해양구조물용 YS 420MPa 강재 Flux Cored Arc 용접금속의 기계적 성질에 미치는 용접 자세의 영향
Effects of Welding Position on the Mechanical Properties of Flux Cored Arc Welded Metal of 420MPa Yield Strength Steels for Offshore Structures
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초록
본 논문에서는 해양구조물용 항복강도 420MPa 강재에 플럭스코어드아크용접 프로세스를 적용하여 맞대기 용접한 용접금속의 기계적 성질에 미치는 용접 자세의 영향을 연구하였다. 수평자세 맞대기 용접금속의 합금원소 회수율이 수직상향자세에 비해 높고, 높은 전위 밀도를 가지는 저온 변태상의 분율이 높게 나타났다. 이에 따라 수평자세용접금속의 항복강도, 인장강도, 충격인성이 수직상향자세 용접금속 대비 높게 나타났다. 또한 용접금속의 충격인성은 M-A상 분율보다는 용접금속 미세조직 구성과 분율에 더 많은 영향을 받았다.
Abstract
This study investigated the mechanical properties of flux-cored arc weld metal of 420-MPa yield-strength (YS) steels for offshore structures based on welding position. Results showed that the recovery rate of alloying elements in the horizontal-position weld metal was higher than that in the vertical-up-position weld metal, and the fraction of low-temperature transformation phases with high dislocation density in the horizontal-position weld metal was high. Consequently, the YS, tensile strength, and impact toughness of the horizontal-position weld metal were higher than those of the vertical-up-position weld metal. In addition, the impact toughness of the weld metal was affected to a greater extent by the microstructure and fraction of the weld metal itself than by the fraction of the martensite–austenite constituents.
참고문헌 (11)
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