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.
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