| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a butt welding method by composite welding of arc welding and laser welding where the control of the intervals between bevel roots can stably and securely be performed, and an excellent weld zone having satisfactory penetration and free from welding defects can be obtained on butt welding for a thick steel plate under the condition of a long welding margin and butt welding for a large-sized structure such as seam welding for a large-sized UO steel tube. <P>SOLUTION: In the butt welding method by composite welding of laser welding and gas-shielded arc welding, the material to be welded is temporarily assembled, thereafter, a bevel root along a welding line is irradiated with a laser and is melted to cut so that the root intervals reach 0.1 to 3.0 mm, and subsequently, the composite welding of laser welding and gas-shielded arc welding is performed. The heat input in the laser welding is set to≥0.1 kW, and also, the heat input in the gas-shielded arc welding is set to 0.1 to 2.5 kJ/mm. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
