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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 8/2020

09-06-2020

Effect of Delta Current and Delta Current Frequency on Microstructure and Tensile Properties of Gas Tungsten Constricted Arc (GTCA)-Welded Inconel 718 Alloy Joints

Authors: Tushar Sonar, V. Balasubramanian, S. Malarvizhi, T. Venkateswaran, D. Sivakumar

Published in: Metallurgical and Materials Transactions A | Issue 8/2020

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Abstract

The magnetic arc constriction technique was used to control the heat input-related metallurgical problems such as segregation of Nb and laves phase formation in the weld metal region of gas tungsten arc welding (GTAW) of Inconel 718 alloy. The delta current (arc constriction current) and delta current frequency are the two important parameters in controlling the arc characteristics. The main effect of the delta current and delta current frequency on the microstructural modification and corresponding influence on the tensile properties of a gas tungsten constricted arc (GTCA) welded 2-mm-thick Inconel 718 alloy sheet was investigated systematically and presented in this article. Superior tensile properties were exhibited by the joints made using a delta current of 50 A and delta current frequency of 4 kHz because of the grain refinement in the fusion zone and finer, distinct laves phase formation.
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Metadata
Title
Effect of Delta Current and Delta Current Frequency on Microstructure and Tensile Properties of Gas Tungsten Constricted Arc (GTCA)-Welded Inconel 718 Alloy Joints
Authors
Tushar Sonar
V. Balasubramanian
S. Malarvizhi
T. Venkateswaran
D. Sivakumar
Publication date
09-06-2020
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 8/2020
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-020-05853-7

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