition, the scanning electron microscopy and electron dispersive X-ray spectroscopy (SEM/EDS) analysis was performed at various zones of the as-welded samples of AISI 4140 and AISI 316 to reveal the structure-property relationships.

Keywords: DMW; dissimilar metal welding; gas tungsten arc welding; pulsed current GTAW; PCGTAW; weldability; AISI 316; AISI 4140; microstructure; martensite formation; mechanical characterisation; dissimilar metals; tensile testing; ductile fracture.

DOI: 10.1504/IJMMP.2013.059477

International Journal of Microstructure and Materials Properties, 2013 Vol.8 No.6, pp.413 - 424

Published online: 23 Feb 2014 *

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