船殻におけるHT50鋼板大入熱溶接継手部に必要な靱性値についての一考察

概要

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More and more of 50kgf/mm^2 high tensile steel plates produced by thermomechanical control process (TMCP) have come to find applications in ship hull production, and so has the use of high heat-input welding processes exceeding 100kJ/cm in heat-input in fabricating principal hull structural members, such as the side shell, strength deck, etc. Accordingly, the authors performed a study, for prevention of brittle fracture initiation, to determine the level of toughness required of the high heat-input welded joints produced in 50kgf/mm^2 TMCP high tensile steel plates, with the result that the welded joints in respective grades of TMCP high tensile steel could be considered acceptable provided the following requirements were met. KA32, KA36: vE_<20・c>≧3.5kgf・m KD32, KD36: vE_<0・c>≧3.5kgf・m KE32, KE36: vE_<-20・c>≧3.5kgf・m
社団法人日本船舶海洋工学会の論文
1986-03-01