SUS405ステンレスクラッド鋼の初層溶接割れに関する研究

概要

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The effect of preheating temperature, chemical compositions and hardness of weld metal on delayed cracking susceptibility of type 405 stainless clad steel welding was investigated by the slit type cracking test using nine different covered electrodes. The main results were summarized as follows : 1) For the prevention of the weld cracking, preheating was more effective than lowering of weld metal hardness. In the same preheating condition, the weld metal was less susceptible to cracks if its hardness was lower. 2) As preheating temperature rised, the diffusible hydrogen content in weld metal decreased remarkably at the temperature range in which cracks were liable to occur. 3) The Vickers hardness of weld metal (Hv) was satisfactorily given as below by Ferrite index (F_<idx>) calculated from the chemical compositions. Hv=804-47 F_<idx> (8<F_<idx><13.5) where F_<idx>=[Cr+Mo+1.5Si+2Al+4Nb+9Ti]-[Ni+30(C+N)+0.5Mn] (wt%) As preheating temperature rised, cracks generated in lower F_<idx>.
1987-02-05