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Arc characteristic evaluation of the double-electrode GTAW process using high current values

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Abstract

This work presents new research results from double-electrode gas tungsten arc welding, a process variant that was developed with the aim of improving productivity and welding speed. A welding torch specially constructed for research was used with total current in the range of 200–600 A. Tests using a high-speed camera were conducted in order to characterize the arc morphology at different distances between the electrodes. It could be seen that the morphology of the arc and the voltage drop in each electrode change significantly with the increase in the welding speed, especially when there is a larger clearance distance between electrodes. The resulting arc presented bigger asymmetry as the welding speed was increased. Bead-on-plate tests were performed in order to evaluate their susceptibility to humping defects. The results showed that in comparison with the conventional GTAW, the double-electrode process enables a considerable increase in the maximum speed, without defects—taking into consideration the total applied current. This shows that this new process has great potential for expanding the range of gas tungsten arc welding in high-productivity welding applications.

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Funding

The authors gratefully acknowledge the financial support (scholarship) of CAPES (Brazilian Federal Agency for Support and Evaluation of Graduate Education) and the CNPq (National Council of Technological and Scientific Development).

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Authors and Affiliations

  1. Mechanical Engineering Department, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina, 88040-900, Brazil

    Mateus Barancelli Schwedersky, Régis Henrique Gonçalves e Silva & Jair Carlos Dutra

  2. Welding and Joining Institute (ISF), RWTH Aachen University, Pontstraße 49, 52062, Aachen, Germany

    Uwe Reisgen & Konrad Willms

Authors
  1. Mateus Barancelli Schwedersky
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  2. Régis Henrique Gonçalves e Silva
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  3. Jair Carlos Dutra
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  4. Uwe Reisgen
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  5. Konrad Willms
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Correspondence to Mateus Barancelli Schwedersky.

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Schwedersky, M.B., Gonçalves e Silva, R.H., Dutra, J.C. et al. Arc characteristic evaluation of the double-electrode GTAW process using high current values. Int J Adv Manuf Technol 98, 929–936 (2018). https://doi.org/10.1007/s00170-018-2344-8

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  • DOI: https://doi.org/10.1007/s00170-018-2344-8

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