High-wear-resistance flux-cored electrode and preparation method thereof

Abstract

The invention discloses a high-wear-resistance flux-cored electrode and a preparation method thereof. The electrode comprises a pipe body, a flux core and a coating; the pipe body is filled with the flux core; the coating wraps the pipe body; the flux core is prepared from the components including tungsten carbide and boron carbide, and the weight ratio of the tungsten carbide to the boron carbidein the flux core is 1:1; and the coating is prepared from the components including, by weight, 40.0%-45.0% of tungsten carbide, 3.0%-7.0% of graphite powder, 21.0%-26.0% of chromium equivalent, 13.0%-21.0% of high-potassium feldspar powder and 1.0%-23.0% of nominal iron powder. According to the electrode, the problems that powder leaks from the end of a welding arc, a pipe coating and a coating become red, a flux core is prone to oxidation or serious sintering and the like can be avoided, meanwhile, the relatively high stripping resistance, welding process and economical efficiency are achieved, the coating and the pipe core are resistant to reddening, the porosity resistance, the stripping resistance, the cost performance and the like are superior to those of existing similar electrodesor gas welding tubular tungsten carbide rods, the welding seam metal hardness is high, and the wear resistance is excellent.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a high-wear-resistant flux-cored electrode and a preparation method thereof. Background technique [0002] Extrusion and shearing parts, such as screw propellers and shearing knives, are widely used in the production of waste recycling recycled materials, recycled materials of wheat straw or straw, bamboo charcoal, rubber and plastic (nylon) particles, etc. During the working process, this kind of tough material with coarse and hard fibers will cause serious wear and tear to the parts it acts on, resulting in scrapping. In order to prolong the service life of these spare parts, it is necessary to carry out hard surface treatment on the working surface (that is, the surface in contact with thick fibers, etc.), and surfacing welding tungsten carbide layer is a simple and feasible method, and has been widely used. [0003] In the field of wear-resistant surfac...

AI Technical Summary

Problems solved by technology

Because the arc droplet temperature of these processes is much higher than the melting temperature of tungsten carbide, the particles and properties of these tungsten carbides have been changed at high temperatures, and the original high wear resistance cannot be maintained. Welding consumables or processes that reduce the melting of tungsten carbide and can increase the bonding strength between the welding layer and the base metal, so as to give full play to the original quality characteristics of tungsten carbide and meet customer needs

[0004] At present, there have been many reports on the research on tungsten carbide high wear-resistant welding materials. These existing technologies generally involve solid core electrodes or gas welding tungsten carbide welding rods involving tungsten carbide materials, and some of them involve flux core structures. Tungsten carbide electrode, such as: "a kind of tungsten carbide wear-resistant flux-cored welding electrode" disclosed by CN101116932A, its welding core is 96%-98% tungsten carbide powder and 2%-4% nickel wrapped in a carbon steel hollow tube, Its coating composition is general alkaline material (the total amount of marble powder and fluorite powder accounts for 68% to 73%), and a small amount of tungsten carbide (10% to 14%), which is mainly used to solve weld cracks and improve slag system. The performance and weld shape are beneficial to the welding process of all-position welding, and the alloy materials such as tungsten carbide transitioning to the surfacing layer are mainly realized through flux cores, and the effect of further improving the wear resistance of the surfacing layer is still limited

Moreover, during manual arc welding, because the tube skin of the flux-cored electrode is very thin, the end area is small, and the current density passing through is quite large, the heating rate is very fast, which can easily cause the tube skin to melt, redden and the filling in the tube Problems such as oxidation, sintering or roasting of the welding core will also cause perforation and powder leakage of the welding core arc droplet (arc end), and the above technical defects are directly related to the quality of the surfacing layer, which will also lead to the inability to continue welding, and The metal composition of the subsequent surfacing layer is very different from that of the previous one, which cannot meet the design requirements

For gas welding tungsten carbide welding consumables, because there are substantial differences between them and arc welding consumables in terms of melting properties, transition alloys, metallurgical chemical reaction mechanism between metals in the molten pool, etc., the two welding consumables not comparable

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