PURPOSE: To automatically carry out the welding of excellent quality by changing the oscillating width for a welding wire according to the position in the pulling-up direction, and carrying out the welding using the oscillating pattern such as figure 8-shape for the movement of the welding wire in diametrical direction of a steel rod of the groove surface and in the width direction of the groove.
CONSTITUTION: In carrying out the welding while the welding wire is pulled up from the farthest end of the groove space 31, the groove space 31 is welded while performing the oscillating pattern such as figure 8-shape, zigzag shape or a rectangular shape to the welding wire through the combination of three axes, i.e., the wire pulling-up motion Z, the circular-arc-shaped oscillating motion R in the diametrical direction of a steel rod at the groove surface, and the oscillating motion Y in the groove width direction according to the condition of the groove, and changing the oscillating width and the oscillating speed of three axes according to the program. The bead shape is improved thereby, and the automatic welding can be carried out which is free from any welding defects such as the incomplete fusion even in the horizontal position welding of a vertical reinforcing bar which is considered to be the most difficult welding, excellent in the appearance and shape, and excellent in quality.
KODAMA SHINJI
AZETA TAKESHI
OBATA SANSHIRO
