Flux-cored wire for electrogas arc welding

Abstract

The present invention provides a flux-cored wire for electrogas welding, which has excellent operability in single-electrode electrogas welding of thick steel plate, and additionally can obtain a welding metal that has high strength and excellent impact property. The flux-cored wire for electrogas welding comprises the following components with the percent by weight: 0.03-0.07wt% of C, 0.3-0.6wt% of Si, 1.8-2.0wt% of Mn, 0.9-1.2wt% of Ni, 0.3-0.8wt% of Mo, 0.10-0.27wt% of Ti, 0.008-0.014wt% of B, 0.15-0.30wt% of Mg, less than 0.05wt% of Al, less than 0.025wt% of P, less than 0.025wt% of S, 1.0-2.0wt% of sinter forming agent, and 0.4-0.7wt% of F in the sinter forming agent.

Description

technical field [0001] The present invention relates to a single-electrode gas-electric vertical welding flux-cored wire capable of vertical one-pass welding of thick steel plates such as YP 460 steel. Background technique [0002] As a high-efficiency vertical welding process, gas-electric vertical welding is used in a wide range of fields such as ships, oil storage tanks, and bridges. Recently, the economic and industrial development of China and East Asian countries has been remarkable, and along with the increase in the volume of logistics, container ships have been rapidly increased in size for the purpose of efficient transportation of container cargo. [0003] With the increase in size of container ships, the thickness of side shell plating and hatch coaming is advancing. When the load capacity of the container is 8000TEU, if the yield strength (yield strength) 390N / mm 2 For steel, the application thickness is about 80mm. On the other hand, steel has a yield stren...

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Problems solved by technology

[0008] However, if simply adding alloy components to the existing welding wire to increase the strength, the viscosity of the slag during welding will increase, and the workability wil

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