TMCP型50キロHT鋼板大入熱溶接継手の海水中疲労強度について

概要

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The authors performed a study to determine the fatigue strength in artificially created seawater environments (naturally corrosive environment and galvanically corrosive environment) of high heat-input welded joints produced using high heat-input processes (FCB and CES) in 20mm-thick KD36 50kgf/mm^2 high tensile steel plate which was manufactured by accelerated cooling type thereto-mechanical control process (AcC type TMCP), with the following results. (1) The welded joints produced by FCB process and CES process exhibit almost no significant differences as regards the fatigue strength. (2) Both the welded joints produced using FCB process and CES process commonly exhibit small decline in their fatigue strengths when in artificially created naturally corrosive seawater environment. (3) Fatigue crack propagation along HAZ of the welded joint in artificially created naturally corrosive seawater environment takes place about three times as fast in speed (da/dn) as that taking place in atmosphere, once it exceeds a level of about 10^<-4>mm/cycle.
1986-03-01