A high-toughness titanium-alkaline seamless flux-cored wire suitable for all-position welding

Abstract

The invention discloses a high-toughness titanium alkaline type seamless flux-cored wire suitable for all-position welding. The flux-cored wire is composed of a low-carbon steel strip at the peripheryand flux core powder inside; and the flux core powder comprises the following components, by weight percentage: 30-40% of rutile, 1-2% of aluminum oxide, 2-4% of dehydrated feldspar, 1-3% of quartz,1-3% of zircon sand, 1-2% of rare earth oxide, 1-2% of silicon powder, 0.2-0.4% of ferroboron, 6-8% of nickel powder, 8-15% of metal manganese, 4-9% of magnesium powder and the balance iron powder andinevitable impurities. According to the flux-cored wire, a titanium alkaline slag system is adopted, the proportion of alloy elements is optimized, the content of mineral powder is adjusted, and under the protection of CO2 gas, horizontal, transverse and vertical position welding can be realized; the mechanical property is stable, the impact power at 40 DEG C below zero reaches 100J, the crack resistance is good, diffusible hydrogen is low, the moisture resistance is strong, the seawater corrosion resistance is good, and the anti-cracking ability is good.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a high-toughness titanium-alkaline seamless flux-cored welding wire suitable for all-position welding. Background technique [0002] With the development of ships and marine engineering, the construction of engineering structures will be transferred to the direction of automation and high efficiency in the future, which makes the demand for automatic and efficient welding methods more urgent. Among the existing welding consumables, flux-cored wire can realize continuous automatic welding, which promotes the automation and high-efficiency development of welding technology, and the composition of flux-cored wire is easy to adjust. At present, shipyards have generally adopted CO 2 Gas-shielded flux-cored wire is used to weld ship structures, and the utilization rate reaches more than 80%. Flux-cored welding wire is also widely used in bridges, pressure vessels, automobile...

AI Technical Summary

Problems solved by technology

[0003] Compared with the seamless flux-cored wire, the traditional seamed flux-cored wire is easy to absorb moisture during transportation and storage due to the different production process of the traditional seamed flux-cored wire. During the later welding process, the content of diffusible hydrogen in the weld metal increases. The tendency of cracks increases; at the same time, the porosity sensitivity of the flux-cored wire after moisture absorption increases during welding, which will eventually lead to a decline in welding quality and mechanical properties of welded joints

[0004] The existing acidic slag-based flux-cored welding wire has good welding processability, but it is difficult to obtain weld metal with good low-temperature toughness due to its high oxygen content in the weld; the weld metal of the basic slag-based welding wire has low oxygen content , strong dehydrogenation, S, P removal ability, excellent low-temperature toughness, but there are large spatters, unstable arc, difficult slag removal, and poor vertical welding operability during the welding process, so it is not suitable for all-position welding

It is difficult for the existing welding wire to meet the characteristics of excellent operation process and stable low temperature toughness at the same time

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