1974 Volume 43 Issue 9 Pages 876-885
This paper deals with residual stresses of high tensile steel member caused during the welding process.
The characteristics of the residual stress distributions in I section members and welded plates of 80 Kg/mm2 high tensile steels (HT80) and 50 Kg/mm2 high tensile steels (SM50) are discussed by the experiment, the simple model (a connected bar-spring model) and numerical analysis using thermo-elasto-plastic theory.
The following results are obtained.
1) The ratio of average compressive residual stress of HT80 to yield stress is less than that of SM50. This is due to the narrow tensile stress zone of HT80 and its small ratio of tensile residual stress to yield stress.
2) The tensile stress zone of HT80 is narrower than that of SM50 by reason that the maximum heating temperature of HT80 which is necessary for the tensile residual stress appearance is higher than that of SM50.
3) Preheating operation for welding of HT80 is effective to reduce the residual stress.
But, for welding of SM.50, preheating is not effective.
