Influence of microstructures on the toughness in the weld metal by the Titania-based flux cored wire

Abstract

In order to realize low cost productions with the high quality, various flux cored wires have been developed corresponding to needs of industrial fields. In this study, the improvement of the toughness in the weld metal by Titania-based flux cored wires is described. We have tried various alloy-designed flux-cored wires, and have estimated their microstructures. It has been found that decreasing the oxygen content and lowering impurity contents of Nb and V are extremely effective to improve the toughness in the weld metal by the Titania-based flux cored wire.