Surfacing flux-cored wire with abrasion-resistant surfacing layer adapting to complex working conditions

Abstract

The invention belongs to the technical field of welding materials, and particularly relates to a surfacing flux-cored wire with an abrasion-resistant surfacing layer adapting to complex working conditions. The surfacing flux-cored wire comprises a cross core, an outer skin I, an outer skin II and a flux core, wherein the cross core is made of titanium alloy, the outer skin I is made of tantalum alloy, and the outer skin II is made of niobium alloy, and the flux core comprises the following components of 9%-12% of hollow cage-shaped carbon microspheres, 10.2%-12.6% of nano silicon nitride, 3.5%-5.2% of Mg, 2.5%-4.2% of manganese fluoride, 4.2%-5.6% of sodium carbonate and the balance of FHT100.25 reduced iron powder. According to the surfacing flux-cored wire, various carbides and nitridescan be formed in surfacing deposited metal, the hard phases are various and large in number, the abrasion-resistant surfacing layer can adapt to complex working conditions, metallurgical reaction of amolten pool is sufficient, the minimum hardness value of deposited metal is 68.2 HRC, hardness distribution is uniform, and the service cycle of the flux-cored wire is more than three times that of asurfacing layer of a common flux-cored wire.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a flux-cored welding wire with a wear-resistant surfacing layer adapted to complex working conditions. Background technique [0002] Wear is one of the main causes of mechanical failure, such as vertical mill rollers and discs and squeeze rollers in cement plants, coal mill rollers and discs in thermal power plants, crusher hammers and drums, excavator shovel teeth, throwing The blades of the pill machine, as well as some lining plates and sieve plates, cannot be used due to local wear and damage during use, and the loss is huge. The commonly used improvement process is to form a wear-resistant surfacing layer by surfacing on its surface. Overlay welding technology is a commonly used surface modification and repair method. In recent years, flux cored wire has gradually become the preferred welding material for wear-resistant surfacing welding. By surfacing s...

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Problems solved by technology

Due to the combined effects of ① and ②, the wear-resistant surfacing layer can only work under simple working conditions and cannot adapt to complex working conditions.

[0005] 2) In order to form a carbide hard phase in the deposited metal of the surfacing, it is necessary to increase the carbon source in the core, but due to the agglomeration effect of the carbon source such as graphite, under the action of the arc heat input and the arc force, with other elements The formed carbides are unevenly distributed, resulting in uneven hardness distribution of the entire workpiece surfacing welding deposit metal, which cannot achieve the purpose of enhancing wear resistance

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