A Study on the Characteristic Change of 2.25Cr-1Mo Steel Welds for Various Welding Processes

J. Ocean Eng. Technol. 2005;19(1):49-56.

BANG HAN-SUR;OH CHONG-IN;BANG HEE-SUN;KIM HYUNG;

Dept. of Naval Architecture and Ocean Engineering, Chosun University;Dept. of Naval Architecture and Ocean Engineering, Graduate School of Chosun University;Dept. of Naval Architecture and Ocean Engineering, Chosun University;Dept. of Naval Architecture a

용접 공정에 따른 2.25Cr-1Mo강 용접이음부의 특성 변화에 관한 연구

방한서;오종인;방희선;김형;

조선대학교 공과대학 선박해양공학과;조선대학교 선박해양공학과 대학원;조선대학교 공과대학 선박해양공학과;조선대학교 선박해양공학과 대학원;

Keywords: 2.25Cr-1Mo Steel, Arc Welding, Laser Welding, Welding Residual Stress, Brittle Fracture, Charpy Test

핵심용어: 크롬 1몰리브덴 강, 아크용접, 레이저용접, 용접잔류응력, 취성파괴, 샤르피 시험

Abstract

In spite of the merits of laser welding being able to obtain the high welding quality such as smaller width of melting and heat affected zone, smaller welding deformation and fine grains of weldment compared to arc welding, laser welding is mainly used in joining of thin steel parts of electronics industry. Laser welding is getting widely used in joining thick plate and special kinds of steel due to its high power. While the arc welding is still applied for 2.25Cr-1Mo steel which is the essential material of atomic power generation equipment, the laser welding is not yet applied despite its high quality. So it has a trial to a special case demanding high welding quality such as atomic power plant. Accordingly, in this research, the mechanical properties of weldments by arc and laser welding were investigated using FEM to confirm the applicability of laser welding to 2.25Cr-1Mo steel. The Charphy test was carried out to understand the effect on the fracture toughness of weldments. The results of examination and test of the mechanical properties showed the validity of this research.