Flux-cored arc welding wire for providing superior toughness and weldability to a welded joint at a low temperature, and welded joint using same

Abstract

Provided are a flux cored arc welding wire able to improve low-temperature toughness of a weld joint and a weld joint using the same, in which the flux cored arc welding wire includes 0.01 wt% to 0.1 wt% of carbon (C), 0.3 wt% to 1.4 wt% of silicon (Si), 1.0 wt% to 3.0 wt% of manganese (Mn), 4.0 wt% to 7.5 wt% of titanium (Ti)+TiO, 0.01 wt% to 3.0 wt% of nickel (Ni), 0.01 wt% to 0 . 2 wt% of boron (B), 0 . 02 wt% to 0 . 42 wt% of yttrium (Y) or 0.02 wt% to 0.56 wt% of a rare earth metal (REM), and iron (Fe) as well as other unavoidable impurities as a remainder.

Description

technical field [0001] The present invention relates to a flux cored arc welding wire for use in the process of Flux Cored Arc Welding (FCAW) of offshore structures, energy industry, shipbuilding, construction, bridge construction or pressure vessels and a process using said flux cored arc welding wire Welded joints. Background technique [0002] Recently, relatively large ships, buildings, offshore structures, etc. have been constructed, and at the same time, the field of application thereof has been extended to extremely cold areas or deep sea areas. Since the above-mentioned structures may cause catastrophic damage to the environment and loss of life and property in a single accident, steel materials with high strength, ultra-thickness, and high-low temperature toughness have been used for such structures and vehicles. [0003] With the development of such steels, there is a need for safe and efficient welding, and the flux cored arc welding (FCAW) technique is the most ...

AI Technical Summary

Problems solved by technology

However, the arc may be unstable and a reduction in welding workability may occur, such as frequent occurrence of spattering in which fine particles are scattered around during welding

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