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    Volume 47, Issue 6 (November 2019)

    Special Issue Paper

    Detection of an Electromotive Force during Resistance Spot Welding and Its Correlation with Nugget Growth

    (Received 5 June 2018; accepted 20 November 2018)

    Published Online: 2019

    CODEN: JTEVAB

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    Abstract

    This article presents a report on an electromotive force that appears in the electromagnetically open circuit during resistance spot welding. We measured the potential drop between the Cu electrodes during the supply of an alternating current while keeping the area surrounding the electrical lines available for the potential drop measurement. We detected a unique electromotive force in the opposite direction to the back electromotive force induced by the change in the current. Here, we demonstrate that the change in the electromotive force is closely associated with nugget growth and the generation of spatter during welding. Based on the temperature measurement around the Cu electrode, we observed a temperature ripple during the welding process and consider this as the driving force behind the electromotive force.

    Author Information:

    Tohmyoh, Hironori
    Department of Finemechanics, Tohoku University, Sendai,

    Hasegawa, Yuta
    Toyota Motor East Japan, Iwate,

    Matsui, Yoichi
    Toyota Motor East Japan, Iwate,


    Stock #: JTE20180384

    ISSN:0090-3973

    DOI: 10.1520/JTE20180384

    Author
    Title Detection of an Electromotive Force during Resistance Spot Welding and Its Correlation with Nugget Growth
    Symposium ,
    Committee A01