Stabilization of High-Current Buried-Arc Welding Using Large Diameter φ1.6mm Wire by Low-Frequency Modulated Voltage Control

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  • BABA Hayato
    DAIHEN Corporation
  • KOMEN Hisaya
    Magnesium Research Center, Kumamoto University
  • IGARASHI Tomoya
    DAIHEN Corporation
  • KADOTA Keiji
    DAIHEN Welding and Joining Research Alliance Laboratories, Joining and Welding Research Institute Osaka University
  • ERA Tetsuo
    DAIHEN Welding and Joining Research Alliance Laboratories, Joining and Welding Research Institute Osaka University
  • TERASAKI Hidenori
    Faculty of Advanced Science and Technology, Kumamoto University
  • TANAKA Manabu
    Joining and Welding Research Institute Osaka University

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Other Title
  • 太径φ1.6mmワイヤを用いた高電流埋もれアーク溶接の電圧振幅制御による安定化

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The authors focused on a buried-arc phenomenon for a high-efficiency thick-plate welding and developed a “low-frequency modulated voltage control” in order to stabilize a buried arc at high-current range, which repeats high and low voltage terms using a welding power source with constant-voltage characteristic. When the control was applied to high-current buried-arc welding using solid wires of φ1.2mm and φ1.4mm, a rotating transfer mode was observed at a high-voltage term. It was clarified that a high-current buried-arc phenomenon was stabilized by supporting the buried space with a rotating arc. On the other hand, when the low-frequency modulated voltage control was applied to a solid wire of φ1.6mm, it was revealed that a rotating transfer mode was not observed although the control was effective in stabilizing a high-current buried-arc phenomenon. Our study shows its stabilization mechanism based on the experimental observation of the difference in arc phenomena during a buried-arc welding with and without low-frequency modulated voltage control, in this paper. Applying this result, we additionally report a high-efficiency thick-plate welding with a low wire feed rate condition.

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