Flux-cored wire suitable for high-strength cutting pick sparkless wear-resistant cladding layer

Abstract

The invention belongs to the technical field of welding, and particularly relates to a flux-cored wire suitable for a spark-free wear-resistant cladding layer of a high-strength cutting pick, the flux-cored wire suitable for the spark-free wear-resistant cladding layer of the high-strength cutting pick comprises a flux core, and the flux core comprises the following components in percentage by weight: 50-60% of cast tungsten carbide particles, 6-10% of non-cast tungsten carbide particles, 5-10% of non-cast tungsten carbide particles, 5-10% of non-cast tungsten carbide particles, 5-10% of non-cast tungsten carbide particles and the balance of flux. The high-strength nickel-silicon alloy comprises, by weight, 6%-10% of silicon carbide and boron carbide, 2%-6% of silicon iron, 4%-10% of ferroboron, 2%-6% of tungsten powder, 2%-4% of silica powder, 2%-6% of deoxidizer, 1%-2% of fluoride and the balance nickel powder. The invention provides a flux-cored wire suitable for a spark-free wear-resistant cladding layer of a high-strength cutting pick.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of welding, and particularly relates to a flux-cored wire suitable for a high-strength pick tooth spark-free wear-resistant cladding layer. BACKGROUND

[0002] As a key consumable part of mining machinery and engineering equipment such as coal mining machines and heading machines, the tooth head of a pick tooth bears strong impact and severe abrasive wear during service. In order to protect the alloy tooth head, the current mainstream method is to prepare a wear-resistant cladding layer on the surface of the high-strength pick tooth base material fixed to the tooth head, which can effectively improve the service life and overall working efficiency of the high-strength pick tooth. In addition, in the mine environment containing gas, high-temperature sparks generated when the pick tooth rubs against coal and rock (especially hard minerals such as quartz contained therein) pose a safety hazard to gas explosion. Therefore, the requirements for the wear-resistant cladding layer preparation material matched with the high-strength pick tooth on the market are: dense bonding with the base material, high hardness, high wear resistance, high crack resistance, and no sparks generated during work, etc.

[0003] In view of the working condition requirements of the coexistence of wear and impact load, the current mainstream method is to add WC particles to the nickel-based alloy to make the cladding layer have good wear resistance and dense interface bonding. The current main preparation method of nickel-based tungsten carbide wear-resistant cladding layer is plasma spraying of hard alloy powder and laser cladding technology. Compared with them, the nickel-based tungsten carbide flux-cored wire cladding layer has a higher thickness. In addition, the plasma spraying and laser cladding technologies have huge equipment investment, complex process, and poor economy. The arc welding of the flux-cored wire has high production efficiency, simple equipment and process, and is more economical and effective.

[0004] In the technical solution of the patent "A composite carbide reinforced nickel-based alloy surfacing flux-cored wire" (CN114083177B), a pure nickel strip is used, and the tensile strength is low, which is prone to wire breakage during the drawing process of the flux-cored wire. Therefore, the wire needs to be annealed after being drawn, which brings great difficulty to the production of the wire. The WC content is low, and the main reinforcing phase is titanium carbide, which cannot meet the wear resistance requirements of high-strength pick tooth operation. The hot wire TIG is used, which has large equipment investment, complex process, and poor economy.

[0005] In the technical solution of the patent "A WC particle reinforced nickel-based MIG wear-resistant surfacing flux-cored wire" (CN103406689A), the anti-sparking requirement is not fully considered, and there is still a risk of spark generation in the dry friction working condition of the pick tooth. The hardness is 30-48HRC, which is relatively low for the hardness requirements of high-strength pick tooth operation. There is no technical solution for adjusting the welding thermal stress caused by the difference in thermal expansion coefficient between the base material and the hard particles, and the cladding layer is prone to cracking. SUMMARY

[0006] The application aims to provide a flux-cored wire suitable for high-strength pick no-spark wear-resistant cladding layer to solve the technical problems in the prior art.

[0007] The technical solution adopted by the embodiment of the application to solve the technical problems in the prior art is: The flux-cored wire suitable for high-strength pick no-spark wear-resistant cladding layer comprises a core, and the core comprises the following components in percentage by weight: 50%-60% of cast tungsten carbide particles, and 6%-10% of non-cast tungsten carbide, wherein the percentage by weight of the cast tungsten carbide particles to the non-cast tungsten carbide is 5:1 to 10:1.

[0008] The embodiment of the application can also adopt the following technical solution: In the flux-cored wire suitable for high-strength pick no-spark wear-resistant cladding layer, further, the percentage by weight of each chemical component in the cast tungsten carbide is: W≥95.5%, C≥3.98%, S≤0.01%, and P≤0.02%, and the percentage by weight of each chemical component in the non-cast tungsten carbide is: WC≥99.8%, and Cl≤0.001%.

[0009] In the flux-cored wire suitable for high-strength pick no-spark wear-resistant cladding layer, further, the core further comprises the following components in percentage by weight: 6%-10% of silicon carbide and boron carbide, 2-6% of ferrosilicon, and 4%-10% of ferroboron, wherein the total weight of the silicon carbide, the boron carbide, the ferrosilicon, and the ferroboron accounts for 12-26% of the total weight of the core.

[0010] In the flux-cored wire suitable for high-strength pick no-spark wear-resistant cladding layer, further, the percentage by weight of each chemical component in the silicon carbide is: SiC≥98.0%; the percentage by weight of each chemical component in the boron carbide is: BC≥95.0%; the percentage by weight of each chemical component in the ferrosilicon is: Si: 72-80%, S≤0.02%, and P≤0.04%; the percentage by weight of each chemical component in the ferroboron is: B: 19-22%, S≤0.02%, and P≤0.04%.

[0011] In the flux-cored wire suitable for high-strength pick no-spark wear-resistant cladding layer, further, the core further comprises the following components in percentage by weight: 2%-6% of tungsten powder, 2%-4% of silicon powder, 2%-6% of deoxidizer, 1%-2% of fluoride, and the balance is nickel powder. In the flux-cored wire suitable for high-strength pick no-spark wear-resistant cladding layer, further, The tungsten powder has the following weight percentage of chemical components: W≥99.0%, S≤0.01%, P≤0.004%; The silicon powder has the following weight percentage of chemical components: SiO2≥95.0%, S≤0.04%, P≤0.04%; The deoxidizer is an aluminum-magnesium alloy, and the aluminum-magnesium alloy has the following weight percentage of chemical components: Al: 47-53%, Mg≥47%; The fluoride is potassium fluozirconate and zirconium fluoride, wherein the potassium fluozirconate has the following weight percentage of chemical components: K2ZrF6≥95.0%, S≤0.03%, P≤0.03%, and the zirconium fluoride has the following weight percentage of chemical components: ZrF4≥95.0%, S≤0.03%, P≤0.03%; The nickel powder has the following weight percentage of chemical components: Ni≥99.0%, S≤0.02%, P≤0.01%.

[0012] In the flux-cored wire suitable for the high-strength pick no-spark wear-resistant cladding layer, further, the flux-cored wire suitable for the high-strength pick no-spark wear-resistant cladding layer further comprises a nickel-based alloy strip coated outside the flux core.

[0013] In the flux-cored wire suitable for the high-strength pick no-spark wear-resistant cladding layer, further, the nickel-based alloy strip has the following weight percentage of chemical components: Cr: 9-11%, S≤0.01%, P≤0.01%, and the balance is Ni and inevitable impurities.

[0014] In the flux-cored wire suitable for the high-strength pick no-spark wear-resistant cladding layer, further, the flux core accounts for 38-42% of the total weight of the flux-cored wire.

[0015] An application of the flux-cored wire suitable for the high-strength pick no-spark wear-resistant cladding layer, the application of the flux-cored wire suitable for the high-strength pick no-spark wear-resistant cladding layer uses the flux-cored wire suitable for the high-strength pick no-spark wear-resistant cladding layer described in any one of the preceding embodiments.

[0016] In the application of the flux-cored wire suitable for the high-strength pick no-spark wear-resistant cladding layer, further, the application of the flux-cored wire suitable for the high-strength pick no-spark wear-resistant cladding layer comprises the following steps: An arc welding process is adopted, and the protective gas is a mixed gas of argon and carbon dioxide, wherein the volume fraction of carbon dioxide is: 15<CO2≤25, and the balance is argon; Before the build-up welding operation, the pick body is preheated to 250±15℃ and kept for 1-1.25 hours; After the surfacing is completed, the workpiece is subjected to slow cooling treatment, and the deposited layer formed by the flux-cored wire has a thickness of 2.5-3 mm.

[0017] The one or more technical solutions provided in the embodiments of the present application have at least the following beneficial effects: 1. The flux-cored wire for high-strength pick tooth spark-free wear-resistant cladding layer can be used for arc welding under 80% Ar+20% CO2 mixed gas protection, can be used for welding of high-strength pick tooth surface wear-resistant cladding layer, and can realize the combination and matching use of cast tungsten carbide and non-cast tungsten carbide, and the combination and matching use of silicon carbide, boron carbide, ferrosilicon, ferroboron and tungsten powder, so that a multi-element strengthening system is formed, the high hardness and wear resistance of the cladding layer are ensured, the average hardness of the cladding layer is not less than 55HRC, and the hardness of the embodiment can reach about 58HRC.

[0018] 2. The flux-cored wire for high-strength pick tooth spark-free wear-resistant cladding layer can effectively alleviate the welding thermal stress caused by the difference in thermal expansion coefficients of the matrix and hard particles by the combination of cast tungsten carbide and non-cast tungsten carbide in a specific proportion in the formula, significantly inhibits the crack tendency of the cladding layer, and the presence of non-cast tungsten carbide reduces the melting loss of the overall WC particles under the arc, ensuring the persistence and stability of the high-strength pick tooth wear-resistant cladding layer.

[0019] 3. The flux-cored wire for high-strength pick tooth spark-free wear-resistant cladding layer can reduce the interface instantaneous temperature rise and possibly form a surface film with slight self-lubricating effect by the combination and matching use of components such as silicon carbide, boron carbide, ferrosilicon and ferroboron, thereby realizing the spark-free characteristic; and when the pick tooth rubs against ore in the working state, the wear-resistant cladding layer does not generate sparks.

[0020] 4. The flux-cored wire for high-strength pick tooth spark-free wear-resistant cladding layer adopts a specific component nickel-based alloy strip as the outer skin to provide an excellent toughness, crack resistance and corrosion resistance matrix, ensure the stability of the welding process, reduce the crack tendency and tungsten carbide melting, and ensure the performance of the cladding layer. The flux-cored wire is not prone to work hardening during the drawing process, is not prone to breaking, and has a simple production process.

[0021] 5. The flux-cored wire for high-strength pick tooth spark-free wear-resistant cladding layer effectively improves the welding process by adding silicon powder, the arc is stable, the spatter is less, and the weld appearance is beautiful. The process performance and wear resistance of the flux-cored wire are good, the crack tendency is low, there is no spark, and the production process is simple. DETAILED DESCRIPTION

[0022] The embodiment includes a core and a nickel-based alloy strip wrapped outside the core.

[0023] The flux core accounts for 38-42% of the total weight of the welding wire; the flux core includes the following components by weight percentage: 50%-60% cast tungsten carbide particles, 6%-10% non-cast tungsten carbide, 6%-10% silicon carbide and boron carbide, 2-6% ferrosilicon, 4%-10% ferroboron, 2%-6% tungsten powder, 2%-4% silicon micropowder, 2%-6% deoxidizer, 1%-2% fluoride, and the balance of nickel powder.

[0024] The weight percentage ratio of the cast tungsten carbide particles to the non-cast tungsten carbide particles is approximately 5:1 to 10:1.

[0025] The weight percentage ratio of silicon carbide, boron carbide, ferrosilicon, and ferroboron is approximately (3-5):(3-5):(2-6):(4-10), and the content of silicon carbide, boron carbide, ferrosilicon, and ferroboron accounts for approximately 12-26% of the total weight of the core powder.

[0026] in: The weight percentages of each chemical component in the cast tungsten carbide are: W≥95.5%, C≥3.98%, S≤0.01%, P≤0.02%.

[0027] The weight percentages of each chemical component in the non-cast tungsten carbide are: WC ≥ 99.8%, Cl ≤ 0.001%.

[0028] The weight percentage of each chemical component in the silicon carbide is: SiC ≥ 98.0%.

[0029] The weight percentage of each chemical component in the boron carbide is: BC ≥ 95.0%.

[0030] The weight percentages of the chemical components in the ferrosilicon are as follows: Si: 72-80%, S≤0.02%, P≤0.04%.

[0031] The weight percentages of the chemical components in the ferroboron are: B: 19-22%, S≤0.02%, P≤0.04%.

[0032] The weight percentages of each chemical component in the tungsten powder are: W≥99.0%, S≤0.01%, P≤0.004%.

[0033] The weight percentages of each chemical component in the silicon micropowder are: SiO2 ≥ 95.0%, S ≤ 0.04%, P ≤ 0.04%.

[0034] The deoxidizer is an aluminum-magnesium alloy, and the weight percentage of each chemical component in the deoxidizer is: Al: 47-53%, Mg≥47%.

[0035] The fluorides are potassium fluorozirconate and zirconium fluoride, and the weight percentages of each chemical component in the zirconium fluoride are: ZrF4≥95.0%, S≤0.03%, P≤0.03%; the weight percentages of each chemical component in the potassium fluorozirconate are: K2ZrF6≥95.0%, S≤0.03%, P≤0.03%.

[0036] The weight percentages of each chemical component in the nickel powder are: Ni ≥ 99.0%, S ≤ 0.02%, P ≤ 0.01%.

[0037] The weight percentages of the chemical components in the nickel-based alloy strip are as follows: Cr: 9-11%, S≤0.01%, P≤0.01%, with the balance being Ni and unavoidable impurities.

[0038] The nickel-based alloy strip has a chemical composition of 10% Cr and 90% Ni by weight. Its dimensions are 0.35 mm thick and 9.6 mm wide.

[0039] The diameter of the welding wire is φ1.6mm.

[0040] This embodiment enables the overlay of a wear-resistant cladding layer on the surface of a high-strength cutting tooth via arc welding; the average hardness of the cladding layer is not less than 55HRC, and in this embodiment it can reach about 58HRC; when the cutting tooth rubs against the ore in working condition, the wear-resistant cladding layer does not generate sparks.

[0041] How to use: The process is electric arc welding, and the shielding gas is a mixture of 80% argon and 20% carbon dioxide by volume. Before the welding operation, the cutting tooth base needs to be preheated to 250°C and kept at that temperature for 1 hour. After the welding is completed, the workpiece needs to be slowly cooled.

[0042] To better understand the above technical solution, the following will provide a detailed explanation of the technical solution in conjunction with the specification and specific implementation methods.

[0043] Examples 1-5: The flux-cored welding wire of this embodiment includes a flux core and a nickel-based alloy strip covering the outside of the flux core. The flux core accounts for 38-42% of the total weight of the welding wire. The flux core comprises the following components by weight percentage: Table 1. Percentage of Core Components

[0044] The weight percentages of each chemical component in the cast tungsten carbide are: W≥95.5%, C≥3.98%, S≤0.01%, P≤0.02%; the weight percentages of each chemical component in the non-cast tungsten carbide are: WC≥99.8%, Cl≤0.001%; ​​the weight percentages of each chemical component in the silicon carbide are: SiC≥98.0%; the weight percentages of each chemical component in the boron carbide are: BC≥95.0%; the weight percentages of each chemical component in the ferrosilicon are: Si: 72-80%, S≤0.02%, P≤0.04%; the weight percentages of each chemical component in the ferroboron are: B: 19-22%, S≤0.02%, P≤0.04%; the weight percentages of each chemical component in the tungsten powder are: W≥99.0%, S≤0.01%, P≤0.004%; and the weight percentages of each chemical component in the silicon micropowder are: W≥99.0%, S≤0.01%, P≤0.004%. The weight percentages are: SiO2 ≥ 95.0%, S ≤ 0.04%, P ≤ 0.04%; the deoxidizer is an aluminum-magnesium alloy, and the weight percentages of each chemical component in the deoxidizer are: Al: 47-53%, Mg ≥ 47%; the fluoride is potassium fluorozirconate and zirconium fluoride, and the weight percentages of each chemical component in the zirconium fluoride are: ZrF4 ≥ 95.0%, S ≤ 0.03%, P ≤ 0.03%; the weight percentages of each chemical component in the potassium fluorozirconate are: K2ZrF6 ≥ 95.0%, S ≤ 0.03%, P ≤ 0.03%; the weight percentages of each chemical component in the nickel powder are: Ni ≥ 99.0%, S ≤ 0.02%, P ≤ 0.01%; the weight percentages of each chemical component in the nickel-based alloy strip are: Cr: 9-11%, S ≤ 0.01%, P ≤ 0.01%, with the balance being Ni and unavoidable impurities. The diameter of the welding wire is φ1.6mm.

[0045] test: Flux-cored welding wires prepared in Examples 1-5, suitable for the sparkless wear-resistant cladding layer of high-strength cutting teeth, were randomly selected and welded under 80% Ar + 20% CO2 gas protection. The welding voltage was 18-22V, the heat input was 90-120J / mm, and the gas flow rate was 20-25L / min. The welding process performance (weld formation, arc stability, welding spatter rate, etc.) of the flux-cored welding wires was evaluated. The tests showed good arc stability, high weld quality, less spatter, and good process performance. The evaluation results are shown in Table 2. The performance experimental data of the cladding layer deposited on the surface of the high-strength cutting teeth are shown in Table 3.

[0046] Table 2 Evaluation of Welding Process Performance of Welding Wires Prepared in Examples 1-5

[0047] Table 3. Performance of the weld deposit layer after welding with the welding wires prepared in Examples 1-5

[0048] Compared to other examples, Example 1 has a lower amount of cast tungsten carbide but a higher amount of deoxidizer and a higher amount of non-cast tungsten carbide, resulting in higher hardness. The higher amount of non-cast tungsten carbide also results in fewer microcracks. However, due to the lower amount of silicon powder, the arc stability and weld formation are not optimal.

[0049] Compared to other examples, although the amount of cast tungsten carbide added in Example 2 was relatively large, the amount of deoxidizer added was relatively small, and the amounts of silicon carbide, boron carbide, ferrosilicon, and ferroboron were also relatively small, so the hardness did not reach the optimal level; the amount of non-cast tungsten carbide added was relatively small, resulting in a small number of microcracks; the amounts of silicon carbide, boron carbide, ferrosilicon, and ferroboron were also relatively small, so the spark-free effect did not reach the optimal level.

[0050] Compared to other examples, Example 3, although less tungsten powder was added, more silicon carbide, boron carbide, ferrosilicon, and ferroboron were added, resulting in higher hardness; more silicon carbide, boron carbide, ferrosilicon, and ferroboron were added, resulting in the best spark-free effect; more fluoride was added, resulting in very little splashing.

[0051] Compared to other examples, Example 4 has the highest hardness due to the addition of more tungsten powder and a more balanced proportion of other components; however, the addition of less fluoride results in less effective anti-splattering.

[0052] Compared to other examples, Example 5 exhibits the best arc stability and weld formation due to the addition of more silicon micropowder; the proportions of each component are balanced, resulting in higher performance.

[0053] The effects of each component are as follows: Cast tungsten carbide (TCC) particles vs. non-cast tungsten carbide: Cast TCC has high hardness and good wear resistance, but it is brittle and easily becomes a crack initiation point. Insufficient addition results in insufficient wear resistance; excessive addition increases the tendency to crack. Therefore, the percentage of cast TCC in the total weight of the core powder should ideally be 50-60%. Non-cast TCC contains a metallic binder phase, exhibiting better toughness and improved wettability and bonding with the matrix. Using cast and non-cast TCC in a specific ratio allows the non-cast TCC to disperse and release welding thermal stress, effectively reducing microcracks caused by stress concentration around the cast TCC particles and significantly suppressing the cracking tendency of the cladding layer. Furthermore, the different dissolution temperatures of cast and non-cast TCC reduce the overall WC particle dissolution loss. Cast and non-cast TCC together form a multi-layered wear-resistant framework, significantly improving wear resistance and weldability. Too low a ratio results in insufficient wear resistance; too high a ratio increases the tendency to crack. Therefore, the percentage of non-cast tungsten carbide content in the total weight of the core powder should be 6-10%, and the ratio of cast tungsten carbide content to non-cast tungsten carbide content in the total weight of the core powder should be (5-10):1.

[0054] Silicon carbide and boron carbide: Silicon carbide and boron carbide are high-hardness, wear-resistant phases. Furthermore, they possess high thermal conductivity and specific tribological properties, effectively reducing the instantaneous temperature rise at the contact interface during friction, preventing the temperature from reaching the ignition point of rocks and minerals. They are key components in achieving the "spark-free" characteristic. If the proportion is too low, the spark-resistant effect will be insufficient; if the proportion is too high, it may affect the toughness of the cladding layer and the stability of the welding process. Therefore, the percentage of silicon carbide and boron carbide content in the total weight of the core powder should ideally be 6-10%.

[0055] Ferrosilicon and ferroboron: Ferrosilicon acts as a deoxidizer. Ferrosilicon and ferroboron reduce the surface tension and viscosity of the molten pool, improve the fluidity of the molten metal, improve the spreading of the deposited metal, and enhance the bonding with the cutting tool matrix. In addition, this embodiment uses ferrosilicon and ferroboron in combination with silicon carbide and boron carbide as high-hardness reinforcing phases to further refine the cladding layer structure and further suppress spark generation by forming a surface oxide film, thus jointly constructing a hardness and spark-free protection system for the cladding layer. Therefore, the percentage of ferrosilicon content in the total weight of the core powder is preferably 2-6%, and the percentage of ferroboron content in the total weight of the core powder is preferably 4-10%. The weight percentage ratio of silicon carbide, boron carbide, ferrosilicon, and ferroboron is approximately (3-5):(3-5):(2-6):(4-10), and the percentage of silicon carbide, boron carbide, ferrosilicon, and ferroboron in the total weight of the core powder is preferably approximately 12-26%.

[0056] Tungsten powder: During the high-temperature environment of welding, the edges of some tungsten carbide particles dissolve, releasing tungsten and carbon. Introducing an appropriate amount of tungsten powder replenishes the tungsten element in the molten pool. This tungsten powder can combine with carbon in the molten pool or precipitate during subsequent cooling, forming secondary carbides for dispersion strengthening. This compensates for the loss of the hard phase, avoids the decrease in hardness and wear resistance caused by tungsten carbide dissolution, and ensures the reliability of the cladding layer. If the proportion is too low, the strengthening effect will be insufficient; if the proportion is too high, it may affect the toughness of the cladding layer. Therefore, the percentage of tungsten powder content in the total weight of the core powder should be 2-6%.

[0057] Silica powder: It improves arc stability, reduces spatter, and significantly enhances welding processability and weld formation quality. Furthermore, its fine particle size improves flux flowability and allows for adjustment of the flux packing ratio to maintain a suitable flux filling rate. However, excessively high proportions may introduce oxygen into the molten pool. Therefore, the silica powder content should ideally be 2-4% of the total weight of the flux core powder.

[0058] Deoxidizer: A strong deoxidizer used to reduce oxygen in the molten pool and purify the weld metal; it also inhibits the decomposition of tungsten carbide. The deoxidizer is an aluminum-magnesium alloy. The deoxidizer content should ideally be 2-4% of the total weight of the core powder.

[0059] Fluorides: Arc stabilizers, reducing spatter during welding and optimizing the welding process; deoxidizers, inhibiting the decomposition of tungsten carbide; additionally, they can remove hydrogen, reducing crack susceptibility. The deoxidizers are potassium fluorozirconate and zirconium fluoride. The fluoride content should ideally be 1-2% of the total weight of the core powder.

[0060] Nickel powder: As the matrix powder of the core, it works synergistically with the nickel-based outer sheath to form a tough nickel-based alloy matrix for the cladding layer, providing good impact and corrosion resistance and ensuring good wettability with the hard phase. Furthermore, the loose powder ratio is adjusted to maintain a suitable powder filling rate.

[0061] Nickel-based alloy strip: As the outer sheath of the welding wire, the nickel in it provides an excellent toughness, crack resistance, and corrosion resistance matrix. Chromium ensures the strength of the alloy strip, guarantees the reliability of mass production, and improves the straightness of the welding wire, which is beneficial for wire feeding and ensures the stability of the welding process and the performance of the cladding layer. However, excessive chromium content may lead to the formation of brittle chromium carbides, which on the one hand increases the tendency to crack, and on the other hand promotes the melting of tungsten carbide, reducing the performance of the cladding layer. Therefore, the chromium content in the nickel-based alloy strip should ideally be 9-11% of the total weight of the nickel-based alloy strip.

[0062] This embodiment can obtain a wear-resistant cladding layer for cutting teeth that combines high hardness, high wear resistance, high crack resistance, and spark-free characteristics. Its comprehensive performance is significantly better than that of the prior art, and it is suitable for flux-cored welding wires for high-strength cutting teeth with spark-free wear-resistant cladding.

[0063] In summary, the present invention provides a flux-cored welding wire suitable for the sparkless wear-resistant cladding layer of high-strength cutting teeth.

[0064] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A flux-cored welding wire suitable for sparkless wear-resistant cladding of high-strength cutting teeth, characterized in that: The flux-cored welding wire suitable for high-strength cutting teeth with sparkless wear-resistant cladding includes a flux core, which comprises the following components by weight percentage: 50%-60% cast tungsten carbide particles and 6%-10% non-cast tungsten carbide, wherein the weight percentage of cast tungsten carbide particles to non-cast tungsten carbide is 5:1 to 10:

1.

2. The flux-cored welding wire suitable for high-strength cutting teeth with sparkless wear-resistant cladding as described in claim 1, characterized in that: The weight percentages of each chemical component in the cast tungsten carbide are: W≥95.5%, C≥3.98%, S≤0.01%, P≤0.02%, and the weight percentages of each chemical component in the non-cast tungsten carbide are: WC≥99.8%, Cl≤0.001%.

3. The flux-cored welding wire suitable for high-strength cutting teeth with sparkless wear-resistant cladding as described in claim 1, characterized in that: The core also includes the following components by weight percentage: 6%-10% silicon carbide and boron carbide, 2-6% ferrosilicon, and 4%-10% ferroboron, wherein the total weight of silicon carbide, boron carbide, ferrosilicon, and ferroboron accounts for 12-26% of the total weight of the core.

4. The flux-cored welding wire suitable for high-strength cutting teeth with sparkless wear-resistant cladding as described in claim 3, characterized in that: The weight percentage of each chemical component in the silicon carbide is: SiC ≥ 98.0%; The weight percentage of each chemical component in the boron carbide is: BC ≥ 95.0%; The weight percentages of the chemical components in the ferrosilicon are as follows: Si: 72-80%, S≤0.02%, P≤0.04%; The weight percentages of each chemical component in the ferroboron are: B: 19-22%, S≤0.02%, P≤0.04%.

5. The flux-cored welding wire suitable for high-strength cutting teeth with sparkless wear-resistant cladding as described in claim 3, characterized in that: The core also includes the following components by weight percentage: 2%-6% tungsten powder, 2%-4% silicon micro powder, 2%-6% deoxidizer, 1%-2% fluoride, and the balance being nickel powder. in: The weight percentages of each chemical component in the tungsten powder are: W ≥ 99.0%, S ≤ 0.01%, P ≤ 0.004%; The weight percentages of each chemical component in the silicon micropowder are: SiO2 ≥ 95.0%, S ≤ 0.04%, P ≤ 0.04%; The deoxidizer is an aluminum-magnesium alloy, and the weight percentage of each chemical component in the aluminum-magnesium alloy is: Al: 47-53%, Mg≥47%; The fluoride is potassium fluorozirconate and zirconium fluoride, wherein the weight percentage of each chemical component in the potassium fluorozirconate is: K2ZrF6≥95.0%, S≤0.03%, P≤0.03%, and the weight percentage of each chemical component in the zirconium fluoride is: ZrF4≥95.0%, S≤0.03%, P≤0.03%. The weight percentages of each chemical component in the nickel powder are: Ni ≥ 99.0%, S ≤ 0.02%, P ≤ 0.01%.

6. The flux-cored welding wire suitable for high-strength cutting teeth with sparkless wear-resistant cladding as described in claim 1, characterized in that: The flux-cored wire suitable for high-strength cutting teeth with sparkless wear-resistant cladding also includes a nickel-based alloy strip covering the outside of the flux core.

7. The flux-cored welding wire suitable for high-strength cutting teeth with sparkless wear-resistant cladding as described in claim 6, characterized in that: The weight percentages of each chemical component in the nickel-based alloy strip are as follows: Cr: 9-11%, S≤0.01%, P≤0.01%, with the balance being Ni and unavoidable impurities.

8. The flux-cored welding wire suitable for high-strength cutting teeth with sparkless wear-resistant cladding as described in claim 1, characterized in that: The weight of the flux core accounts for 38-42% of the total weight of the flux-cored welding wire.

9. An application of a flux-cored welding wire suitable for a sparkless, wear-resistant cladding layer on high-strength cutting teeth, characterized in that: The application of the flux-cored wire suitable for the non-sparking wear-resistant cladding layer of high-strength cutting teeth uses the flux-cored wire suitable for the non-sparking wear-resistant cladding layer of high-strength cutting teeth as described in any one of claims 1-8.

10. The application of the flux-cored welding wire for high-strength cutting teeth with sparkless wear-resistant cladding as described in claim 9, characterized in that: The application of the flux-cored welding wire suitable for high-strength cutting teeth with sparkless and wear-resistant cladding includes the following steps: The process is electric arc welding, and the shielding gas is a mixture of argon and carbon dioxide, wherein the volume fraction of carbon dioxide is 15 < CO2 ≤ 25, and the balance is argon. Before the welding operation, preheat the cutting tooth substrate to 250±15℃ and keep it at that temperature for 1-1.25 hours; After the welding is completed, the workpiece is subjected to slow cooling treatment, and the thickness of the cladding layer formed by the flux-cored welding wire is 2.5-3mm.

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