船体構造用TMCP鋼のHAZ割れに関する一考察

概要

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Recently Thermo-Mechanical Controlled Process (TMCP) steel plates have been supplied as ship hull materials. Strength and toughness of TMCP steels are insured by its fine rolled structures, so that its alloy contents are less than that of same strength level conventional process steels. Therefore TMCP steels are superior to conventional steels in respect to several properties, especially HAZ cracking sensitivity. Generally speaking, metal structure, diffusible hydrogen and restricting force of weld joint induce HAZ cracking. But the authors thought that generation of crack sensitive structure in HAZ is more essential to HAZ cracking than diffusible hydrogen and restricting force of weld joint. In this paper, the authors investigated the generating condition of crack sensitive structure in ship welding procedures in the view point of welding conditions, kinds of steel plates and atmospheric conditions. The study showed that weld HAZ of TMCP steels generate non crack sensitive structure under the condition of conventional welding procedures in shipbuilding.
社団法人日本船舶海洋工学会の論文
1987-08-25