Hydro-generator ring surface defect laser cladding repair method

Abstract

The application discloses a laser cladding repair method for a water turbine generator ring surface defect, and the laser cladding repair material Q355 or the reinforcing material M2 is used to perform laser cladding repair on the defects on the surface of the ring, so that the problem that the existing ring repair technology gradually reduces the material on the surface of the ring and greatly reduces the service life of the ring is solved, the ring can be prevented from being removed by performing laser cladding on the material on the surface of the ring, the service life of the ring is prolonged, and the repair efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a collecting ring maintenance technical field, in particular to an overhead LNG pipeline support structure with settlement compensation adjustment. BACKGROUND

[0002] The collecting ring, also known as a slip ring, is an important equipment component of a generator set; the collecting ring is fixed on a rotating shaft and is in sliding contact with a carbon brush when the generator set rotates, so as to transmit excitation current to the excitation winding in rotation, and the carbon brush and the collecting ring are the transmission channel of the excitation voltage and the excitation current of the generator set and are also the key contact components of the rotating part and the stationary part of the generator set. The operation stability of the carbon brush and the collecting ring directly affects the establishment of the magnetic field of the generator and the generation of electric energy, and ensuring the reliable operation thereof is an important task for realizing the safe and stable operation of the generator set.

[0003] Since the collecting ring is operated in a high-speed rotating environment for a long time, the carbon brush is in sliding contact with the collecting ring, and a large current is transmitted, so that the surface roughness of the collecting ring is required to be high, and Ra is not greater than 1.6 mu m; in addition, a spiral groove is formed on the outer surface of the collecting ring to adapt to the heat dissipation requirement of a large current; in daily operation, the contact surface of the collecting ring is damaged due to factors such as electric corrosion and wear, and defects such as pits are generated, which threatens the safe and stable operation of the generator; the traditional processing method for the defects on the surface of the collecting ring of the collecting ring includes slight polishing and turning of the collecting ring; however, the method cannot fundamentally solve the problem and also causes the outer diameter of the collecting ring to gradually decrease, and the outer diameter of the collecting ring is reduced after multiple treatments, so that the collecting ring needs to be replaced; therefore, a laser cladding repair method for the defects on the surface of the collecting ring of a hydroelectric generator is needed to solve the above problems. SUMMARY

[0004] The technical problem to be solved by the application is to provide a laser cladding repair method for the defects on the surface of the collecting ring of a hydroelectric generator, which aims to solve the problem that the repair technology of the collecting ring in the prior art gradually reduces the material on the surface of the collecting ring, thereby greatly reducing the service life of the collecting ring, and the material on the surface of the collecting ring can be cladded by laser, so that the collecting ring is not removed, the service life of the collecting ring is prolonged, and the repair efficiency can be improved.

[0005] To solve the above technical problems, the technical solution adopted by the application is:

[0006] The laser cladding repair method for the defects on the surface of the collecting ring of a hydroelectric generator comprises the following steps:

[0007] S1, preparation before cladding, including powder preparation, gas source preparation and equipment preparation;

[0008] S2, surface pretreatment is performed on the collecting ring, including polishing and cleaning;

[0009] S3, the collecting ring is clamped and fixed:

[0010] The collector ring is fixed on the rotating platform by a tool, the clamping concentricity is adjusted by a dial indicator, and the concentricity is ensured to be not greater than 0.5 mm;

[0011] S4, according to the designed robot machining operation program, the coordinate points corresponding to the position to be repaired on the surface of the collector ring are taught. The operator must fully understand the path pattern designed in the program, otherwise the operation is prohibited;

[0012] S5, process parameter input, opening the required application program, inputting the pre-designed or determined process parameters into the program;

[0013] S6, trial run, verifying the correctness of the scanning path without opening the laser and without sending powder;

[0014] S7, carrying out cladding operation:

[0015] S701, local repair;

[0016] S702, local polishing and finishing;

[0017] S703, overall strengthening treatment;

[0018] S8, detecting the operation results.

[0019] Further, in step S1, the powder preparation includes placing the powder in a clean metal container and placing it in a drying box for drying; the powder drying time is set to 2 hours, and the temperature is set to 70°C; the gas source preparation includes checking and confirming whether the protective gas and the powder feeding gas source are sufficient, if the gas source is insufficient, the working gas required for the whole cladding operation needs to be prepared; checking whether all gas valves are normal, if not, they need to be replaced; when the gas valves are normal, open the gas control valve, check whether all flow meters can be normally adjusted and control the gas flow, whether the pipeline connection is abnormal, whether there is gas leakage at each pipeline and interface, and whether the powder feeding gas flow is within the normal powder feeding range; the equipment preparation includes powering on the whole set of cladding equipment according to the equipment start-up sequence and confirming that the equipment is normal and can normally emit light and powder. The whole set of equipment includes: laser, robot, control cabinet, large rotating platform, water cooler, powder feeder; after opening the powder feeder, start the powder measurement program, test the powder for more than three times, and the weight change of the three consecutive times of powder is not greater than 5%. During the powder measurement process, use strong light to irradiate the powder flow, and confirm that the powder focusing is in a normal state. After starting the robot and the laser, the robot is operated to select the light emission test program for light emission test, and it is confirmed that the laser can be normally controlled to emit light through the control system. Check the operation of the remaining equipment, and confirm that all equipment is running normally.

[0020] Further, the surface of the collector ring after service has oil stains and rust stains and other impurities, which should be fully removed to avoid affecting the subsequent cladding quality; the surface pretreatment includes: polishing, cleaning, etc.

[0021] Polishing: use an angle grinder to polish the ring surface to expose the metal luster;

[0022] Cleaning: use industrial alcohol to clean the polished ring surface to remove oil stains, etc.

[0023] For the collector ring and ablation, wear and tear, etc. The defects need to be treated, and the surface should be fully polished to avoid the presence of carbon film and burned material.

[0024] Further, when clamping and fixing, attention should be paid to not damaging the collector ring body and fixing the collector ring firmly, so that it does not slip due to rotation; after fixing, start the rotating platform to drive the collector ring to rotate, adjust the robot pose to the cladding position, and simulate the cladding process. Check if the collector ring is firmly fixed and whether it interferes with other equipment during rotation, and whether there are other safety hazards.

[0025] Preferably, in step S6, the trial run includes:

[0026] S601, in the teaching box, control panel or program, the enablement of laser, powder and protective gas is closed to ensure that no laser, powder and protective gas are emitted during the program running process;

[0027] S602, adjust the program to manual operation mode;

[0028] S603, adjust the robot manual operation speed to a predetermined range;

[0029] S604, run the program to confirm that the program scanning path has traveled along the designed or specified trajectory;

[0030] S605, power off the robot in manual mode.

[0031] Preferably, in step S701, the local repair includes:

[0032] Use repair material Q355 or reinforced material M2 to fill the local pit-shaped defects according to the shape characteristics of the pit-shaped defects, and the filling should cover the pit-shaped defect area.

[0033] Preferably, in step S702, the local polishing and finishing include:

[0034] Use an angle grinder to locally polish and smooth the filling area to make the laser cladding treatment area ring surface smooth without obvious steps.

[0035] Preferably, in step S703, the whole surface strengthening treatment includes:

[0036] The collector ring is subjected to laser cladding treatment on a local surface area or an entire ring area by using repair material Q355 or reinforcing material M2.

[0037] Preferably, in step S7, the laser cladding operation process comprises:

[0038] a. Open the laser, powder and protective gas control instructions in the program, set the rotation speed after the entire ring surface is subjected to cladding, start the rotation platform; set the program to automatic operation mode, power on the robot, adjust the automatic operation scanning speed to 100%, the operator wears laser protective glasses and runs the program;

[0039] b. Observe the cladding condition during the cladding process, timely change and optimize the process to prevent miscladding;

[0040] c. Pay attention to whether the protective gas and powder feeding gas flow are normal during the cladding process, and pay attention to whether the powder is normal;

[0041] d. The program is automatically ended after the cladding is completed, and the light and powder are automatically stopped; set the robot to manual mode.

[0042] Preferably, in the laser cladding process, the edge collapse prevention measures comprise:

[0043] When the collector ring corner edge is subjected to laser cladding treatment, the corner is heated, melted and re-solidified, and due to the fluidity of the material in the liquid state, the original right angle may become a round angle; in order to restore the right angle size, a layer is separately accumulated at the edge by using the above cladding steps a~d, the size is ensured to be sufficient, and the corner edge shape is processed by subsequent subtractive processing means;

[0044] The dust protection measures comprise:

[0045] The laser cladding material is a powder material, which is light in quality and is scattered during cladding, and may fall in the spiral groove and other areas. In order to prevent the influence of the metal powder on the precision of the thread groove and other conductive areas, the following means can be used for treatment:

[0046] A special fireproof cloth material with dustproof and fireproof functions is used for protection before laser cladding, and the spiral groove and other areas are shielded to prevent the powder from falling; a dust collector is used to clean the required area after laser cladding to remove the residual metal powder.

[0047] Preferably, in step S8, the detection of the operation result comprises appearance detection, process temperature monitoring, PT detection, appearance size detection and roundness detection.

[0048] The beneficial effects of the present application are as follows:

[0049] 1, The present application can effectively repair the surface defects of the collector ring by selecting laser cladding repair material Q355 or reinforcing material M2 and repairing the damaged parts of the collector ring surface by laser cladding technology, compared with the traditional repair method of polishing and turning, the method will not gradually reduce the surface of the collector ring, and greatly prolongs the service life of the collector ring;

[0050] 2, The laser cladding method provided by the present application is realized by a robot device and a rotating platform, and the cladding operation program set by the controller built in the robot is used for cladding operation, compared with the traditional polishing and turning method, the repair efficiency of the present application is higher, the repair period can be shortened, and the surface of the collector ring can obtain a reinforcing layer superior to the base material, thereby prolonging the service life. BRIEF DESCRIPTION OF DRAWINGS

[0051] The present application will be further described below in combination with the drawings and examples.

[0052] Figure 1 It is a flowchart diagram of the present application;

[0053] Figure 2 It is a system setting interface diagram in the embodiment of the present application;

[0054] Figure 3 It is a powder bucket heating function operation interface diagram in the embodiment of the present application;

[0055] Figure 4 It is a laser function operation interface diagram in the embodiment of the present application;

[0056] Figure 5 It is a manual mode operation interface diagram in the embodiment of the present application;

[0057] Figure 6 It is an automatic mode operation interface diagram in the embodiment of the present application;

[0058] Figure 7 It is a remote mode operation interface diagram in the embodiment of the present application;

[0059] Figure 8 It is an alarm processing mode operation interface diagram in the embodiment of the present application. DETAILED DESCRIPTION

[0060] Example 1:

[0061] The laser cladding repair method for the surface defects of the collector ring of the hydraulic generator comprises:

[0062] S1, preparation before cladding, including powder preparation, gas source preparation and equipment preparation;

[0063] S2, surface pretreatment of the collector ring, including polishing and cleaning;

[0064] S3, clamping and fixing the collector ring:

[0065] The collector ring is fixed on the rotating platform through the tool, the clamping concentricity is adjusted by using the dial indicator, and the concentricity is ensured to be not greater than 0.5 mm;

[0066] S4, according to the designed robot working operation program, the corresponding coordinate point of the collector ring surface to be repaired position is taught. The operator must fully understand the path style designed in the program, otherwise the operation is prohibited;

[0067] S5, process parameter input, opening the required application program, inputting the pre-designed or determined process parameters into the program;

[0068] S6, trial run, verifying the correctness of the scanning path without opening the laser and without sending powder;

[0069] S7, carrying out cladding operation:

[0070] S701, local repair;

[0071] S702, local polishing and finishing;

[0072] S703, whole surface strengthening treatment;

[0073] S8, detecting the operation result.

[0074] Further, in step S1, the powder preparation includes placing the powder in a clean metal container and placing it in a drying oven for drying; the powder drying time is set to 2 hours, and the temperature is set to 70°C; the gas source preparation includes checking and confirming whether the protective gas and the powder feeding gas source are sufficient, if the gas source is insufficient, the working gas required for the whole cladding operation needs to be prepared; checking whether each gas valve is normal, if not, it needs to be replaced; when the gas valve is normal, open the gas control valve, check whether each flow meter can be normally adjusted and control the gas flow, whether the pipeline connection is abnormal, whether there is gas leakage at each pipeline and interface, and the powder feeding gas flow needs to be within the normal powder feeding range; the equipment preparation includes powering on the whole set of cladding equipment according to the equipment start-up sequence and confirming that the equipment is normal and can normally emit light and powder. The whole set of equipment includes: laser, robot, control cabinet, large rotating platform, water cooler, powder feeder; after opening the powder feeder, start the powder measurement program, test the powder for more than three times, and the weight change of the three consecutive times of powder is not greater than 5%. During the powder measurement process, use strong light to irradiate the powder flow, and confirm that the powder focusing is in the normal state. After starting the robot and the laser, the robot is operated to select the light emission test program for light emission test, and it is confirmed that the laser can be normally controlled to emit light through the control system. Check the operation of the remaining equipment, and confirm that all equipment is running normally.

[0075] Further, the surface of the collector ring after service has oil stains and rust stains and other impurities, which should be fully removed to avoid affecting the subsequent cladding quality; the surface pretreatment includes: polishing, cleaning, etc.

[0076] Polishing: use an angle grinder to polish the ring surface to expose the metal luster;

[0077] Cleaning: use industrial alcohol to clean the polished ring surface to remove oil stains, etc.

[0078] For the collector ring and ablation, wear and tear, etc. The area needs to be treated, and the surface should be fully polished to avoid the presence of carbon film and burned material.

[0079] Further, when clamping and fixing, attention should be paid to not damaging the collector ring body and fixing the collector ring firmly, so that it does not slip due to rotation; after fixing, start the rotating platform to drive the collector ring to rotate, adjust the robot pose to the cladding position, and simulate the cladding process. Check if the collector ring is firmly fixed and whether it interferes with other equipment during rotation, and whether there are other safety hazards.

[0080] Preferably, in step S6, the trial run includes:

[0081] S601, in the teaching box, control panel or program, the enablement of laser, powder and protective gas is closed to ensure that no laser, powder and protective gas are emitted during the program running process;

[0082] S602, adjust the program to manual operation mode;

[0083] S603, adjust the robot manual operation speed to a predetermined range;

[0084] S604, run the program to confirm that the program scanning path has traveled along the designed or specified trajectory;

[0085] S605, power off the robot in manual mode.

[0086] Preferably, in step S701, the local repair includes:

[0087] Use repair material Q355 or reinforced material M2 to fill the local pit-shaped defects according to the shape characteristics of the pit-shaped defects, and the filling should cover the pit-shaped defect area.

[0088] Preferably, in step S702, the local polishing and finishing includes:

[0089] Use an angle grinder to locally polish and smooth the filling area to make the laser cladding treatment area ring surface smooth without obvious steps.

[0090] Preferably, in step S703, the whole surface strengthening treatment includes:

[0091] The collector ring is treated by laser cladding on the local surface area or the whole area with repair material Q355 or reinforcing material M2.

[0092] Further, the repair process parameter table is as follows:

[0093]

[0094] Table 1: Repair process parameter table

[0095]

[0096] Table 2: Additive reinforcement process parameter table.

[0097] Preferably, in step S7, the laser cladding operation process includes:

[0098] a. Open the laser, powder and protective gas control instructions in the program, set the rotation speed after cladding the whole ring surface, start the rotation platform; set the program to automatic operation mode, power on the robot, adjust the automatic operation scanning speed to 100%, the operator wears laser protective glasses and runs the program;

[0099] b. Observe the cladding condition during the cladding process, and timely change and optimize the process to prevent miscladding;

[0100] c. Pay attention to whether the protective gas and powder gas flow are normal during the cladding process, and pay attention to whether the powder is normal;

[0101] d. After the cladding is completed, the program is automatically ended, and the light and powder are automatically stopped; set the robot to manual mode.

[0102] Preferably, in the laser cladding process, the edge collapse prevention measures include:

[0103] When the laser cladding process is performed on the corner edge of the collector ring, the corner may become a round corner due to the fluidity of the material in the liquid state during heating, melting and re-solidification. To restore the size of the straight corner, a separate layer is accumulated at the edge using the above cladding steps a~d, ensuring sufficient size, and then processed into the shape of the corner edge by subsequent subtractive processing means;

[0104] The dust protection measures include:

[0105] The laser cladding material is a powder material with light weight, and the cladding may be scattered and fall in the spiral groove and other areas. To prevent the influence of metal powder on the precision of the thread groove and other conductive areas, the following means can be used for treatment:

[0106] Before laser cladding, special fireproof cloth material with dustproof and fireproof function is used for protection, and spiral groove and other areas are shielded to prevent powder from falling; after laser cladding, a dust collector is used to clean the required area to remove residual metal powder.

[0107] Preferably, in step S8, the detection of the work result comprises appearance detection, process temperature monitoring, PT detection, appearance size detection and roundness detection.

[0108] Further, the appearance detection comprises:

[0109] After the cladding is completed, the appearance forming condition of the collector ring repair part is checked, which specifically includes the following aspects:

[0110] (1) Whether the surface color is normal.

[0111] (2) Whether the surface powder sticking condition is serious, whether it can be removed by using a steel brush, and whether the powder is excessive and the power is too small. If there is almost no powder sticking condition on the surface, it means that the power is too large.

[0112] (3) Whether there are defects and deficiencies at the beginning and end of each pass. If there are defects, the laser dwell time at the beginning and end of each pass must be increased, and whether the fluctuation between passes is normal.

[0113] (4) Whether there are cracks, pits, delamination and other defects.

[0114] Further, the process temperature monitoring comprises:

[0115] An infrared temperature measuring device is used to monitor the temperature of the part surface and the vicinity of the cladding layer during the laser repair process of the collector ring.

[0116] Further, the PT detection comprises:

[0117] The collector ring surface area after laser cladding and additive strengthening is subjected to PT detection treatment, and the surface defects are detected.

[0118] Further, the appearance size detection comprises:

[0119] The diameter and thickness of the collector ring are detected by using a vernier caliper and other measuring tools.

[0120] Further, the roundness detection comprises:

[0121] The collector ring is placed on a rotary table, the collector ring is rotated by the rotary table, and the runout value of the outer circle surface of the collector ring is measured by using a dial indicator.

[0122] Example two:

[0123] The laser cladding repair method for the above-mentioned collector ring surface defects is realized based on a corresponding collector ring laser cladding repair device; the device comprises a laser, a robot, a control cabinet, a large rotating platform, a water cooling machine and a powder feeder.

[0124] Laser:

[0125] The laser device can be turned on only after the water cooling machine device is turned on, otherwise an alarm state will occur. The laser needs to be matched with the water cooling machine, and a high-power laser device cannot use a small-power water cooling machine, for example, a 6000W laser device should be matched with a 6000w water cooling machine device.

[0126] Robot:

[0127] The robot is a device responsible for trajectory motion, the robot is a FANUC six-axis robot, the weight is 250KG, the environmental temperature is suitable for 0~45℃, and the programming language is KAREL language; the robot control cabinet controls the robot to run various instructions, receives and transmits signals, and receives external input instructions in the control cabinet and transmits them to the robot for work; the teach pendant in the robot control cabinet is a device for issuing instructions to the robot, and the robot is completed by transmitting instruction information through the control cabinet; the teach pendant is mainly used for the motion trajectory teaching point of the robot, program running transmission, program writing and various control devices.

[0128] Control cabinet:

[0129] The control cabinet is composed of a PLC system, an atmosphere control system, a robot controller, a laser control, a PC, an information switch, a water cooling control, a gas control system and the like; the PLC model is Siemens S7-1200, installed in the middle of the integrated cabinet, and the external circuits of the integrated cabinet are connected by heavy load connectors for easy on-site quick plugging. An emergency stop button and a state indicator lamp are installed on the front of the control cabinet in a prominent position to facilitate device emergency stop operation and device running state display.

[0130] Powder feeder:

[0131] The powder feeder is a device that delivers cladding medium during cladding operation, and is located behind the mobile laser cladding device and consists of a powder barrel and a powder disc. The powder barrel is mainly used to store the powder needed for cladding; the powder disc is mainly used for powder delivery, which requires powder feeding gas for delivery. The power switch of the powder feeder is located behind the trolley, and the key is twisted to the open position. The power indicator light is on, and the control screen displays the boot state, indicating that the powder feeder power has been turned on. The red button is an emergency stop button for emergency stop; after the powder feeder operation panel is turned on, non-professional personnel should not change and operate the system, otherwise it will affect the normal operation of the powder feeder.

[0132] Large rotating platform:

[0133] Large rotating platform is a special equipment to carry the collector ring; rotating table adopts DC motor drive, workbench uniform speed adjustable. This large rotating around the vertical axis rotating table, below its workbench, are provided with supporting roller, workbench can also be assembled on the work.

[0134] Rotary table rotation speed regulation is variable frequency stepless regulation, rotary table has the following characteristics:

[0135] 1, simple structure, convenient operation.

[0136] 2, fixed base is welded from high-quality profile, after professional machining treatment, can ensure the machining accuracy and use precision of key position.

[0137] 3, the main shaft box is selected from high-quality steel after welding annealing and professional machining treatment, to ensure the durability and stability of long-term use.

[0138] Water cooling machine:

[0139] The equipment operation first opens the water cooling machine to cool down, so that the laser can run normally, no alarm information, water cooling machine for two kinds of working way, one is low temperature water cooling way, mainly for the laser cooling; One is high temperature water cooling way, mainly for the laser cladding head installed on the robot tool flange cooling.

[0140] Example three:

[0141] The program of the cladding operation system integrated in the PLC system is used to execute the above-mentioned laser cladding repair method for the ring surface defects of the collector ring of the hydro-generator; comprising:

[0142] As shown in Figure 1 The powder bucket heating function is used to heat the powder in the powder bucket, and the main function is to work in an environment with high humidity. The humidity will penetrate into the powder tank, and the powder will be wet. The powder bucket heating function can keep the powder dry and not affect the conveying.

[0143] As shown in Figure 2 The laser function is used for the laser that has been integrated with communication. It can realize the function of manual light opening and test the power of the laser.

[0144] As shown in Figure 3As shown, the manual mode is mainly applied to the use in the process debugging and the powder feeder test, the manual setting has the stirring function, is applied to the conveying of some fine powder, the powder particles are too fine, and the flowability is not enough, so that the powder conveying is not out, the stirring function can realize the uniform powder feeding, and the phenomenon that the powder is too fine and is blocked to cause the conveying not to be out.

[0145] As shown in the figure, Figure 4 The automatic mode is used for testing the flow quality of the powder, and the weight of the powder conveyed per minute can be detected.

[0146] As shown in the figure, Figure 5 The remote mode is applied to the automatic control switch powder in the laser cladding operation, and is complementary to the integrated I / O control instruction in the robot control cabinet, in the automatic state of the robot, the remote mode must be pressed, otherwise the powder will not be out. The powder feeder in the remote state is connected by DI / DO interface, MODBUS interface and PROF INET interface, and the device is used for remote communication by PROF INET interface.

[0147] As shown in the figure, Figure 6 The alarm processing mode is used for detecting the error of the powder feeder and the laser and alarming, if it is a false alarm, it only needs to click reset. If there is an alarm, please follow the relevant instruction manual to eliminate the processing or request the relevant professional to solve.

[0148] The shielding gas and the powder feeding gas are mainly used for process debugging and need to be adjusted in different degrees. The shielding gas is mainly used for protecting the inside of the laser head and the process surface oxidation, and the powder feeding gas is mainly used for adjusting the powder feeding speed. If the powder feeding speed is too fast and the powder feeding gas is too small, it will cause uneven powder feeding and dirty powder feeding.

[0149] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as the limitation of the present application. The protection scope of the present application should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features recorded in the claims. That is, the equivalent replacement improvement in this range is also within the protection scope of the present application.

Claims

1. A method for repairing the surface defects of a hydroelectric generator's collector ring by laser cladding, characterized in that, Comprise: S1, preparation before cladding, including powder preparation, gas source preparation and equipment preparation; S2, surface pretreatment of the collector ring, including grinding and cleaning; S3, clamping and fixing of the collector ring: The collector ring is fixed on the rotating platform through the tool, the clamping concentricity is adjusted by using the dial indicator, and the concentricity is ensured to be not greater than 0.5mm; S4, according to the designed robot working operation program, the corresponding coordinate point of the collector ring surface to be repaired position is taught; S5, process parameter input, open the required application program, and input the pre-designed or determined process parameters into the program; S6, trial operation, verify the correctness of the scanning path without opening the laser and without feeding the powder; S7, cladding operation: S701, local repair, including: Using repair material Q355 or reinforcing material M2, according to the shape characteristics of the pit-shaped defects, laser cladding is performed to fill the local pit-shaped defects, and the pit-shaped defect area needs to be covered; S702, local polishing and finishing, including: Using an angle grinder to locally polish and finish the filled area to make the laser cladding treatment area ring surface smooth without obvious steps; S703, whole surface reinforcing treatment, including: using repair material Q355 or reinforcing material M2 to perform laser cladding treatment on the local surface area or whole circle area of the collector ring; S8, detection of the operation results.

2. The method for laser cladding repair of the hydro-generator collector ring surface defects according to claim 1, characterized in that, In step S6, the trial operation includes: S601, in the teaching box, control panel or program, the enablement of laser, powder and protective gas is closed to ensure that no laser, powder and protective gas are output during the program running process; S602, the program is adjusted to manual operation mode; S603, the manual operation speed of the robot is adjusted to a predetermined range; S604, the trial operation program is run to confirm that the program scanning path has traveled along the designed or specified trajectory; S605, the robot is powered on in manual mode.

3. The method for laser cladding repair of the hydro-generator collector ring surface defects according to claim 1, characterized in that, In step S7, the laser cladding operation process includes: a. In the program, open the laser, powder and protective gas control instructions, set the rotation speed, start the rotating platform, set the program to automatic operation mode, power on the robot, adjust the automatic operation scanning speed to 100%, and the operator wears laser protective glasses and runs the program; b. Observe the cladding condition during the cladding process, and timely change and optimize the process to prevent miscladding; c. Pay attention to whether the protective gas and powder feeding gas flow is normal during the cladding process, and pay attention to whether the powder output is normal; d. After the cladding is completed, the program automatically ends, and the laser and powder are automatically stopped; the robot is set to manual mode.

4. The method for laser cladding repair of the hydroelectric generator ring surface defects according to claim 3, characterized in that, In the laser cladding process, the measures to prevent edge collapse include: A separate layer is added at the edge using the above cladding steps a~d to ensure sufficient size, and then a subsequent subtractive processing means is used to process the edge into an angular edge shape; The dust protection measures include: Before laser cladding, a special fireproof cloth material with dustproof and fireproof functions is used for protection, and other areas including spiral grooves are shielded to prevent powder from falling; after laser cladding, a dust collector is used to clean the required area to remove residual metal powder.

5. The method for laser cladding repair of the hydroelectric generator collector ring surface defects according to claim 1, characterized in that, In step S8, the detection of the operation results includes appearance detection, process temperature monitoring, PT detection, appearance size detection and roundness detection.

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