Three-dimensional particle simulation of a molten metal behavior in the buried arc welding was conducted by a computational model in which drop transfer and rotating transfer modes, that were observed during actual buried arc welding using a lowfrequency modulated voltage control scheme, were modeled to investigate the effect of a frequency of the control scheme on the buried space formation during this welding process. As a result, the diameter of a buried space was largely changed with collapses of the space when a switching frequency of those transfer modes which was equivalent to the frequency of the control scheme was set to be 50 Hz. On the other hand, a buried space whose diameter was much larger than a wire diameter was always maintained when the switching frequency was set to be over 100 Hz. This was because the metal transfer mode changed from the drop transfer to the rotating transfer before the collapse of the buried space started.

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