| 摘要 |
A welded structure wherein steel plates having at least parts of the base metal with a brittle crack arrest toughness Kca of 4000N/mm 1.5 or more are butt welded together so as to form a welded joint, wherein at least one location of the welded joint is provided with a crack control part comprising an arrester member comprising a steel material with a brittle crack arrest toughness Kca of 6000N/mm 1.5 or more and arrester welded joints formed by the arrest member being butt welded to steel plates 1 and wherein outer edges of the arrester member are formed so as to slant from the weld line of the steel plate welded joint 2 by 15° to 50° with respect to the longitudinal direction of the welded joint, whereby even if a brittle crack occurs in the welded joint, the brittle crack can be made to propagate along the slanted outer edges of the arrester member and be diverted to the base metal steel plates to thereby prevent the brittle crack from propagating through the welded joint. |
