Effect of Pulse Frequency on Microstructural and Corrosion Properties of Inconel 718 Gas Tungsten Arc Weldments

  • N. Anbarasan
  • S. JeromeEmail author
  • Gandamalla Suresh
  • R. Oyyaravelu
Technical Paper


A study has been carried out to understand the effect of pulse frequencies on the formation of laves phase, the microstructural and corrosion properties of Inconel 718. Bead on welds was made by using gas tungsten arc welding (GTAW) in pulsed mode at different frequencies such as 2, 4, 6, 8 and 10 Hz. Varying frequencies exhibit significant changes in weld surface ripples. Microstructural analysis revealed that the welds at 2, 4 and 6 Hz showed both columnar and equiaxed dendrite structure, while at 8 and 10 Hz, the welds predominantly had equiaxed dendrites. Scanning electron microscopy results showed a reduction in continuous laves phase with the increase in pulsing frequency. Corrosion studies confirmed that the pitting resistance was increased at a higher frequency due to the reduction in laves phase in welds.


Corrosion Frequency Laves Ripples 



The authors are grateful to the National Institute of Technology, Tiruchirappalli, India, and Vellore Institute of Technology, India, for supporting this research work.


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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  • N. Anbarasan
    • 1
  • S. Jerome
    • 1
    Email author
  • Gandamalla Suresh
    • 1
  • R. Oyyaravelu
    • 2
  1. 1.Department of Metallurgical and Materials EngineeringNational Institute of Technology TiruchirappalliTiruchirappalliIndia
  2. 2.School of Mechanical EngineeringVellore Institute of TechnologyVelloreIndia

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