| 摘要 |
PURPOSE:To reduce welding man-hours by welding the upper plate side at the position where molten metal at the lower plate side is solidified and made to a weld bead and narrowing a gap of a horizontal joint. CONSTITUTION:A welding torch 4 is mounted on an automatic traveling carriage and advances and retreats the distance (l) from a point A to a point B while advancing at a constant speed. After a welding arc 6 welds the lower plate 1 side for several seconds at a high electric current area at the point A, the welding torch 4 retreats the distance (l) while making about a half turn clockwise like an arrow in the diagram and a welding arc 6b is generated at a low current area at the upper plate 2 side at the point B. When the welding arc 6b is generated for the several seconds at a low current at the point B, the welding torch 4 is allowed to make about a half turn auticlockwise like the arrow while advancing the distance (l) and returns to the original point A.
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