Underwater ultrasonic impact composite laser powder feeding additive repair device and method

Abstract

The application discloses an underwater ultrasonic impact composite laser powder feeding additive repair device and method, and the repair device comprises a laser, a gas supply device, an underwater laser cladding head, a powder feeder, an ultrasonic generator and an underwater ultrasonic impact head; the laser is connected with the underwater laser cladding head through an optical fiber; the underwater laser cladding head is connected with the gas supply device; the powder feeder is connected with the gas supply device and conveys additive powder to the underwater laser cladding head through a powder feeding pipe; the gas supply device is used for providing inert gas; the underwater laser cladding head is used for underwater additive repair; the ultrasonic generator is connected with the underwater ultrasonic impact head; the underwater ultrasonic impact head is connected with the gas supply device; and the underwater laser cladding head and the underwater ultrasonic impact head are both provided with a drainage device. The drainage device is used for draining water during underwater repair, so that a dry area is formed at a repair position, in-situ repair can be directly carried out underwater, it is not necessary to stop the stack to drain water, the repair efficiency is improved, and the repair cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of underwater laser additive manufacturing technology, and in particular to an underwater ultrasonic shock composite laser powder delivery additive repair device and method. Background Technology

[0002] The nuclear industry is a crucial pillar of national security and energy transition. Nuclear equipment structural components, due to long-term operation in extreme environments of high temperature, high pressure, strong radiation, and seawater corrosion, are prone to fatigue cracks and corrosion damage, significantly reducing their service life and safety performance, thus necessitating repair. Traditional repair methods require reactor shutdown and dewatering, which are costly and pose a risk of nuclear leakage. Therefore, there is a need to develop in-situ rapid and high-quality repair technologies for underwater in-service components.

[0003] Common underwater repair techniques include artificial underwater arc welding, which uses an electric arc heat source to melt the welding rod and the workpiece, forming a weld after solidification. However, this method suffers from poor repair quality and stability due to water exposure, and also poses risks to personnel safety. Underwater local dry laser powder feeding additive manufacturing technology can repair underwater structural components in situ. It uses a drainage device to create a local dry cavity in the laser processing area, mitigating water damage, and achieves rapid repair of underwater structural components through layer-by-layer deposition. However, during underwater laser additive repair, the strong cold confinement effect induced by the water medium results in an extremely high cooling rate and temperature gradient in the molten pool. This extreme non-equilibrium solidification condition easily leads to metallurgical defects (porosity, lack of fusion, microcracks, etc.) and high residual tensile stress in the deposited layer; furthermore, the microstructure exhibits a columnar crystalline structure with anisotropic properties. This microstructure-stress coupling effect easily leads to a reversal of the strong-plasticity of the underwater repair layer, making it difficult to meet the comprehensive requirements of excellent strong-plasticity for repaired parts in practical applications. Summary of the Invention

[0004] Purpose of the invention: To address the above-mentioned shortcomings, the present invention provides an underwater ultrasonic shock combined with laser powder delivery additive repair device and method.

[0005] Technical solution: To solve the above problems, the present invention adopts an underwater ultrasonic impact composite laser powder delivery additive repair device, including an underwater laser powder delivery additive unit and an underwater ultrasonic impact unit;

[0006] The underwater laser powder feeding additive manufacturing unit includes a laser, a gas supply device, an underwater laser cladding head, a first moving device, and a powder feeder. The laser is connected to the underwater laser cladding head via an optical fiber. The underwater laser cladding head is connected to the first moving device and also to the gas supply device. The powder feeder is connected to the gas supply device and delivers additive powder to the underwater laser cladding head through a powder feeding pipe. The gas supply device provides inert gas. The underwater laser cladding head is used for underwater additive repair and is equipped with a drainage device.

[0007] The underwater ultrasonic impact unit includes an ultrasonic generator, an underwater ultrasonic impact head, and a second moving device. The ultrasonic generator is connected to the underwater ultrasonic impact head, the underwater ultrasonic impact head is connected to the second moving device, the underwater ultrasonic impact head is also connected to an air supply device, and a drainage device is also provided on the underwater ultrasonic impact head.

[0008] Furthermore, the underwater laser cladding head includes a cladding nozzle and a cladding head drainage cover disposed outside the cladding nozzle. An optical lens group is provided on the top of the cladding nozzle, and a cavity is opened in the middle of the cladding nozzle. The laser generated by the laser enters the cavity through the optical lens group and is emitted from the outlet of the cladding nozzle. The cladding nozzle is also provided with an air inlet channel and a powder feeding channel. One end of the air inlet channel is connected to the air supply device, and the other end of the air inlet channel is connected to the cavity. The powder feeding channel is connected to the powder feeder.

[0009] Furthermore, the cladding head drainage cover includes an outer drainage cover and an inner drainage cover. The inner drainage cover surrounds the outside of the cladding nozzle, and the outer drainage cover surrounds the outside of the inner drainage cover. The inner drainage cover includes an air inlet, a gas diffusion chamber, a metal foam layer, a rectifier chamber, and a lower air outlet chamber arranged sequentially from top to bottom. The air inlet is connected to the air supply device. The outer drainage cover has a first drainage chamber inside and is also connected to the air supply device.

[0010] Furthermore, the optical lens assembly includes a collimation protection lens, a collimation lens, a focusing lens, and a focusing protection lens arranged layer by layer from top to bottom.

[0011] Furthermore, the diameter of the gas diffusion cavity is larger than the diameter of the air inlet, the metal foam layer is filled with a porous metal material with a porosity greater than 90%, and the material is one of aluminum, nickel, or copper; the rectifier cavity is provided with a honeycomb cavity.

[0012] Furthermore, the axis of the air inlet is at an angle of 20-40° to the axis of the cladding nozzle, and the axis of the outlet of the lower air chamber is parallel to the axis of the cladding nozzle; the axis of the bottom outlet of the first drainage chamber is at an angle of 0-30° to the cladding nozzle, and the upper part of the first drainage chamber is at an angle of 60-90° to the axis of the cladding nozzle.

[0013] Furthermore, the underwater ultrasonic impact head includes a shell, an ultrasonic transducer, an impact needle, and an impact head drainage cover. The ultrasonic transducer is disposed inside the shell, and the impact head drainage cover is disposed around the bottom outer side of the shell. The impact needle is installed at the bottom of the ultrasonic transducer, and the bottom of the shell has an opening for the impact needle to extend out. The ultrasonic transducer is connected to an ultrasonic generator, and the impact head drainage cover has a second drainage chamber, which is connected to an air supply device.

[0014] This invention also provides a repair method using the above-mentioned underwater ultrasonic shock combined with laser powder delivery additive repair device, comprising the following steps:

[0015] Step 1: Turn on the gas supply device to deliver inert gas to the underwater laser cladding head, and start the first moving device to drive the underwater laser cladding head to the area to be repaired;

[0016] Step 2: Turn on the laser and powder feeder. The first moving device drives the underwater laser cladding head to perform single-layer repair on the area to be repaired. After the repair is completed, turn off the laser and powder feeder, and the underwater laser cladding head leaves the repair area.

[0017] Step 3: Turn on the gas supply device to deliver inert gas to the underwater ultrasonic impact head, and turn on the second moving device to drive the underwater ultrasonic impact head to the area to be repaired.

[0018] Step 4: Turn on the ultrasonic generator. The second moving device drives the underwater ultrasonic impact head to perform ultrasonic impact on the repair layer after the repair in Step 2. After the impact is completed, the underwater ultrasonic impact head leaves the repair area.

[0019] Step 5: Repeat steps 1 to 4 a preset number of times until the area to be repaired is repaired, and the underwater laser cladding head and underwater ultrasonic impact head leave the repair area.

[0020] Furthermore, the laser power is 1600-2600W, the scanning speed is 10-15mm / s; the powder feeder has a powder feeding rate of 0.6-1.5g / min; the gas supply device delivers a protective gas flow rate of 10-30L / min, a powder-carrying gas flow rate of 5-15L / min, an inner drainage cover gas flow rate of 30-70L / min, and an outer drainage cover flow rate of 30-70L / min to the underwater laser cladding head.

[0021] Furthermore, the underwater ultrasonic impact head has an ultrasonic power of 600~1000W and a single-layer impact frequency of 1~3 times.

[0022] Beneficial effects: Compared with the prior art, the significant advantages of this invention are: (1) Both the underwater laser cladding head and the underwater ultrasonic impact head are equipped with drainage devices, which drain water during the underwater repair process, making the repaired area a dry area, allowing for direct in-situ repair underwater without stopping the pile for drainage, thus improving repair efficiency and reducing repair costs; (2) The underwater environment can increase the cooling rate of the molten pool and refine the grains. The underwater environment can also reduce the thickness of the remelting zone during laser additive manufacturing, thereby reducing the weakening effect of the next layer of laser additive manufacturing on the previous layer of ultrasonic impact zone; (3) After each single-layer repair is completed, the repair layer is subjected to Compared with ultrasonic impact only on the surface of the material after repair, ultrasonic impact can further refine the grains of the deposited layer and promote the transformation of columnar crystal structure to equiaxed crystal structure, forming gradient grains from the surface to the inside, improving the plasticity and strength of the repaired area. In addition, underwater in-situ ultrasonic impact can introduce compressive stress in the deposited layer, reduce metallurgical defects such as microcracks and pores and residual tensile stress formed during laser additive manufacturing, and improve the strength of the repaired area, thereby achieving a synergistic improvement effect on the strength and plasticity of the repaired area; (4) The underwater laser cladding head adopts a double-layer drainage cover structure, which makes the local dry area more stable and improves the stability of the laser additive manufacturing process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the repair device of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of the underwater laser cladding head of the present invention;

[0025] Figure 3 This is a cross-sectional view of the underwater laser cladding head of the present invention;

[0026] Figure 4 This is a schematic diagram of the overall structure of the underwater ultrasonic impact head of the present invention;

[0027] Figure 5 This is a cross-sectional view of the underwater ultrasonic impact head of the present invention;

[0028] Figure 6 This is a surface morphology diagram of the underwater cladding layer after ultrasonic impact according to the present invention;

[0029] Figure 7 This is a microstructure diagram of the underwater cladding layer after ultrasonic impact according to the present invention. Detailed Implementation

[0030] like Figure 1As shown in this embodiment, an underwater ultrasonic impact composite laser powder feeding additive repair device includes an underwater laser powder feeding additive unit and an underwater ultrasonic impact unit. The underwater laser powder feeding additive unit includes a laser 1, a gas supply device 2, an underwater laser cladding head 9, a first moving device 11, a powder feeder 12, and a first industrial control computer 13. The laser 1 is connected to the underwater laser cladding head 9 via an optical fiber. The underwater laser cladding head 9 is connected to the first moving device 11, which is an industrial robot used to move the underwater laser cladding head 9 to a designated position. The underwater laser cladding head 9 is also connected to the gas supply device 2, which is a gas cylinder containing inert gas. A flow meter is installed at the outlet of the gas cylinder to control the gas flow rate. The powder feeder 12 is connected to the gas supply device 2 and delivers additive powder to the underwater laser cladding head through a powder feeding pipe. The laser 1, the first moving device 11, and the powder feeder 12 are all connected to the first industrial control computer 13, which controls the equipment and adjusts process parameters.

[0031] The underwater ultrasonic impact unit includes an ultrasonic generator 3, an underwater ultrasonic impact head 7, a second moving device 5, and a second industrial control computer 4. The ultrasonic generator 3 is connected to the underwater ultrasonic impact head 7, and the underwater ultrasonic impact head 7 is connected to the second moving device 5, which is also an industrial robot used to move the underwater ultrasonic impact head 7 to a designated position. The underwater ultrasonic impact head 7 is also connected to an air supply device 2, and the second moving device 5 is connected to the second industrial control computer 4, which controls the equipment and adjusts process parameters.

[0032] like Figure 2 and Figure 3 As shown, the underwater laser cladding head 9 includes a cladding nozzle 94 and a cladding head drainage cover disposed outside the cladding nozzle 94. An optical lens group 92 is provided at the top of the cladding nozzle 94, comprising a collimating protective lens, a collimating lens, a focusing lens, and a focusing protective lens arranged layer by layer from top to bottom. A cavity 911 is opened in the middle of the cladding nozzle 94. The laser generated by the laser 1 enters the cavity 911 through the optical lens group 92 and exits from the outlet of the cladding nozzle 94. An air inlet channel 91 and a powder feeding channel 93 are also provided inside the cladding nozzle 94. One end of the air inlet channel 91 is connected to the air supply device 2, and the other end is connected to the cavity 911. Inert gas is introduced into the air inlet channel 91, which, on the one hand, discharges water from the inner cavity of the laser cladding head through airflow, and on the other hand, creates an inert atmosphere at the outlet of the cladding nozzle 94, preventing oxidation of the molten pool during the repair process. The powder feeding channel 93 is connected to the powder feeder 12 and is used to transport additive powder. Four powder feeding channels 93 are provided on the cladding nozzle 94. The four powder feeding channels 93 are inclined inwards so that their axes intersect at a single point, where the laser also converges. This point is the repair location. The laser provides laser energy, the powder feeder transports powder, and the laser and powder converge in the repair area. The laser melts the powder and the repair area to form a molten pool. After the molten pool cools, a single-layer repair layer is formed.

[0033] The cladding head drainage cover includes an outer drainage cover and an inner drainage cover. The inner drainage cover surrounds the outside of the cladding nozzle 94, and the outer drainage cover surrounds the outside of the inner drainage cover. The inner drainage cover includes, from top to bottom, an air inlet 95, a gas diffusion chamber 96, a metal foam layer 97, a rectifier chamber 98, and a lower air outlet chamber 99. The air inlet 95 is connected to the air supply device 2. The air inlet 95 adopts a one-to-two or two-to-four air distribution method. The axis of the air inlet 95 forms an angle of 20-40° with the axis of the cladding nozzle 94. In this embodiment, it is 30°. The diameter of the gas diffusion chamber 96 is larger than the diameter of the air inlet 95, and it is used to evenly distribute the gas entering from the air inlet 95 in a circumferential direction. The height of the gas diffusion chamber 96 is 6mm. The metal foam layer 97 is filled with a porous metal material with a porosity greater than 90%. The material is one of aluminum, nickel, or copper; in this embodiment, aluminum is used. The material has a thickness of 5 mm and a pore size of 0.5 mm. Gas passing through the metal foam layer reduces large-scale eddies and uneven flow fields, resulting in a more uniform airflow velocity distribution. The rectifying cavity 98 contains a honeycomb-shaped cavity with a side length of 3 mm and a height of 15 mm. This rectifying cavity reduces lateral airflow velocity and minimizes turbulence. The flow channel of the lower exhaust cavity 99 consists of curves and straight lines, with the outlet axis parallel to the axis of the cladding nozzle 94.

[0034] The outer drainage cover is located outside the inner drainage cover and is connected by threads. The outer drainage cover has a first drainage chamber 910. The upper inlet axis of the first drainage chamber 910 is perpendicular to the axis of the cladding nozzle 94, the bottom of the outlet is flush with the bottom of the inner drainage cover, and the outlet is parallel to the axis of the cladding nozzle 94. The upper inlet of the first drainage chamber 910 is also connected to the gas supply device 2. The gas supply device 2 delivers high-pressure gas to the air inlet 95 and the upper inlet of the first drainage chamber 910. The airflow flows out from the lower outlet chamber 99 and the lower outlet of the first drainage chamber 910 to prevent water from the outside from entering the inner cavity of the laser cladding head.

[0035] The cladding head drainage hood adopts a double-layer drainage hood structure. On one hand, it serves a drainage function; on the other hand, it creates a localized inert atmosphere in the laser cladding area, preventing oxidation of the molten pool during laser cladding. Furthermore, the inner drainage hood employs a multi-layered composite structure, making the outlet airflow more uniform and reducing turbulence. The outer drainage hood resists external water flow. The localized dry zone created by the double-layer drainage hood structure is more stable, improving the stability of the laser additive manufacturing process.

[0036] like Figure 4 and Figure 5As shown, the underwater ultrasonic impact head 7 includes a housing 71, an ultrasonic transducer 72, an impact pin 73, and an impact head drainage cover 74. The ultrasonic transducer 72 is disposed inside the housing 71, and the impact head drainage cover 74 is disposed around the bottom outer side of the housing 71. The impact pin 73 is installed at the bottom of the ultrasonic transducer 72, and the bottom of the housing 71 has an opening for the impact pin 73 to extend out. The ultrasonic transducer 72 is connected to an ultrasonic generator 3, which generates ultrasonic waves of preset power, which are transmitted to the impact pin 73 through the ultrasonic transducer 72 to perform ultrasonic impact on the repair area.

[0037] The impact head drainage cover 74 has a second drainage chamber, which is connected to the air supply device 2. The axis of the upper inlet of the second drainage chamber is perpendicular to the axis of the impact needle 73, and the axis of the lower outlet of the second drainage chamber is parallel to the axis of the impact needle 73. The connection between the upper inlet of the second drainage chamber and the air supply device forms a stable local dry cavity around the impact needle 73, ensuring that the impact needle 73 is not affected by water flow during the impact process and improving the impact quality.

[0038] This embodiment also provides a repair method for the above-mentioned underwater ultrasonic shock composite laser powder delivery additive repair device, including the following steps:

[0039] Step 1: The surface to be repaired, 8, is located inside the water tank 10, which is placed on the workbench 6. The gas supply device 2 is turned on to supply inert gas to the underwater laser cladding head 9. The first moving device 11 is activated to move the underwater laser cladding head 9 to the area to be repaired. High-pressure gas enters the underwater laser cladding head 9, discharging the water from its inner cavity and clearing the water flow around the outlet of the cladding head, creating a dry and inert gas atmosphere. In this embodiment, the protective gas flow rate of the underwater laser cladding head 9 is 22 L / min, the powder-carrying gas flow rate is 10 L / min, the inner drainage cover gas flow rate is 40 L / min, and the outer drainage cover flow rate is 40 L / min.

[0040] Step 2: Turn on laser 1 and powder feeder 12. The first moving device 11 drives the underwater laser cladding head 9 to perform single-layer repair on the area to be repaired. After the repair is completed, turn off laser 1 and powder feeder 12, and the underwater laser cladding head 9 leaves the repair area. In this embodiment, TC4 titanium alloy powder is used for repair, with a laser power of 2100W, a scanning speed of 11mm / s, and a powder feeding rate of 1g / min.

[0041] Step 3: Turn on the gas supply device 2 to deliver inert gas to the underwater ultrasonic impact head 7 to form a dry zone around the impact needle. Then, turn on the second moving device 5 to move the underwater ultrasonic impact head 7 to the area to be repaired.

[0042] Step 4: Turn on the ultrasonic generator 3. The second moving device 5 drives the underwater ultrasonic impact head 7 to perform ultrasonic impact on the repaired layer after step 2. The ultrasonic power is 1000W, and the single layer is impacted twice. After the impact is completed, the underwater ultrasonic impact head 7 leaves the repair area.

[0043] Step 5: Repeat steps 1 to 4 a preset number of times until the area to be repaired is repaired. Then, the underwater laser cladding head 9 and the underwater ultrasonic impact head 7 leave the repair area.

[0044] This invention enables in-situ repair directly underwater. The underwater environment increases the cooling rate of the molten pool, refines the grains, and reduces the thickness of the remelted zone during laser additive manufacturing. This reduces the weakening effect of subsequent laser additive manufacturing layers on the ultrasonic impact zone of the previous layer. Layer-by-layer ultrasonic impact, compared to ultrasonic impact only on the surface of the repaired material, further refines the grains of the deposited layer and promotes the transformation of columnar crystal structure to equiaxed crystal structure, forming a gradient grain from the surface inward, thus improving the plasticity and strength of the repaired area. Furthermore, in-situ underwater ultrasonic impact introduces compressive stress into the deposited layer, reducing metallurgical defects such as microcracks and pores formed during laser additive manufacturing, as well as residual tensile stress, thereby increasing the strength of the repaired area and achieving a synergistic improvement in both strength and plasticity. Figure 6 As shown, after ultrasonic impact, the wavy undulations and burrs on the surface of the cladding layer decreased, and the surface roughness was reduced to 5.21. Figure 7 As shown, after ultrasonic impact, the coarse columnar crystals of the underwater cladding layer are transformed into fine equiaxed crystals, and the grain size is refined.

Claims

1. An underwater ultrasonic shock combined with laser powder delivery additive repair device, characterized in that, Includes an underwater laser powder delivery additive manufacturing unit and an underwater ultrasonic impact unit; The underwater laser powder feeding additive manufacturing unit includes a laser (1), an air supply device (2), an underwater laser cladding head (9), a first moving device (11), and a powder feeder (12). The laser (1) is connected to the underwater laser cladding head (9) via an optical fiber. The underwater laser cladding head (9) is connected to the first moving device (11). The underwater laser cladding head (9) is also connected to the air supply device (2). The powder feeder (12) is connected to the air supply device (2) and delivers additive powder to the underwater laser cladding head via a powder feeding pipe. The air supply device (2) is used to provide inert gas. The underwater laser cladding head (9) is used for underwater additive repair. A drainage device is provided on the underwater laser cladding head (9). The underwater ultrasonic impact unit includes an ultrasonic generator (3), an underwater ultrasonic impact head (7), and a second moving device (5). The ultrasonic generator (3) is connected to the underwater ultrasonic impact head (7), the underwater ultrasonic impact head (7) is connected to the second moving device (5), the underwater ultrasonic impact head (7) is also connected to the air supply device (2), and a drainage device is also provided on the underwater ultrasonic impact head (7).

2. The underwater ultrasonic shock combined with laser powder delivery additive repair device as described in claim 1, characterized in that, The underwater laser cladding head (9) includes a cladding nozzle (94) and a cladding head drainage cover located outside the cladding nozzle (94). An optical lens group (92) is provided on the top of the cladding nozzle (94). A cavity (911) is opened in the middle of the cladding nozzle (94). The laser generated by the laser (1) enters the cavity (911) through the optical lens group (92) and is emitted from the outlet of the cladding nozzle (94). The cladding nozzle (94) is also provided with an air inlet channel (91) and a powder feeding channel (93). One end of the air inlet channel (91) is connected to the air supply device (2), and the other end of the air inlet channel (91) is connected to the cavity (911). The powder feeding channel (93) is connected to the powder feeder (12).

3. The underwater ultrasonic shock combined with laser powder delivery additive repair device as described in claim 2, characterized in that, The cladding head drainage cover includes an outer drainage cover and an inner drainage cover. The inner drainage cover surrounds the outside of the cladding nozzle (94), and the outer drainage cover surrounds the outside of the inner drainage cover. The inner drainage cover includes an air inlet (95), a gas diffusion chamber (96), a metal foam layer (97), a rectifier chamber (98), and an air outlet lower chamber (99) arranged sequentially from top to bottom. The air inlet (95) is connected to the air supply device (2). The outer drainage cover has a first drainage chamber (910) and is also connected to the air supply device (2).

4. The underwater ultrasonic shock combined with laser powder delivery additive repair device as described in claim 2, characterized in that, The optical lens assembly (92) includes a collimation protection lens, a collimation lens, a focusing lens, and a focusing protection lens arranged layer by layer from top to bottom.

5. The underwater ultrasonic shock combined with laser powder delivery additive repair device as described in claim 3, characterized in that, The diameter of the gas diffusion cavity (96) is larger than the diameter of the air inlet (95). The metal foam layer (97) is filled with a porous metal material with a porosity greater than 90% and is made of one of aluminum, nickel, or copper. The rectifier cavity (98) is provided with a honeycomb cavity.

6. The underwater ultrasonic shock combined with laser powder delivery additive repair device as described in claim 3, characterized in that, The axis of the air inlet (95) is at an angle of 20-40° to the axis of the cladding nozzle (94), and the axis of the outlet of the lower air chamber (99) is parallel to the axis of the cladding nozzle (94); the axis of the bottom outlet of the first drain chamber (910) is at an angle of 0-30° to the cladding nozzle (94), and the upper part of the first drain chamber (910) is at an angle of 60-90° to the axis of the cladding nozzle (94).

7. The underwater ultrasonic shock combined with laser powder delivery additive repair device as described in claim 1, characterized in that, The underwater ultrasonic impact head (7) includes a shell (71), an ultrasonic transducer (72), an impact needle (73), and an impact head drainage cover (74). The ultrasonic transducer (72) is disposed inside the shell (71), and the impact head drainage cover (74) is disposed around the bottom outer side of the shell (71). The impact needle (73) is installed at the bottom of the ultrasonic transducer (72). The bottom of the shell (71) is provided with an opening for the impact needle (73) to extend out. The ultrasonic transducer (72) is connected to the ultrasonic generator (3). The impact head drainage cover (74) is provided with a second drainage chamber, and the second drainage chamber is connected to the air supply device (2).

8. A repair method using the underwater ultrasonic shock combined with laser powder delivery additive repair device according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Turn on the gas supply device (2) to deliver inert gas to the underwater laser cladding head (9), and turn on the first moving device (11) to drive the underwater laser cladding head (9) to the area to be repaired; Step 2: Turn on the laser (1) and powder feeder (12). The first moving device (11) drives the underwater laser cladding head (9) to perform single-layer repair on the area to be repaired. After the repair is completed, turn off the laser (1) and powder feeder (12) and the underwater laser cladding head (9) leaves the repair area. Step 3: Turn on the gas supply device (2) to deliver inert gas to the underwater ultrasonic impact head (7), and turn on the second moving device (5) to drive the underwater ultrasonic impact head (7) to the area to be repaired. Step 4: Turn on the ultrasonic generator (3), and the second moving device (5) drives the underwater ultrasonic impact head (7) to perform ultrasonic impact on the repair layer after step 2. After the impact is completed, the underwater ultrasonic impact head (7) leaves the repair area. Step 5: Repeat steps 1 to 4 a preset number of times until the area to be repaired is repaired. The underwater laser cladding head (9) and the underwater ultrasonic impact head (7) leave the repair area.

9. The repair method as described in claim 8, characterized in that, The laser (1) has a laser power of 1600-2600W and a scanning speed of 10-15 mm / s; the powder feeder (12) has a powder feeding rate of 0.6-1.5 g / min; the gas supply device (2) delivers a protective gas flow rate of 10-30 L / min, a powder-carrying gas flow rate of 5-15 L / min, an inner drainage cover gas flow rate of 30-70 L / min, and an outer drainage cover flow rate of 30-70 L / min to the underwater laser cladding head (9).

10. The repair method as described in claim 8, characterized in that, Underwater ultrasonic impact head (7) Ultrasonic power 600~1000W, single layer impact times 1~3 times.

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