Flux-cored wire for visible arc overlaying of high-chromium cast iron

Abstract

The invention relates to a flux-cored wire for the visible arc overlaying of high-chromium cast iron. According to the flux-cored wire, a flux core comprises the following components in percentage by mass: 40 to 60 percent of high-carbon ferrochromium, 1 to 6 percent of graphite, 4 to 8 percent of electrolytic manganese, 2 to 6 percent of low ferrosilicon, 10 to 30 percent of metal chromium, 8 to 15 percent of aluminum magnesium alloy and 10 to 20 percent of other alloys. When the flux-cored wire is used for welding, a dilution rate is low, an electric arc is stable, a weld joint does not have slag and has ultrahigh hardness and corrosion resistance, and the overlaying can be performed directly without addition of soldering fluxes and protective gas, so that the construction cost is reduced, and the inconvenience of the operation is reduced.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a high-chromium cast iron open-arc surfacing flux-cored welding wire and a preparation method thereof. Background technique [0002] High-chromium cast iron material has relatively good wear resistance and certain corrosion resistance. Domestic enterprises usually use this material when surfacing coal grinding rollers and grinding discs. At the same time, they will use submerged arc welding wire and flux for surfacing. However, it has the following disadvantages: the penetration depth of the weld is relatively large, and the dilution of the base metal to the material is relatively serious. It often requires multiple layers of surfacing welding to achieve the required hardness value of HRC60, so the waste of surfacing welding materials is inevitable; in addition, Since submerged arc welding must comply with many and strict operating specifications, including some devices...

AI Technical Summary

Problems solved by technology

However, it has the following disadvantages: the penetration depth of the weld is relatively large, and the dilution of the base metal to the material is relatively serious. It often requires multiple layers of surfacing welding to achieve the required hardness value of HRC60, so the waste of surfacing welding materials is inevitable; in addition, Due to the many and strict operating specifications that must be followed during submerged arc welding, including some devices must be added to the welding operation; at the same time, it also needs to be protected with flux, which has caused an increase in construction costs and inconvenience in work.

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