Repair device and method for heat compensation of solidification melting zone for adjusting heat source mode

Abstract

The invention discloses a solidification melting zone thermal compensation repairing device and method for adjusting a heat source mode, and belongs to the technical field of metal part repairing. In the traditional Gaussian laser single crystal repairing process, columnar crystal orientation isometric crystal transformation can be induced due to the violent heat dissipation effect on the top of a molten pool and the component supercooling effect of the solidification front edge, new crystal grains preferentially nucleate and grow on the top of the molten pool, and the mixed crystal defect on the top of a repairing layer is caused. The scheme that annular laser is adopted as main laser, a thermal compensation auxiliary laser beam and a zoom laser beam expander are added for cooperative regulation and control is provided, the temperature gradient and the cooling speed of a molten pool are controlled by accurately adjusting a heat source energy distribution mode, the tendency of columnar crystal orientation isometric crystal transformation is restrained, and the quality of the molten pool is improved. And mixed crystal defects at the top of the repair layer are eliminated. Compared with an existing method, the method is large in process window and good in parameter adaptability; the material application range is wide, and the repairing requirements of different alloy systems can be met; equipment adjustment is simple, and industrial application is easy to achieve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal part repair, and particularly relates to a repair device and method for adjusting solidification melting zone thermal compensation of a heat source mode. BACKGROUND

[0002] The nozzle, blade, combustion chamber and other high-temperature alloy hot-end components of an aero-engine and a gas turbine are prone to wear, deformation, cracks and other damages due to long-term service in an extremely harsh environment of high temperature, high pressure, strong corrosion and complex alternating stress, and thus lead to failure of the components. In addition, the material processing of these hot-end components is difficult, the shape structure is complex, the precision requirement is high, and the like, which leads to a long processing cycle and high processing cost. Direct replacement of damaged parts will inevitably greatly increase the maintenance cost of the aero-engine and cause huge economic losses. Most of the processing and service damages belong to the repairable category. Therefore, it is of great economic value and strategic significance to develop metal part repair technology based on additive manufacturing, to realize high-quality, low-cost, engineering application and even in-situ repair of complex structure hot-end components.

[0003] Taking the repair of high-temperature alloy single crystal turbine blades, the core hot end components of aero-engine and gas turbine, as an example, the traditional welding repair method is difficult to meet the repair needs of thin-walled blade complex structure due to the large heat-affected zone. With the development of metal additive manufacturing technology, laser additive repair method has attracted widespread attention in the field of blade repair. Patent CN107685220A discloses a repair method for cracks in complex thin-walled high-temperature alloy hot end components, which fills the powder mixed with plasticizing agent into the area to be repaired and performs pre-sintering, and then densifies and repairs by laser cladding. However, the pre-sintering parameters for different materials need to be optimized and adjusted through multiple experiments to ensure the density after pre-sintering, and the repair process is complex and tedious with low repair efficiency. Patent CN110819981A discloses a repair method for nickel-based single crystal turbine blade crown, which sets a certain temperature gradient according to the distance to the plane to be repaired to reduce thermal stress and thermal deformation in the laser cladding process. Patent CN116851783A discloses a repair device and method for cracks in nickel-based single crystal turbine blade body. First, the crack area is slightly beveled, then the blade to be repaired is clamped on a low-temperature circulating cooling device, and then the laser focus is aligned with the lowest point of the crack to start layer-by-layer repair. However, the laser cladding method produces a larger molten pool, and the repair precision is lower. The scanning laser epitaxy technology developed by SUMAN DAS team of George Institute of Technology in the United States can achieve a certain height of single crystal epitaxial growth on CMSX-4, René80, René N5 and other single crystal substrates. However, the scanning laser epitaxy method has limited repair height and poor surface flatness, which is not suitable for repairing small defects. Laser powder bed fusion technology has the characteristics of large temperature gradient, fast solidification speed and high forming precision, and has great potential in the precision repair of complex thin-walled structure blades. Patent CN115700156A discloses a laser repair method for single crystal turbine blade tip damage, which uses laser powder bed fusion method to repair the damaged blade, and performs hot isostatic pressing on the repaired blade to improve the microstructure and inhibit defect formation. However, this method has low repair efficiency, and the powder composition used is different from that of the repaired area, making it difficult to ensure the matching of the performance of the repaired area and the substrate.

[0004] Although some scholars have initially prepared small-sized single crystal organizations by using laser powder bed fusion technology, the heterogeneous crystal defects are the bottleneck of laser powder bed fusion repair of single crystal blades. Among them, the heterogeneous crystal defects at the top of the repair layer are due to the decrease of the temperature gradient in the metal liquid as the solidification front advances from the bottom of the molten pool to the free surface. Due to the composition undercooling formed by the solidification front and the severe heat dissipation on the surface of the molten pool, new grains are easily nucleated and grown at the top of the molten pool at the end of solidification. The temperature gradient and solidification velocity in the molten pool are the key factors for the generation of defects in the additive repair process. How to regulate these influencing factors to achieve precise control of defects is a problem to be solved in laser powder bed fusion repair of single crystal blades. Although process parameter optimization is the main means to adjust the temperature gradient and solidification velocity of the molten pool to control single crystal growth and improve solidification defects, the causes of various defects are different, and there are many influencing factors, so it is often impossible to optimize multiple defects at the same time.

[0005] Therefore, the skilled person in the art is committed to developing a solidification melt zone thermal compensation repair method combined with variable magnification beam expander to adjust the heat source mode. Under the premise of ensuring that no other defects are introduced, the heterogeneous crystal defects at the top of the repair layer are effectively eliminated, the epitaxial growth of single crystal organizations is realized, and the repair quality and efficiency of complex components are improved. SUMMARY

[0006] In view of the above defects of the prior art, the technical problem to be solved by the present application is the inhibition of heterogeneous crystal defects at the top of the repair layer in the process of laser powder bed fusion repair of single crystals, so as to realize the epitaxial growth of single crystals.

[0007] To achieve the above-mentioned purpose, the present application provides a solidification melt zone thermal compensation repair device for adjusting the heat source mode, comprising a forming environment system, an optical system and a laser powder bed fusion cavity system, wherein the forming environment system comprises a vacuum device and a protective gas device, the optical system comprises a main laser, a first diffractive optical element, a scanning galvanometer and an f-θ field lens of the main laser, an auxiliary laser, a second diffractive optical element, a variable magnification beam expander and a scanning galvanometer and an f-θ field lens of the auxiliary laser, and the laser powder bed fusion cavity system comprises a forming bin, a powder supply bin, powder, a powder spreading scraper, a part to be repaired and a recycling bin; the laser powder bed fusion cavity system is located in the forming environment system as a whole, and the main laser beam of the main laser and the auxiliary laser beam of the auxiliary laser reach any position in the forming area under the control of the corresponding scanning galvanometer and f-θ field lens.

[0008] Further, all devices in the optical system are connected with the computer, the operation and parameter setting of each device are controlled through the computer, the moving speed and path of the main laser beam and the auxiliary laser beam are the same, under the control of the scanning galvanometer and f-θ field lens of the main laser and the scanning galvanometer and f-θ field lens of the auxiliary laser, the main laser beam and the auxiliary laser beam can reach any position in the forming area; the main laser beam is shaped into a ring-shaped spot through the first diffractive optical element, and the auxiliary laser beam is shaped into a flat-top spot through the second diffractive optical element; the power of the auxiliary laser should be lower than that of the main laser, and the spot size is adjusted through the variable magnification beam expander, and the auxiliary laser beam only acts on the rear end of the molten pool to compensate heat and adjust the local molten pool temperature gradient.

[0009] Further, displacement lifting systems are arranged in the powder supply bin, the forming bin and the recycling bin, and the three displacement lifting systems and the powder laying scraper are cooperated to realize layer-by-layer powder laying and repairing.

[0010] Further, a part to be repaired fixing device is arranged in the forming bin, and the part to be repaired fixing device is fixed according to the shape of the part to be repaired and the geometric shape of the repairing surface.

[0011] Further, the protective gas in the protective gas device is high-purity argon with a content of 99.999%.

[0012] The application also provides a repairing method for adjusting the solidification molten pool heat compensation of the heat source mode, based on the repairing device for adjusting the solidification molten pool heat compensation of the heat source mode in the above claims 1-5, and specifically includes the following steps: Step 1, establishment of a repairing model and slice processing, a three-dimensional scanner is used to scan a damaged part to obtain a part to be repaired model, a damaged area is determined and reverse modeling is performed to obtain a repairing model, and then slice processing is performed on the repairing model; Step 2, pretreatment of a damaged part, a damaged part is cut to obtain a flat surface to be repaired, and the surface to be repaired is cleaned; Step 3, installation and fixing of a part to be repaired, a professional clamp is used to clamp and fix the part to be repaired in a forming bin, the clamping angle is adjusted to keep the surface to be repaired horizontal, and then the coordinate position of the repairing model is accurately determined according to the placement position of the part to be repaired; Step 4, printing parameter setting, laser repairing and forming are performed on the part to be repaired according to the slice information of the repairing model; Step 5, after repairing the area, the repaired part is scanned by a three-dimensional scanner, the obtained repaired part model is compared with the repaired model obtained in step 1, the surface machining allowance is removed to meet the size and precision requirements of the part, and then the porosity and crack defects of the repaired area are non-destructively detected, and finally the part repair is completed.

[0013] Further, the step 2 is specifically: using a wire cutting process to cut off the damaged part of the part, and using acetone or anhydrous ethanol to clean the surface to be repaired.

[0014] Further, the setting of the printing parameters in step 4 specifically includes: setting the laser power and the laser opening and closing time of the main laser and the auxiliary laser, setting the scanning speed and movement path of the main laser beam and the auxiliary laser beam, setting the variable magnification beam expander magnification to adjust the energy distribution of the auxiliary laser beam, and setting the powder layer thickness.

[0015] Further, the non-destructive detection in step 5 includes one or more of ultrasonic waves, X-rays or fluorescence.

[0016] Further, the method is suitable for high-quality batch repair of high-temperature alloy hot end parts such as nozzles, blades and combustion chambers of aero-engines and gas turbines in the field of aerospace.

[0017] The application adopts a ring laser as a main laser, introduces a heat compensation auxiliary laser beam, adjusts the heat source mode by combining a variable magnification laser beam expander, compensates the heat of the rear end area of the molten pool, and performs double-beam laser powder bed fusion repair. By regulating the temperature gradient and solidification speed in the molten pool through the heat compensation beam, the formation of heterogeneous crystals in the laser powder bed fusion repair process can be effectively inhibited, the porosity and crack defects can be reduced, and the repair quality can be improved. Specifically as follows: (1) For the problem of heterogeneous crystals: the rear end area of the molten pool is heat compensated to avoid grain nucleation and growth caused by severe surface radiation heat dissipation.

[0018] (2) For the problem of porosity: the ring-shaped spot can improve the stability of the molten pool, thereby reducing the generation of pores; the heat compensation of the rear end of the molten pool can prolong the solidification time of the molten pool, which is beneficial to the full escape of bubbles; at the same time, the additional energy input provided by the heat compensation beam can effectively alleviate the insufficient fusion phenomenon caused by insufficient energy input or too large scanning pitch.

[0019] (3) For the problem of cracks: the heat stress in the solidification process is relieved by the heat compensation technology, and the residual stress level is reduced, thereby effectively inhibiting the crack initiation and expansion.

[0020] Compared with the prior art, the application has the following beneficial technical effects: 1. The laser powder bed fusion technology is used to realize high-quality repair of complex precision parts. A ring laser is used as a main laser to effectively improve the stability of the molten pool. At the same time, an auxiliary laser heat source is introduced to compensate for the heat at the back end of the molten pool, and the distance between the two laser beams, the energy distribution and the spot size of the auxiliary laser beam are cooperatively controlled to realize accurate control of the heat distribution of the molten pool. This strategy optimizes the temperature gradient and solidification speed during solidification, thereby significantly inhibiting key defects such as mixed crystals, pores and cracks during laser powder bed fusion repair of single crystal parts.

[0021] 2. The combination of variable magnification laser beam expander can provide a larger heat compensation range, thereby expanding the process window of laser powder bed fusion repair, so that the process window of the present application is large and flexible (real-time monitoring + closed-loop control). At the same time, the heat input and distribution of the laser can be adjusted in real time and dynamically combined with in-situ molten pool monitoring data.

[0022] 3. The material of the present application is adaptable, and the parameters of the dual-beam laser can be independently controlled. The process parameters can be applied to the repair and forming of various materials.

[0023] 4. The present application only needs to adjust the optical system module of the existing laser powder bed fusion equipment (add corresponding auxiliary laser configuration, diffractive optical element and variable magnification laser beam expander), which is simple to assemble and easy to realize industrialization. The main / auxiliary laser uses a separate control system, which can meet different production needs.

[0024] 5. Online quality monitoring technology can be equipped in the equipment, which integrates infrared temperature measurement, high-speed photography and other technologies to monitor the molten pool state in real time. Through the analysis of in-situ data, the laser parameters are adjusted in real time to ensure the processing and repair quality of each batch of products.

[0025] The present application is suitable for high-quality batch repair of high-temperature alloy hot end parts such as nozzles, blades and combustion chambers of aero-engines and gas turbines in the field of aerospace, which greatly reduces the maintenance cost of aero-engines.

[0026] The concept, specific structure and technical effects of the present application will be further described in combination with the drawings to fully understand the purpose, features and effects of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of a repair device for adjusting the heat source mode of the solidification molten pool heat compensation of a preferred embodiment of the present application; Wherein: 101 - forming bin; 102 - powder supply bin; 103 - powder; 104 - powder spreading blade; 105 - part to be repaired; 106 - recycling bin; 201 - vacuum system; 202 - main laser; 203 - first diffractive optical element; 204 - auxiliary laser; 205 - second diffractive optical element; 206 - variable magnification beam expander; 207 - scanning galvanometer and f-θ field lens of auxiliary laser; 208 - scanning galvanometer and f-θ field lens of main laser; 209 - protective gas bottle; Figure 2 is a schematic diagram of the molten pool cross section when the prior art uses Gaussian laser for single crystal repair, and the diagram from left to right is sequentially: (a) a schematic diagram of the molten pool cross section perpendicular to the laser action area in the scanning direction, (b) a schematic diagram of the molten pool cross section parallel to the scanning direction, and (c) a schematic diagram of the molten pool tail end cross section perpendicular to the scanning direction; Figure 3 is a schematic diagram of the molten pool cross section when the embodiment of the present application uses flat-top spot auxiliary laser for tail end heat compensation, and the diagram from left to right is sequentially: (a) a schematic diagram of the molten pool cross section perpendicular to the laser action area in the scanning direction, (b) a schematic diagram of the molten pool cross section parallel to the scanning direction, and (c) a schematic diagram of the molten pool tail end cross section perpendicular to the scanning direction. DETAILED DESCRIPTION

[0028] The following reference to the drawings of the specification introduces a plurality of preferred embodiments of the present application, so that its technical content is more clear and convenient to understand. The present application can be embodied in many different forms of embodiments, and the protection scope of the present application is not limited to the embodiments mentioned in the text.

[0029] In the drawings, the same components of structure are denoted by the same reference numerals, and the components of similar structure or function are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present application does not limit the size and thickness of each component. In order to make the drawing clearer, the thickness of some components is appropriately exaggerated in some places in the drawings.

[0030] As shown in Figure 1 is a schematic diagram of a repair device combining variable magnification beam expander to adjust heat source mode and solidification molten pool heat compensation, which comprises a forming environment system, an optical system and a laser powder bed fusion cavity system, wherein the forming environment system comprises a vacuum device 201 and a protective gas device 209; the optical system comprises a main laser 202, a first diffractive optical element 203, a scanning galvanometer and f-θ field lens 208 of the main laser, an auxiliary laser 204, a second diffractive optical element 205, a variable magnification beam expander 206 and a scanning galvanometer and f-θ field lens 207 of the auxiliary laser; the laser powder bed fusion cavity system comprises a forming bin 101, a powder supply bin 102, a powder 103, a powder spreading blade 104, a part to be repaired 105 and a recycling bin 106.

[0031] All devices in the optical system are connected with the computer, and the operation and parameter setting of each device are controlled by the computer. The moving speed and path of the main laser beam and the auxiliary laser beam are the same, and the beams can reach any position in the forming area under the control of the scanning galvanometer and f-θ field lens 208 of the main laser and the scanning galvanometer and f-θ field lens 207 of the auxiliary laser. The main laser beam is shaped into a ring-shaped spot by the first diffractive optical element 203, and the auxiliary laser beam is shaped into a flat-top spot by the second diffractive optical element 205. The power of the auxiliary laser should be lower than that of the main laser, and the spot size is adjusted by the variable magnification beam expander 206. The auxiliary laser beam only acts on the back end of the molten pool, which is used for heat compensation to adjust the local temperature gradient, and does not participate in the molten pool forming process.

[0032] The displacement lifting system is arranged in the powder supply bin 102, the forming bin 101 and the recycling bin 106, and the powder is laid layer by layer and repaired through the cooperation of the three displacement lifting systems and the powder laying scraper 104.

[0033] The fixing device for the part to be repaired is arranged in the forming bin 101, and the clamping and fixing should be made according to the shape of the part to be repaired and the geometric shape of the repaired surface and other conditions.

[0034] The protective gas in the protective gas device 209 is high-purity argon with a content of 99.999%.

[0035] A repair method combining variable magnification beam expander to adjust the heat source mode of solidification molten pool heat compensation, specifically comprising the following steps: Step 1, establishment of repair model and slice processing. The damaged part model is obtained by scanning the damaged part with a three-dimensional scanner, the damaged area is determined, and the repair model is obtained by reverse modeling, and then the repair model is processed by slicing; Step 2, pretreatment of damaged part. The damaged part of the part is cut off by wire cutting process to obtain a smooth surface to be repaired, and the surface to be repaired is cleaned with acetone or anhydrous ethanol; Step 3, installation and fixation of the part to be repaired. The part to be repaired 105 is clamped and fixed in the forming bin 101 by using a professional clamp, and the clamping angle is adjusted to keep the surface to be repaired horizontal. Then according to the placement position of the part to be repaired, the coordinate position of the repair model is accurately determined; Step 4, setting of printing parameters. The laser power of the main laser 202 and the auxiliary laser 204 and the opening and closing time of the laser are set, the scanning speed and moving path of the main laser beam and the auxiliary laser beam are set, the magnification of the variable magnification beam expander 206 is set to adjust the energy distribution of the auxiliary laser beam, and the powder layer thickness is set; according to the slice information of the repair model, the part to be repaired 105 is repaired and formed by laser; Step 5, post-processing of the repaired area. The repaired part is scanned by a three-dimensional scanner, and the obtained repaired part model is compared with the repair model obtained in step 1 to remove the surface machining allowance to meet the size and accuracy requirements of the part. Then, ultrasonic, X-ray, fluorescence and other means are used to detect defects such as pores and cracks in the repaired area, and finally the part repair is completed.

[0036] The application adopts a ring laser as a main laser, increases a heat compensation auxiliary laser beam, and adjusts a heat source mode by combining a variable power laser beam expander to compensate heat for the rear end area of the molten pool, and performs double-beam laser powder bed fusion repair.

[0037] Figure 2 is a schematic diagram of the molten pool cross section when the prior art uses a Gaussian laser for single crystal repair. The center intensity of the Gaussian spot is high, forming a deep and narrow molten pool, and the temperature gradient at the rear end of the molten pool is small. During solidification, due to the composition undercooling effect and the severe heat dissipation of the molten pool surface, new grains are easily nucleated and grown at the top of the molten pool at the end of solidification.

[0038] Figure 3 is a schematic diagram of the molten pool cross section in the repair process in the embodiment of the application. The method uses a ring laser as a main laser, introduces a heat compensation auxiliary flat-top laser beam, and adjusts a heat source mode by combining a variable power laser beam expander to compensate heat for the rear end area of the molten pool. The molten pool produced by the ring spot is wide and shallow, and the heat compensation effect significantly improves the temperature gradient at the rear edge of the molten pool, thereby effectively inhibiting the nucleation and growth of grains caused by the severe surface radiation heat dissipation.

[0039] The above detailed the preferred embodiments of the application. It should be understood that those skilled in the art can make many modifications and changes to the application without creative labor based on the concept of the application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment based on the prior art according to the concept of the application should be within the protection scope determined by the claims.

Claims

1. A repair device for adjusting the solidification melt zone thermal compensation of a heat source mode, characterized by, The molding environment system includes a vacuum device and a protective gas device, the optical system includes a main laser, a first diffractive optical element, a scanning galvanometer and an f-θ field mirror of the main laser, an auxiliary laser, a second diffractive optical element, a variable magnification beam expander and a scanning galvanometer and an f-θ field mirror of the auxiliary laser, and the laser powder bed melting cavity system includes a molding bin, a powder supply bin, powder, a powder spreading knife, a part to be repaired and a recycling bin.

2. The repair device to adjust the solidification melt zone thermal compensation for heat source mode of claim 1, wherein, All devices in the optical system are connected with a computer, and the operation and parameter setting of each device are controlled by the computer. The moving speed and path of the main laser beam and the auxiliary laser beam are the same. Under the control of the scanning galvanometer and the f-θ field mirror of the main laser and the scanning galvanometer and the f-θ field mirror of the auxiliary laser, the main laser beam and the auxiliary laser beam can reach any position in the molding area. The first diffractive optical element is used to shape the main laser beam into a ring-shaped spot, and the second diffractive optical element is used to shape the auxiliary laser beam into a flat-top spot. The power of the auxiliary laser should be lower than that of the main laser, and the spot size of the auxiliary laser beam is adjusted by the variable magnification beam expander. The auxiliary laser beam only acts on the rear end of the molten pool, and is used for heat compensation and adjustment of local molten pool temperature gradient.

3. The repair device to adjust the solidification melt zone thermal compensation for heat source mode of claim 1, wherein, Displacement lifting systems are arranged in the powder supply bin, the molding bin and the recycling bin, and layer-by-layer powder spreading and repair are realized through the cooperation of the three displacement lifting systems and the powder spreading knife.

4. The repair device to adjust the solidification melt zone thermal compensation for heat source patterns of claim 1, wherein, A part to be repaired fixing device is arranged in the molding bin, and the fixing device is fixed according to the shape of the part to be repaired and the geometric shape of the repair surface.

5. The repair device to adjust the solidification melt zone thermal compensation for heat source patterns of claim 1, wherein, The protective gas in the protective gas bottle of the protective gas device is high-purity argon with a content of 99.999%.

6. A repair method of adjusting the solidification zone thermal compensation of a heat source mode, characterized in that, The method is based on the repair device for adjusting the heat source mode of the solidification molten pool heat compensation in claims 1-5, and specifically includes the following steps: Step 1: Establishment of a repair model and slice processing. A three-dimensional scanner is used to scan a damaged part to obtain a part to be repaired model, determine the damaged area, and obtain a repair model through reverse modeling. Then, the repair model is processed by slicing. Step 2: Pretreatment of the damaged part. The damaged part is cut to obtain a flat repair surface, and the repair surface is cleaned. Step 3: Installation and fixing of the part to be repaired. A professional clamp is used to clamp and fix the part to be repaired in the molding bin, and the clamping angle is adjusted to keep the repair surface horizontal. Then, the coordinate position of the repair model is accurately determined according to the placement position of the part to be repaired. Step 4: Setting of printing parameters. Laser repair molding is performed on the part to be repaired according to the slice information of the repair model. Step 5, after repairing the area, the repaired part is scanned by a three-dimensional scanner, the obtained repaired part model is compared with the repaired model obtained in step 1, the surface machining allowance is removed to meet the size and precision requirements of the part, then the non-destructive detection of the repaired area pores and cracks is performed, and finally the part repair is completed.

7. The repair method of solidifying a melt zone with thermal compensation as defined in claim 6, wherein, The step 2 specifically comprises: using a wire cutting process to cut off the damaged part of the part, and using acetone or anhydrous ethanol to clean the surface to be repaired.

8. The repair method of solidifying a melt zone with thermal compensation as defined in claim 6, wherein, The setting of the printing parameters in step 4 specifically comprises: setting the laser power and the laser opening and closing time of the main laser and the auxiliary laser, setting the scanning speed and moving path of the main laser beam and the auxiliary laser beam, setting the variable magnification beam expander magnification to adjust the energy distribution of the auxiliary laser beam, and setting the powder layer thickness.

9. The repair method of solidifying a melt zone with thermal compensation as defined in claim 6, wherein, The technical means of non-destructive detection in step 5 comprises one or more of ultrasonic wave, X-ray or fluorescence.

10. The repair method of solidifying a melt zone with thermal compensation as defined in claim 6, wherein, The method is suitable for high-quality batch repair of high-temperature alloy hot end parts such as nozzles, blades and combustion chambers of aero-engines and gas turbines in the field of aerospace.

Images