Cladding repair process based on laser beam high-frequency swing powder feeding

Abstract

The invention provides a cladding repair process based on high-frequency swing powder feeding of a laser beam. The cladding repair process comprises the steps that a base material area of a to-be-repaired part is preheated; melting and solidifying the repair powder conveyed to the base material area by using a laser beam according to a set path for multiple times to form a plurality of transition layers; melting and solidifying the repair powder conveyed to the transition layer again according to the set path by using the laser beam to form an additive layer; wherein the set path is spiral swing, the swing frequency of the laser beam is 500-1000 Hz, and the repairing powder comprises iron-based alloy powder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser additive manufacturing, in particular to a cladding repair process based on high-frequency wobbling powder feeding of a laser beam. BACKGROUND

[0002] At present, key components (such as gas turbine blades) of heavy-duty equipment need to serve in high-temperature and high-pressure environments for a long time. The laser cladding process in the related art causes stress concentration, which leads to cracks and substrate deformation in the repair area. In addition, gas escapes insufficiently during the solidification process of the molten pool, resulting in a high porosity rate, which affects the compactness of the repair layer and leads to poor service life of the repaired components. SUMMARY

[0003] The present application aims to at least solve one of the problems in the prior art or related art.

[0004] To this end, the present application provides, in a first aspect, a cladding repair process based on high-frequency wobbling powder feeding of a laser beam.

[0005] Therefore, according to the first aspect of the present application, a cladding repair process based on high-frequency wobbling powder feeding of a laser beam is provided, which comprises: preheating a substrate area of a component to be repaired; using a laser beam to melt and solidify repair powder delivered to the substrate area according to a set path to form a multi-layer transition layer; using a laser beam to melt and solidify repair powder delivered to the transition layer according to a set path to form an additive layer; wherein the set path is a spiral wobble, the wobble frequency of the laser beam is 500Hz-1000Hz, and the repair powder comprises iron-based alloy powder.

[0006] The cladding repair process based on high-frequency wobbling powder feeding of a laser beam provided by the present application can increase the lateral disturbance of the molten pool, accelerate the escape of the molten pool gas, break the columnar crystal growth, and convert the transition layer grains from columnar crystals to equiaxed crystals, thereby significantly improving the impact toughness of the repair area, reducing the generation of cracks and deformation in the repair area, achieving the synergistic optimization of geometric accuracy and mechanical properties during the laser additive repair process, suppressing residual stress and deformation, meeting the remanufacturing requirements of high precision and low defects, and improving the service reliability of the repaired components.

[0007] Since the repair powder comprises iron-based alloy powder, a dispersion structure of cryptocrystalline martensite matrix and nanocarbide can be obtained in the additive layer, which improves the hardness of the repair area and reduces the crack rate of the repair area.

[0008] Optionally, the component to be repaired can be a key component of heavy-duty equipment, for example, a gas turbine blade.

[0009] In some embodiments, the EBSD detector is used to scan the solidified transition layer, and the frequency of the laser beam is increased or the scanning speed of the laser beam is decreased when the columnar crystal is still present in the transition layer.

[0010] In some embodiments, the multi-layer transition layer comprises a first layer, a second layer and a third layer in sequence, the first layer is close to the base material area, the power of the laser beam used to form the first layer, the second layer and the third layer is decreased in sequence, and the scanning speed is decreased in sequence.

[0011] In some embodiments, the power of the laser beam used to form the first layer is 2.5kW, and the scanning speed is 12mm / s; the power of the laser beam used to form the second layer is 2.0kW, and the scanning speed is 10mm / s; the power of the laser beam used to form the third layer is 1.5kW, and the scanning speed is 8mm / s.

[0012] In some embodiments, the temperature of the preheating treatment is 300-400℃.

[0013] In some embodiments, the base material area after the preheating treatment is subjected to a heat preservation treatment, and the heat preservation time is 8-12min.

[0014] In some embodiments, the components of the iron-based alloy powder include Fe, Cr, Ni, W and Ti, wherein the content of Cr is 18%, the content of Ni is 8%, the content of W is 5%, the content of Ti is 1.5%, and the rest is Fe.

[0015] In some embodiments, the power of the laser beam is 2.5-3.5kW, the scanning speed is 12-18mm / s, the powder feeding rate is 12-18g / min, and the cooling rate is greater than 10 4 ℃ / s.

[0016] In some embodiments, the frequency of the laser beam is determined according to the material of the component to be repaired.

[0017] In some embodiments, when the material of the component to be repaired is a low-melting-point material, the frequency of the laser beam is determined to be 500-600Hz; when the material of the component to be repaired is a steel matrix material, the frequency of the laser beam is determined to be 600-800Hz; and when the material of the component to be repaired is a high-melting-point material, the frequency of the laser beam is determined to be 800-1000Hz.

[0018] Additional aspects and advantages of the present application will become apparent from the following description section, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings of which: Figure 1 A flow chart of the laser beam high-frequency wobble powder feeding based cladding repair process of one embodiment of the present application is shown. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, and therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0022] Reference will now be made to the following Figure 1 The laser beam high-frequency wobble powder feeding based cladding repair process according to some embodiments of the present application is described.

[0023] In one embodiment according to the present application, as Figure 1 shown, the laser beam high-frequency wobble powder feeding based cladding repair process is proposed, comprising: Step 102, preheating the base material area of the component to be repaired; Step 104, using the laser beam to melt and solidify the repair powder delivered to the base material area according to the set path for multiple times to form a multi-layer transition layer; Step 106, using the laser beam to melt and solidify the repair powder delivered to the transition layer according to the set path to form an additive layer.

[0024] The laser beam high-frequency wobble powder feeding based cladding repair process provided by the present application can increase the lateral disturbance of the molten pool, accelerate the escape of the molten pool gas, break the columnar crystal growth, convert the transition layer grains from columnar crystals to equiaxed crystals, significantly improve the impact toughness of the repair area, thereby reducing the generation of cracks and deformation of the repair area, realize the collaborative optimization of geometric precision and mechanical properties in the laser additive repair process, inhibit residual stress and deformation, meet the remanufacturing requirements of high precision and low defects, and improve the service reliability of the repaired component.

[0025] Since the repair powder includes iron-based alloy powder, a cryptocrystalline martensite matrix and a dispersed nano-carbide structure can be obtained in the additive layer, the hardness of the repair area is improved, and the crack rate of the repair area is reduced.

[0026] In addition, due to the preheating control of the substrate area, the difference in the thermal expansion coefficient between the substrate area and the cladding layer can be reduced, and the residual stress can be reduced to below 150 MPa (XRD measurement).

[0027] Optionally, the component to be repaired can be a critical component of heavy equipment, for example, a gas turbine blade.

[0028] Optionally, the preheating time can be 8 min ~12min, ensuring uniform heat penetration of the substrate area.

[0029] Optionally, an infrared heating plate is used for preheating treatment of the substrate area.

[0030] In some embodiments, optionally, the EBSD detector is used to scan the solidified transition layer, and in the case that columnar crystals are still present in the transition layer, the swing frequency of the laser beam is increased or the scanning speed of the laser beam is reduced.

[0031] In this embodiment, by combining the EBSD detector with the swing technology, the problem of embrittlement caused by organizational inheritance is systematically solved, the proportion of equiaxed crystals can reach more than 80%, the organizational mutation is eliminated, the impact toughness of the repaired area is further improved, and the service life of the repaired component is prolonged.

[0032] In this embodiment, by combining the EBSD detector with the swing technology, the problem of embrittlement caused by organizational inheritance is systematically solved, the proportion of equiaxed crystals can reach more than 80%, the organizational mutation is eliminated, the impact toughness of the repaired area is further improved, and the service life of the repaired component is prolonged.

[0033] In some embodiments, optionally, the multi-layer transition layer comprises a first layer, a second layer and a third layer in sequence, the first layer is close to the substrate area, and the power of the laser beam for forming the first layer, the second layer and the third layer decreases in sequence, and the scanning speed decreases in sequence.

[0034] In this embodiment, the transition layer is designed for gradient energy input, so that the grain size decreases from the substrate area to the additive layer, that is, the grain gradient evolution of the entire repaired area is controlled, and combined with the spiral swing of the laser beam, the columnar crystal growth is broken, the proportion of equiaxed crystals is increased, the impact toughness of the repaired area is improved, the residual stress and deformation are inhibited, the shape of the repaired area is accurately controlled, and the problems of cracks, deformation and pores in traditional laser repair are solved.

[0035] In some embodiments, optionally, the power of the laser beam for forming the first layer is 2.5kW, and the scanning speed is 12mm / s; the power of the laser beam for forming the second layer is 2.0kW, and the scanning speed is 10mm / s; the power of the laser beam for forming the third layer is 1.5kW, and the scanning speed is 8mm / s.

[0036] In some embodiments, optionally, the preheating temperature is 300℃~400℃.

[0037] In some embodiments, the preheated substrate region is optionally subjected to a holding treatment; wherein the holding time is 8 min to 12 min.

[0038] In some embodiments, the component of the iron-based alloy powder includes Fe, Cr, Ni, W and Ti, wherein the content of Cr is 18%, the content of Ni is 8%, the content of W is 5%, the content of Ti is 1.5%, and the rest is Fe.

[0039] In some embodiments, the power of the laser beam is 2.5 kW to 3.5 kW; the scanning speed is 12 mm / s to 18 mm / s, the powder feeding rate is 12 g / min to 18 g / min; and the cooling rate is greater than 10 4 ℃ / s.

[0040] In some embodiments, the frequency of the laser beam is determined according to the material of the component to be repaired.

[0041] In some embodiments, when the material of the component to be repaired is a low melting point material, the frequency of the laser beam is determined to be 500 Hz to 600 Hz; when the material of the component to be repaired is a steel matrix material, the frequency of the laser beam is determined to be 600 Hz to 800 Hz; and when the material of the component to be repaired is a high melting point material, the frequency of the laser beam is determined to be 800 Hz to 1000 Hz.

[0042] In a specific embodiment, the internal stress formation mechanism is combined with deformation control.

[0043] Orthogonal test design: Variable selection: laser power (1.5 kW-3 kW), scanning speed (5 mm / s-15 mm / s), powder feeding rate (10 g / min-20 g / min); Response index: residual stress (XRD measurement), deformation (three-coordinate detection), crack rate.

[0044] Optimization method: through range analysis and variance analysis, determine the primary and secondary influencing factors, and establish the process parameter-stress / deformation mapping model.

[0045] Application of laser high-frequency oscillation technology.

[0046] I. Oscillation parameter optimization (dynamic adjustment of frequency and amplitude): 1. Parameter range setting and adaptability analysis Frequency selection: Low frequency band (500 Hz-600 Hz): suitable for low melting point materials (such as aluminum alloy), to reduce the risk of concentrated heat input.

[0047] Mid-frequency band (600Hz~800Hz): Suitable for medium carbon steel (such as 40CrNiMo), balancing heat input and molten pool stability.

[0048] High frequency band (800Hz~1000Hz): suitable for high melting point materials (such as nickel-based alloys), maximizing the dispersion of thermal stress.

[0049] Amplitude dynamic adjustment formula: A = 0.4 × W + 0.1 (unit: mm) In the formula, W is the target width of a single cladding layer (mm). For example, if W = 3mm, then A = 1.3mm.

[0050] 2. Finite element simulation verification Model building: Use ANSYS (finite element analysis software) or COMSOL (multiphysics modeling software) to build a laser cladding thermo-mechanical coupling model, and input the swing parameters (frequency, amplitude) and material thermophysical parameters.

[0051] Simulation target: Verify the reduction in temperature gradient (target ≥30%). Predict the width of the heat-affected zone (HAZ) (target ≤ 0.5 mm).

[0052] Output results: Temperature field distribution map, stress field contour map.

[0053] 3. Experimental verification and correction Experimental design: 40CrNiMo steel substrate was selected, and the laser power (2.2kW) and scanning speed (10mm / s) were fixed. The frequency (500Hz, 800Hz, 1000Hz) and amplitude (0.5mm, 1.2mm, 2mm) were adjusted.

[0054] Testing indicators: Temperature gradient: monitored in real time by infrared thermal imager; HAZ width: measured with a metallographic microscope.

[0055] Corrected rule: If the HAZ width is greater than 0.5mm, the amplitude is reduced by 0.2mm and the frequency is increased by 100Hz.

[0056] II. Regulation of Tissue Genetic Effects (EBSD Analysis of Grain Orientation Relationships) 1. Sample preparation and testing Sample preparation: Cut the sample along the cross-section of the cladding layer and mechanically polish it to a mirror finish; Electropolishing (voltage 20V, time 30s, electrolyte is perchloric acid-ethanol solution).

[0057] EBSD detection: Equipment: Oxford Instruments Symmetry EBSD detector Parameters: Step size 0.5 μm, scan area covering the additive zone, transition zone, and base material zone.

[0058] 2. Grain orientation and brittle mechanism analysis Data analysis: Pole figure and orientation distribution function (ODF) were generated using Channel 5 software. Compare the grain orientation difference between the base material (rolling texture) and the additive zone (random orientation).

[0059] Brittleness mechanism: The orientation of the base material columnar grains extends along the cladding direction, causing stress concentration at the grain boundaries in the transition zone, which triggers intergranular cracks.

[0060] 3. Oscillation technique to break columnar grain growth Process adjustment: Oscillation path: Use a spiral trajectory to increase lateral disturbance of the molten pool. Oscillation frequency: 800 Hz, amplitude 1.2 mm.

[0061] Effect verification: EBSD shows that the transition zone grains change from columnar grains (aspect ratio > 5) to equiaxed grains (aspect ratio ≈ 1). Impact toughness (ASTM E23) increases by 40% (from 25 J to 35 J).

[0062] Three, non-uniform structure coordination control (zoning control strategy) 1. Additive zone structure optimization Process parameters: Laser power: 3.0 kW (high energy density); Scanning speed: 15 mm / s (high cooling rate > 10 4 ℃ / s); Oscillation frequency: 1000 Hz (grain refinement); Target structure: cryptocrystalline martensite matrix + nanoscale carbide (WC / TiC) dispersed distribution.

[0063] Verification method: TEM observation of carbide size (≤50 nm), hardness test ≥60HRC.

[0064] 2. Transition zone gradient energy input Energy gradient design: First layer: power 2.5 kW, scanning speed 12 mm / s; Second layer: power 2.0 kW, scanning speed 10 mm / s; Third layer: power 1.5kW, scanning speed 8mm / s.

[0065] Microstructure transition: grain size decreases from substrate zone (50μm) to additive zone (5μm) gradually.

[0066] Step 3: Substrate preheating control Preheating parameters: Temperature: 300℃~400℃ (infrared heating plate control); Time: 10min (uniform heat penetration).

[0067] Effect: Reduce the difference of thermal expansion coefficient between substrate and cladding layer, residual stress reduced to below 150MPa (XRD measurement) Four, comprehensive verification and optimization 1. Experimental verification Sample preparation: gas turbine blade (K438 alloy) tip repair; Process parameters: Swing frequency 800Hz, amplitude 1.2mm; Laser power 2.5kW, scanning speed 12mm / s; Substrate preheating temperature 350℃.

[0068] Test results: Transition zone microstructure: equiaxed crystal ratio >80% (EBSD statistics); Residual stress: 175MPa (XRD); Fatigue life: 1×10 6 Cycles (ASTM E466 Metal Fatigue Test Method under Axial Force Control), 45% higher than traditional process.

[0069] 2. Optimization iteration Feedback mechanism: If there are still columnar crystals in the transition zone, increase the swing frequency (+100Hz) or reduce the scanning speed (-2mm / s); Data recording: Establish a process parameter-microstructure performance database to support machine learning model optimization.

[0070] Propose a "frequency-amplitude-energy gradient" coordinated control method to realize integrated control of shape and performance, and systematically solve the embrittlement problem caused by microstructure inheritance through the combination of EBSD and swing technology.

[0071] Five, partition control strategy: 1. Additive zone microstructure control: high cooling rate nanometer strengthening (1) Technical target Obtain cryptocrystalline martensite matrix + nanometer carbide dispersion structure; Hardness ≥55HRC, crack rate ≤1%.

[0072] (2) Implementation steps a. Process parameter design Parameter Setting range Preferred value Laser power 2.5kW~3.5kW 3.0kW Scanning speed 12mm / s~18mm / s 15mm / s Powder feeding rate 12g / min~18g / min 15g / min Cooling rate >10 4 °C / s 1.2 x 10 4 °C / s b. In-situ nano-carbide generation control Powder formulation: Fe-based alloy (Cr 18%, Ni 8%, W 5%, Ti 1.5%); Reaction mechanism: W + C → Laser molten pool WC (size ≤ 50 nm) W + C 激光熔池 WC (size ≤ 50 nm) TEM (Transmission Electron Microscope) verification: bright-field image observation of carbide distribution, selected area diffraction (SAED) calibration of WC phase.

[0073] c. Cooling rate guarantee measures Auxiliary cooling: Argon gas cooling behind the molten pool (flow rate 10 L / min, angle 45°); Water cooling at the back of the substrate (temperature ≤ 80℃).

[0074] 2. Transition zone microstructure regulation: gradient energy input grain refinement (1) Technical objectives Grain size gradient transition from substrate zone (50 μm) to additive zone (5 μm); Eliminate microstructure mutation, impact toughness ≥ 35 J (ASTM E23 impact test method).

[0075] (2) Implementation steps a. Gradient energy input design Layer number Laser power (kW) Scanning speed (mm / s) Energy density (J / mm) 1st layer 2.5 12 208.3 2nd layer 2.0 10 200.0 3rd layer 1.5 8 187.5 b. Grain gradient evolution control EBSD monitoring: Scan the transition zone with a step size of 0.2 μm to generate a grain size distribution thermogram; Verify the grain size gradient: substrate (50 μm) → transition middle layer (20 μm) → additive zone (5 μm).

[0076] Swing auxiliary refinement: Frequency 800 Hz spiral swing, interrupting columnar crystal growth, equiaxed crystal proportion > 80%.

[0077] 3. Substrate zone regulation: preheating stress homogenization (1) Technical objectives Residual stress ≤ 200 MPa; Heat-affected zone (HAZ) width ≤ 0.3 mm.

[0078] (2) Implementation steps a. Precise preheating control Parameter Setting range Equipment Preheating temperature 300℃~400℃ Infrared heating plate (±5℃) Soaking time 8min~12min Thermocouple closed-loop control Temperature uniformity ≤±10℃ Thermal imager real-time monitoring b. Thermal stress inhibition mechanism Thermal expansion coefficient matching: Δα=α 基材 -α 熔覆层 where Δα≤2×10 -6 / ℃.

[0079] Residual stress detection: XRD sin 2 ψ method measurement, stress reduction after preheating >40%. Where XRD sin 2 ψ method is an analysis method in X-ray diffraction (XRD) residual stress measurement, mainly used to calculate the residual stress inside the material by measuring the lattice strain.

[0080] Propose "swing frequency-amplitude-power" coordinated control method, residual stress ≤200MPa, deformation ≤±0.1mm; Establish "additive-transition-base material" three-zone organization control model, repair part fatigue life improvement 40%.

[0081] Using synchronous powder feeding laser melting additive manufacturing technology, through orthogonal test research metal component base material additive manufacturing process internal stress formation mechanism and evolution law, form component deformation prevention and control method; Based on laser high frequency swing technology, explore the "thermal influence" and "organization inheritance" mechanism between additive manufacturing area and metal component base material organization, reveal the formation mechanism and evolution law of transition zone organization, establish additive / metal component substrate non-uniform organization (additive area, base material area, transition area) coordinated control method.

[0082] By optimizing the control of laser additive repair process parameters, the matrix organization of cryptocrystalline martensite and a small amount of carbide dispersed distribution is obtained, so as to obtain high hardness, low crack sensitivity of laser repair coating. High frequency swing laser repair new technology. Learn from laser beam swing welding technology, a kind of laser beam high frequency swing powder feeding laser cladding repair process is put forward, with the help of laser beam high speed swing to change the molten pool motion trail and then affect the temperature gradient and solidification rate, realize the coordinated control of organization and stress, improve the effect of laser cladding forming and inhibit pore, at the same time improve the microstructure performance (additive area, base material area, transition area), eliminate defects.

[0083] In the description of the present specification, all the quantities related to temperature including expression units are degrees Celsius, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance, unless otherwise explicitly specified and limited; the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0084] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0085] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cladding repair process based on high frequency wobbling of a laser beam powder feed, characterized in that, The method comprises the following steps: preheating a base material area of a component to be repaired; melting and solidifying repair powder delivered to the base material area along a set path multiple times using a laser beam to form a multi-layer transition layer; melting and solidifying repair powder delivered to the transition layer along the set path using the laser beam again to form an additive layer; wherein the set path is a spiral swing, the swing frequency of the laser beam is 500Hz-1000Hz, and the repair powder comprises iron-based alloy powder.

2. The laser beam high frequency wobble powder feeding based cladding repair process according to claim 1, characterized in that, The step of melting and solidifying repair powder delivered to the base material area along a set path multiple times using a laser beam to form a multi-layer transition layer specifically comprises: scanning the solidified transition layer using an EBSD detector, and increasing the swing frequency of the laser beam or reducing the scanning speed of the laser beam when columnar crystals are still present in the transition layer.

3. The laser beam high frequency wobble powder feeding based cladding repair process according to claim 1, characterized in that, The multi-layer transition layer comprises a first layer, a second layer and a third layer in sequence, the first layer is close to the base material area, and the step of melting and solidifying repair powder delivered to the base material area along a set path multiple times using a laser beam to form a multi-layer transition layer specifically further comprises: The power of the laser beam for forming the first layer, the second layer and the third layer respectively decreases in sequence, and the scanning speed of the laser beam decreases in sequence.

4. The laser beam high frequency wobble powder feeding based cladding repair process according to claim 3, characterized in that, The power of the laser beam for forming the first layer is 2.5kW, and the scanning speed is 12mm / s; The power of the laser beam for forming the second layer is 2.0kW, and the scanning speed is 10mm / s; The power of the laser beam for forming the third layer is 1.5kW, and the scanning speed is 8mm / s.

5. The laser beam high frequency wobble powder feeding based cladding repair process according to any one of claims 1 to 4, characterized in that, The temperature of the preheating treatment is 300-400℃.

6. The laser beam high frequency wobble powder feeding based cladding repair process according to any one of claims 1 to 4, characterized in that, After the preheating treatment of the base material area of the component to be repaired, the method further comprises: heat preservation treatment is performed on the base material area after the preheating treatment; wherein the heat preservation time is 8-12min.

7. The laser beam high frequency wobble powder feeding based cladding repair process according to any one of claims 1 to 4, characterized in that, The components of the iron-based alloy powder include Fe, Cr, Ni, W and Ti, wherein the content of Cr is 18%, the content of Ni is 8%, the content of W is 5%, the content of Ti is 1.5%, and the rest is Fe.

8. The laser beam high frequency wobble powder feeding based cladding repair process according to any one of claims 1 to 4, characterized in that, The step of melting and solidifying repair powder delivered to the transition layer along the set path using the laser beam again to form an additive layer specifically comprises: The power of the laser beam is 2.5kW~3.5kW; the scanning speed is 12mm / s~18mm / s, the powder feeding rate is 12g / min~18g / min; the cooling rate is greater than 10 4 ℃ / s.

9. The laser beam high frequency wobble powder feeding based cladding repair process according to any one of claims 1 to 4, characterized in that, The method further comprises: determining the frequency of the laser beam according to the material of the component to be repaired.

10. The laser beam high frequency wobble powder feeding based cladding repair process according to claim 9, characterized in that, The step of determining the frequency of the laser beam according to the material of the component to be repaired specifically comprises: in the case that the material of the component to be repaired is a low-melting-point material, determining the frequency of the laser beam to be 500-600Hz; in the case that the material of the component to be repaired is a steel matrix material, determining the frequency of the laser beam to be 600-800Hz; in the case that the material of the component to be repaired is a high-melting-point material, determining the frequency of the laser beam to be 800-1000Hz.

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