Flux-cored wear-resistant welding wire

Abstract

The utility model discloses a flux-cored wear-resistant welding wire. The flux-cored wire comprises a composite outer skin and a flux-cored filling layer filled in the composite outer skin, the composite outer skin comprises a low-alloy steel layer located on the outer side and a low-carbon steel layer located on the inner side, and a damp-proof layer is formed on the inner surface of the low-carbon steel layer in a spraying mode. The damp-proof layer is formed on the inner side wall of the double-layer cold-rolled steel strip in a spraying mode, the double-layer cold-rolled steel strip is formed into the U-shaped groove after the low-alloy steel layer and the low-carbon steel layer are subjected to laser welding, the deformation resistance is enhanced, and the damp-proof layer is beneficial for preventing the flux core from absorbing moisture.

Description

Technical Field

[0001] This utility model belongs to the field of welding materials technology, and in particular relates to a flux-cored wear-resistant welding wire. Background Technology

[0002] Flux-cored wear-resistant welding wire is an important consumable in the welding field, widely used for the repair and reinforcement of easily worn parts in engineering machinery, mining equipment, and other applications. Traditional flux-cored welding wires mostly use a structure where a single metal sheath encases a powder core material. However, in practical applications, this structure suffers from insufficient moisture protection of the sheath, and the powder core is prone to absorbing moisture and clumping, leading to problems such as excessive spatter and high porosity during the welding process. Utility Model Content

[0003] The purpose of this invention is to provide a flux-cored wear-resistant welding wire, which has a moisture-proof layer formed by spraying a coating on the inner wall of a double-layer cold-rolled steel strip. The double-layer cold-rolled steel strip is formed into a U-shaped groove by laser welding of a low-alloy steel layer and a low-carbon steel layer, which enhances the resistance to deformation and the moisture-proof layer helps to prevent the flux core from absorbing moisture, thus solving the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0005] This utility model is a flux-cored wear-resistant welding wire, including a composite outer sheath and a flux-cored filling layer inside the composite outer sheath; the composite outer sheath includes a low-alloy steel layer on the outer side and a low-carbon steel layer on the inner side, and a moisture-proof layer is formed by spraying the inner surface of the low-carbon steel layer.

[0006] Furthermore, the moisture-proof layer is a nano-Al2O3-TiO2 composite layer.

[0007] Furthermore, a nickel-based alloy foil layer is disposed between the low-alloy steel layer and the low-carbon steel layer.

[0008] Furthermore, a protective film layer is provided on the outer side of the low-alloy steel layer; the protective film layer is a rosin layer; the coating amount of the rosin layer is 0.8-1.2 g / m³. 2 Furthermore, the rosin undergoes hydrogenation treatment, with a hydrogenation degree ≥85%.

[0009] Furthermore, the core filling layer comprises a first component layer and a second component layer from the inside out; the first component layer is filled with nano-tungsten carbide particles and nickel-coated aluminum particles with a particle size of 50-100nm; the second component layer is filled with micron-sized chromium carbide particles and molybdenum-iron particles with a particle size of 10-30μm.

[0010] Furthermore, a third component layer is disposed on the outside of the second component layer, and the third component layer is filled with rutile and rare earth ferrosilicon.

[0011] Furthermore, a magnesium-based active strip layer is provided between the composite outer skin and the drug core filling layer, wherein the magnesium-based active strip layer is a Mg-Al-Zn foil.

[0012] Furthermore, the thickness ratio of the low-alloy steel layer to the low-carbon steel layer is 1:2-1:3; the carbon equivalent CE of the low-alloy steel layer is ≤0.45%, and it contains 0.8-1.2wt% vanadium.

[0013] This utility model has the following beneficial effects:

[0014] This invention forms a moisture-proof layer by spraying a coating onto the inner wall of a double-layer cold-rolled steel strip. The double-layer cold-rolled steel strip is formed into a U-shaped groove by laser welding of a low-alloy steel layer and a low-carbon steel layer, which enhances the resistance to deformation and helps prevent the core from absorbing moisture.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the flux-cored wear-resistant welding wire of this utility model. Figure 1 ;

[0018] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;

[0019] Figure 3 This is a schematic diagram of the structure of the flux-cored wear-resistant welding wire of this utility model. Figure 2 ;

[0020] Figure 4 for Figure 3 Enlarged view of a section at point B in the middle;

[0021] Figure 5 This is a schematic diagram of the structure of the flux-cored wear-resistant welding wire of this utility model. Figure 3 ;

[0022] Figure 6 for Figure 5 Enlarged view of a section at point C. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Please see Figures 1-2 As shown, this utility model is a flux-cored wear-resistant welding wire, comprising a composite outer sheath 2 and a flux-cored filling layer 1 wrapped inside the composite outer sheath 2. The composite outer sheath 2 includes a low-alloy steel layer 21 on the outer side and a low-carbon steel layer 22 on the inner side. A moisture-proof layer 23 is formed by spraying the inner surface of the low-carbon steel layer 22. The moisture-proof layer 23 is a nano-Al2O3-TiO2 composite layer with a thickness of 10μm. The moisture-proof layer 23 can prevent the flux-cored filling layer 1 from absorbing moisture. The thickness of both the low-alloy steel layer 21 and the low-carbon steel layer 22 is 0.3mm. The titanium in the moisture-proof layer 23 reacts with the carbon in the flux to generate TiC, which refines the weld grain. Thus, compared with the traditional single-layer outer sheath, the impact toughness of the weld is improved.

[0026] Specifically, the low-alloy steel layer 21 has a carbon equivalent CE ≤ 0.45% and contains 0.8-1.2 wt% vanadium.

[0027] In one specific embodiment, a nickel-based alloy foil layer 20 is provided between the low-alloy steel layer 21 and the low-carbon steel layer 22. The foil layer 20 has a thickness of 0.1 mm and a nickel content of ≥65 wt% and a chromium content of 18-22 wt%. The nickel-based alloy foil layer 20 is designed to absorb welding stress and effectively coordinate the thermal expansion difference between the low-alloy steel layer 21 and the low-carbon steel layer 22, thereby improving crack resistance.

[0028] In one specific embodiment, a film-forming protective layer 24 is provided on the outer side of the low-alloy steel layer 21. The film-forming protective layer 24 is a rosin layer; and it is formed by spraying rosin with hydrogenation treatment and a hydrogenation degree ≥85%, with a coating amount of 0.8-1.2 g / m. 2 Meanwhile, a dual moisture barrier is constructed by combining the nano-TiO2 composite layer and the hydrogenated rosin layer, ensuring that the moisture content of the welding wire is ≤0.3%.

[0029] In one specific implementation, such as Figures 5-6 Between the composite outer skin 2 and the core filling layer 1, there is also a magnesium-based active strip layer 3 with a thickness of 0.1 mm. The magnesium-based active strip layer 3 is a Mg-Al-Zn foil, and the mass percentage of Mg, Al and Zn is 85:10:5. When welding, the magnesium-based active strip releases Al and Zn vapors, which, together with the reducing gas produced by the decomposition of rosin, make the alloy element transition coefficient reach more than 92% and reduce the spatter rate to less than 5%. At the same time, Mg vapor is released during welding, which inhibits the oxidation of the molten pool and refines the grains.

[0030] Specifically, such as Figures 3-4 The core filling layer 1 provided in this application comprises, from the inside out, a first component layer 101, a second component layer 102, and a third component layer 103, with a weight ratio of 5:3:2. The first component layer 101 is filled with nano-tungsten carbide particles with a particle size of 50-100nm and nickel-coated aluminum particles, with a ratio of 4:1. The particle size distribution of the micron-sized chromium carbide particles satisfies D90≤35μm, and the particle surface is coated with a nickel plating layer of 0.5-1μm thickness. The second component layer 102 is filled with micron-sized chromium carbide particles with a particle size of 10-30μm and ferromolybdenum particles, with a ratio of 5:1. The third component layer 103 is filled with rutile and rare earth ferrosilicon, with a ratio of 3:2.

[0031] This application improves the hardness of the cladding layer through a gradient distribution of nano-WC + micron-Cr3C2; and improves the slag coverage integrity rate to 95% and reduces the porosity of the weld by synergistic deoxidation of rare earth ferrosilicon and rutile.

[0032] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A flux-cored wear-resistant welding wire, characterized in that: It includes a composite outer skin (2) and a core filling layer (1) filled inside the composite outer skin (2); The composite outer skin (2) includes a low alloy steel layer (21) on the outer side and a low carbon steel layer (22) on the inner side, wherein a moisture-proof layer (23) is formed by spraying the inner surface of the low carbon steel layer (22).

2. The flux-cored wear-resistant welding wire according to claim 1, characterized in that, The moisture-proof layer (23) is a nano-Al2O3-TiO2 composite layer.

3. The flux-cored wear-resistant welding wire according to claim 1, characterized in that, A nickel-based alloy foil layer (20) is provided between the low-alloy steel layer (21) and the low-carbon steel layer (22).

4. The flux-cored wear-resistant welding wire according to claim 1, characterized in that, A film-forming protective layer (24) is provided on the outer side of the low alloy steel layer (21); The protective film layer (24) is a rosin layer.

5. The flux-cored wear-resistant welding wire according to claim 4, characterized in that, The coating amount of the rosin layer is 0.8-1.2 g / m². 2 Furthermore, the rosin undergoes hydrogenation treatment, with a hydrogenation degree ≥85%.

6. The flux-cored wear-resistant welding wire according to claim 1, characterized in that, The core filling layer (1) includes a first component layer (101) and a second component layer (102) from the inside out; The first component layer (101) is filled with nano-tungsten carbide particles and nickel-coated aluminum particles with a particle size of 50-100nm. The second component layer (102) is filled with micron-sized chromium carbide particles and ferromolybdenum particles with a particle size of 10-30 μm.

7. The flux-cored wear-resistant welding wire according to claim 6, characterized in that, A third component layer (103) is provided on the outside of the second component layer (102), and the third component layer (103) is filled with rutile and rare earth ferrosilicon.

8. A flux-cored wear-resistant welding wire according to any one of claims 1-7, characterized in that, A magnesium-based active strip layer (3) is also provided between the composite outer skin (2) and the core filling layer (1), wherein the magnesium-based active strip layer (3) is Mg-Al-Zn foil.

9. The flux-cored wear-resistant welding wire according to claim 1, characterized in that, The thickness ratio of the low alloy steel layer (21) to the low carbon steel layer (22) is 1:2-1:

3.

10. The flux-cored wear-resistant welding wire according to claim 1, characterized in that, The low-alloy steel layer (21) has a carbon equivalent CE ≤ 0.45% and contains 0.8-1.2 wt% vanadium.

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