To provide a welded structure of thick steel plates, which is high-heat input butt welded, can surely stop the brittle crack caused and progressing in the welded structure of the thick steel plates composed of the thick steel plates having thickness exceeding 50 mm, has a sufficient fatigue strength, and is excellent in working efficiency and cost effectiveness.
The plane of the second thick steel plate 2 of the welded structure WS composed of the thick steel plates both having plate thicknesses exceeding 50 mm where the end of the butt weld zone 1c of the first thick steel plate 1 cross, and at least on one side of the plate thickness of the second thick steel sheet 2 on the outside of the first thick steel plate 1, an oblong hole 4 whose longitudinal direction follows the plane of the first thick steel plate 1 and which penetrates the second thick steel plate 2 is provided.
NAKAGAWA TOMOKAZU
TSUTSUMI KAZUYUKI
TAMURA EIICHI
Makoto Suhara
Takenaka Yoshimichi