Effects of Pre- and Post-Heating on Weld Cracking of 9Cr-1Mo-Nb-V Steel

概要

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Preheating and postheating suitable for avoiding the heat-affected zone cracking in 9Cr-1Mo-Nb-V steel were studied using restrained test specimens consisting of casting (25 mm in thickness), forging (14 mm in thickness) and pipes (533 mm o.d., 107 mm in thickness, and 50.8 mm o.d., 10 mm in thickness). The results indicate that (1) minimum preheating temperature to prevent the cracking is about 200℃, which is lower than the values (over 300℃) estimated from the chemistry of 9Cr-1Mo-Nb-V steel used ; (2) hte preheating temperature, however, becomes higher when the weld is made with an electrode of mild steel or 58 kg/mm^2 tensile steel ; and (3) use of a martensitic weld metal lowers the residual stress and results in low susceptibility to cracking.
社団法人溶接学会の論文
1988-10-01