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Spectral diagnostics of a pulsed gas metal arc welding process

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Abstract

Introduction

Plasma properties in the pulsed arc determine the welding process. They will have influence on the consumable electrode and the weld pool. For that reason, the accurate gauging of the plasma properties is of special importance for deeper understanding of the processes.

Material and methods

Using spectroscopic methods and plasma physical diagnostics, the temperature in the arc during the high-current phase of a pulsed gas metal arc welding process is determined. With this knowledge and composition calculation, the electrical conductivity is also derived. A one-drop-per-pulse process with workpiece and wire made of steel and an argon-dominated shielding gas is considered. Boltzmann plots applied to iron lines, broadening of argon lines or the emission coefficient of optically thin lines are used for the determination of plasma parameters.

Results

Intersections of the arc at different distances from the workpiece are analysed for different times during the pulse. It is observed that the brighter central part of such an arc has a minimum in the temperature profile and contains a high amount of iron.

Conclusion

Consequently, the central part of the arc has lower electrical conductivity than the outer part dominated by the shielding gas argon.

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Acknowledgments

This work was supported by DFG UH106/3-1 and AIF 15649/BG3. Special thanks to Martin Wendt and Margarita Baeva (both INP-Greifswald) for calculations of composition and data sets of electrical conductivity.

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Authors and Affiliations

  1. Leibniz Institute for Plasma Science and Technology, 17489, Greifswald, Germany

    Gregor Gött, Dirk Uhrlandt, Ruslan Kozakov & Heinz Schöpp

Authors
  1. Gregor Gött
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  2. Dirk Uhrlandt
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  3. Ruslan Kozakov
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  4. Heinz Schöpp
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Corresponding author

Correspondence to Heinz Schöpp.

Additional information

Doc. IIW-2334, recommended for publication by Study Group SG-212 “The Physics of Welding”

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Gött, G., Uhrlandt, D., Kozakov, R. et al. Spectral diagnostics of a pulsed gas metal arc welding process. Weld World 57, 215–221 (2013). https://doi.org/10.1007/s40194-012-0016-0

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  • DOI: https://doi.org/10.1007/s40194-012-0016-0

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