https://orcid.org/0000-0002-3997-5337
![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
ABSTRACT
The electromagnetic arc constriction technique was implemented to mitigate the heat input related weldability issues in Tungsten Inert Gas (TIG) welding of Alloy 718 particularly solute segregation and substantial laves phase evolution in fusion zone which significantly deteriorates the strength and elongation of welded joints. This paper reports the direct effect of arc constriction current (ACC) on microstructural evolution and tensile properties of Constricted Arc TIG (CA-TIG) welded Alloy 718 joints. ACC is the important parameter which induces the electromagnetic filed and controls the arc constriction characteristics. The basic mechanism responsible for microstructural modification and corresponding influence on the tensile properties of joints is studied both in quantitative and qualitative manner related to the mechanics of electromagnetic arc constriction and correlated to the cooling rate. The joints made by applying ACC of 50 A yielded superior tensile properties. It is correlated to the grain refinement of fusion zone resulting in the evolution of laves phase with finer discrete morphology in interdendritic spacings. Increase in ACC above 50 A causes severe growth of grains in fusion zone and substantial decrement in tensile properties of joints. Beneficial effects of ACC were not perceived at maximum level owing to the high heat input.
Disclosure statement
The authors declare that they have no conflict of interest.
Additional information
Funding
Notes on contributors
Tushar Sonar
Mr. Tushar Sonar is a Research Scholar in the Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, India. He is a recipient of ISRO RESPOND research fellowship from Indian Space Research Organization (ISRO), Department of Space, Government of India. He completed his B.E (Mechanical Engineering) from Pune University in the year 2013 and obtained his M.Tech. (Mechanical Engineering) from Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, India in the year 2016. He has published 07 papers in International peer reviewed Journals and presented 08 papers in International Conferences. He has 3 years of research experience in the area of welding of Nickel-based Superalloys. His research interests include Welding and joining, Additive Manufacturing and Heat Treatment of metals.
Malarvizhi Sudersanan
Dr. S. Malarvizhiis working currently as a Professor in the Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, India. She obtained her PhD from Annamalai University, Chidambaram 2008. She has 24 years of teaching experience and 20 years of research experience. She has published more than 50 research papers in international and national journals Her areas of interest are welding metallurgy and materials science. She has completed various sponsored R&D projects from various funding agencies such as AICTE, UGC, DST, DRDO, CSIR & MEF (as Principal Investigator). She is a recipient of Tamil Nadu Young Women Scientist Award in 2012.
Visvalingam Balasubramanian
Dr. V. Balasubramanian is currently working as Professor & Director of the Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, India. He graduated from Government College of Engineering, Salem, University of Madras in 1989 and obtained his post-graduation from College of Engineering Guindy, Anna University, Chennai in 1992. He obtained his Ph.D. from Indian Institute of Technology Madras (IITM), Chennai in 2000. He has 28 years of teaching experience and 25 years of research experience. He has published more than 375 research papers in SCOPUS and SCI indexed Journals and supervised 22 Ph.D. scholars. His areas of interest are Materials Joining, Surface Engineering and Nanomaterials. He has completed 25 R&D projects worth of Rs. 10.00 crores funded by various funding agencies such as DST, DRDO, UGC, AICTE, DAE NRB & ARDB, Ministry of Environment & Forest.