A kind of iron-based self-shielding flux-cored welding wire and its prepared surfacing alloy and method

Abstract

The invention belongs to the field of material machining and welding, and particularly relates to an iron-based self-protection flux-cored wire, a surfacing alloy manufactured with the iron-based self-protection flux-cored wire and a method for manufacturing the iron-based self-protection flux-cored wire. Flux-cored powder is wrapped by a carbon steel strip, and the mass percent of the flux-cored powder in the flux-cored wire ranges from 46 percent to 50 percent. The flux-cored powder comprises, by mass, 50 percent to 64 percent of high carbon ferro chrome, 5.5 percent to 11 percent of ferroboron, 1 percent to 6 percent of ferromolybdenum, 1 percent to 3 percent of electrolytic manganese powder, 3 percent to 8 percent of ferrosilicon, 2 percent to 7 percent of graphite, and the balanced reduced iron powder. According to setting of welding process parameters, the voltage ranges from 30 V to 35 V, the current ranges from 320 V to 380 V, the feeding speed ranges from 430 mm / min to 500 mm / min, and the length of the part, stretching out of a contact tube, of the flux-cored wire ranges from 15 mm to 30 mm. The number of chromium elements in the iron-based self-protection flux-cored wire is lower than that of chromium elements in a traditional grinding roller surfacing welding wire, so that the iron-based self-protection flux-cored wire is an environmentally-friendly welding material; and meanwhile the iron-based self-protection flux-cored wire has the high hardness and high wear resistance, and is good in surfacing welding manufacturability and attractive in formation of weld.

Description

technical field [0001] The invention belongs to the field of welding materials for material processing, and in particular relates to an iron-based self-shielding flux-cored welding wire, a prepared surfacing alloy and a method thereof. Background technique [0002] Grinding roller sleeves and grinding disc linings of coal mills are one of the parts that are easy to wear in power plants. With the increase in the demand for modern electricity consumption, the load of power plants is increasing, and the manufacturing and repair of these wear-prone parts are becoming more and more difficult. protrude. At present, there are generally two manufacturing methods, one is the method of casting with high chromium cast iron as a whole or in blocks, and the other is the method of surfacing welding of cast steel for production. Both casting and surfacing welding workpieces can be repaired to their original size by flux-cored welding wire surfacing welding after wear and tear and continue...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a wear-resistant surfacing flux-cored welding wire for coal mills, aiming at the large-scale coal grinding equipment (coal grinding rollers, grinding discs, etc.) The surface of the parts is often scrapped due to wear and tear, and the coal grinding equipment needs to be replaced and repaired on a regular basis. It is suitable for the working conditions of low-stress abrasive wear of large coal grinding equipment in power plants. It has high hardness, high wear resistance and self-protection. Reduce environmental pollution during the use of existing welding materials

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