Self-protection core welding stick used for underwater wet welding

Abstract

The invention provides a self-protection core welding stick used for underwater wet welding. The self-protection core welding stick used for underwater wet welding comprises two parts including a protection covering and a core wire and is characterized in that the protection covering is formed by rolling up a low-carbon steel belt, wherein the low-carbon steel belt comprises, by weight, 0.03% to 0.08% of carbon (C), 0.03% of manganese (Mn), <=0.02% of sulfur (S) and <=0.02% of phosphorus (P). The core is composed of oxide, fluoride, carbonate, manganese powder, nickel powder, aluminum powder and iron powder. The components comprises, by mass, 50%-63% of oxide, 5%-10% of fluoride, 5%-10% of carbonate, 3%-8% of manganese powder, 0%-5% of nickel powder, 0%-4% of aluminum powder and 10%-30% of iron powder. The self-protection core welding stick used for underwater wet welding is not only good in mechanical property, but also simple in arc starting in welding, stable in electric arc combustion, good in arc restarting capacity, and beautiful in appearance of a gained welding joint. The strength of extension of a butt joint can reach 500 Mpa. The self-protection core welding stick used for underwater wet welding can be used for welding of the underwater structure of low-carbon and low-alloy steel.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to a self-protecting flux-cored welding wire for underwater wet welding. Background technique [0002] Self-shielded flux-cored wire for underwater wet welding is a welding material that can be welded directly underwater without using underwater drainage devices and external shielding gas. Convenient, efficient, high-quality and other characteristics. Especially in the occasions where the welding and cutting workload is heavy, self-shielded flux-cored wire can save 50% of the cost compared with manual electrode because it does not need to change welding materials frequently and has higher deposition efficiency. In addition, the self-shielded flux-cored wire can be extended to semi-automatic and fully automatic welding technologies, and the formula and composition of the flux core can be adjusted, so that the slag-gas reaction can not only improve the weld morphology, but ...

AI Technical Summary

Problems solved by technology

However, at present, there is no underwater wet self-shielding flux-cored welding wire with completely independent intellectual property rights in my country, all of which rely on foreign imports and are severely restricted by foreign technologies.

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