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Influence of current pulsation on solidification parameters during micro-plasma arc welding of thin sheet Alloy 718

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Abstract

In the present work, the influence of current pulsation on microstructural morphology and mechanical properties of micro-plasma arc welded of 0.7-mm thick Alloy 718 is investigated. The pulsation of current improves the solidification morphology as compared to continuous mode. The effect of peak current, duty cycle, and pulse frequency on cooling rate, weld morphology, and mechanical properties are reported herein. The calculated solidification parameters from the 3D finite element-based heat transfer model are used to predict the solidification behavior of the weld zone. The weld joint mechanical properties are found inferior to the base material due to the presence of intermetallic phases. Current pulsation with optimum heat input in micro-plasma arc welding shows the improvement in the weld mechanical properties. The average heat input reduced by current pulsation, leads to a high cooling rate, and results in fine microstructure and lower segregation of Nb in the interdendritic region. Lower segregation hinders the formation of deleterious Laves phase and improved the mechanical properties of the micro-plasma arc welded Alloy 718.

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Acknowledgements

The authors gratefully acknowledge the experimental facility provided by the Department of Mechanical Engineering, Central Workshop, and Central Instrument Facility (CIF) of IIT Guwahati, Assam, India.

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  1. Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam, India

    A. K. Sahu & S. Bag

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Sahu, A.K., Bag, S. Influence of current pulsation on solidification parameters during micro-plasma arc welding of thin sheet Alloy 718. Weld World 65, 2403–2419 (2021). https://doi.org/10.1007/s40194-021-01191-3

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