Ultrahigh-power laser low-loss repair method and system for deep defect of thick plate

Abstract

The invention belongs to the technical field of laser manufacturing and green manufacturing, and discloses an ultrahigh-power laser low-loss repair method for deep defects of a thick plate, which comprises the following steps: identifying the positions, types and three-dimensional shapes of the surface and deep defects (pores and cracks) of the thick plate through a phased array ultrasonic detection module (PAUT); on the basis, a laser space energy distribution repairing path for specific defects is automatically planned; carrying out an ultra-high power laser defect remelting process; finally, whether the surface and the deep part of the thick plate have defects or not is recognized again through the ultrasonic detection module, low-damage repair of the deep part defects of the thick plate is achieved, and the use efficiency and the service life of a repaired part are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser manufacturing and green manufacturing, and in particular relates to an ultra-high power laser low-loss repair method and system for deep defects in thick plates. Background Art

[0002] Thick-walled components are characterized by high strength, pressure resistance, and impact resistance, and are widely used in marine equipment and pressure vessels. However, during the manufacturing process, such as casting and welding, thick-walled components are prone to pores and cracks, which seriously damage their performance and cause the components to be scrapped.

[0003] Repair technology can achieve the remanufacturing of scrapped parts. At present, the commonly used repair technologies mainly use arc surfacing technology, thermal spraying technology and brush plating technology, and the above technologies are mainly used for the surface repair of welded products. However, for the repair technology of thick-walled components, the method of first removing the internal non-dense defects and then repairing them is mostly adopted. Patent CN202311404152.3 discloses an integrated welding method for repairing deep hole defects in aluminum alloy thick plates. The defects at the deep holes of the aluminum alloy are first polished, and then cold sprayed and filled to achieve the repair of the weldment. This method increases the repair cost on the one hand, and complicates the repair process on the other hand, which seriously affects the use efficiency of the repaired parts. At the same time, there are complex stresses on the surface after repair, which can easily cause the repaired parts to crack during subsequent use, seriously affecting the service life.

[0004] Through the above analysis, the problems and defects of the prior art are as follows:

[0005] (1) The existing technology increases the repair cost and complicates the repair process, which seriously affects the use efficiency of the repaired parts. At the same time, complex stress exists on the surface after repair, which can easily cause cracking of the repaired parts during subsequent use, seriously affecting their service life. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides an ultra-high power laser low-loss repair method for deep defects in thick plates.

[0007] The present invention is implemented as follows: an ultra-high power laser low-loss repair method for deep defects in thick plates comprises:

[0008] Step S1: clean the surface of the workpiece to be inspected, apply coupling agent on the surface to be inspected, use ultrasonic phased array ultrasonic PAUT to scan the workpiece in all positions, determine whether there are defects on the surface or deep inside of the material, determine their position, type and shape, and generate a three-dimensional distribution map of the defects;

[0009] Step S2: According to the defect location, type, shape and three-dimensional distribution map data of the defect identified in step S1, the ultrasonic detection results are converted into a three-dimensional network model, and the ultrasonic data is converted into a visual defect model through three-dimensional drawing software. According to the key physical parameters such as thermal conductivity and melting point of the material, simulation calculations of related processes are performed through simulation software, and the key process parameters of laser power and scanning speed are dynamically adjusted in combination with the defect depth gradient to realize laser spatial energy distribution repair path planning for specific defects;

[0010] Step S3: Under the above repair path planning, an ultra-high power laser remelting repair process is performed on the defect position;

[0011] Step S4: Use ultrasonic phased array ultrasonic testing to identify whether the surface and deep part of the thick plate contain defects again, and repeat the above steps.

[0012] Furthermore, the materials include non-ferrous metals and steel materials, and the identifiable internal defects include pores and cracks, etc., with a defect recognition rate of 98%.

[0013] Furthermore, the resolution of the three-dimensional defect distribution map in step S1 is ≤0.5 mm, and the detectable defect depth is ≥30 mm.

[0014] Furthermore, the ultrasonic coupling agent in step S1 may be water, glycerin or a special gel.

[0015] Furthermore, the thickness of the coupling agent in step S1 is 0.05 mm to 0.2 mm.

[0016] Furthermore, the ultra-high power laser in step S3 may be a continuous laser or a pulsed laser.

[0017] Another object of the present invention is to provide an ultra-high power laser low-loss repair system for deep defects in thick plates, comprising:

[0018] The scanning module is used to clean the surface of the workpiece to be inspected, apply coupling agent on the surface to be inspected, and use ultrasonic phased array ultrasonic PAUT to scan the workpiece in all positions to determine whether there are defects on the surface or deep inside the material, determine their location, type and shape, and generate a three-dimensional distribution map of the defects;

[0019] The conversion module is used to convert the ultrasonic detection results into a three-dimensional network model according to the identified defect location, type, shape and three-dimensional distribution map data of the defect, and convert the ultrasonic data into a visual defect model through three-dimensional drawing software. According to the key physical parameters of the material such as thermal conductivity and melting point, the simulation calculation of the relevant process is carried out through simulation software, and the key process parameters of laser power and scanning speed are dynamically adjusted in combination with the defect depth gradient to realize the laser spatial energy distribution repair path planning for specific defects;

[0020] A repair module is used to perform an ultra-high power laser remelting repair process on the defect position under the above repair path planning;

[0021] The detection module is used to identify whether the surface and deep part of the thick plate contain defects again through ultrasonic phased array ultrasonic detection, and repeat the above steps.

[0022] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0023] The present invention provides an ultra-high power laser low-loss repair method for deep defects in thick plates. The location, type and three-dimensional morphology of surface and deep defects (pores and cracks) of thick plates are identified through a phased array ultrasonic detection module (PAUT); on this basis, the laser spatial energy distribution repair path for specific defects is automatically planned; an ultra-high power laser defect remelting process is performed; and finally, the ultrasonic detection module is used to identify again whether the surface and deep part of the thick plate contain defects, thereby achieving low-damage repair of deep defects in the thick plate and improving the use efficiency and service life of the repaired parts.

[0024] 1. The present invention can directly perform laser repair on the internal defects of thick plates, avoiding the conventional internal defect repair method of first removing and then processing, and does not require multi-layer and multi-pass processing, thereby improving the repair efficiency, reducing the repair cost, and significantly improving the qualified rate of the repaired parts.

[0025] 2. The effective repair depth of the present invention is ≥30mm, and no secondary processing is required after repair.

[0026] 3. Compared with other repair methods, the surface stress after repair by the present invention can be reduced by less than 1 / 5, significantly reducing the surface damage of the repaired part.

[0027] 4. Compared with other nondestructive testing methods, the ultrasonic testing method adopted in the present invention has high detection sensitivity, high accuracy, fast detection speed, and can detect parts with complex geometric shapes.

[0028] 5. Compared with other defect repair methods, the present invention can accurately reconstruct the defect morphology in three dimensions and automatically plan the repair path for specific defects.

[0029] Through precise targeted repair rather than the traditional removal-then-processing technology for internal defects, material waste can be reduced, and it is estimated that the company can save 30% to 50% in maintenance costs; the repair efficiency is 3 to 5 times higher than traditional arc welding or ordinary laser repair, and the life of the workpiece after repair is extended by more than 30%, which promotes the improvement of production efficiency; at the same time, it reduces waste generation and energy consumption, which is in line with the trend of green manufacturing.

[0030] Traditional laser repair technology is limited by power and penetration depth, and can only handle shallow defects (<10mm); conventional heat sources (such as arc welding) have large heat input, which can easily cause workpiece deformation or performance degradation. The present invention uses ultra-high power laser (above 10kW) coupled with multi-modal energy control technology to achieve precise repair of defects deeper than 30mm for the first time, and the heat affected zone (HAZ) is controlled within 1mm. No secondary processing is required after repair. Compared with other repair methods, the surface stress after repair by the present invention can be reduced by less than 1 / 5, significantly reducing the degree of surface damage of the repaired parts, filling the technical gap in the field of low-damage repair of deep defects.

[0031] The present invention can directly perform laser repair on internal defects of thick plates, avoiding the conventional repair method of first removing and then processing for internal defects. It does not require multi-layer and multi-pass processing, improves the repair efficiency, reduces the repair cost, and significantly improves the qualified rate of repaired parts. At the same time, increasing the power is easy to cause material overheating, phase change or cracking. The present invention innovatively proposes dynamic focus scanning and gradient energy input technology. By real-time regulation of the laser focus position and power waveform, a stable molten pool is formed in the deep while suppressing heat accumulation, solving the contradiction between "depth" and "low damage". BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the ultra-high power laser low-loss repair method for deep defects in thick plates provided by an embodiment of the present invention.

[0033] Figure 2 It is a structural block diagram of an ultra-high power laser low-loss repair system for deep defects in thick plates provided in an embodiment of the present invention.

[0034] Figure 3 It is a schematic diagram of ultra-high power laser low-loss repair processing provided by an embodiment of the present invention.

[0035] Figure 4 It is a schematic diagram of the phased array ultrasonic detection principle provided by an embodiment of the present invention.

[0036] Figure 5 It is a flow chart of the processing method provided by an embodiment of the present invention.

[0037] Figure 6 This is a picture showing the effect of an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] like Figure 1As shown, an ultra-high power laser low-loss repair method for deep defects in thick plates provided by an embodiment of the present invention comprises the following steps:

[0040] Step S1: clean the surface of the workpiece to be inspected, apply coupling agent on the surface to be inspected, use ultrasonic phased array ultrasonic PAUT to scan the workpiece in all positions, determine whether there are defects on the surface or deep inside of the material, determine their position, type and shape, and generate a three-dimensional distribution map of the defects;

[0041] Step S2: According to the defect location, type, shape and three-dimensional distribution map data of the defect identified in step S1, the ultrasonic detection results are converted into a three-dimensional network model, and the ultrasonic data is converted into a visual defect model through three-dimensional drawing software. According to the key physical parameters such as thermal conductivity and melting point of the material, simulation calculations of related processes are performed through simulation software, and the key process parameters of laser power and scanning speed are dynamically adjusted in combination with the defect depth gradient to realize laser spatial energy distribution repair path planning for specific defects;

[0042] Step S3: Under the above repair path planning, an ultra-high power laser remelting repair process is performed on the defect position;

[0043] Step S4: Use ultrasonic phased array ultrasonic testing to identify whether the surface and deep part of the thick plate contain defects again, and repeat the above steps.

[0044] The ultra-high power laser low-loss repair method for deep defects in thick plates proposed in this invention aims to achieve high-precision identification and repair of deep defects in thick plates by integrating four steps: ultrasonic phased array detection, three-dimensional modeling and simulation calculation, laser remelting repair and repeatability detection. This method can significantly improve the accuracy of defect detection and the stability of the repair process, and has a wide range of industrial application value.

[0045] In step S1, the thick plate is scanned at all positions by using the Phased Array Ultrasonic Testing (PAUT) technology to achieve high-resolution imaging and precise positioning of surface and deep defects. PAUT uses a multi-channel phased array probe and an adaptive focusing algorithm to perform non-destructive detection of workpieces at different angles and depths by combining electronic scanning with electronic focusing. Especially for deep defects, the use of the time delay control of the phased array and the Total Focusing Method (TFM) technology can significantly improve the signal-to-noise ratio and spatial resolution, thereby accurately capturing the geometric shape, position and type of the defects. The detection results are output in the form of a three-dimensional distribution map, providing accurate data support for subsequent repair path planning.

[0046] In step S2, the defect distribution data obtained by PAUT is converted into a three-dimensional network model to achieve accurate mapping from two-dimensional plane detection information to a three-dimensional space model. The detection data is visualized and reconstructed using three-dimensional drawing software (such as SolidWorks or AutoCAD), and a thermodynamic model including the defect area and the surrounding matrix material is constructed by combining finite element analysis (FEA) and numerical simulation software (such as ANSYS or COMSOL). Based on key physical parameters such as thermal conductivity, melting point, specific heat capacity and thermal expansion coefficient of different materials, the temperature field and stress field distribution under ultra-high power laser irradiation are simulated and calculated. Through an adaptive control algorithm, the laser power (1kW-10kW), scanning speed (0.1m / s-1.5m / s) and focus position are dynamically optimized to achieve refined repair path planning for complex geometric defects.

[0047] In step S3, an ultra-high power laser remelting repair process is used to selectively reconstruct the defective area. The laser beam is scanned and melted on the set path through the synergy of a high-precision focusing lens group and a motion control platform. In order to ensure uniform energy distribution and refined control during the repair process, the present invention introduces an adaptive energy adjustment mechanism (Adaptive Energy Adjustment Mechanism) to adjust the laser output power and scanning speed in real time according to changes in defect depth and shape. Experiments show that this repair method can achieve complete repair of deep defects in workpieces with a thickness of less than 10 mm, and the uniformity of the microstructure of the remelting zone is significantly improved, and the grain refinement effect is good.

[0048] In step S4, the repair area is scanned and compared and analyzed for the second time by ultrasonic phased array detection technology to ensure the integrity and stability of the repair effect. Compared with traditional surface detection methods, PAUT can penetrate deep into the material and accurately detect potential residual defects and stress concentration areas in the remelting area. Combining differential algorithms and image processing technology, the defect distribution before and after repair is automatically compared and analyzed to achieve quantitative evaluation of the repair effect. Experimental results show that after the repair process of the present invention, the defect removal rate reaches 98.7%, and the tensile strength and fatigue resistance of the material are significantly improved.

[0049] In addition, this method has good adaptability and scalability. By performing closed-loop feedback control (Closed-Loop Feedback Control) on ultrasonic testing and laser remelting repair, it is possible to automatically adjust the repair path and process parameters based on real-time detection and dynamic optimization to meet the diverse repair needs of different materials and defect types. Compared with traditional repair processes, the present invention can not only accurately identify and efficiently repair deep defects in thick plates, but also significantly reduce secondary damage to materials and the generation of heat-affected zones, thereby improving the overall quality and service life of the workpiece.

[0050] In summary, the present invention constructs a full-process system for repairing deep defects in thick plates through multi-step collaborative optimization and refined control. This method can effectively overcome the problems of low detection accuracy, low repair efficiency and unstable quality control in traditional repair processes, and provides a new technical path and method for high-precision repair of deep defects in thick plates.

[0051] The materials provided by the embodiments of the present invention include non-ferrous metals and steel materials, and the identifiable internal defects include pores and cracks, etc., with a defect recognition rate of 98%.

[0052] The resolution of the three-dimensional defect distribution map in step S1 provided by the embodiment of the present invention is ≤0.5 mm, and the detectable defect depth is ≥30 mm.

[0053] The ultrasonic coupling agent in step S1 provided in the embodiment of the present invention may be water, glycerin or a special gel.

[0054] The thickness of the coupling agent in step S1 provided in the embodiment of the present invention is 0.05 mm to 0.2 mm.

[0055] The ultra-high power laser in step S3 provided in the embodiment of the present invention may be a continuous laser or a pulsed laser.

[0056] like Figure 2 As shown, an ultra-high power laser low-loss repair system for deep defects in thick plates provided by an embodiment of the present invention comprises:

[0057] The scanning module is used to clean the surface of the workpiece to be inspected, apply coupling agent on the surface to be inspected, and use ultrasonic phased array ultrasonic PAUT to scan the workpiece in all positions to determine whether there are defects on the surface or deep inside the material, determine their location, type and shape, and generate a three-dimensional distribution map of the defects;

[0058] The conversion module is used to convert the ultrasonic detection results into a three-dimensional network model according to the identified defect location, type, shape and three-dimensional distribution map data of the defect, and convert the ultrasonic data into a visual defect model through three-dimensional drawing software. According to the key physical parameters of the material such as thermal conductivity and melting point, the simulation calculation of the relevant process is carried out through simulation software, and the key process parameters of laser power and scanning speed are dynamically adjusted in combination with the defect depth gradient to realize the laser spatial energy distribution repair path planning for specific defects;

[0059] A repair module is used to perform an ultra-high power laser remelting repair process on the defect position under the above repair path planning;

[0060] The detection module is used to identify whether the surface and deep part of the thick plate contain defects again through ultrasonic phased array ultrasonic detection, and repeat the above steps.

[0061] The present invention provides an ultra-high power laser low-loss repair method for deep defects in thick plates, which can achieve low-damage repair of deep defects (pores, cracks) in thick plates and improve the use efficiency and service life of repaired parts.

[0062] Combination Figure 3 , Figure 4 and Figure 5 The embodiment of the present invention is described, and the specific process implemented by the present invention specifically includes the following steps:

[0063] Example 1: The repair object in this example is 316L stainless steel for marine equipment with a thickness of 30 mm. After welding, shrinkage defects are found inside with a shrinkage hole diameter of 4 mm. A laser repair process is now performed on it.

[0064] Step S1: Use a cleaning agent to clean the surface of the workpiece, clean the oil and rust remaining on the steel surface, wait for 20 minutes to observe whether it is naturally dried, apply a coupling agent on the surface to be inspected, the selected coupling agent can be mineral oil or special ultrasonic gel, and the thickness of the coupling agent is controlled to be 0.05mm~0.2mm. Use an ultrasonic phased array ultrasonic (PAUT) flaw detector to scan the workpiece in all positions. During the detection process, set the excitation aperture and focusing law, dynamically adjust the deflection direction, focusing depth and focus size of the transmitted sound beam, select a linear array probe, and obtain the formation position of the probe in the scanning direction through an encoder. The approximate position and type of the deep defect are obtained through the signal received by the probe. Then, without moving the probe, select a single-line linear scanning mode, obtain 40 scanning points, and the scanning width is 2mm. Therefore, the sample is scanned three times in a single line, and the delamination defect at the same buried depth is scanned each time, and the S-scan image and C-scan image of the ultrasonic defect are obtained to generate the three-dimensional morphology information of the shrinkage defect.

[0065] Step S2: According to the depth position and three-dimensional morphology distribution data of the shrinkage defect identified in step S1, they are input into the three-dimensional modeling software, a three-dimensional model of the shrinkage defect is generated according to the detection data, the shrinkage area is calibrated, a three-dimensional network model of the shrinkage defect is generated and imported into the simulation software, and the thermal physical parameters (thermal conductivity, melting point) and other related information of 316L stainless steel are found, and the relevant process simulation of laser remelting is performed. In combination with the depth gradient of the defect, the key process parameters such as laser power, scanning speed and scanning path in the laser remelting process are dynamically adjusted to realize the laser spatial energy distribution repair path planning for specific defects.

[0066] Step S3: Under the above repair path planning, according to the preset laser remelting repair process parameters, such as laser power, scanning speed and scanning path and other key process parameters, an ultra-high power laser remelting repair process is performed. At the same time, the entire repair process is carried out in 95% Ar gas and 5% CO 2 Completed in a protective gas atmosphere.

[0067] Step S4: Detection, judgment and processing: Use ultrasonic phased array ultrasonic testing to identify again whether there are defects on the surface and deep part of the thick plate. If there are no defects, the repair is completed. If there are defects, repeat the above steps S1-S4.

[0068] The ultra-high power laser low-loss repair system for deep defects in thick plates provided by the present invention realizes closed-loop control and adaptive optimization from defect identification to precise repair by integrating four modules: ultrasonic phased array testing, three-dimensional modeling and simulation analysis, laser remelting repair and repeatability testing. In the scanning module, the ultrasonic phased array (Phased Array Ultrasonic Testing, PAUT) technology is used to perform high-precision scanning of the workpiece in all positions. With the beam focusing and scanning imaging capabilities of the multi-channel array probe, high-resolution detection and positioning of surface and deep defects in thick plates can be performed. By using multi-angle incidence and phased focusing imaging algorithms, different types of defects such as cracks, holes, inclusions, etc. can be accurately identified, and a three-dimensional distribution map of the defects can be generated, thereby providing complete data support for subsequent repair path planning.

[0069] In the conversion module, the present invention converts the detection results into a visual defect model with spatial position and geometric features by constructing a three-dimensional network model based on ultrasonic detection data. The thermodynamic responses of different types of defects are simulated and calculated using CAD software and finite element analysis software (such as ANSYS or COMSOL). By establishing a heat conduction model based on key physical parameters such as thermal conductivity, melting point, specific heat capacity and thermal expansion coefficient, the distribution and evolution of the temperature field inside the material under laser irradiation are analyzed. Combined with the differences in defect depth and geometric morphology, an adaptive algorithm is used to dynamically optimize the laser power (adjustable from 1kW to 10kW) and the scanning speed (0.1m / s-1.5m / s) to ensure uniform energy deposition and sufficient melting repair in deep defect areas.

[0070] In the repair module, the ultra-high power laser remelting process selectively remelts and resolidifies the defective area along a predetermined repair path through the precise linkage of the focusing lens group and the motion control platform. The refined control and dynamic power adjustment of the high-energy laser beam enable the repair process to have high energy density, low damage and excellent recrystallization effect. By optimizing the laser beam focus size, scanning step length and superposition strategy, efficient repair and surface reconstruction of deep defects in thick plates are achieved. Experiments show that after adopting the laser remelting process of the present invention, the recrystallized grain size in the weld area is reduced by 30%-50% compared with the original parent material, which significantly improves the mechanical properties and fatigue resistance of the material.

[0071] In the detection module, the integrity and consistency of the repair effect are verified through secondary detection and repeatability evaluation of ultrasonic phased array technology. Combined with the comparative analysis of the results of the two tests before and after, the structural integrity of the repair area and the degree of removal of potential defects can be accurately judged. The repair effect is quantitatively evaluated through the residual defect identification and stress concentration area prediction method based on the difference algorithm. The experimental results show that the repair system of the present invention can improve the detection accuracy of deep defects in thick plates to within 0.2mm, and the defect removal rate reaches 98.7%. At the same time, the adaptive control mechanism of the system significantly improves the reliability and stability of the repair process, meeting the requirements for refined repair of complex workpiece structures.

[0072] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. An ultra-high power laser low-loss repair method for deep defects in thick plates, characterized in that: The following steps are involved: 1) Clean the surface of the workpiece to be inspected, apply coupling agent on the surface, and use ultrasonic phased array ultrasound (PAUT) to scan the workpiece in all positions to generate a three-dimensional distribution map of defects; 2) Convert the defect three-dimensional distribution map data obtained in step 1 into a three-dimensional network model, combine the thermal conductivity and melting point physical parameters of the material, use simulation calculation to dynamically adjust the laser power and scanning speed, and generate a repair path plan; 3) According to the repair path planning generated in step 2, the defective area is remelted and repaired using an ultra-high power laser; 4) Inspect the repaired workpiece using ultrasonic phased array ultrasonic testing and repeat the above steps.

2. The ultra-high power laser low-loss repair method for deep defects in thick plates according to claim 1, characterized in that: The workpiece materials include non-ferrous metals and steel materials, and the identifiable internal defects include pores and cracks, with a defect recognition rate of 98%.

3. The ultra-high power laser low-loss repair method for deep defects in thick plates according to claim 1, characterized in that: The resolution of the three-dimensional defect distribution map generated in step 1 is no more than 0.5 mm, and the detectable defect depth is no less than 30 mm.

4. The ultra-high power laser low-loss repair method for deep defects in thick plates according to claim 1, characterized in that: The ultrasonic coupling agent used in step 1 is water, glycerin or special gel.

5. The ultra-high power laser low-loss repair method for deep defects in thick plates according to claim 1, characterized in that: The thickness of the coupling agent in step 1 ranges from 0.05 mm to 0.2 mm.

6. The ultra-high power laser low-loss repair method for deep defects in thick plates according to claim 1, characterized in that: The ultra-high power laser used in step 3 is a continuous laser or a pulsed laser.

7. An ultra-high power laser low-loss repair system for deep defects in thick plates implementing the ultra-high power laser low-loss repair method for deep defects in thick plates as claimed in any one of claims 1 to 6, characterized in that: include: The scanning module is used to clean the surface of the workpiece to be inspected, apply coupling agent on the surface to be inspected, and use ultrasonic phased array ultrasonic PAUT to scan the workpiece in all positions to determine whether there are defects on the surface or deep inside the material, determine their location, type and shape, and generate a three-dimensional distribution map of the defects; The conversion module is used to convert the ultrasonic detection results into a three-dimensional network model according to the identified defect location, type, shape and three-dimensional distribution map data of the defect, and convert the ultrasonic data into a visual defect model through three-dimensional drawing software. According to the key physical properties of the material such as thermal conductivity and melting point, the simulation calculation of the relevant process is carried out through simulation software, and the key process parameters of laser power and scanning speed are dynamically adjusted in combination with the defect depth gradient to realize the laser spatial energy distribution repair path planning for specific defects; A repair module is used to perform an ultra-high power laser remelting repair process on the defect position under the above repair path planning; The detection module is used to identify whether the surface and deep part of the thick plate contain defects again through ultrasonic phased array ultrasonic detection, and repeat the above steps.

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