Porous structure atmosphere protection device for titanium alloy laser cladding

Abstract

The utility model relates to the technical field of laser cladding, in particular to a porous structure atmosphere protection device for titanium alloy laser cladding, which comprises a first shell, a second shell and a third shell, the first shell is configured to be cylindrical and used for surrounding a powder path and a light path structure, and the first shell comprises an upper half part and a lower half part; the inner diameter of the lower half part of the first shell is gradually reduced, the lower half part of the first shell is provided with an arc-shaped inner surface, and a first air inlet is formed in the first end of the inner surface. According to the atmosphere protection device, a large-range local protection atmosphere can be formed, the argon filling cost of the laser cladding titanium alloy closed box body is saved, the gas washing time of the atmosphere box is saved, the production and processing efficiency is improved, the device is provided with a cooling loop, the influence of high temperature on a laser head can be effectively avoided, and the production efficiency is improved. According to the device, a molten pool is protected, and meanwhile, a cladded area can be protected.

Description

Technical Field

[0001] The utility model relates to the technical field of laser cladding, in particular to a porous structure atmosphere protection device for laser cladding of titanium alloy. Background Art

[0002] Titanium alloy has high specific strength, low density, good corrosion resistance, and still has good mechanical properties at high temperatures. Therefore, it is widely used in the fields of aerospace, medical treatment, metallurgy, etc. However, traditional processing methods such as forging, casting, and rolling cannot form complex parts, and the material utilization rate is not high. Traditional processing methods are difficult to meet the requirements of aviation blade forming, impeller forming, part repair, etc. Applying laser cladding technology can greatly improve the material utilization rate and the formed structure is not restricted.

[0003] However, titanium alloy is chemically active at high temperatures. It absorbs hydrogen at 250°C, oxygen at 400°C, and nitrogen at 600°C. When laser cladding titanium alloy in an open environment, it is extremely easy to react with gas elements in the air, seriously affecting the mechanical properties and microstructure of titanium alloy. When the concentration of oxygen content in the surrounding is below 20 ppm, the formed sample is silver-white, indicating little oxidation; when the oxygen content increases to 60 ppm, the surface shows white and a small amount of yellow; when the oxygen content is 1000 ppm, a thick oxide film is formed on the surface, showing blue-violet and dark green, indicating a harsh oxidation environment. In an air environment, the oxygen content is as high as 21%, and titanium alloy cannot be formed. A large amount of oxides are easily generated during forming. Since the thermal expansion coefficients of the oxides and titanium alloy itself are different, a large number of cracks will be generated in the titanium alloy during forming, and even forming cannot be achieved.

[0004] Therefore, atmosphere protection is required during the forming process of titanium alloy. Currently, most of them use a closed atmosphere box to fill with inert gas to form a local inert environment. However, when using an atmosphere box, for the forming and repair of large parts, they cannot be placed in the atmosphere box; moreover, in a closed box, it is not conducive to the heat dissipation of part forming. Summary of the Utility Model

[0005] Aiming at the technical problems existing in laser cladding in the prior art, the first aspect of the present utility model provides a porous structure atmosphere protection device for laser cladding of titanium alloy, including:

[0006] A housing, configured to be cylindrical, for surrounding the powder path and optical path structures, and a nozzle is provided at the bottom of the housing;

[0007] A second gas path housing, connected to the outside of the nozzle, the second gas path housing is provided with a second air inlet and a plurality of air outlets, and a porous filling structure is provided between the second air inlet and the plurality of air outlets for making the gas entering from the second air inlet flow out evenly from the plurality of air outlets;

[0008] Among them, when surface treating the workpiece to be processed, the powder path flows along the axis of the nozzle towards the workpiece to be processed, and the light spot of the powder path converged outside the powder path is cladded on the surface of the workpiece to be processed to form a molten pool. The area where the molten pool is located is defined as the first area, and the area around the molten pool is defined as the second area. The first protective gas flow entering from the first air inlet flows out from the inner wall of the nozzle and forms a first protective gas area on the surface of the first area. The second protective gas flow entering from the second air inlet flows out through the plurality of air outlets and forms a second protective gas area on the surface of the second area. The air pressure in the first protective gas area is higher than that in the second protective gas area.

[0009] Preferably, the axis of the air outlet is parallel to the axis of the nozzle.

[0010] Preferably, the lower end surface of the second gas path housing is configured to be circular, the air outlet includes a plurality of circular holes of the same size, and the air outlets are circumferentially arrayed around the axis of the nozzle on the lower end surface of the second gas path housing.

[0011] Preferably, the sum of the flow rates of the first protective gas flow and the second protective gas flow is greater than or equal to 24 L / min.

[0012] Preferably, the second gas path housing includes an upper housing and a lower housing. The upper housing is connected to the outer wall of the nozzle, the lower housing is detachably connected to the upper housing, an annular space is formed between the upper housing and the lower housing, the second air inlet is provided on the upper housing, the air outlet is provided on the lower housing, and the porous filling structure is configured as an annular structure and filled in the annular space.

[0013] Preferably, the upper housing includes an annular first plate body and a first sleeve body extending downward from the edge of the first plate body. A plurality of second air inlets are provided on the first plate body at equal intervals. The outer wall of the first sleeve body is provided with an external thread. The lower housing includes an annular second plate body and a second sleeve body extending upward from the edge of the second plate body. A plurality of air outlets are provided on the second plate body. The inner wall of the second sleeve body is provided with an internal thread. The upper housing is threadedly connected to the lower housing. The thickness of the second plate body is greater than that of the first plate body. The porous filling structure includes copper foam.

[0014] Preferably, in the radial direction of the second gas path housing, the second air inlet is closer to the edge position of the second gas path housing.

[0015] Preferably, the lower end surface of the nozzle coincides with the lower end surface of the air outlet. The distance between the lower end surface of the nozzle and the surface of the workpiece to be processed is 15 mm, and the diameter of the lower end surface of the second gas path housing is 55 mm.

[0016] Preferably, the housing includes a first housing and a second housing. The first housing includes an upper half and a lower half. The lower half of the first housing is configured to have a gradually decreasing inner diameter and has an arcuate inner surface. A first air inlet is provided at a first end of the inner surface, and an extending direction of the first air inlet is tangent to the inner surface. A nozzle is provided at a second end of the inner surface, and the nozzle is parallel to the central axis of the first housing. The second housing is assembled to the upper half of the first housing, and an exhaust passage is provided on the second housing.

[0017] Preferably, the first housing is provided with a circulating cooling passage. The cooling passage is located outside the inner surface, and the circulating cooling passage is connected to a water chiller.

[0018] Compared with the prior art, the advantages of the present utility model are as follows:

[0019] The atmosphere protection device proposed in this application includes a first protection air flow passage and a second protection air flow passage. The first protection gas forms a first protection gas region on the surface of the molten pool when flowing through the first protection air flow passage, and the second protection gas forms a second protection gas region in the molten clad region around the molten pool when flowing through the second protection air flow passage. The second protection air flow will not affect the convergence of the powder. In this way, a large-range local protection atmosphere can be formed, saving the argon filling cost of the laser cladding titanium alloy sealed box, saving the gas washing time of the atmosphere box, and improving the production and processing efficiency. The device has a cooling circuit and can effectively avoid the influence of high temperature on the laser head. While protecting the molten pool, the device can also protect the molten clad region. Description of the Drawings

[0020] The drawings are not intended to be drawn to scale. In the drawings, each identical or approximately identical component shown in each figure may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present utility model will be described by way of example and with reference to the drawings, wherein:

[0021] Figure 1 is a schematic structural view of a porous structure atmosphere protection device for titanium alloy laser cladding shown in the present utility model;

[0022] Figure 2 is a schematic cross-sectional structural view of a porous structure atmosphere protection device for titanium alloy laser cladding shown in the present utility model;

[0023] Figure 3 is a schematic structural view of a laser cladding additive manufacturing system shown in the present utility model;

[0024] Figure 4a is the oxygen content distribution cloud map of the side section of the conical protection device in the prior art;

[0025] Figure 4 b is the oxygen content distribution cloud map of the working plane of the conical protection device in the prior art;

[0026] Figure 5 a is the oxygen content distribution cloud map of the side section of the atmosphere protection device shown in the present application;

[0027] Figure 5 b is the oxygen content distribution cloud map of the working plane of the atmosphere protection device shown in the present application. Detailed implementation manners

[0028] In order to better understand the technical content of the present utility model, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.

[0029] Since titanium alloy is chemically active at high temperatures, the laser cladding of titanium alloy must be carried out under the protective atmosphere of inert gas. Currently, the commonly used atmosphere protection box has the defects of long gas charging and discharging time and large gas consumption. Therefore, it is more flexible and effective to form local atmosphere protection during laser cladding. It should be understood that in addition to forming atmosphere protection for the molten pool, it is also necessary to form atmosphere protection for the clad area around the molten pool until the temperature of the clad area drops below the temperature at which oxidation is not likely to occur, so that even if this part is exposed to air, it will not oxidize.

[0030] Therefore, the present application aims to propose an atmosphere protection device that can form local atmosphere protection for the molten pool and the clad area around the molten pool during laser cladding, especially to overcome the problem that titanium alloy forming must be carried out in a closed atmosphere box; the problem that large parts cannot be installed in the atmosphere box during repair; and the problem that the atmosphere box needs to be purged before cladding, resulting in low production efficiency due to long preparation work.

[0031] As Figure 1 shown, a first aspect of the present utility model proposes a porous structure atmosphere protection device for laser cladding of titanium alloy, including a first housing 11, a second housing 12 and a second gas path housing 20.

[0032] Both the first housing 11 and the second housing 12 are configured as cylindrical. When the first housing 11 and the second housing 12 are connected together, a structure is formed that can surround the internal powder feeding component, and at the same time, a protective gas flow channel for the molten pool is constructed. The second gas path housing 20 is intended to form a protective gas flow channel for the clad area around the molten pool. By controlling the flow rates of the two parts of the protective gas flow, a local atmosphere protection area can be formed in the molten pool and the clad area around the molten pool.

[0033] As Figure 2As shown, the first shell 11 is constructed in a cylindrical shape and is used to surround the powder path and optical path structure. The first shell 11 includes an upper half and a lower half. The lower half of the first shell 11 is constructed with a gradually decreasing inner diameter and has an arc-shaped inner surface 11a. A first air inlet 111 is provided at a first end of the inner surface 11a. The extension direction of the first air inlet 111 is tangent to the inner surface 11a. A nozzle 11b is provided at the second end of the inner surface 11a, and the nozzle 11b is parallel to the central axis of the first shell 11.

[0034] In this way, when an external gas source intervenes into the first air inlet 111, the airflow can enter along the tangent of the inner surface 11a, and flow toward the nozzle 11b along the surface of the inner surface 11a, forming a protective gas around the powder path. Since it flows along the inner surface 11a and the inner wall of the nozzle 11b, it will not interfere with the convergence of the powder, and can especially blow on the surface of the molten pool, forming an atmosphere protection for the molten pool.

[0035] Furthermore, the second shell 12 is assembled to the upper part of the first shell 11, and an exhaust channel is provided on the second shell 12. Since there is a large amount of air in the cavity of the laser optical path before cladding, in order to avoid the adverse effects of this part of air on cladding, an exhaust channel is designed to exhaust the air in the cavity. At the same time, when the air pressure or flow rate in the cavity changes, the exhaust channel can balance the air pressure, make the airflow more stable, and form a more stable local protective atmosphere.

[0036] Furthermore, the second gas circuit housing 20 is intended to provide an air flow channel for the clad area. The second gas circuit housing 20 is connected to the outside of the nozzle 11b. The second gas circuit housing 20 is provided with a second air inlet 211 and multiple air outlets 221. A porous filling structure 23 is provided between the second air inlet 211 and the multiple air outlets 221.

[0037] In this way, when the air flow enters the second air path housing 20 from the second air inlet 211, the gas entering the second air inlet 211 is diverted by the porous filling structure 23, so that the gas flowing out from the second air inlet 211 flows out evenly from the multiple air outlets 221. The multiple air outlets 221 correspond to different positions of the clad area respectively. By delivering protective air flow at different positions, local atmosphere protection is formed on the whole clad area, so that the surface will not be oxidized during the process of solidification and cooling from the molten pool to low temperature.

[0038] When performing surface treatment on a workpiece to be processed, the powder path flows along the axis of the nozzle 11b towards the workpiece to be processed, and the light spot outside the powder path converges to the powder path and is cladded on the surface of the workpiece to be processed to form a molten pool. The area where the molten pool is located is defined as the first area, and the area around the molten pool is defined as the second area. The first protective gas entering from the first air inlet 111 flows out from the inner wall of the nozzle 11b through the inner surface 11a and forms a first protective gas area on the surface of the first area. The second protective gas entering from the second air inlet 211 flows out through a plurality of air outlets 221 and forms a second protective gas area on the surface of the second area. The air pressure in the first protective gas area is higher than that in the second protective gas area.

[0039] In this way, the first protective gas forms an inert atmosphere protection on the surface of the molten pool, and the second protective gas forms an inert atmosphere protection in the area around the molten pool. After the first protective gas reaches the molten pool, it flows towards the area around the molten pool, keeping the surface around the molten pool always covered by the inert gas, and oxygen cannot invade the surface of the second protective gas area. Therefore, the first area and the second area are completely covered by the inert gas, forming a local atmosphere protection.

[0040] Preferably, the axis of the air outlet 221 is parallel to the axis of the nozzle 11b. In this way, the protective gas flowing out from the air outlet 221 will not flow towards the first area, keeping the flow of the powder stable and convergent during transportation, and making the structure formed by cladding uniform.

[0041] In an alternative embodiment, the lower end surface of the second gas path housing 20 is configured to be circular, the air outlet 221 includes a plurality of round holes of the same size, and the air outlets 221 are arranged in a circumferential array around the axis of the nozzle 11b on the lower end surface of the second gas path housing 20.

[0042] In this way, a stable air flow field can be formed around the molten pool. The first protective gas flowing out from the nozzle 11b flows towards the area around the molten pool on the surface of the molten pool, but only the flow rate of the first protective gas cannot meet the atmosphere protection effect for the second area. Therefore, the second protective gas flowing out from the plurality of air outlets 221 and the first protective gas together form a second protective gas area on the surface of the second area. By arranging the plurality of air outlets 221 in a circumferential array, it can be ensured that the second protective gas area is in a stable state.

[0043] Combined Figure 2 As shown, the second gas path housing 20 includes an upper housing 21 and a lower housing 22. The upper housing 21 is connected to the outer wall of the nozzle 11b, the lower housing 22 is detachably connected to the upper housing 21, an annular space is formed between the upper housing 21 and the lower housing 22, a second air inlet 211 is provided on the upper housing 21, air outlets 221 are provided on the lower housing 22, and the porous filling structure 23 is configured as an annular structure and filled in the annular space.

[0044] Thus, when an inert gas source is connected to the second air inlet 211, the inert gas flow enters the annular space from the second air inlet 211. After being split by the porous filling structure, it uniformly flows in the annular space and finally uniformly flows out from the multiple air outlets 221 in a direction parallel to the powder flow. Together with the first protective gas flow flowing towards the outside of the molten pool, it flows from the surface of the second region to the outside of the second region, forming a second protective gas region below the lower housing 22.

[0045] Specifically, the upper housing 21 includes an annular first plate body and a first sleeve body extending downward from the edge of the first plate body. A plurality of second air inlets 211 are provided on the first plate body at equal intervals. The outer wall of the first sleeve body is provided with an external thread. The lower housing 22 includes an annular second plate body and a second sleeve body extending upward from the edge of the second plate body. A plurality of air outlets 221 are provided on the second plate body. The inner wall of the second sleeve body is provided with an internal thread. The upper housing 21 is threadedly connected to the lower housing 22. The thickness of the second plate body is greater than that of the first plate body. The porous filling structure 23 includes copper foam.

[0046] Thus, by rotating the lower housing 22, the disassembly and installation of the lower housing 22 and the upper housing 21 can be completed, and it is thus easy to maintain and replace the internal copper foam structure.

[0047] Since the first protective gas flow gradually flows outward from the molten pool and the gas flow rate in the region far from the molten pool gradually decreases, therefore, preferably, in the radial direction of the second gas path housing 20, the second air inlet 211 is closer to the edge position of the second gas path housing 20.

[0048] Thus, below the second gas path housing 20, the gas flow rate of the second protective gas flow is slightly greater on the outer periphery of the second gas path housing 20 than on the inner side, and the lower part of the second gas path housing 20 is generally filled with inert gas, so that the already clad region will not be oxidized.

[0049] Furthermore, due to the serious heat accumulation phenomenon during the cladding process, therefore, a circulating cooling channel 112 is provided in the first housing 11. The cooling channel is located outside the inner surface 11a, and the circulating cooling channel 112 is connected to a water chiller.

[0050] Thus, through the design of the water cooling structure, the high temperature maintained by the atmosphere protection device for a long time is avoided, so as to improve the processing stability of the laser head.

[0051] In a preferred embodiment, the lower end surface of the nozzle 11b coincides with the lower end surface of the air outlet 221. The distance between the lower end surface of the nozzle 11b and the surface of the workpiece to be processed is 15 mm. The diameter of the lower end surface of the second gas path housing 20 is 55 mm. The sum of the flow rates of the first protective gas flow and the second protective gas flow is greater than or equal to 24 L / min.

[0052] Combined with Figure 5As shown in Figs. 5a and 5b, from the obtained oxygen content distribution nephograms of the side section and the working plane, it can be seen that in the molten pool surface and the surrounding area of the molten pool, especially on the workpiece surface corresponding to the lower part of the second gas path housing 20, a good low oxygen content area is formed.

[0053] Under the same protective gas flow rate, by comparing with the conical atmosphere protection device in the prior art, it can be known that the oxygen content of the atmosphere protection device proposed in this application in the working plane and the side section of the porous atmosphere protection device is significantly lower than that of the conical atmosphere protection device (as Figure 4 shown in Figs. 4a and 4b), which is more conducive to the forming of titanium alloy.

[0054] As Figure 3 shown, the second aspect of the present utility model proposes a technical solution, a laser cladding additive manufacturing system, including:

[0055] A laser, for emitting a laser beam;

[0056] A powder feeding component; including a connecting shaft 41, a pressure relief cavity 42 and a quartz powder tube 44. The first end of the connecting shaft 41 is connected to the powder delivery tube, the second end is connected to the first end of the pressure relief cavity 42, the second end of the pressure relief cavity 42 is connected to the quartz powder tube 44, and an air sleeve 43 is arranged outside the quartz powder tube 44;

[0057] An optical path structure, including a conical lens 31 and an annular lens 32. The laser beam is split and reflected by the conical lens 31 to the annular lens 32, and the annular lens 32 forms intersecting laser beams, forming a light spot below the quartz powder tube 43. When the powder passes through the light spot, it is laser cladded on the workpiece surface to form a molten pool;

[0058] The above-mentioned porous structure atmosphere protection device for titanium alloy laser cladding;

[0059] Wherein, a collimated air flow channel is formed between the air sleeve 43 and the quartz powder tube 44, a molten pool protection flow channel is formed between the air sleeve 43 and the inner surface 11a, and the outlets of a plurality of second air inlets 211 form a protected flow channel for the cladded area. The collimated air flow channel and the molten pool protection flow channel correspond to the first area, and the protected flow channel for the cladded area corresponds to the second area.

[0060] In this way, the collimated air flow channel and the molten pool protection flow channel respectively protect the powder and the molten pool, and the outlets of a plurality of second air inlets 211 form a protected flow channel for the cladded area to protect the second area, so that an inert air flow passes through the surfaces of the first area and the second area. On the one hand, it can improve the cooling rate of the cladded area, shortening its oxidation window. On the other hand, it provides atmosphere protection within its oxidation window. Therefore, the quality of the formed structure by cladding is better and there is no oxide layer on the surface.

[0061] Therefore, the atmosphere protection device proposed in this application can realize the titanium alloy laser cladding forming process in an open environment.

[0062] Although the present utility model has been disclosed above in its preferred embodiments, it is not intended to limit the present utility model. Those of ordinary skill in the technical field to which the present utility model pertains can make various modifications and refinements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to what is defined by the claims.

Claims

1. A porous structure atmosphere protection device for titanium alloy laser cladding, characterized in that: include: The shell is constructed in a cylindrical shape and is used to surround the powder path and the optical path structure, and a nozzle (11b) is provided at the bottom of the shell; The shell comprises a first shell (11) and a second shell (12), the first shell (11) comprising an upper half and a lower half, the lower half of the first shell (11) being configured to have a gradually decreasing inner diameter and having an arc-shaped inner surface (11a), a first air inlet (111) being provided at a first end of the inner surface (11a); A second gas circuit housing (20) connected to the outside of the nozzle (11b), the second gas circuit housing (20) being provided with a second gas inlet (211) and a plurality of gas outlets (221), a porous filling structure (23) being provided between the second gas inlet (211) and the plurality of gas outlets (221) for allowing the gas entering through the second gas inlet (211) to flow out uniformly from the plurality of gas outlets (221); When the workpiece to be processed is subjected to surface treatment, the powder path flows toward the workpiece to be processed along the axis of the nozzle (11b), and is melted onto the surface of the workpiece to be processed by the light spot gathered from the outside of the powder path to form a molten pool. The area where the molten pool is located is defined as the first area, and the area around the molten pool is defined as the second area. The first protective gas flow entering through the first air inlet (111) flows out from the inner wall of the nozzle (11b) to form a first protective gas area on the surface of the first area. The second protective gas flow entering through the second air inlet (211) flows out through the plurality of air outlets (221) to form a second protective gas area on the surface of the second area. The air pressure in the first protective gas area is higher than the air pressure in the second protective gas area.

2. The porous structure atmosphere protection device for titanium alloy laser cladding according to claim 1 is characterized in that: The axis of the air outlet (221) is parallel to the axis of the nozzle (11b).

3. The porous structure atmosphere protection device for titanium alloy laser cladding according to claim 1 is characterized in that: The lower end surface of the second gas circuit housing (20) is constructed in a circular shape, the gas outlet (221) comprises a plurality of circular holes of the same size, and the gas outlets (221) are distributed in a circular array around the axis of the nozzle (11b) on the lower end surface of the second gas circuit housing (20).

4. The porous structure atmosphere protection device for titanium alloy laser cladding according to claim 1 is characterized in that: The sum of the flow rates of the first protective airflow and the second protective airflow is greater than or equal to 24 L / min.

5. The porous structure atmosphere protection device for titanium alloy laser cladding according to claim 1 is characterized in that: The second gas path housing (20) comprises an upper housing (21) and a lower housing (22), wherein the upper housing (21) is connected to the outer wall of the nozzle (11b), and the lower housing (22) is detachably connected to the upper housing (21), and an annular space is formed between the upper housing (21) and the lower housing (22), wherein the upper housing (21) is provided with the second air inlet (211), and the lower housing (22) is provided with the air outlet (221), and the porous filling structure (23) is constructed as an annular structure and is filled in the annular space.

6. The porous structure atmosphere protection device for titanium alloy laser cladding according to claim 5 is characterized in that: The upper shell (21) comprises an annular first plate body and a first sleeve body extending downward from the edge of the first plate body, the first plate body is provided with a plurality of second air inlets (211) at equal intervals, the outer wall of the first sleeve body is provided with external threads, the lower shell (22) comprises an annular second plate body and a second sleeve body extending upward from the edge of the second plate body, the second plate body is provided with a plurality of air outlets (221), the inner wall of the second sleeve body is provided with internal threads, the upper shell (21) is threadedly connected to the lower shell (22), the thickness of the second plate body is greater than the thickness of the first plate body, and the porous filling structure (23) comprises foam copper.

7. The porous structure atmosphere protection device for titanium alloy laser cladding according to claim 6 is characterized in that: In the radial direction of the second gas circuit housing (20), the second air inlet (211) is closer to the edge of the second gas circuit housing (20).

8. The porous structure atmosphere protection device for titanium alloy laser cladding according to any one of claims 1 to 7, characterized in that: The lower end surface of the nozzle (11b) coincides with the lower end surface of the gas outlet (221), the distance between the lower end surface of the nozzle (11b) and the surface of the workpiece to be processed is 15 mm, and the diameter of the lower end surface of the second gas path housing (20) is 55 mm.

9. The porous structure atmosphere protection device for titanium alloy laser cladding according to claim 1, characterized in that: The extension direction of the first air inlet (111) is tangent to the inner surface (11a); a nozzle (11b) is provided at the second end of the inner surface (11a); the nozzle (11b) is parallel to the central axis of the first shell (11); the second shell (12) is assembled to the upper half of the first shell (11); an exhaust channel is provided on the second shell (12).

10. The porous structure atmosphere protection device for titanium alloy laser cladding according to claim 9, characterized in that: The first shell (11) is provided with a circulating cooling channel (112), the cooling channel is located outside the inner surface (11a), and the circulating cooling channel (112) is connected to a water cooler.

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