| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate a weld defect which is apt to occur in a seam part of a bead substantially completely. <P>SOLUTION: Welding is carried on with two welding heads 11A, 11B by allotment to a direction of three o'clock and a direction of nine o'clock, downward allotment welding for connecting the bead is carried out at a position of six o'clock, and a preceding welding step on a position side of three o'clock and a following welding step on a position side of nine o'clock are performed in this order with a prescribed time difference. A welding end position by a preceding torch 9 of a preceding-side welding head 11A and a welding end position by a following torch 10 are set to the same position, a welding end position by a preceding torch 9 of a preceding-side welding head 11B and the welding end position by the following torch 10 are set to the same position, and crater processing is performed at the welding end part of the following torch 10 is performed to complete welding of one round. <P>COPYRIGHT: (C)2013,JPO&INPIT |
