A Study on Corrosion Fatigue Properties of Welded Joints for TMCP High Strength Steels

J. Ocean Eng. Technol. 1996;10(3):14-23.

TMCP 고장력강 용접부의 부식도영 특성에 관한 연구

이택순,이휘원,김영철

영남대학교 기계공학과,영남대학교 기계공학과,영남대학교 기계공학과

Keywords: Accelerated Cooled Type TMCP Stell, One-Side One-Run Submerged Arc Welding, Corrosion Fatigue, Heat affected zone, Softening

핵심용어: 가속냉각형TMCP강, 평면자동용접, 부식피로, 열영향부, 연화

Abstract

The corrosion fatigue test were carried out to evaluate the fatigue characteristics of accelerated cooled (ACC) TMCP high tensile strength steels and weld joint with high heat input by one side one run submerged are welding. In this paper, the fatigue crack growth behaviors were investigated with the center crack tension specimen of base metal and heat affected zone in substitute sea water and air, respectively Main results obtained are sunnarized as follows: 1. The fatigue crack growth rates in sea water faster than those in air environment for the different heat input values, crack growth rate of base metal is very fast and effect of heat input is not remarkable. 2. In HAZ (82kJ/cm, 116kJ/cm), the crack branching phenomena were observed in both air and sea water environment, 3. In SEM observation, the corrosion effect on base metal was larger than that on HAZ in corrosion environment.