A method for repairing deep groove damage of a shaft component on site

Abstract

The application relates to the technical field of shaft component repairing, and particularly discloses a field repairing method for deep-groove damage of a shaft component; according to the size of the damage position of the shaft neck, the method adopts a multi-layered surfacing repairing mode to realize the repairing of the damage position. The application can effectively realize the metallurgical combination between the repairing layer and the base material, effectively reduce the welding difficulty and risk of one-time repairing of the deep-groove damage position, and reduce the bending influence of welding on the shaft component.

Description

Technical Field

[0001] This invention relates to the field of shaft component repair technology, and more specifically, to an on-site repair method for deep groove damage in shaft components. Background Technology

[0002] As equipment becomes larger, the main shafts in rotating machinery are also getting bigger, such as the main shafts of wind turbines, water turbines, large electric motors, and generators, with increasing diameters and weights. Wear and tear on these shafts are unavoidable during equipment operation.

[0003] Currently, most repairs on the market are for shallower grooves. For spindles with a depth of more than 30mm, conventional repair approaches and methods are often difficult to implement on-site. Therefore, users generally do not want to take on too much risk and will choose to return the spindle to the manufacturer for repair or replace it directly to avoid operational accidents that may be caused by improper repair.

[0004] Whether the device is returned to the manufacturer for repair or replaced directly, a long timeframe is often unavoidable, forcing users to shut down the device for repair, which results in significant losses for them.

[0005] The conventional method of repairing grooves by welding them in one go on-site cannot guarantee welding quality and poses a significant quality risk. This is mainly because excessive weld buildup in a single operation results in high residual stress, and stress concentration occurs at the groove. The combination of these factors can lead to internal cracking of the weld layer and bending of the shaft. The best approach is to perform preheating before welding and post-weld heat treatment. However, on-site heat treatment is often unavailable, making it impossible to implement, thus greatly increasing the risk of the shaft bending after welding. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an on-site repair method for deep groove damage of shaft components. The present invention can effectively achieve metallurgical bonding between the repair layer and the base material, while not only effectively reducing the welding difficulty and risk of repairing deep groove damage in one go, but also reducing the bending effect of welding on shaft components.

[0007] The solution adopted by this invention to solve the technical problem is:

[0008] A field repair method for deep groove damage in shaft components is proposed, which uses a multi-layered overlay welding repair method based on the size of the damaged area of ​​the journal to repair the damaged deep groove.

[0009] In some possible implementations,

[0010] Specifically, the following steps are included:

[0011] Step S1: Clean and perform non-destructive testing to confirm the size of the damaged area;

[0012] Step S2: Calculate the actual allowable operating load of the shaft component, the amount of cladding metal required to repair the damaged deep groove, and select the welding method and welding material;

[0013] Step S3: Calculate the number of welding repairs, the amount of welding material cladding metal required for each welding repair, and the thickness to be repaired;

[0014] Step S4: Perform multiple layers of weld overlay repair;

[0015] Among them, after the last welding repair, the height difference between the repaired part and the original surface is <0.03mm, the runout value of the weld layer is within 0.03mm, and the roughness is within 0.8; the repair is completed.

[0016] In some possible implementations,

[0017] Step S4 specifically refers to using the same repair method to perform multiple repairs according to the thickness of each weld overlay, with the outer surface of the repair layer formed after each repair being an arc-shaped concave surface.

[0018] In some possible implementations,

[0019] Step S1 specifically includes the following steps:

[0020] Step S11: Polish and process the damaged area to make the damaged area a circular arc groove after processing;

[0021] Step S12: Non-destructive testing;

[0022] Step S13: Measure the size of the damaged area.

[0023] In some possible implementations,

[0024] Step S2 specifically refers to:

[0025] Step S21: Calculate the actual allowable operating load of the shaft component using finite element software and strength formulas;

[0026] Step S22: Based on the strength verification, finite element software and welding test data, calculate the amount of cladding metal required to repair the damaged area, and select the welding method and welding materials according to the welding test.

[0027] In some possible implementations,

[0028] Step S3 specifically refers to:

[0029] Using finite element software and strength verification formulas combined with welding test data, calculations were performed again to determine the number of times layered welding repair was performed, the amount of welding material required for cladding metal, and the thickness of each repair layer.

[0030] In some possible implementations,

[0031] The repair method in step S4 specifically includes the following steps:

[0032] Step S41: Place the shaft component on the roller frame;

[0033] Step S42: Preheating; control the rotation of the shaft component, wherein the rotational linear velocity at the damaged part is 10-40 mm / min; the preheating temperature is 100℃-250℃, and the preheating time is 30-60 min;

[0034] Step S43: Welding; Welding is performed using one or more of the following methods: laser cladding, pulsed argon arc welding, and precision pulse welding.

[0035] Step S44: Perform post-heat treatment on the weld in the repair layer after welding. The post-heat temperature is 200℃-350℃ and the post-heat time is 1-3 hours.

[0036] Step S45: Process the rounded transition between the repair layer and the inner surface of the damaged area, and control the runout value to within 0.1mm;

[0037] Step S46: Perform non-destructive testing on the repaired area to confirm that there are no defects;

[0038] Step S47: Operate normally for 200-300 hours according to the calculated actual allowable operating load;

[0039] Step S48: Polish the repair layer and repeat steps S42-S47 for the next repair; until the repair is complete.

[0040] In some possible implementations,

[0041] When using laser cladding for repair, the power is 2000-3500W, the powder feed rate is 1.2-1.8r / min, and the spot size is 3-4mm.

[0042] In some possible implementations,

[0043] When pulsed argon arc welding is used for repair, cold melt cladding welding is performed using welding wire, with a welding current of 120-160A and a welding temperature of 0-60℃.

[0044] In some possible implementations,

[0045] The multiple-layer weld overlay repair refers to at least two layer weld overlay repairs.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] This invention repairs the damaged area by performing multiple layered welding. By controlling the thickness of each weld layer, the stress generated by the amount of molten metal in each layer is ensured to be much less than the yield strength at the effective diameter, thus ensuring that the residual stress and stress concentration of the welding are controllable. At the same time, the residual stress of the previous weld layer will be effectively reduced by each repair according to the actual allowable load (i.e., the aging process), thereby ensuring that the shaft will not bend.

[0048] Based on strength verification, finite element software, and welding test data, this invention maximizes the workload of a single welding operation while ensuring that welding does not cause deformation of shaft components. Furthermore, it ensures that the residual stress of the weld layer after the previous repair is eliminated before subsequent repairs through operation, thereby greatly reducing the number of welding repairs and improving repair efficiency. Attached Figure Description

[0049] Figure 1 This is a schematic diagram illustrating the repair process of the present invention; Detailed Implementation

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] The present invention will now be described in detail.

[0052] like Figure 1 As shown:

[0053] A field repair method for deep groove damage in shaft components is proposed, which uses a multi-layered overlay welding repair method based on the size of the damaged area of ​​the journal to repair the damaged deep groove.

[0054] In some possible implementations,

[0055] Specifically, the following steps are included:

[0056] Step S1: Clean and perform non-destructive testing to confirm the size of the damaged area; through machining or grinding, complete the correction of the damaged bevel and the removal of the fatigue layer, so that the bevel meets the welding requirements while keeping the size to a minimum, so as to reduce the amount of weld overlay.

[0057] Confirming the size of the damaged area means measuring the minimum diameter of the damaged area using techniques such as micrometers and blue light scanning.

[0058] Step S2: Calculate the actual allowable operating load of the shaft component, the amount of cladding metal required to repair the damaged deep groove, and select the welding method and welding material;

[0059] Step S3: Calculate the number of welding repairs, the amount of welding material cladding metal required for each welding repair, and the thickness to be repaired;

[0060] Step S4: Perform multiple layers of weld overlay repair;

[0061] Among them, after the last welding repair, the height difference between the repaired part and the original surface is <0.03mm, the runout value of the weld layer is within 0.03mm, and the roughness is within 0.8; the repair is completed.

[0062] In some possible implementations,

[0063] Step S4 specifically refers to using the same repair method to perform multiple repairs according to the thickness of each weld overlay, with the outer surface of the repair layer formed after each repair being an arc-shaped concave surface.

[0064] In some possible implementations,

[0065] Step S1 specifically includes the following steps:

[0066] Step S11: Polish and process the damaged area to make the damaged area a circular arc groove after processing;

[0067] Step S12: Non-destructive testing;

[0068] Step S13: Measure the size of the damaged area.

[0069] In some possible implementations,

[0070] Step S2 specifically refers to:

[0071] Step S21: Calculate the actual allowable operating load of the shaft component by using finite element analysis software or similar software, as well as relevant formulas such as the shaft torque formula and the torsional section modulus formula.

[0072] Step S22: Based on the strength verification, finite element software and welding test data, calculate the amount of cladding metal required to repair the damaged area, and select the welding method and welding materials according to the welding test.

[0073] The selection of welding materials is primarily determined by welding test parameters, but is not limited to process evaluation content such as tensile, bending, impact, hardness, and metallographic properties of the weld joint, and also includes relevant weld joint evaluation tests. The selection of welding materials refers to welding materials whose strength and coefficient of expansion are well-matched with the base material of the shaft component after process verification. These materials can be of the same or different materials, and can be heat-treated or cold-welded.

[0074] In some possible implementations,

[0075] Step S3 specifically refers to:

[0076] Using finite element analysis software and strength verification formulas combined with welding test data, further calculations and analyses were performed to determine the number of layered welding repairs, the amount of cladding metal required for each layer, and the thickness of each repair layer. Specifically, this refers to determining the minimum number of welding operations and the required safe welding thickness and cladding metal amount for each layer, based on welding test data, strength verification formulas, and finite element analysis; it also includes calculating the operational load and stress state to be achieved for each repair.

[0077] In some possible implementations,

[0078] The repair method in step S4 specifically includes the following steps:

[0079] Step S41: Place the shaft component on the roller frame;

[0080] Step S42: Preheating; control the rotation of the shaft component, wherein the rotational linear velocity at the damaged part is 10-40 mm / min; the preheating temperature is 100℃-250℃, and the preheating time is 30-60 min;

[0081] Step S43: Welding; Welding is performed using one or more of laser cladding, pulsed argon arc welding, and precision pulse welding; The shielding gas, powder feeding gas, and ionizing gas used in the above welding methods are all inert gases, preferably argon gas with a purity of 99.999%.

[0082] Step S44: Perform post-heat treatment on several small layers of weld in the repair layer after welding, with a post-heat temperature of 200℃-350℃ and a post-heat time of 1-3 hours;

[0083] Step S45: Process the fillet transition between the repair layer and the inner surface of the damaged area, and control the runout value to be within 0.1mm and the roughness to be within 1.6;

[0084] Preferably, the fillet radius is R, where R > 10mm. This setting can effectively reduce stress concentration and ensure the normal dynamic balance of the shaft component.

[0085] Step S46: Perform non-destructive testing on the repaired area to confirm that there are no defects;

[0086] Step S47: Operate normally for 200-300 hours according to the calculated actual allowable operating load;

[0087] Step S48: Polish the repair layer and repeat steps S42-S47 for the next repair; until the repair is complete.

[0088] It should be noted that, assuming the number of welding times is N, in the first N-1 times, each repair layer will be processed to form an arc groove on its upper surface; at the same time, the required weld thickness will be ensured, and in the Nth welding, the outer surface of the repair layer will be consistent with the outer surface of the shaft component.

[0089] In some possible implementations,

[0090] When using laser cladding for repair, the power is 2000-3500W, the powder feed rate is 1.2-1.8r / min, and the spot size is 3-4mm.

[0091] In some possible implementations,

[0092] When pulsed argon arc welding is used for repair, cold melt cladding welding is performed using welding wire, with a welding current of 120-160A and a welding temperature of 0-60℃.

[0093] In some possible implementations,

[0094] The multiple-layer weld overlay repair refers to at least two layer weld overlay repairs.

[0095] This invention employs multiple layers of welding to repair the damaged area. When the number of welding layers is n, the filler amount for each layer is 1 / n of the total filler amount. Therefore, the residual stress σ generated by each welding layer... n Much smaller than σ m The yield strength of the main shaft makes the deformation of shaft components controllable.

[0096] Under the premise that welding does not cause rotor deformation, the workload of a single welding repair is maximized. By running the machine under the actual allowable load for a period of time after each layer of welding repair is completed, the residual stress of the weld layer after the previous repair is eliminated in time before the next repair. This can greatly reduce the number of welding repairs and thus improve repair efficiency.

[0097] This invention enables on-site welding repair of shaft components through welding processes such as laser, pulsed precision welding, and micro-beam plasma welding. While achieving metallurgical bonding between the repair layer and the base material, it effectively reduces the welding difficulty and risk of repairing deep grooves in a single operation, and also minimizes the bending impact of welding on the rotor, making it the optimal on-site repair solution for users.

[0098] Example 1:

[0099] This embodiment specifically describes the repair of damage to the turbine main shaft. Laser cladding is used as the welding method. Based on strength calculations, finite element analysis, and welding tests, the repair of the turbine main shaft damage can be completed in two stages. The calculated cladding metal amount is approximately 30 kg. Based on the bevel shape, the first cladding is calculated to be 16 kg with a thickness of 18 mm. After 240 hours of operation, a second repair is performed, with another 16 kg of cladding metal completely filling the groove. The specific steps include:

[0100] I. First Repair:

[0101] 1) Polishing: Polishing the repaired damaged area to remove the fatigue layer and reveal the metallic luster;

[0102] 2) Processing: Adjust the bevel after step 1) by grinding or processing on site so that the damaged area is processed into an arc-shaped groove to meet the cladding welding conditions of the laser cladding equipment and ensure that the laser cladding head can reach the bottom of the damaged area for welding.

[0103] 3) PT test: Perform PT test on the damaged area after grinding to confirm that no defects or damage are displayed;

[0104] 4) Measurement: Measure the depth of the damage, calculate and analyze the thickness required for each weld and the operating load, confirm that the welding repair layer is two times, and confirm the thickness required for each weld.

[0105] 5) Place the turbine shaft on the roller frame and adjust the rotation speed to meet the requirements of laser cladding and ensure it is stable and normal;

[0106] 6) Preheating: Start the roller frame to rotate the turbine shaft, ensuring that the rotational linear velocity at the damaged area meets the requirement of 10-40 mm / min; at this time, preheat the turbine shaft according to the process requirements, with a preheating temperature of 100℃-250℃ and a preheating time of 30-60 min;

[0107] 7) Welding: When the preheating temperature meets the requirements, stop heating, start the laser cladding equipment, and start the laser cladding welding according to the cladding program set in advance according to the groove; the power of the laser cladding equipment is 2000-3500W, the powder feeding rate is 1.2-1.8r / min, the spot size is 3-4mm, and the welding material is stainless steel alloy powder.

[0108] 8) Post-weld heating: After the first layer is welded, the weld metal of the layer is immediately heated to a temperature of 200℃-350℃. During the heating process, the main shaft continues to rotate and the heating time is 1-3 hours. The main shaft continues to rotate until the temperature drops below 100℃, then stops rotating.

[0109] 9) Perform online machining or manual grinding on the turbine shaft to ensure that the weld bead in the first layer and the side of the damaged area are rounded; the radius of the rounded corner is R, R>10mm, and the runout value is within 0.1mm;

[0110] 10) Non-destructive testing: Perform PT and UT tests on the repaired area to confirm that there are no defects;

[0111] 11) Operation: Remove the turbine shaft and reinstall it into the equipment, and operate it normally according to the calculated load; after 240 hours of operation, carry out the second repair.

[0112] II. Second Repair

[0113] 1) Clamp the turbine shaft and then polish it; polishing specifically refers to cleaning and polishing the weld after the first repair to remove impurities such as oxide scale and rust, so as to meet the requirements of PT testing;

[0114] 2) PT testing: The cleaned and polished parts are subjected to PT testing, and no defects are detected;

[0115] 3) Preheating: Start the roller frame to rotate the turbine shaft and preheat the parts to be welded at a temperature of 250℃-400℃.

[0116] 4) Welding: In accordance with the rotation speed of the turbine shaft, start the laser cladding equipment to perform cladding welding until the weld is 0.5mm higher than the original surface of the turbine shaft; Laser cladding power: 2500-3500W, powder feed rate: 1.4-1.6r / min, spot size: 3-4mm;

[0117] 5) Post-weld heating: Immediately after welding the second layer, post-heat the weld metal at a temperature of 200℃-350℃. During the post-heating process, ensure that the main shaft continues to rotate and operate. The post-heating time is 1-3 hours. The main shaft continues to rotate until the temperature drops below 100℃, then stop rotating.

[0118] 6) Perform online machining or manual grinding on the turbine shaft to restore the journal dimensions, ensuring that the runout value after repair is within 0.03mm and the roughness is within 0.8.

[0119] 7) Non-destructive testing: Perform PT and UT tests on the shaft repair area to confirm that there are no defects and complete the shaft repair.

[0120] Example 2:

[0121] This embodiment is applied to a spindle with a damaged deep groove with a depth of 60mm, and cold welding is performed in three stages for repair.

[0122] Based on strength calculations and finite element analysis, combined with welding tests, this shaft component can be repaired through three robotic pulse welding operations. The calculated amount of cladding metal is approximately 45 kg. According to the bevel shape, the first weld is calculated to be 16 kg with a weld thickness of 18 mm. After 240 hours of operation, a second repair is performed, cladding metal of 15 kg with a weld thickness of approximately 20 mm. After 300 hours of operation, a third welding repair is performed, completely filling the groove. A certain nickel alloy welding wire is used as the welding material. The specific repair method is as follows:

[0123] I. First Repair

[0124] 1) Polishing: Polishing the repaired deep grooves to remove the fatigue layer and reveal the metallic luster;

[0125] 2) Processing: Through on-site grinding or processing, the deep grooves at the damaged area are processed into arc-shaped grooves to ensure that the cladding head can be inserted into the groove for welding;

[0126] 3) PT inspection: Perform PT inspection on the polished grooves to confirm that there are no defects or damage;

[0127] 4) Measurement: Measure the depth of the damaged deep trench, calculate and analyze the thickness required for each weld and the operating load, and confirm that the welding layers are three times;

[0128] 5) Clamping: Place the shaft component on the roller frame, adjust the rotation speed to meet the laser cladding line speed requirements and ensure stable operation;

[0129] 6) Welding: Use powders of dissimilar materials for cladding; start the laser cladding equipment and perform metallographic cladding according to the cladding program and cladding parameters set based on the deep grooves of the damage, controlling the layer temperature below 60℃;

[0130] 7) Machining: Perform online machining or manual grinding on this shaft component to ensure that the first layer of weld metal has a rounded transition with the base material, with a radius of R, R>10mm, and control the runout value within 0.3mm;

[0131] 8) Non-destructive testing: Perform PT and UT tests on the repaired area to confirm that there are no defects;

[0132] The first repair is now complete. The shaft component is removed and reinstalled into the equipment, which is then operated for 240 hours according to the calculated actual allowable load.

[0133] II. Second Repair

[0134] After the first repair and running for 240 hours, the second repair will begin.

[0135] 1) Clamping: Place the shaft component on the roller frame, adjust the rotation speed to meet the speed requirements of the automatic pulse argon arc welding line and ensure stable operation;

[0136] 2) Polishing: Cleaning and polishing the weld after the first repair;

[0137] 3) Non-destructive testing: Perform PT and UT tests on the cleaned and polished areas;

[0138] 4) Welding: Use an automatic pulse argon arc welding machine and welding wire for cold melt cladding welding. Welding parameters are 100-140A. Adjust the rotation speed of the shaft component to match the welding speed, test run and start welding; ensure the welding layer temperature is below 60℃.

[0139] 5) Machining: Perform online machining and manual grinding on this type of shaft component to restore the journal dimensions and ensure that the runout value after repair is within 0.1mm;

[0140] 6) Non-destructive testing: Perform PT and MT tests on the repaired area to confirm that there are no defects;

[0141] The second repair is now complete. The shaft is reinstalled in the equipment and will run for 300 hours according to the calculated actual allowable operating load.

[0142] III. Third Restoration

[0143] After the second repair and 300 hours of operation, the third repair was started, which has allowed the residual stress from the first two repairs to be released to a minimum through aging.

[0144] 1) Clamping: Place the shaft on the roller frame and adjust the rotation speed to meet the speed requirements of the automatic pulse argon arc welding line and ensure stable operation;

[0145] 2) Polishing: Cleaning and polishing the weld after the first repair;

[0146] 3) Non-destructive testing: Perform PT and UT tests on the cleaned and polished areas to confirm that no defects are detected;

[0147] 4) Welding: Use a pulse argon arc welding machine and welding wire for cold melt cladding welding. Welding parameters are 120-160A. Adjust the shaft speed to match the welding speed, test run and start welding. Ensure the welding layer temperature is below 60℃ until the weld is about 0.5mm higher than the original shaft surface.

[0148] 5) Rough machining: Perform rough machining on this shaft component, leaving a machining allowance of 0.3mm on one side;

[0149] 6) Non-destructive testing: Perform PT and MT inspections on the repaired shaft area to confirm that there are no defects;

[0150] 7) Use machining or fitter grinding to process the material, ensuring that the runout value after repair is within 0.03mm and the roughness is within 0.8.

[0151] 8) Non-destructive testing: Perform PT and MT inspections on the repaired shaft area to confirm that there are no defects;

[0152] This completes the on-site repair of the deep grooves damaged in the shaft component.

[0153] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A method for on-site repair of deep groove damage in shaft components, characterized in that, Depending on the size of the damaged area on the journal, a multi-layered welding repair method is used to repair the damaged area. Specifically, the following steps are included: Step S1: Clean and perform non-destructive testing to confirm the size of the damaged area; Step S2: Calculate the actual allowable operating load of the shaft component, the amount of cladding metal required to repair deep groove damage, and select the welding method and welding materials; Step S2 specifically refers to: Step S21: Calculate the actual allowable operating load of the shaft component using finite element software and strength formulas; Step S22: Calculate the amount of cladding metal required to repair the damaged area, and select the welding method and welding materials based on the welding test; Step S3: Calculate the number of welding repair cycles, the amount of welding material cladding metal required for each welding cycle, and the thickness to be repaired; specifically, step S3 refers to: The finite element method software and strength verification formula were used in conjunction with welding test data to perform calculations and analysis again, and to calculate the number of times the layered welding repair was performed, the amount of welding material cladding metal required for the welding, and the thickness of each repair layer. Step S4: Perform multiple layers of weld overlay repair; Among them, after the last weld repair, the height difference between the repaired area and the original surface is <0.03mm, and the runout value of the weld layer is within 0.03mm; the repair is complete. Step S4 specifically refers to using the same repair method to perform multiple repairs according to the thickness of each weld overlay, with the outer surface of the repair layer formed after each repair being an arc-shaped concave surface; the repair method in step S4 specifically includes the following steps: Step S41: Place the shaft component on the roller frame; Step S42: Preheating; control the rotation of the shaft component, wherein the rotational linear velocity at the damaged part is 10-40 mm / min; the preheating temperature is 100℃-250℃, and the preheating time is 30-60 min; Step S43: Welding; Welding is performed using laser cladding or pulsed TIG welding; When using laser cladding for repair, the power is 2000-3500W and the spot size is 3-4mm; When pulsed argon arc welding is used for repair, cold melt cladding welding is performed using welding wire, with a welding current of 120-160A and a welding temperature of 60℃. Step S44: Perform post-heat treatment on the weld in the repair layer after welding. The post-heat temperature is 200℃-350℃ and the post-heat time is 1-3 hours. Step S45: Round the corners of the repair layer and the inner surface of the damaged area for transition; Step S46: Perform non-destructive testing on the repaired area to confirm that there are no defects; Step S47: Operate normally for 200-300 hours according to the calculated actual allowable operating load; Step S48: Polish the repair layer and repeat steps S42-S47 for the next repair; until the repair is complete.

2. The on-site repair method for deep groove damage of shaft components according to claim 1, characterized in that, Step S1 specifically includes the following steps: Step S11: Polish and process the damaged area to make the damaged area a circular arc groove after processing; Step S12: Non-destructive testing; Step S13: Measure the size of the damaged area.

3. The on-site repair method for deep groove damage of shaft components according to claim 1, characterized in that, The multiple-layer weld overlay repair refers to at least two layer weld overlay repairs.

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