WC ceramic particle reinforced titanium matrix composite material cored wire and preparation method thereof

Abstract

The WC ceramic phase reinforced titanium-based gas shielded flux-cored wire disclosed by the application comprises a flux core and a welding sheath, wherein the flux core comprises the following components in percentage by mass: WC: 40-60%, Ni: 10-16%, Al: 5-12%, Cr: 5-10%, Si: 0.1-0.5%, and the balance is titanium powder, and the sum of the mass percentages of the above component contents is 100%; the application further discloses a preparation method of the WC ceramic phase reinforced titanium-based gas shielded flux-cored wire; and the flux-cored wire is suitable for surface modification of titanium alloy and solves the problems of low hardness and poor wear resistance of TC32 titanium alloy.

Description

Technical Field

[0001] This invention belongs to the field of titanium alloy surface modification technology, and relates to flux-cored welding wire for WC ceramic particle reinforced titanium matrix composite materials.

[0002] The present invention also relates to a method for preparing flux-cored welding wire for WC ceramic particle reinforced titanium matrix composites. Background Technology

[0003] Titanium and its alloys possess excellent comprehensive properties such as high specific strength, good corrosion resistance, high temperature resistance, and good biocompatibility, making them important materials in aerospace, petrochemical, military manufacturing, and medical industries. However, titanium and titanium alloys have high chemical reactivity, a high coefficient of friction, low hardness, poor wear resistance, and are difficult to process and smelt. Furthermore, titanium alloys are prone to combustion under high-temperature, high-speed friction, forming "titanium fire." These drawbacks severely hinder the use of titanium alloys as structural components and friction parts, significantly limiting their further application as structural materials. Currently, with breakthroughs in aerospace, marine engineering, and other fields, traditional titanium alloy materials can no longer meet the harsh operating environments. Therefore, to improve the wear resistance, oxidation resistance, and surface hardness of titanium-based materials, a ceramic hard phase is added to the titanium alloy matrix to prepare a ceramic phase-reinforced titanium-based composite material. This improves the wear resistance and other defects of titanium alloys, extending their service life under harsh conditions. Summary of the Invention

[0004] The purpose of this invention is to provide flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composites, which solves the problems of poor wear resistance and low hardness of existing titanium alloys.

[0005] Another object of the present invention is to provide a method for preparing flux-cored welding wire for WC ceramic particle reinforced titanium matrix composites.

[0006] The first technical solution adopted in this invention is a flux-cored welding wire for WC ceramic particle reinforced titanium matrix composite material, comprising a flux core and a welding sheath. The flux core comprises, by mass percentage: WC: 40%–60%, Ni: 10%–16%, Al: 5%–12%, Cr: 5%–10%, Si: 0.1%–0.5%, with the balance being titanium powder. The sum of the mass percentages of the above components is 100%.

[0007] The first technical solution of this invention is also characterized by:

[0008] The welding material is TA1 titanium strip;

[0009] The flux-cored wire has a flux filling rate of 26wt% to 30wt%.

[0010] The second technical solution adopted in this invention is a method for preparing WC ceramic phase reinforced titanium-based gas-shielded flux-cored welding wire, which uses WC ceramic particle reinforced titanium-based composite flux-cored welding wire, and is implemented according to the following steps:

[0011] Step 1: Clean the TA1 titanium strip;

[0012] Step 2: Weigh each component according to its mass percentage;

[0013] Step 3: Dry mix the components weighed in Step 2 to obtain the core powder;

[0014] Step 4: Prepare welding wire using a flux-cored welding wire making machine to obtain titanium alloy flux-cored welding wire precursor;

[0015] Step 5: The titanium alloy flux-cored welding wire precursor obtained in Step 4 is subjected to cold drawing, diameter reduction, wire drawing, and annealing.

[0016] Step 6: Clean the welding wire obtained in Step 5 to obtain the flux-cored welding wire for WC ceramic particle reinforced titanium matrix composite material.

[0017] The second technical solution of the present invention is further characterized by:

[0018] The cleaning process in step 1 is as follows: First, the titanium strip is cleaned with a mixture of NaOH and acetone, then cleaned with water, and finally ultrasonically cleaned with a mixture of HF and HNO3 to obtain the cleaned TA1 titanium strip.

[0019] The mixture of NaOH and acetone contains 15% NaOH and 85% acetone by mass; the mixture of HF and HNO3 contains 5% HF and 35% HNO3 by mass; ultrasonic cleaning is performed for 1–2 minutes at a frequency of 20–30 kHz.

[0020] Step 3 specifically involves the following: The core material weighed in step 2 comprises, by mass percentage: WC: 40%–60%, Ni: 10%–16%, Al: 5%–12%, Cr: 5%–10%, Si: 0.1%–0.5%, with the remainder being titanium powder. The sum of the mass percentages of the above components is 100%. The above components are heated, and then the raw material powders of each component are dry-mixed in a mixer until they are uniformly mixed to obtain core powder. The particle size of each raw material powder is no greater than 124 μm.

[0021] Step 4 specifically involves: wrapping the uniformly mixed flux powder from step 3 into a TA1 titanium strip using a flux-cored wire forming machine, and then closing the TA1 titanium strip using a forming machine to obtain a titanium alloy flux-cored wire precursor with a diameter of 2.1 mm.

[0022] Step 5 specifically involves: subjecting the titanium alloy flux-cored welding wire precursor obtained in step 4 to multiple cold drawing and diameter reduction dies, and performing stress-relief annealing after each of the three cold drawing and diameter reduction dies to obtain a welding wire with a diameter of 1.6 mm.

[0023] The specific process of multi-pass cold drawing and diameter reduction wire drawing die is as follows: the wire is passed through drawing dies with diameters of 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence, and the stress relief annealing time is 60 to 90 minutes and the temperature is 600 to 650℃.

[0024] Step 6 specifically involves wiping the oil stains on the welding wire obtained in step 5 with a cotton cloth soaked in acetone or anhydrous ethanol, and finally straightening the welding wire, coiling it into a disc, and sealing it for packaging using a wire drawing machine.

[0025] The beneficial effects of this invention are:

[0026] The WC ceramic phase reinforced titanium-based gas-shielded flux-cored wire of the present invention has the following advantages:

[0027] (1) The gas-shielded flux-cored welding wire of the present invention is used to address the surface modification problem of titanium alloys, and solves the problems of poor wear resistance and low hardness of titanium alloys;

[0028] (2) The gas-shielded flux-cored welding wire of the present invention has excellent arc cladding properties, stable arc, good wetting and spreading performance, beautiful weld formation, and no defects such as cracks, porosity, inclusions, or oxidation.

[0029] The preparation method of WC ceramic phase reinforced titanium-based gas-shielded flux-cored wire of the present invention has the characteristics of simple process, strong operability, low cost and suitability for mass production. Attached Figure Description

[0030] Figure 1 This is a metallographic microstructure of the TC32 titanium alloy surface modified by the gas-shielded flux-cored wire prepared in Example 4 of the preparation method of WC ceramic phase reinforced titanium-based gas-shielded flux-cored wire of the present invention under TIG cladding conditions. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] This invention provides a WC ceramic phase reinforced titanium-based gas-shielded flux-cored wire, comprising a flux core and a welding sheath, wherein the flux core comprises, by mass percentage: WC: 40%–60%, Ni: 10%–16%, Al: 5%–12%, Cr: 5%–10%, Si: 0.1%–0.5%, with the balance being titanium powder, and the sum of the mass percentages of the above components is 100%.

[0033] The welding wire is made of TA1 titanium strip with a size of 7mm × 0.2mm. The flux-cored wire has a flux filling rate of 26wt% to 30wt%.

[0034] The functions of each component in the core powder are:

[0035] Ti: Titanium can act as a deoxidizer, reduce dissolved nitrogen, refine grains, and a certain amount of titanium is beneficial to improving the plasticity and toughness of weld metal.

[0036] WC: WC particles have the characteristics of high hardness and high melting point. The coefficient of thermal expansion is close to that of titanium alloys. The interfacial reaction between WC and Ti melt is mild at high temperatures. WC is considered an ideal reinforcing agent for titanium alloys.

[0037] Ni: It is a β-stabilizing element in TC32 titanium alloy. Compounds can also be formed between titanium and nickel, such as Ti2Ni, Ti3Ni, TiNi, etc. Nickel-titanium compounds have better plasticity and can withstand greater deformation without cracking. This can improve the bonding strength of the composite structure interface and prevent the interface from cracking prematurely during deformation.

[0038] Al: It is an α-stabilizing element in TC32 titanium alloy. Adding Al can increase the strength and toughness of the welded joint, resulting in a high-strength and high-toughness joint.

[0039] Cr: It belongs to the β-stabilizing element in TC32 titanium alloy. It has excellent oxidation resistance and corrosion resistance. It can react with the O element in the air or surface contact medium to form a dense oxide film, which prevents the alloy matrix from further contacting and reacting with the corrosive medium. The higher the Cr content, the better the oxidation resistance and corrosion resistance of the alloy.

[0040] Si: Silicon has the function of deoxidation and improving the strength of the weld metal. However, Si has a strong solid solution strengthening effect, which will lead to a decrease in the low-temperature toughness of the weld metal. Therefore, the content of added Si should be reasonably controlled.

[0041] This invention also provides a method for preparing WC ceramic phase reinforced titanium-based gas-shielded flux-cored welding wire, specifically implemented according to the following steps:

[0042] Step 1: First, clean the titanium strip with a mixture of NaOH and acetone, then rinse with water, and finally ultrasonically clean it with a mixed aqueous solution of HF and HNO3 to obtain the cleaned TA1 titanium strip. The NaOH and acetone mixture used has a NaOH mass fraction of 15% and an acetone mass fraction of 85%. The mixed aqueous solution of HF and HNO3 has a HF mass fraction of 5% and an HNO3 mass fraction of 35%. Ultrasonic cleaning is performed for 1–2 minutes at a frequency of 20–30 kHz.

[0043] Step 2: Weigh out the following components by mass percentage: WC: 40%–60%, Ni: 10%–16%, Al: 5%–12%, Cr: 5%–10%, Si: 0.1%–0.5%, with the remainder being titanium powder. The sum of the mass percentages of the above components shall be 100%. The particle size of each raw material powder shall not exceed 124 μm.

[0044] Step 3: Dry mix the heated raw material powders from Step 2 in a mixer until they are evenly mixed to obtain core powder.

[0045] Step 4: The flux-cored powder uniformly mixed in Step 3 is wrapped in TA1 titanium strip using a flux-cored wire forming machine, and the TA1 titanium copper strip is closed using a forming machine to obtain a titanium alloy flux-cored wire precursor with a diameter of 2.1 mm.

[0046] Step 5: The TA1 titanium alloy flux-cored welding wire precursor with a diameter of 2.1 mm obtained in Step 4 is subjected to multiple cold drawing and diameter reduction dies. After each cold drawing and diameter reduction die is performed three times, stress-relief annealing is performed to obtain a welding wire with a diameter of 1.6 mm.

[0047] The specific process of multi-pass cold drawing and diameter reduction wire drawing die is as follows: the wire is passed through drawing dies with diameters of 2.0mm, 1.9mm, 1.8mm, 1.7mm and 1.6mm in sequence, and the stress relief annealing time is 60 to 90 minutes and the temperature is 600 to 650℃.

[0048] Step 6: Wipe the oil stains on the welding wire with a cotton cloth soaked in acetone or anhydrous ethanol, then dry it, coil it into a disc, and seal it for packaging.

[0049] Example 1

[0050] Step 1: First, clean the titanium strip with a mixture of NaOH and acetone, then rinse with water, and finally use a mixed aqueous solution of HF and HNO3 for ultrasonic cleaning to obtain the cleaned TA1 titanium strip.

[0051] The NaOH and acetone mixture used had a NaOH mass fraction of 15% and an acetone mass fraction of 85%; the HF and HNO3 mixed aqueous solution had a HF mass fraction of 5% and an HNO3 mass fraction of 35%; ultrasonic cleaning was performed for 2 minutes at a frequency of 30 kHz.

[0052] Step 2: Weigh out the following components by mass percentage: WC: 40%, Ni: 10%, Al: 5%, Cr: 5%, Si: 0.1%, with the remainder being titanium powder. The sum of the mass percentages of the above components shall be 100%. The particle size of each raw material powder shall not exceed 124 μm.

[0053] Step 3: Dry mix the heated raw material powders from Step 2 in a mixer until they are evenly mixed to obtain core powder.

[0054] Step 4: The flux-cored powder uniformly mixed in Step 3 is wrapped in TA1 titanium strip using a flux-cored wire forming machine, and the TA1 titanium strip is closed using a forming machine to obtain a titanium alloy flux-cored wire precursor with a diameter of 2.1 mm.

[0055] Step 5: The TA1 titanium alloy flux-cored welding wire precursor with a diameter of 2.1 mm obtained in Step 4 is subjected to multiple cold drawing and diameter reduction dies. After each cold drawing and diameter reduction die is performed three times, stress-relief annealing is performed to obtain a welding wire with a diameter of 1.6 mm.

[0056] The specific process of the multi-pass cold drawing and diameter reduction wire drawing die is as follows: the wire passes sequentially through drawing dies with diameters of 2.0mm, 1.9mm, 1.8mm, 1.7mm, and 1.6mm. The stress-relief annealing time is 60 minutes, and the temperature is 650℃.

[0057] Step 6: Wipe the oil stains on the welding wire with a cotton cloth soaked in acetone or anhydrous ethanol, then dry it, coil it into a disc, and seal it for packaging.

[0058] The arc cladding process of the gas-shielded flux-cored welding wire prepared in Example 1 was as follows: Tungsten inert gas (TIG) welding was used, with a welding current of 120–140 A, a voltage of 10–15 V, a welding speed of 0.3–0.4 m / min, and pure argon as the shielding gas. During cladding, the arc was stable, the weld formation was aesthetically pleasing, and there were no defects such as porosity, cracks, inclusions, or oxidation. The maximum hardness of the obtained titanium-based cladding layer was 500 HV. 0.2 Its hardness is increased by 42% compared with the base material, and the resulting cladding layer has excellent wear resistance and meets the application requirements.

[0059] Example 2

[0060] Step 1: First, clean the titanium strip with a mixture of NaOH and acetone, then rinse with water, and finally use a mixed aqueous solution of HF and HNO3 for ultrasonic cleaning to obtain the cleaned TA1 titanium strip.

[0061] The NaOH and acetone mixture used contained 15% NaOH and 85% acetone by mass. The HF and HNO3 aqueous solution contained 5% HF and 35% HNO3 by mass. Ultrasonic cleaning was performed for 1 min at a frequency of 30 kHz.

[0062] Step 2: Weigh out the following components by mass percentage: WC: 45%, Ni: 12%, Al: 8%, Cr: 6%, Si: 0.2%, with the remainder being titanium powder. The sum of the mass percentages of the above components shall be 100%. The particle size of each raw material powder shall not exceed 124 μm.

[0063] Step 3: Dry mix the heated raw material powders from Step 2 in a mixer until they are evenly mixed to obtain core powder.

[0064] Step 4: The flux-cored powder uniformly mixed in Step 3 is wrapped in TA1 titanium strip using a flux-cored wire forming machine, and the TA1 titanium strip is closed using a forming machine to obtain a titanium alloy flux-cored wire precursor with a diameter of 2.1 mm.

[0065] Step 5: The TA1 titanium alloy flux-cored welding wire precursor with a diameter of 2.1 mm obtained in Step 4 is subjected to multiple cold drawing and diameter reduction dies. After each cold drawing and diameter reduction die is performed three times, stress-relief annealing is performed to obtain a welding wire with a diameter of 1.6 mm.

[0066] The specific process of the multi-pass cold drawing and diameter reduction wire drawing die is as follows: the wire passes sequentially through drawing dies with diameters of 2.0mm, 1.9mm, 1.8mm, 1.7mm, and 1.6mm. The stress-relief annealing time is 90 minutes, and the temperature is 600℃.

[0067] Step 6: Wipe the oil stains on the welding wire with a cotton cloth soaked in acetone or anhydrous ethanol, then dry it, coil it into a disc, and seal it for packaging.

[0068] The arc cladding process of the gas-shielded flux-cored welding wire prepared in Example 2 is as follows: Tungsten inert gas (TIG) welding is used, with a welding current of 120–140 A, a voltage of 10–15 V, a welding speed of 0.3–0.4 m / min, and pure argon as the shielding gas. During cladding, the arc is stable, the weld formation is aesthetically pleasing, and there are no defects such as porosity, cracks, or inclusions. The maximum hardness of the obtained titanium-based cladding layer is 510 HV. 0.2 Its hardness is increased by 45% compared with the base material, and the resulting cladding layer has excellent wear resistance and meets the requirements for use.

[0069] Example 3

[0070] Step 1: First, clean the titanium strip with a mixture of NaOH and acetone, then rinse with water, and finally use a mixed aqueous solution of HF and HNO3 for ultrasonic cleaning to obtain the cleaned TA1 titanium strip.

[0071] The NaOH and acetone mixture used contained 15% NaOH and 85% acetone by mass. The HF and HNO3 aqueous solution contained 5% HF and 35% HNO3 by mass. Ultrasonic cleaning was performed for 1 min at a frequency of 30 kHz.

[0072] Step 2: Weigh out the following components by mass percentage: WC: 50%, Ni: 14%, Al: 10%, Cr: 8%, Si: 0.3%, with the remainder being titanium powder. The sum of the mass percentages of the above components shall be 100%. The particle size of each raw material powder shall not exceed 124 μm.

[0073] Step 3: Dry mix the heated raw material powders from Step 2 in a mixer until they are evenly mixed to obtain core powder.

[0074] Step 4: The flux-cored powder uniformly mixed in Step 3 is wrapped in TA1 titanium strip using a flux-cored wire forming machine, and the TA1 titanium strip is closed using a forming machine to obtain a titanium alloy flux-cored wire precursor with a diameter of 2.1 mm.

[0075] Step 5: The TA1 titanium alloy flux-cored welding wire precursor with a diameter of 2.1 mm obtained in Step 4 is subjected to multiple cold drawing and diameter reduction dies. After each cold drawing and diameter reduction die is performed three times, stress-relief annealing is performed to obtain a welding wire with a diameter of 1.6 mm.

[0076] The specific process of the multi-pass cold drawing and diameter reduction wire drawing die is as follows: the wire passes sequentially through drawing dies with diameters of 2.0mm, 1.9mm, 1.8mm, 1.7mm, and 1.6mm. The stress-relief annealing time is 80 minutes, and the temperature is 620℃.

[0077] Step 6: Wipe the oil stains on the welding wire with a cotton cloth soaked in acetone or anhydrous ethanol, then dry it, coil it into a disc, and seal it for packaging.

[0078] The cladding process of the gas-shielded flux-cored welding wire prepared in Example 3 is as follows: Tungsten inert gas (TIG) welding is used, with a welding current of 120–140 A, a voltage of 10–15 V, a welding speed of 0.3–0.4 m / min, and pure argon as the shielding gas. During cladding, the arc is stable, the weld formation is aesthetically pleasing, and there are no defects such as porosity, cracks, or inclusions. The maximum hardness of the obtained titanium-based cladding layer is 512 HV. 0.2 Its hardness is increased by 46% compared with the base material, and the resulting cladding layer has excellent wear resistance and meets the application requirements.

[0079] Example 4

[0080] Step 1: First, clean the titanium strip with a mixture of NaOH and acetone, then rinse with water, and finally use a mixed aqueous solution of HF and HNO3 for ultrasonic cleaning to obtain the cleaned TA1 titanium strip.

[0081] The NaOH and acetone mixture used contained 15% NaOH and 85% acetone by mass. The HF and HNO3 mixture contained 5% HF and 35% HNO3 by mass. Ultrasonic cleaning was performed for 2 minutes at a frequency of 20 kHz.

[0082] Step 2: Weigh out WC: 60%, Ni: 16%, Al: 12%, Cr: 10%, Si: 0.4% by mass percentage, with the remainder being titanium powder. The sum of the mass percentages of the above components shall be 100%. The particle size of each raw material powder shall not exceed 124 μm.

[0083] Step 3: Dry mix the heated raw material powders from Step 2 in a mixer until they are evenly mixed to obtain core powder.

[0084] Step 4: The flux-cored powder uniformly mixed in Step 3 is wrapped in TA1 titanium strip using a flux-cored wire forming machine, and the TA1 titanium copper strip is closed using a forming machine to obtain a titanium alloy flux-cored wire precursor with a diameter of 2.1 mm.

[0085] Step 5: The TA1 titanium alloy flux-cored welding wire precursor with a diameter of 2.1 mm obtained in Step 4 is subjected to multiple cold drawing and diameter reduction dies. After each cold drawing and diameter reduction die is performed three times, stress-relief annealing is performed to obtain a welding wire with a diameter of 1.6 mm.

[0086] The specific process of multi-pass cold drawing and diameter reduction wire drawing dies is as follows: the wire passes sequentially through drawing dies with diameters of 2.0mm, 1.9mm, 1.8mm, 1.7mm, and 1.6mm. The stress-relief annealing time is 60–60 minutes, and the temperature is 600–650℃.

[0087] Step 6: Wipe the oil stains on the welding wire with a cotton cloth soaked in acetone or anhydrous ethanol, then dry it, coil it into a disc, and seal it for packaging.

[0088] The cladding process of the gas-shielded flux-cored welding wire prepared in Example 4 is as follows: Tungsten inert gas (TIG) welding is used, with a welding current of 120–140 A, a voltage of 10–15 V, a welding speed of 0.3–0.4 m / min, and pure argon as the shielding gas. During cladding, the arc is stable, the weld formation is aesthetically pleasing, and there are no defects such as porosity, cracks, or inclusions. The maximum hardness of the obtained titanium-based cladding layer is 550 HV. 0.2 Its hardness was increased by 57% compared to the base material, and the resulting cladding layer exhibited excellent wear resistance, meeting the application requirements; metallographic observation of the obtained titanium-based cladding layer showed that... Figure 1 As shown, Figure 1 The microstructure of the bottom and middle part of the cladding layer is shown in the microstructure image. Undecomposed WC particles, as well as fine TiC and W2C particles generated by the reaction, can be observed in the cladding layer. These structures greatly improve the hardness and wear resistance of the cladding layer.

Claims

1. A flux-cored welding wire for WC ceramic particle-reinforced titanium-based composite materials, comprising a flux core and a welding sheath, characterized in that, The core contains, by mass percentage: WC: 40%~60%, Ni: 10%~16%, Al: 5%~12%, Cr: 5%~10%, Si: 0.1%~0.5%, with the balance being titanium powder. The sum of the mass percentages of the above components is 100%.

2. The flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composite materials according to claim 1, characterized in that, The welding surface is TA1 titanium strip.

3. The flux-cored welding wire for WC ceramic particle-reinforced titanium-based composite materials according to claim 1, characterized in that, The flux-cored wire has a flux filling rate of 26wt%~30wt%.

4. A method for preparing flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composites, comprising preparing the flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composites as described in any one of claims 1 to 3, characterized in that, The specific steps are as follows: Step 1: Clean the TA1 titanium strip; Step 2: Weigh each component according to its mass percentage; Step 3: Dry mix the components weighed in Step 2 to obtain the core powder; Step 4: Prepare welding wire using a flux-cored welding wire making machine to obtain titanium alloy flux-cored welding wire precursor; Step 5: The titanium alloy flux-cored welding wire precursor obtained in Step 4 is subjected to cold drawing, diameter reduction, wire drawing, and annealing. Step 6: Clean the welding wire obtained in Step 5 to obtain the flux-cored welding wire for WC ceramic particle reinforced titanium matrix composite material.

5. The method for preparing the flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composite materials according to claim 4, characterized in that, The cleaning process in step 1 is as follows: First, the titanium strip is cleaned with a mixture of NaOH and acetone, then rinsed with water, and finally ultrasonically cleaned with a mixed aqueous solution of HF and HNO3 to obtain the cleaned TA1 titanium strip.

6. The method for preparing the flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composite materials according to claim 5, characterized in that, The mixture of NaOH and acetone has a NaOH mass fraction of 15% and an acetone mass fraction of 85%; the mixture of HF and HNO3 has a HF mass fraction of 5% and an HNO3 mass fraction of 35%; ultrasonic cleaning is performed for 1-2 minutes at an ultrasonic frequency of 20-30 kHz.

7. The method for preparing the flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composite materials according to claim 4, characterized in that, Step 3 specifically involves the following: The core material weighed in step 2 comprises, by mass percentage: WC: 40%~60%, Ni: 10%~16%, Al: 5%~12%, Cr: 5%~10%, Si: 0.1%~0.5%, with the remainder being titanium powder. The sum of the mass percentages of the above components is 100%. The above components are heated, and then the raw material powders of each component are dry-mixed in a mixer until they are uniformly mixed to obtain core powder. The particle size of each raw material powder is no greater than 124 μm.

8. The method for preparing the flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composite materials according to claim 4, characterized in that, Step 4 specifically involves: wrapping the uniformly mixed flux powder from step 3 into a TA1 titanium strip using a flux-cored wire forming machine, and then closing the TA1 titanium strip using a forming machine to obtain a titanium alloy flux-cored wire precursor with a diameter of 2.1 mm.

9. The method for preparing the flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composite materials according to claim 4, characterized in that, Step 5 specifically involves: subjecting the titanium alloy flux-cored welding wire precursor obtained in step 4 to multiple cold drawing and diameter reduction dies, and performing stress-relief annealing after each of the three cold drawing and diameter reduction dies to obtain a welding wire with a diameter of 1.6 mm. The specific process of the multi-pass cold drawing and diameter reduction wire drawing die is as follows: the wires are passed through drawing dies with diameters of 2.0 mm, 1.9 mm, 1.8 mm, 1.7 mm and 1.6 mm in sequence, and the stress-relieving annealing time is 60~90 min, and the temperature is 600~650℃.

10. The method for preparing the flux-cored welding wire for WC ceramic particle-reinforced titanium matrix composite materials according to claim 4, characterized in that, Step 6 specifically involves wiping the oil stains on the welding wire obtained in step 5 with a cotton cloth soaked in acetone or anhydrous ethanol, and finally straightening the welding wire, coiling it into a disc, and sealing it for packaging using a wire drawing machine.

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