Effect of Nature of Flux and Flux Gap on the Depth-to-Width Ratio in Flux-Bounded TIG Welding of AA6061: Experiments and Numerical Simulations

  • N. NeethuEmail author
  • Rahul Goud Togita
  • P. Neelima
  • P. Chakravarthy
  • S. V. S. Narayana Murty
  • Manoj T. Nair
Technical Paper


Flux-bounded tungsten inert gas welding is a variant of activated tungsten inert gas welding wherein activating flux is applied on the weld surface with a narrow flux gap along the line of weld. In this study, bead-on-plate welds were performed with flux gaps of 2, 3, 4, 5 and 6 mm using the fluxes silicon dioxide, titanium dioxide and calcium fluoride. The weld bead profiles were obtained using a stereomicroscope from which the depth-to-width ratios (DWRs) were calculated and compared with the DWR of a tungsten-inert-gas-welded plate. The reasons for differences in DWR were explained using the mechanisms involved and the captured images of the welding arc profile. The microstructure of the weld beads revealed no entrapment of flux particles. The increase in the DWR in the presence of activating flux was also substantiated using a numerical simulation model.


FBTIG welding Depth of penetration Activating flux Marangoni convection currents Numerical simulation 



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Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  • N. Neethu
    • 1
    Email author
  • Rahul Goud Togita
    • 1
  • P. Neelima
    • 2
  • P. Chakravarthy
    • 1
  • S. V. S. Narayana Murty
    • 3
  • Manoj T. Nair
    • 1
  1. 1.Department of Aerospace EngineeringIndian Institute of Space Science and TechnologyTrivandrumIndia
  2. 2.Department of ChemistryIndian Institute of Space Science and TechnologyTrivandrumIndia
  3. 3.Materials and Metallurgy GroupVikram Sarabhai Space CentreTrivandrumIndia

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