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방한서,방희선,김준형,유재선,Bang, Han-Sur,Bang, Hee-Seon,Kim, Jun-Hyung,You, Jea-Sun 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.5
Stainless steels is widely used in various industries due to its high strength and excellent corrosion resistance. However, in the case of fusion welding for stainless steel, chromium deficiency layer produced by chromium carbide precipitation during welding process causes corrosion-resistance to be lower and formation of intergranular corrosion. It requires a inevitable complex procedure such as pre-heating and post-heating process etc. to prevent such weld defects. From this viewpoint, the new welding process such as a solid state welding method is suited for welding of stainless steels due to its advantages over the fusion welding. Therefore this paper intends to investigate the research trend on friction stir welding, one of solid state welding processes for stainless steels.
용접 공정에 따른 2.25Cr-1Mo강 용접이음부의 특성 변화에 관한 연구
방한서(HAN-SUR BANG),오종인(CHONG-IN OH),방희선(HEE-SUN BANG),김형(HYUNG KIM) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.1
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.
하이브리드(CW Nd : YAG Laser+MIG) 용접을 이용한 A5052-H32 맞대기 용접부의 역학적 특성에 관한 연구
김준형(Jun-Hyung Kim),방한서(Han-Sur Bang),엠.에스.비죠이(M.S. Bijoy),전근홍(Geun-Hong Jeon),유재선(Jea-Sun You),방희선(Hee-Seon Bang) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.6
Recently, the application of aluminum alloys has been increasing for lightweight and high quality transport vehicles. Therefore, the proposal has been made to apply high speed hybrid welding methods to the marine grade aluminum alloy (A5052) used for shipbuilding by combining a 3-KW CW Nd : YAG laser and tire MIG welding process. In this study, the characteristics of the welding parameters were investigated for a hybrid butt joint. This paper also describes the determination of the heat distribution in a weldment and tire welding residual stress using a finite element method. Mechanical experimentation was also used to ascertain the reliability of tire weldment.