Abstract
50 kgf/mm2-class high-tensile steel plate produced by newly developed TMCP (thermo-mechanical control process) is superior to conventional rolled steel plate in weldability (resistance to low-temperature cracking) as well as in toughness of HAZ of the high heat-input welded joint.However, HAZ of high heat-input welded joint softens because of the low carbon equivalent.The authors investigated the tensile strength of the welded joint with soft HAZ in ship hull and other heavy steel structures.As a result, it was found that even with the maximum heat-input welding process prevalently in use in most of the domestic ship-yards, the tensile strength of the welded joint thereby produced in wide plate would be 50 kgf/mm2 or more and approximate that of the base metal when Ceq. _≥0.23%.
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