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

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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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Acknowledgments

The authors express their sincere gratitude to the Director, Vikram Sarabhai Space Centre (VSSC), ISRO, Thiruvananthapuram, Kerala, for providing the financial support and base material to carry out this investigation through the ISRO RESPOND scheme (Project No. ISRO/RES/3/728/16-17).

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Authors and Affiliations

  1. Department of Manufacturing Engineering, Centre for Materials Joining and Research (CEMAJOR), Annamalai University, Annamalai Nagar, Chidambaram, Tamil Nadu State, 608002, India

    Tushar Sonar, V. Balasubramanian & S. Malarvizhi

  2. Vikram Sarabhai Space Centre (VSSC), ISRO, Thiruvananthapuram, Kerala State, 695022, India

    T. Venkateswaran & D. Sivakumar

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  1. Tushar Sonar
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  2. V. Balasubramanian
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  3. S. Malarvizhi
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  4. T. Venkateswaran
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  5. D. Sivakumar
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Correspondence to V. Balasubramanian.

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Manuscript submitted October 20, 2019.

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Sonar, T., Balasubramanian, V., Malarvizhi, S. et al. Effect of Delta Current and Delta Current Frequency on Microstructure and Tensile Properties of Gas Tungsten Constricted Arc (GTCA)-Welded Inconel 718 Alloy Joints. Metall Mater Trans A 51, 3920–3937 (2020). https://doi.org/10.1007/s11661-020-05853-7

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