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Direct observation and numerical simulation of molten metal and molten slag behavior in electroslag welding process

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Abstract

The electroslag welding process involves high heat inputs and high deposition rates. In this process, the weld region is surrounded by the base metal and/or devices; therefore, it is difficult to observe the phenomenon and understand the mechanism of weld formation. In this study, we directly observe the molten region formed during the process and construct a numerical model to discuss the phenomena especially the construction of the molten region, the flow field of the molten region, and the metal transfer. A device for direct observation was constructed, and the molten region was observed. The molten slag flows from the wire tip to the molten metal interface, and the direction of flow is changed to the side at the interface. The molten metal flows from the center to the side region at the interface of the slag and metal. The penetration depth is governed by the behavior of the molten metal. In addition, droplet transfer from the wire is observed, and this transfer occurs in the spray or rotating mode. The simulation results indicate a tendency similar to that deduced via direct observations. Thus, the mechanism of penetration can be elucidated more clearly using these tools.

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Authors and Affiliations

  1. Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, Japan

    Y. Ogino, S. Fukumoto & S. Asai

  2. Kawada Industries, Inc., 17 Nishiminato-machi Tadotsucho, Nakatado-gun, Kagawa, Japan

    T. Tsuyama

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  1. Y. Ogino
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  2. S. Fukumoto
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  3. S. Asai
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  4. T. Tsuyama
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Correspondence to Y. Ogino.

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Ogino, Y., Fukumoto, S., Asai, S. et al. Direct observation and numerical simulation of molten metal and molten slag behavior in electroslag welding process. Weld World 64, 1897–1904 (2020). https://doi.org/10.1007/s40194-020-00969-1

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  • DOI: https://doi.org/10.1007/s40194-020-00969-1

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