Self-protective flux-cored wire for all-position underwater wet welding in deep water environment

Abstract

The invention belongs to the technical field of welding materials and discloses a self-protective flux-cored wire for all-position underwater wet welding in a deep water environment. The self-protective flux-cored wire comprises a metal skin and a flux core. The metal skin is formed by rolling an N6 nickel strip. The basic slag system of the flux core is an alkaline calcium fluoride-aluminum-magnesium slag system. The N6 nickel strip comprises, by weight, no smaller than 99.5% of Ni and Co in total, no larger than 0.06% of Cu, no larger than 0.10% of Fe, no larger than 0.05% of Mn, no larger than 0.10% of C, no larger than 0.10% of Si and no larger than 0.005% of S. The flux core comprises, by mass, 52-67% of fluoride, 14-20% of aluminum-magnesium alloy powder, 5-10% of calcium carbonate, 5-15% of ferromanganese, 3-10% of chromium, 4-10% of titanium and 1.5-5% of rare earth. The filling rate of the flux core in the flux-core wire is 24-32%. According to the scheme provided by the invention, the self-protective flux-cored wire can be used for welding under water by 100-200 meters, arcing is easy during welding, arc burning is stable, no arc blowout or breaking phenomenon occurs, an obtained welding seam is attractive in forming, the tensible strength of deposited metal after welding is larger than 500 MPa, and the self-protective flux-cored wire has good impact toughness and meets the all-position welding requirements of medium and low carbon steel and low alloy high strength steel in the deepwater environment.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a self-protecting flux-cored welding wire for all-position underwater wet welding in a deep-water environment. Background technique [0002] With the increase of the scale of marine engineering construction, the application of underwater welding is becoming more and more frequent. Due to the need to develop deep-sea resources, the construction depth of underwater welding continues to increase, so there is an urgent need to improve welding quality and production efficiency in deep-water environments. Self-shielded flux-cored wire for underwater wet welding is a welding material that can be welded directly in water without drainage and without a protective atmosphere. It has the advantages of simple operation, high efficiency, high quality and automatic welding during underwater welding. Features, can meet the welding needs in deep water environment. However...

AI Technical Summary

Problems solved by technology

However, compared with welding in shallow water environment, welding in deep water environment still has the following problems: (1) Under the action of water pressure, the welding arc shrinks seriously, the arc is unstable, and frequent arc extinguishing is prone to occur; (2) alloying elements burn The damage is serious, and the quenching effect of water, the welded joint is very brittle

However, due to the influence of water pressure, there will be great differences in welding in deep water environment and shallow water environment, and these two kinds of flux cored wires are not specially designed for the welding characteristics of deep water environment, nor are they suitable for deep water environment. Therefore, it is not possible to determine whether these two flux-cored wires are suitable for welding in deep water environments.

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