| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding method for manufacturing an extremely thick steel plate welded member of high quality by welding an extremely thick steel plate with high working efficiency. SOLUTION: In the low heat input high-efficiency welding method of an extremely thick steel plate having the tensile strength of≥490N/mm<SP>2</SP>, two extremely thick steel plates 1, 2 are arranged orthogonal to or parallel to each other so that a groove part B and a tapered narrow gap part A continuous to the groove part are formed when the two steel plates are butted; a backing metal 3 is arranged on a base side of the narrow gap A; and the narrow gap part is subjected to the revolving arc welding from the bottom side, and the groove part is subjected to the submerged arc welding. COPYRIGHT: (C)2008,JPO&INPIT |
