570MPa급 다층용접금속의 강도 및 충격인성에 미치는 입열의 영향

Abstract

Influence of heat input on the tensile strength and impact toughness of multipass weld metal made with AWS E81T1-Ni1 metal-cored wire was investigated. Welding parameters such as current, voltage and travel speed were varied independently to get different heat inputs. Even though variation of heat input resulted in different microstructure and chemical composition, tensile strength was controlled mainly by the chemical composition of weld metal. An increase of heat input by current resulted in higher recovery of deoxidation elements in weld metal and thus showed an increase of tensile strength in spite of higher heat input.