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A New Mechanism of Interaction between a Welding Arc Discharge of Reverse-Polarity Direct Current and an Aluminum Surface

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Abstract

The results of a study of aluminum welding by reverse-polarity direct current in a medium of protective gases (argon) at the stage of the binding and formation of the pool of melted metal are presented. It is shown that cathode spots in a current range of 5–50 A and action time of up to 1 s do not clean the cathode film from the aluminum surface but remelt the surface layer. The types of cathode spots that form on the aluminum surface are analyzed. It is shown that evaporation is the main mechanism for the removal of the oxide film. A new mechanism of the interaction between a welding arc discharge an aluminum surface is proposed: the main role in the formation of the welding pool is played by an immobile cathode spot, which, on the one hand, evaporates the oxide film and, on the other, intensely heats the surface layer of the aluminum to the phase transition due to high heat density. After the formation of the welding pool, the immobile cathode spot disappears, followed by the diffusion regime of welding arc burning. The regime is characterized by a uniform distribution of the electric field over the length of the discharge gap with a low potential decrease and occupies almost whole interelectrode gap.

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  1. Additional materials are situated at DOI https://doi.org/10.1134/S0018151X19060063

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Authors and Affiliations

  1. Irkutsk National Research Technical University, 664074, Irkutsk, Russia

    A. E. Balanovskii

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  1. A. E. Balanovskii
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Correspondence to A. E. Balanovskii.

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Translated by A. Nikol’skii

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Balanovskii, A.E. A New Mechanism of Interaction between a Welding Arc Discharge of Reverse-Polarity Direct Current and an Aluminum Surface. High Temp 57, 784–797 (2019). https://doi.org/10.1134/S0018151X19060063

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