Flux-cored wire for surfacing wear-resistant alloy on surface of squeeze roller

Abstract

The invention belongs to the technical field of welding materials, and particularly relates to a flux-cored wire for surfacing wear-resistant alloy on the surface of a squeeze roller, the flux-cored wire comprises flux core powder and skin, and the flux core powder comprises the following chemical components: 15-18% of cesium carbonate powder with copper-plated surface, 8-12% of hydroxyl nickel powder, 6-8% of rutile powder, 2-3.5% of feldspar powder, 5-9% of silicon carbide whisker, 5-8% of manganese powder, 4-6% of silicon iron powder and the balance of FHT100. 25 reduced iron powder. Welding can be carried out under the plateau climate condition, electric arc combustion is stable, surfacing alloy components are uniform, and defects such as air holes, cracks and slag inclusion are avoided; the surfacing alloy is high in hardness and uniform in distribution, a hard phase is firmly combined with a matrix, and the phenomena of falling and cracking are avoided. The flux-cored wire is suitable for on-line hardfacing of the squeeze roller under the working conditions of mines and the like, prolongs the service life of a surfacing layer on the surface of the squeeze roller, and is an innovation in the aspect of flux-cored wires for surfacing wear-resistant alloy.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to a flux-cored welding wire of wear-resistant alloy for surfacing welding on the surface of a squeeze roller. Background technique [0002] Squeeze rollers are the key components of roller presses commonly used in mining equipment. The main purpose is to squeeze and pulverize ore materials to provide raw materials for subsequent production such as cement. However, the extrusion roller is large in size, with a diameter of about 0.5 meters to 4 meters, and a weight of dozens of tons. It is difficult to move. The method often used after the surface is worn is online wear-resistant surfacing repair. The working environment of the squeeze roller is mostly mine, in the plateau area, the air is thin, when the altitude is 4000 meters, the atmospheric pressure is 50kPa, which is about 50% of the normal plain environment atmospheric pressure of 101.3kPa. [0003] The essence of th...

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Problems solved by technology

[0003] The essence of the arc is the continuous and stable discharge behavior of the gas. The conventional flux-cored arc is the stable and continuous discharge of the air in the plain environment, but when the altitude is above 4000 meters, the air in the unit volume is reduced by about 50%, and the arc state It has been greatly affected, leading to problems such as arc instability, low voltage, and poor fusion, which in turn leads to insufficient metallurgical reaction of the molten pool as a whole, and uneven microstructure of the wear-resistant alloy surfacing on the surface of the extrusion roller. There are many defects such as pores and slag inclusions, which reduce the service life of the wear-resistant layer

[0004] Chinese patent CN112935625A provides a high-toughness alkaline all-position flux-cored wire that can adapt to plateau climate (application date: February 5, 2021), which partially solves the welding problem under plateau climate conditions, but has the following technical defects: ① In order to To avoid hydrogen embrittlement, barium fluoride, lithium fluoride, and rare earth fluoride are added to the drug core powder. Although these fluorides can decompose fluorine ions in the molten pool and then combine with hydrogen to escape, they play a role in removing hydrogen. Because the melting points of the three fluorides are not high (the melting point of barium fluoride is 1368°C, the melting point of lithium fluoride is 848°C, and the melting point of rare earth fluoride is about 1460°C), there are quite a lot of The fluoride decomposes, and the fluoride ions produced seriously deteriorate the arc atmosphere, causing the welding arc to be very unstable; ② adding barium carbonate to the core powder, the barium element is easy to ionize, and has a good stable arc effect, but it is not practical in practice. It cannot completely resist the damage to the arc caused by thin air under plateau climate conditions. This is because the ionization energy of barium is 502.9kJ / mol, which is higher than that of the commonly used potassium element, which is 418.8kJ / mol, resulting in the reduction of charged particles in the arc. poor arc stability

[0005] The hard phase is added to the flux-cored wire, and it is expected to obtain a metal-based hard phase-enhanced composite surfacing layer in the surfacing alloy to increase the hardness of the surfacing alloy. The current technical problems are: ①The relationship between the hard phase and the matrix The combination is not firm, and it is easy to fall off and crack; ②The hard phase is unevenly distributed, resulting in a large difference in hardness and shortening the service life of the wear-resistant layer