A laser welding device for titanium alloy and its welding method

Abstract

The present invention provides a laser welding device for titanium alloy and a welding method thereof, which relates to the technical field of welding. The present invention includes a welding table, a positioning fixture, and a welding mechanism; the welding mechanism includes a frame, a laser welding component, a first air jet component, a second air jet component, and a third air jet component; the frame is arranged on the welding table, and the laser welding component is slidably arranged on the frame and located above the welding table; a plurality of first air jet components are arranged on the frame along the moving path of the laser welding component, and the plurality of first air jet components are used for continuously jetting a protective gas onto the surface of the weld seam. The second air jet component is installed in the welding table and is used for jetting a protective gas onto the back surface of the titanium alloy plate located at the weld seam; the third air jet component is arranged on the laser welding component and is used for jetting a protective gas onto the laser emitting end of the laser welding component. Compared with the prior art, the present invention has the advantage of improving the quality defects of the welded titanium alloy.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and particularly relates to a laser welding device for titanium alloy and a welding method thereof. Background Art

[0002] Due to its characteristics such as light weight, high strength, corrosion resistance, and high temperature resistance, titanium alloy is increasingly widely used in the field of automobile manufacturing, mainly for the following components: Exhaust system, titanium alloy has excellent high temperature resistance and corrosion resistance, and is suitable for manufacturing automobile exhaust pipes, mufflers and other parts, which can reduce weight and improve durability. Engine components, titanium alloy is used to manufacture high stress components such as engine valves, connecting rods and pistons, which can improve durability and reduce mass, thereby enhancing the performance and fuel efficiency of the engine. Suspension system, titanium alloy is used for components such as suspension springs and steering linkages, which can reduce the weight of the whole vehicle and improve handling and riding comfort. Wheels, some high-performance or racing cars use titanium alloy wheels, which can significantly reduce the unsprung mass and improve the dynamic performance of the vehicle. Fasteners, due to its advantages of high strength and light weight, titanium alloy is commonly used to manufacture bolts, nuts and other fasteners for the body and power system. Braking system, titanium alloy can be used for components such as brake discs and calipers, which can reduce weight while maintaining high strength and good thermal stability. Through the application in these components, titanium alloy helps automobiles achieve the goal of lightweight, thereby improving fuel efficiency and performance.

[0003] In the related art, due to the unique material properties of titanium alloy, the welding of titanium alloy is often achieved by laser welding. However, in practice, the applicant found that there are quality defects in the welded titanium alloy. Summary of the Invention

[0004] In order to solve the problem of quality defects in the welded titanium alloy, the present application provides a laser welding device for titanium alloy and a welding method thereof.

[0005] In the first aspect, the present application provides a laser welding device for titanium alloy, adopting the following technical scheme:

[0006] A laser welding device for titanium alloy, comprising a welding table for placing titanium alloy plates to be welded; a plurality of positioning fixtures are provided on the welding table for limiting the position of the titanium alloy plates on the welding table; a welding mechanism, the welding mechanism comprising a frame, a laser welding assembly, a first jet assembly, a second jet assembly and a third jet assembly; wherein the frame is provided on the welding table, and the laser welding assembly is slidably provided on the frame and is located above the welding table, and the laser welding assembly slides along the frame to weld the titanium alloy plates; the frame comprises a rodless electric cylinder, a hydraulic cylinder and a strip cover, the rodless electric cylinder is provided with a group on each side of the welding table, and the two groups of the rodless electric cylinders operate synchronously, and the hydraulic cylinder It is arranged on the moving piston of the rodless electric cylinder, and the piston rod of the hydraulic cylinder extends vertically upward, the strip cover is horizontally arranged on the top of the two hydraulic cylinders, and the laser welding assembly is slidably arranged on the strip cover; the first jet assembly is provided with multiple on the frame along the moving path of the laser welding assembly, and the multiple first jet assemblies are used to continuously spray protective gas to the weld surface. When the laser welding assembly moves along the frame, the first jet assembly adjacent to the laser welding assembly automatically avoids the laser welding assembly and resets to the moving path of the laser welding assembly after the laser welding assembly moves away; the laser welding assembly includes a moving seat, a laser welding head and a threaded sleeve , the threaded sleeve and the laser welding head are both arranged on a movable seat, a threaded rod is arranged along the top of the strip cover, a rotating motor is arranged near the end of the strip cover, the output shaft of the rotating motor is coaxially connected with the threaded rod, and the threaded sleeve is threadedly sleeved on the threaded rod; movable strip grooves are opened in parallel on the upper and lower walls of the strip cover along the strip cover, and the laser welding head extends vertically downward to the side close to the welding table after passing through the two movable strip grooves; an arc plate is arranged in the strip cover along the length direction of the strip cover, and a first air film sleeve is bonded in the arc plate along the length direction of the arc plate, the first air film sleeve is connected to the gas source, and when the first air film sleeve is filled with protective gas, the first The cross-sectional shape of an air film sleeve gradually expands to a circle when the protective gas is filled; the first jet assembly includes a first jet head, the first jet head is connected to the first air film sleeve through a telescopic hose, and the nozzle end of the first jet head extends vertically downward to near the weld after passing through the moving strip groove; a avoidance portion is provided on the laser welding head in the strip cover, and the avoidance portion is used to drive the adjacent first jet head to automatically avoid the laser welding head when the laser welding head moves along the moving strip groove and approaches the first jet head; the avoidance portion has a first avoidance slope, a smooth transition surface and a second avoidance slope, and the first avoidance slope and the second avoidance slope are symmetrically arranged on both sides of the smooth transition surface;A sliding rail is horizontally provided on the inner bottom wall of the strip-shaped cover. A slider is provided on the outer periphery of the first jet head. The slider is slidably disposed in the sliding rail. Avoidance grooves perpendicular to the moving strip groove are formed on both the upper and lower walls of the sliding rail. The avoidance groove on the bottom wall of the sliding rail communicates with the moving strip groove. An avoidance spring is provided between the inner side wall of the sliding rail and the slider. When the avoidance spring is in a natural state, the first jet head is located on the extension path of the moving strip groove. A spherical block is provided directly above the first jet head. The spherical block is directly opposite to a part of the first avoidance inclined surface in the length direction of the strip-shaped cover. When the laser welding head moves along the moving strip groove and approaches the first jet head, the spherical block slides and abuts against the first avoidance inclined surface and deviates to one side of the moving strip groove under the action of the first avoidance inclined surface. When the laser welding head gradually moves away from the adjacent first jet head along the moving strip groove, the first jet head is reset to the extension path of the moving strip groove under the action of the avoidance spring. The second jet assembly is installed in the welding table and is used to spray a shielding gas onto the back surface of the titanium alloy plate at the weld. The third jet assembly is provided on the laser welding assembly and is used to spray a shielding gas onto the laser emitting end of the laser welding assembly. A water cooling mechanism is installed in the welding table and is close to the back side of the weld of the titanium alloy plate and is used to cool the weld of the titanium alloy plate after welding.;

[0007] Preferably, an extrusion assembly is further provided on the laser welding head. The extrusion assembly is used to extrude the first air film sleeve so that the gas filling space in the first air film sleeve is restricted. And in the length direction of the strip-shaped cover, the restricted part of the gas filling space is synchronized with the position of the laser welding head. The extrusion assembly includes a connecting rod, an abutting column, and a first abutting ball. The connecting rod is provided on the laser welding head and is located inside the strip-shaped cover. The connecting rod extends horizontally, and the length direction of the connecting rod is perpendicular to the length direction of the moving strip groove. The abutting column is vertically installed on the connecting rod. A first arc-shaped rotating groove is formed on the lower end surface of the abutting column. The first abutting ball is rotatably disposed in the first arc-shaped rotating groove. The first abutting ball rolls and abuts against the inside of the arc-shaped plate, and the outer peripheral arc of the first abutting ball is adapted to the inner arc wall of the arc-shaped plate to extrude the first air film sleeve so that the expansion action of the first air film sleeve after filling with the shielding gas is restricted.

[0008] Preferably, an arc-shaped accommodating groove is provided along the length direction of the welding table inside the welding table. A second air film sleeve is adhesively bonded in the arc-shaped accommodating groove along the length direction of the arc-shaped accommodating groove. The second air film sleeve is connected to a gas source. When the second air film sleeve is filled with a protective gas, the cross-sectional shape of the second air film sleeve gradually expands to a circular shape when the protective gas is filled. The second jetting assembly includes a second jetting head. An extension strip groove is provided along the length direction of the welding table inside the welding table. The upper opening of the extension strip groove faces the weld seam, and the lower opening is connected to the arc-shaped accommodating groove. A plurality of second jetting heads are connected in series along the length direction of the second air film sleeve, and the jetting port ends of the second jetting heads are located in the extension strip groove and vertically face upward towards the weld seam of the titanium alloy plate.

[0009] Preferably, an extrusion synchronization assembly is provided on the laser welding head. The extrusion synchronization assembly is used to extrude the second air film sleeve, and the extrusion position is on the same vertical line as the position where the first abutting ball extrudes the first air film sleeve. The extrusion synchronization assembly includes a first cross bar, a sliding vertical bar, a second cross bar, and a second abutting ball. A side groove is opened along the length direction of the side wall of the strip-shaped cover. The first cross bar is coaxially connected to the connecting rod and horizontally passes through the strip-shaped cover through the side groove. A sliding hole is vertically opened at one end of the first cross bar away from the strip-shaped cover. The sliding vertical bar is vertically slidably inserted into the sliding hole. A through strip groove is communicated and opened on one side of the arc-shaped accommodating groove inside the welding table. The second cross bar is horizontally arranged at the bottom of the sliding vertical bar, and the second cross bar horizontally extends to the arc-shaped accommodating groove through the through strip groove. A second arc-shaped rotating groove is opened at the end of the second cross bar away from the sliding vertical bar. The second abutting ball is rotatably arranged in the second arc-shaped rotating groove, and the outer arc of the second abutting ball is adapted to the inner arc wall of the arc-shaped accommodating groove to extrude the second air film sleeve, so that the expansion action of the second air film sleeve after being filled with the protective gas is restricted.

[0010] Preferably, the water cooling mechanism includes a water cooling pipe. Water cooling grooves are symmetrically opened on both sides of the extension strip groove along the length direction of the welding table on the welding table. The water cooling pipe is arranged in the water cooling grooves, and both ends of the water cooling pipe are respectively connected to a water source. The third jetting assembly includes a third jetting head. The third jetting head is connected to one side of the laser welding head through a bracket, and the jetting port end of the third jetting head is close to and faces the laser emitting end of the laser welding head. The third jetting head is communicated with a gas source through a telescopic hose.

[0011] In a second aspect, the present application provides a welding method for titanium alloy, adopting the following technical solution:

[0012] A welding method for titanium alloy is carried out by using the titanium alloy laser welding device described in the above technical solution, including the following steps:

[0013] Place the two titanium alloy plates to be welded on the welding table, and position the two titanium alloy plates through the positioning fixture;

[0014] Adjust the position of the laser welding assembly through the frame so that the moving path of the laser welding assembly is parallel to the joint of the two titanium alloy plates in the vertical direction;

[0015] Start the water cooling mechanism and let the water cooling mechanism perform pre-cooling operation in advance;

[0016] Connect the gas source to the first jet assembly, the second jet assembly and the third jet assembly, and at the same time start the laser welding assembly, so that the laser welding assembly welds the joint and continuously welds along the joint to form a weld seam.

[0017] The present invention has the following advantages and beneficial effects:

[0018] 1. Place the two titanium alloy plates to be welded on the welding table, and make the joint of the two titanium alloy plates to be welded directly below the laser welding assembly, and make the moving path of the laser welding assembly parallel to the joint of the two titanium alloy plates in the vertical direction, and make the laser emitting end of the laser welding assembly. Then limit the positions of the two titanium alloy plates to be welded through the positioning fixture, start the water cooling mechanism in advance, let the water cooling mechanism perform pre-cooling operation in advance, and start the laser welding assembly, the first jet assembly, the second jet assembly and the third jet assembly synchronously. Since there are multiple first jet assemblies arranged on the frame along the moving path of the laser welding assembly, multiple first jet assemblies can introduce protective gas at the joint of the two titanium alloy plates in advance. At the same time, the second jet assembly can introduce protective gas at the back of the joint of the two titanium alloy plates in advance, so that the joint of the two titanium alloy plates is always filled with protective gas. And because the laser emitting end of the laser welding assembly emits laser for welding, the temperature of its laser emitting end is always the highest. Therefore, the third jet assembly always sprays protective gas towards the laser emitting end of the laser welding assembly, so that the laser emitting end of the laser welding assembly and the current weld seam can always be filled with protective gas, thereby greatly reducing the probability of the weld seam being oxidized and improving the quality of the titanium alloy after welding;

[0019] 2. Since multiple first jet heads and the laser welding head are all located within the moving strip groove, the movement of the laser welding head within the moving strip groove will inevitably be restricted by the first jet heads. When the avoidance portion is provided, the laser welding head moves simultaneously with the avoidance portion. The first avoidance inclined surface on the avoidance portion will first come into contact with the spherical block, causing the spherical block to move in the length direction of the sliding rail under the contact of the first avoidance inclined surface, thereby driving the first jet head to shift into the avoidance groove. Exemplarily, in order to improve the contact effect between the first avoidance inclined surface, the smooth transition surface, and the second avoidance inclined surface and the spherical block, a polytetrafluoroethylene layer is coated on the first avoidance inclined surface, the smooth transition surface, and the second avoidance inclined surface, which can reduce the frictional resistance between the spherical block and the first avoidance inclined surface, the smooth transition surface, and the second avoidance inclined surface, making it easier for the spherical block to be pushed and shifted. On this basis, when the spherical block is shifted, the laser welding head moves along the moving strip groove with the avoidance portion. Under the elastic force of the avoidance spring, the spherical block will pass through the smooth transition surface and then gradually reset to the initial state along the second avoidance inclined surface, thereby driving the first jet head to return from the avoidance groove to the moving strip groove. In this case, the movement of the laser welding head within the moving strip groove is not easily interfered by the first jet head, improving the coordination between the two.

[0020] 3. Due to the contact restriction of the first abutting ball, the part of the first air film sleeve that can be filled with the protective gas cannot be filled further from the gas source end to the contact position of the first abutting ball. At the same time, since in the length direction of the strip-shaped cover, the contact position of the first abutting ball is synchronized with the position of the laser welding head, the moving distances of the first abutting ball and the laser welding head in the length direction of the moving strip groove are the same. In this way, within the moving strip groove, no gas will be generated in the first jet head at the place where the laser welding head has not reached yet, because there is no protective gas in the corresponding first air film sleeve at the corresponding position. That is to say, as long as the first air film sleeve corresponding to the first jet head that has avoided the laser welding head can be filled with the protective gas, while the first air film sleeve corresponding to the first jet head that has not avoided the laser welding head cannot be filled with the protective gas under the contact action of the first abutting ball. The purpose of this setting is to greatly save the release of the protective gas, because no weld seam is generated at the place where the laser welding head has not reached yet, so there is no need to fill the protective gas. And the place where the laser welding head has reached indicates that a weld seam has been generated there, and at this time, it is necessary to fill the protective gas, which can greatly save the protective gas and avoid unnecessary waste. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0022] Figure 1 is a schematic structural diagram of an embodiment of the present application;

[0023] Figure 2 is a schematic partial structural diagram of an embodiment of the present application;

[0024] Figure 3 is a schematic partial structural diagram of an embodiment of the present application for showing the internal structure of the strip-shaped cover Figure 1 ;

[0025] Figure 4 is Figure 3 the enlarged view of part A in

[0026] Figure 5 is a schematic partial structural diagram of an embodiment of the present application for showing the internal structure of the strip-shaped cover Figure 2 ;

[0027] Figure 6 is a schematic partial structural diagram of an embodiment of the present application for showing the internal structure of the strip-shaped cover Figure 3 ;

[0028] Figure 7 is a schematic partial structural diagram of an embodiment of the present application for showing the internal structure of the strip-shaped cover Figure 4 ;

[0029] Figure 8 is the structural cross-section of an embodiment of the present application Figure 1 ;

[0030] Figure 9 is the structural cross-section of an embodiment of the present application Figure 2 ;

[0031] Figure 10 is Figure 9 the enlarged view of part B in

[0032] The labels in the figure are:

[0033] 1. Welding table; 11. Arc-shaped accommodating groove; 12. Second air film sleeve; 13. Extension strip groove; 14. Through strip groove; 2. Positioning fixture; 3. Welding mechanism; 4. Machine frame; 41. Rodless electric cylinder; 42. Hydraulic cylinder; 43. Strip-shaped cover; 431. Threaded rod; 432. Rotating motor; 433. Moving strip groove; 434. Arc-shaped plate; 435. First air film sleeve; 436. Sliding rail; 4361. Avoidance groove; 4362. Avoidance spring; 437. Side groove; 5. Laser welding assembly; 51. Moving seat; 52. Laser welding head; 521. Avoidance part; 5211. First avoidance inclined plane; 5212. Smooth transition surface; 5213. Second avoidance inclined plane; 53. Threaded sleeve; 6. First jetting assembly; 61. First jetting head; 611. Slide block; 612. Spherical block; 613. Extrusion assembly; 6131. Connecting rod; 6132. Abutting column; 6133. First abutting ball; 62. Telescopic hose; 63. Extrusion synchronization assembly; 631. First cross bar; 6311. Sliding hole; 632. Sliding vertical rod; 633. Second cross bar; 634. Second abutting ball; 7. Second jetting assembly; 71. Second jetting head; 8. Third jetting assembly; 81. Third jetting head; 9. Water cooling mechanism; 91. Water cooling pipe. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts shall fall within the scope protected by the present invention.

[0035] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0036] In related technologies, due to its excellent properties such as high strength, corrosion resistance and low density, titanium alloy is widely used in fields such as aerospace, medical devices and automobile manufacturing. However, titanium alloy exhibits special physical and chemical characteristics during the welding process, which makes its welding process have relatively high technical requirements.

[0037] Titanium alloys have extremely strong activity at high temperatures and are prone to react with elements such as oxygen, nitrogen, and hydrogen. Especially during the welding process, when the temperature exceeds 400°C, the titanium alloy material will quickly combine with the oxygen in the air to form an oxide layer. This oxide layer will not only increase the brittleness of the welding area, reducing the toughness and strength of the titanium alloy itself, but also significantly affect the density and welding strength of the weld. Therefore, avoiding oxidation during the titanium alloy welding process is the key to ensuring the weld quality.

[0038] In related technologies, laser welding has become a common method for titanium alloy welding due to its high energy density and precision. However, the applicant has found in practice that even during laser welding, there is still a problem that the titanium alloy welds are prone to oxidation, resulting in unqualified quality of the welded titanium alloy. The specific technical problems are mainly manifested in the following two aspects:

[0039] 1. Oxidation problem at the front end of the weld: During laser welding, when the welding head moves in a straight line, although the area affected by the laser beam is covered by the shielding gas, as the welding head moves forward, the previously welded front part of the weld will be exposed to the air. This area is not shielded by the shielding gas in time, and at this time, the titanium alloy is in a high-temperature state and is extremely prone to react with the oxygen in the air, resulting in oxidation at the front end of the weld. This oxide layer not only reduces the mechanical properties of the weld but may also cause embrittlement of the welded joint.

[0040] 2. Oxidation problem at the back of the weld: When laser welding titanium alloys, the welding area above the welding head is usually covered by the shielding gas, but the back part of the weld is often exposed to the air. During the welding process, the heat-affected zone is not limited to the weld surface, and the back area is also affected by high temperatures. Titanium alloys are very sensitive to gases such as oxygen and nitrogen. Even though the back does not directly contact the laser, the temperature at the back will also rise high enough during the welding process to chemically react with the oxygen or nitrogen in the air. Therefore, during the welding process, the back of the titanium alloy is also in a high-temperature state and is extremely prone to oxidation, resulting in a decline in the overall performance of the titanium alloy structure. Especially in application scenarios with high requirements for strength and fatigue life, this oxidation problem will further magnify the impact of welding defects.

[0041] In summary, although the existing laser welding technology has the advantages of high efficiency and precision, due to the high activity of titanium alloys themselves, it is difficult to provide comprehensive and continuous protection for the front end and back of the welds, resulting in oxidation at different parts of the welds, ultimately affecting the welding quality and the service performance of titanium alloy products.

[0042] Based on this, the applicant has proposed a laser welding device and its welding method for titanium alloys.

[0043] Please refer to Figures 1 to 10Some embodiments of the present application provide a laser welding device for titanium alloy, including a welding table 1 for placing a titanium alloy plate to be welded; a positioning fixture 2, a plurality of which are provided on the welding table 1 and are used to limit the titanium alloy plate on the welding table 1; a welding mechanism 3, the welding mechanism 3 including a frame 4, a laser welding assembly 5, a first jet assembly 6, a second jet assembly 7 and a third jet assembly 8; wherein the frame 4 is provided on the welding table 1, and the laser welding assembly 5 is slidably provided on the frame 4 and is located above the welding table 1, and the laser welding assembly 5 is used to weld the titanium alloy plate after sliding along the frame 4; a plurality of first jet assemblies 6 are provided on the frame 4 along the moving path of the laser welding assembly 5, and the plurality of first jet assemblies 6 are used to continuously spray protective gas onto the weld surface, and when the laser welding assembly 5 moves along the frame 4, the first jet assembly 6 adjacent to the laser welding assembly 5 automatically avoids the laser welding assembly 5, and resets to the moving path of the laser welding assembly 5 after the laser welding assembly 5 moves away.

[0044] At the same time, the second jet assembly 7 is installed in the welding table 1, and is used to spray protective gas to the back side of the titanium alloy plate at the weld; the third jet assembly 8 is arranged on the laser welding assembly 5, and is used to spray protective gas to the laser emitting end of the laser welding assembly 5; the water cooling mechanism 9 is installed in the welding table 1 and close to the back side of the weld of the titanium alloy plate, and is used to cool the weld of the titanium alloy plate after welding.

[0045] For example, in the process of laser welding titanium alloy, the commonly used shielding gases include argon, helium, nitrogen and other mixed gases. The main function of these shielding gases is to prevent the welding area from reacting with oxygen, nitrogen and moisture in the air, thereby avoiding oxidation or nitridation on the surface of the titanium alloy and ensuring the high quality and corrosion resistance of the weld. In the present application, the shielding gas selected can be any one of argon, helium or nitrogen.

[0046] On this basis, place the two titanium alloy plates to be welded on the welding table 1, and make the joint seam of the two titanium alloy plates to be welded directly below the laser welding assembly 5. Also, make the moving path of the laser welding assembly 5 parallel to the joint seam of the two titanium alloy plates in the vertical direction, and position the laser emission end of the laser welding assembly 5. Then, limit the positions of the two titanium alloy plates to be welded through the positioning fixture 2. Start the water cooling mechanism 9 in advance to let the water cooling mechanism 9 perform a pre-cooling operation. Synchronously start the laser welding assembly 5, the first air jet assembly 6, the second air jet assembly 7, and the third air jet assembly 8. Since multiple first air jet assemblies 6 are provided on the frame 4 along the moving path of the laser welding assembly 5, multiple first air jet assemblies 6 can introduce a protective gas at the joint seam of the two titanium alloy plates in advance. At the same time, the second air jet assembly 7 can introduce a protective gas at the back of the joint seam of the two titanium alloy plates in advance, so that the joint seam of the two titanium alloy plates is always filled with the protective gas. And because the laser emission end of the laser welding assembly 5 emits laser for welding, the temperature of its laser emission end is always the highest. Therefore, the third air jet assembly 8 always sprays a protective gas towards the laser emission end of the laser welding assembly 5, so that the laser emission end of the laser welding assembly 5 and the current weld seam are always filled with the protective gas, thereby greatly reducing the probability of the weld seam being oxidized and improving the quality of the titanium alloy after welding.

[0047] At the same time, the water cooling mechanism 9 cools the weld seam of the welded titanium alloy plate. Rapid cooling can reduce the temperature of the heat affected zone, reduce the tissue changes in the heat affected zone, and reduce the possibility of grain coarsening and phase transformation. Effective cooling can reduce the stress in the weld seam, reduce the risk of deformation and cracking, thereby improving the overall quality and reliability of the weld seam.

[0048] In some embodiments, as Figure 1 , Figure 2 shown, the frame 4 includes a rodless cylinder 41, a hydraulic cylinder 42, and a strip-shaped cover 43. A set of rodless cylinders 41 is provided on each side of the welding table 1, and the two sets of rodless cylinders 41 operate synchronously. The hydraulic cylinder 42 is arranged on the moving piston of the rodless cylinder 41, and the piston rod of the hydraulic cylinder 42 extends vertically upward. The strip-shaped cover 43 is horizontally arranged on the tops of the two hydraulic cylinders 42. The laser welding assembly 5 is slidably arranged on the strip-shaped cover 43 along the length direction of the strip-shaped cover 43.

[0049] Exemplarily, the length direction of the rodless cylinder 41 is consistent with the width direction of the welding table 1. With such a setting, the position of the laser welding assembly 5 in the horizontal and vertical directions can be adjusted through the rodless cylinder 41 and the hydraulic cylinder 42, thereby enabling the laser welding assembly 5 to adapt to titanium alloy plates of different thicknesses and improving the welding applicability. At the same time, the laser welding assembly 5 can be made closer to the part to be welded, improving the welding quality.

[0050] In some embodiments, with reference to Figure 1 and Figure 2 , the laser welding assembly 5 includes a moving seat 51, a laser welding head 52, and a threaded sleeve 53. The threaded sleeve 53 and the laser welding head 52 are both disposed on the moving seat 51. A threaded rod 431 is provided along the top of the strip-shaped cover 43. A rotating motor 432 is provided near the end of the strip-shaped cover 43. The output shaft of the rotating motor 432 is coaxially connected to the threaded rod 431. The threaded sleeve 53 is threadedly sleeved on the threaded rod 431. Two parallel moving strip grooves 433 are formed in the upper and lower walls of the strip-shaped cover 43 along the strip-shaped cover 43. The laser welding head 52 passes through the two moving strip grooves 433 and then extends vertically downward to the side close to the welding table 1.

[0051] Exemplarily, the laser welding head 52 is electrically connected to a power source through a spring wire (not shown in the figure). Starting the power source can make the laser welding head 52 operate. On this basis, after starting the rotating motor 432, the cooperation between the threaded rod 431 and the threaded sleeve 53 can make the moving seat 51 move along the length direction of the moving strip groove 433. At this time, if the joint seam between the two titanium alloy plates and the moving strip groove 433 are parallel in the vertical direction, then the laser welding head 52 can weld along the length direction of the joint seam to form a weld seam, so as to achieve the effect of automatic welding of the titanium alloy plates and improve the welding efficiency. Exemplarily, the rotating motor 432 can adjust the rotation speed according to the on-site requirements, so that the movement of the laser welding head 52 can meet the best welding conditions.

[0052] In some embodiments, as Figures 3 to 7 shown, an arc-shaped plate 434 is provided along the length direction of the strip-shaped cover 43 inside the strip-shaped cover 43. A first air film sleeve 435 is adhesively bonded along the length direction of the arc-shaped plate 434 inside the arc-shaped plate 434. The first air film sleeve 435 is connected to a gas source. When the first air film sleeve 435 is filled with a protective gas, the cross-sectional shape of the first air film sleeve 435 gradually expands to a circular shape when the protective gas is filled. Exemplarily, the radian of the arc-shaped plate 434 is a circular arc, that is, when the arc-shaped plate 434 is extended, the arc-shaped plate 434 can form a circle.

[0053] Meanwhile, the first jetting assembly 6 includes a first jetting head 61. The first jetting head 61 is connected to the first air film sleeve 435 through a telescopic hose 62, and the jetting end of the first jetting head 61 passes through the moving strip groove 433 and then extends vertically downward to the side close to the weld seam. Exemplarily, the gas source is connected to the first jetting assembly 6, the second jetting assembly 7, and the third jetting assembly 8 through an air pump (not shown in the figure) at the same time.

[0054] After setting it like this, after turning on the air pump, the protective gas is input from the gas source into the first air film sleeve 435, and the first air film sleeve 435 will expand, making the first air film sleeve 435 filled with gas. At the same time, the gas in the first air film sleeve 435 will be directly input into the first jet head 61 through the telescopic hose 62, and the first jet head 61 will directly eject the protective gas, thereby achieving the effect of more convenient output of the protective gas.

[0055] Exemplarily, in order to improve the service life of the first air film sleeve 435, the material of the first air film sleeve 435 is any one of polyurethane, neoprene, and polyester fiber-reinforced PVC.

[0056] In some embodiments, as Figures 4 to 7 shown, an avoidance portion 521 is provided in the strip-shaped cover 43 on the laser welding head 52. The avoidance portion 521 is used to drive the adjacent first jet head 61 to automatically avoid the laser welding head 52 when the laser welding head 52 moves along the moving strip groove 433 and approaches the first jet head 61.

[0057] Specifically, the avoidance portion 521 has a first avoidance inclined surface 5211, a smooth transition surface 5212, and a second avoidance inclined surface 5213. The first avoidance inclined surface 5211 and the second avoidance inclined surface 5213 are symmetrically arranged on both sides of the smooth transition surface 5212; a sliding rail 436 is transversely provided on the inner bottom wall of the strip-shaped cover 43, and a slider 611 is provided on the outer periphery of the first jet head 61. The slider 611 is slidably arranged in the sliding rail 436, and avoidance grooves 4361 perpendicular to the moving strip groove 433 are opened on both the upper and lower walls of the sliding rail 436. The avoidance groove 4361 on the bottom wall of the sliding rail 436 is communicated with the moving strip groove 433. An avoidance spring 4362 is provided between the inner side wall of the sliding rail 436 and the slider 611. When the avoidance spring 4362 is in a natural state, the first jet head 61 is located on the extension path of the moving strip groove 433.

[0058] At the same time, a spherical block 612 is provided directly above the first jet head 61. The spherical block 612 is directly opposite to a part of the first avoidance inclined surface 5211 in the length direction of the strip-shaped cover 43. When the laser welding head 52 moves along the moving strip groove 433 and approaches the first jet head 61, the spherical block 612 slides and fits with the first avoidance inclined surface 5211 and deviates to one side of the moving strip groove 433 under the action of the first avoidance inclined surface 5211. When the laser welding head 52 gradually moves away from the adjacent first jet head 61 along the moving strip groove 433, the first jet head 61 is reset to the extension path of the moving strip groove 433 under the action of the avoidance spring 4362.

[0059] With such a setting, since multiple first jet heads 61 and the laser welding head 52 are both within the moving strip groove 433, the movement of the laser welding head 52 within the moving strip groove 433 will necessarily be restricted by the first jet heads 61. However, when the avoidance portion 521 is provided, the laser welding head 52 moves with the avoidance portion 521. The first avoidance inclined surface 5211 on the avoidance portion 521 will first come into contact with the spherical block 612, so that the spherical block 612 moves in the length direction of the sliding rail 436 under the contact of the first avoidance inclined surface 5211, and then drives the first jet head 61 to shift into the avoidance groove 4361. Exemplarily, in order to improve the contact effect between the first avoidance inclined surface 5211, the smooth transition surface 5212 and the second avoidance inclined surface 5213 and the spherical block 612, a polytetrafluoroethylene layer is coated on the first avoidance inclined surface 5211, the smooth transition surface 5212 and the second avoidance inclined surface 5213, which can reduce the frictional resistance between the spherical block 612 and the first avoidance inclined surface 5211, the smooth transition surface 5212 and the second avoidance inclined surface 5213, making it easier to push the spherical block 612 to shift.

[0060] On this basis, when the spherical block 612 shifts, the laser welding head 52 moves along the moving strip groove 433 with the avoidance portion 521. Under the elastic force of the avoidance spring 4362, the spherical block 612 will pass through the smooth transition surface 5212 and then gradually reset to the initial state along the second avoidance inclined surface 5213, and then drive the first jet head 61 to return from the avoidance groove 4361 to the moving strip groove 433. In this case, the movement of the laser welding head 52 within the moving strip groove 433 is not easily interfered by the first jet head 61, improving the coordination between the two.

[0061] In some embodiments, referring to Figures 5 to 7 , an extrusion assembly 613 is further provided on the laser welding head 52. The extrusion assembly 613 is used to extrude the first air film sleeve 435, so that the charging space of the protective gas in the first air film sleeve 435 is restricted, and in the length direction of the strip-shaped cover 43, the restricted portion of the charging space is synchronized with the position of the laser welding head 52. Specifically, the extrusion assembly 613 includes a connecting rod 6131, a butting column 6132 and a first butting ball 6133. The connecting rod 6131 is provided on the laser welding head 52 and is located within the strip-shaped cover 43. The connecting rod 6131 extends horizontally, and the length direction of the connecting rod 6131 is perpendicular to the length direction of the moving strip groove 433.

[0062] Meanwhile, the abutting column 6132 is vertically installed on the connecting rod 6131. A first arc-shaped rotating groove is formed on the lower end surface of the abutting column 6132. A first abutting ball 6133 is rotatably arranged in the first arc-shaped rotating groove. The first abutting ball 6133 rolls and abuts against the inside of the arc-shaped plate 434. The outer arc of the first abutting ball 6133 is adapted to the inner arc wall of the arc-shaped plate 434, so as to squeeze the first air film sleeve 435, restricting the expansion movement of the first air film sleeve 435 after being filled with the protective gas.

[0063] With such a setting, due to the abutting restriction of the first abutting ball 6133, the part of the first air film sleeve 435 that can be filled with the protective gas cannot be further filled from the gas source end to the abutting position of the first abutting ball 6133. At the same time, since in the length direction of the strip-shaped cover 43, the abutting position of the first abutting ball 6133 is synchronized with the position of the laser welding head 52, the moving distances of the first abutting ball 6133 and the laser welding head 52 in the length direction of the moving strip groove 433 are the same. In this way, in the moving strip groove 433, no gas is generated in the first jet head 61 where the laser welding head 52 has not reached, because there is no protective gas in the corresponding first air film sleeve 435. That is to say, as long as the part of the first air film sleeve 435 corresponding to the first jet head 61 that has avoided the laser welding head 52 can be filled with the protective gas, and the part of the first air film sleeve 435 corresponding to the first jet head 61 that has not avoided the laser welding head 52 cannot be filled with the protective gas under the abutting action of the first abutting ball 6133.

[0064] The purpose of such a setting is to greatly save the release of the protective gas, because no weld seam is generated where the laser welding head 52 has not reached, and thus there is no need to fill the protective gas. Where the laser welding head 52 has reached indicates that a weld seam has been generated there, and at this time, it is necessary to fill the protective gas, thereby greatly saving the protective gas and avoiding unnecessary waste.

[0065] In some embodiments, such as Figures 8 to 10As shown in the figure, an arc-shaped accommodating groove 11 is provided along the length direction of the welding table 1 inside the welding table 1. A second air film sleeve 12 is adhesively bonded along the length direction of the arc-shaped accommodating groove 11 inside the arc-shaped accommodating groove 11. The second air film sleeve 12 is connected to a gas source. When the second air film sleeve 12 is filled with a protective gas, the cross-sectional shape of the second air film sleeve 12 gradually expands to a circular shape when the protective gas is filled; the second jetting assembly 7 includes a second jetting head 71. An extension strip groove 13 is provided along the length direction of the welding table 1 inside the welding table 1. The upper opening of the extension strip groove 13 faces the weld seam, and the lower opening is connected to the arc-shaped accommodating groove 11. A plurality of second jetting heads 71 are connected in communication along the length direction of the second air film sleeve 12, and the nozzle end of the second jetting head 71 is located in the extension strip groove 13 and vertically faces the weld seam of the titanium alloy plate upwards. Exemplarily, in order to improve the installation stability of the second jetting head 71, a plurality of second jetting heads 71 are adhesively bonded in the extension strip groove 13, that is, when the second air film sleeve 12 is squeezed by the second abutting ball 634, the position of the second jetting head 71 is not affected.

[0066] With such a setting, there are also a plurality of second jetting heads 71 on the back of the weld seam. Filling the protective gas into the second air film sleeve 12 can fill the protective gas on the back of the weld seam, making the protective gas appear in the area where it should appear, improving the utilization rate of the protective gas, and further reducing the oxidation rate of the weld seam.

[0067] In some embodiments, as Figures 9 to 10 shown, an extrusion synchronization assembly 63 is provided on the laser welding head 52. The extrusion synchronization assembly 63 is used to extrude the second air film sleeve 12, and the extrusion position is on the same vertical line as the position where the first abutting ball 6133 extrudes the first air film sleeve 435. Specifically, the extrusion synchronization assembly 63 includes a first cross bar 631, a sliding vertical bar 632, a second cross bar 633, and a second abutting ball 634. A side groove 437 is opened along the length direction of the side wall of the strip-shaped cover 43. The first cross bar 631 is coaxially connected to the connecting rod 6131 and horizontally passes through the strip-shaped cover 43 through the side groove 437. A sliding hole 6311 is vertically opened at one end of the first cross bar 631 away from the strip-shaped cover 43. The sliding vertical bar 632 is vertically slidably inserted into the sliding hole 6311;

[0068] At the same time, a through strip groove 14 is communicated and opened on one side of the arc-shaped accommodating groove 11 inside the welding table 1. The second cross bar 633 is horizontally arranged at the bottom of the sliding vertical bar 632, and the second cross bar 633 horizontally extends to the arc-shaped accommodating groove 11 through the through strip groove 14; a second arc-shaped rotating groove is opened at the end of the second cross bar 633 away from the sliding vertical bar 632. The second abutting ball 634 is rotatably arranged in the second arc-shaped rotating groove, and the outer peripheral radian of the second abutting ball 634 is adapted to the inner arc wall of the arc-shaped accommodating groove 11 to squeeze the second air film sleeve 12, so that the expansion action of the second air film sleeve 12 after being filled with the protective gas is restricted.

[0069] Exemplarily, the first air nozzle and the second air nozzle are arranged in one-to-one correspondence on a vertical line along the arrangement direction.

[0070] With such an arrangement, when the laser welding head 52 drives the first abutting ball 6133 to move along the length direction of the strip-shaped cover 43, the connection of the first cross bar 631, the sliding vertical bar 632 and the second cross bar 633 can also synchronously drive the second abutting ball 634 to move along the length direction of the second arc-shaped rotating groove, so that the second abutting ball 634 also limits the inflation position of the second air film sleeve 12. That is to say, as long as the part in the first air film sleeve 435 corresponding to the first air nozzle 61 of the laser welding head 52 is bypassed, the corresponding part of the second air film sleeve 12 communicated with the second air nozzle 71 can be filled with the protective gas after being filled with the protective gas. However, the part in the first air film sleeve 435 corresponding to the first air nozzle 61 of the laser welding head 52 that has not been bypassed cannot be filled with the protective gas under the abutting action of the first abutting ball 6133, and the corresponding part of the second air film sleeve 12 communicated with the second air nozzle 71 cannot be filled with the protective gas either, further controlling the discharge of the protective gas and effectively reducing the waste of the protective gas.

[0071] In some embodiments, such as Figure 9 , Figure 10 shown, the water cooling mechanism 9 includes a water cooling pipe 91. Water cooling grooves are symmetrically formed on both sides of the extension strip groove 13 along the length direction of the welding table 1 on the welding table 1, and the water cooling pipe 91 is arranged in the water cooling grooves, and both ends of the water cooling pipe 91 are respectively communicated with a water source (not shown in the figure). Exemplarily, the material of the water cooling pipe 91 is 304 or 316 type stainless steel, so that the water cooling pipe 91 has good high temperature resistance and strength, and at the same time has certain corrosion resistance, and is suitable for high temperature and high pressure environments. When cold water passes through, the heat at the weld can be effectively taken away.

[0072] In some embodiments, such as Figure 5 shown, the third air jet assembly 8 includes a third air nozzle 81. The third air nozzle 81 is connected to one side of the laser welding head 52 through a bracket, and the nozzle end of the third air nozzle 81 is close to and faces the laser emission end of the laser welding head 52. The third air nozzle 81 is communicated with a gas source through a hose, and a protective gas is always ejected from the third air nozzle 81 to the laser emission end of the laser welding head 52. It should be noted that the second air nozzle 71 is also communicated with the gas source through a hose.

[0073] Exemplarily, the connection between the first air nozzle 61 and the first air film sleeve 435 avoids the abutting surface of the first abutting ball 6133, and the connection between the second air nozzle 71 and the second air film sleeve 12 avoids the abutting surface of the second abutting ball 634.

[0074] Please refer to Figures 1 to 10, some embodiments of the present application also disclose a welding method for titanium alloy. Welding is carried out by using the laser welding device for titanium alloy in the above embodiments, and the method includes the following steps:

[0075] Place two titanium alloy plates to be welded on the welding table 1, and position the two titanium alloy plates through the positioning fixture 2;

[0076] Adjust the position of the laser welding assembly 5 through the frame 4 so that the moving path of the laser welding assembly 5 is parallel to the joint of the two titanium alloy plates in the vertical direction;

[0077] Start the water cooling mechanism 9 and let the water cooling mechanism 9 perform a pre-cooling operation in advance;

[0078] Connect the gas source to the first jet assembly 6, the second jet assembly 7, and the third jet assembly 8, and at the same time turn on the laser welding assembly 5, so that the laser welding assembly 5 welds the joint and continuously welds along the joint to form a weld seam.

[0079] As mentioned above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A laser welding device for titanium alloy, characterized in that: include: A welding table (1) for placing titanium alloy plates to be welded; A plurality of positioning fixtures (2) are provided on the welding table (1) and are used to limit the position of the titanium alloy plate on the welding table (1); A welding mechanism (3), the welding mechanism (3) comprising a frame (4), a laser welding assembly (5), a first jet assembly (6), a second jet assembly (7) and a third jet assembly (8); wherein: The frame (4) is arranged on the welding table (1), and the laser welding assembly (5) is slidably arranged on the frame (4) and located above the welding table (1), and the laser welding assembly (5) is used to weld the titanium alloy plate after sliding along the frame (4); the frame (4) comprises a rodless electric cylinder (41), a hydraulic cylinder (42) and a strip cover (43), one group of the rodless electric cylinder (41) is arranged on each side of the welding table (1), and the two groups of the rodless electric cylinders (41) operate synchronously, the hydraulic cylinder (42) is arranged on the movable piston of the rodless electric cylinder (41), and the piston rod of the hydraulic cylinder (42) extends vertically upward, the strip cover (43) is horizontally arranged on the top of the two hydraulic cylinders (42), and the laser welding assembly (5) is slidably arranged on the strip cover (43); A plurality of the first jet assemblies (6) are arranged on the frame (4) along the moving path of the laser welding assembly (5), and the plurality of the first jet assemblies (6) are used to continuously spray protective gas onto the surface of the weld; when the laser welding assembly (5) moves along the frame (4), the first jet assemblies (6) adjacent to the laser welding assembly (5) automatically avoid the laser welding assembly (5) and reposition to the moving path of the laser welding assembly (5) after the laser welding assembly (5) moves away; The optical welding assembly (5) comprises a movable seat (51), a laser welding head (52) and a threaded sleeve (53), wherein the threaded sleeve (53) and the laser welding head (52) are both arranged on the movable seat (51), a threaded rod (431) is arranged along the top of the strip cover (43), a rotating motor (432) is arranged near the end of the strip cover (43), an output shaft of the rotating motor (432) is coaxially connected to the threaded rod (431), and the threaded sleeve (53) is threadedly sleeved. The strip cover (43) is provided on the threaded rod (431); the upper and lower walls of the strip cover (43) are provided with movable strip grooves (433) parallel to the strip cover (43); the laser welding head (52) passes through the two movable strip grooves (433) and then extends vertically downward to the side close to the welding table (1); the strip cover (43) is provided with an arc plate (434) along the length direction of the strip cover (43); the arc plate (434) is bonded with a first air film sleeve (435) along the length direction of the arc plate (434); the first air film sleeve (435) is bonded to ... The film sleeve (435) is connected to the gas source. When the first air film sleeve (435) is filled with protective gas, the cross-sectional shape of the first air film sleeve (435) gradually expands to a circular shape under the condition of the protective gas being filled. The first jet assembly (6) includes a first jet head (61). The first jet head (61) is connected to the first air film sleeve (435) through a telescopic hose (62). The nozzle end of the first jet head (61) passes through the movable strip groove (433) and then extends vertically downward to a position close to the weld. The laser welding head (52) is provided with an avoidance portion (521) located inside the strip cover (43), and the avoidance portion (521) is used to drive the adjacent first nozzle (61) to automatically avoid the laser welding head (52) when the laser welding head (52) moves along the moving strip groove (433) and approaches the first nozzle (61); the avoidance portion (521) has a first avoidance slope (5211), a smooth transition surface (5212) and a second avoidance slope (5213), and the first avoidance slope (5211) and the second avoidance slope ( 5213) are symmetrically arranged on both sides of the smooth transition surface (5212); a sliding rail (436) is horizontally arranged on the inner bottom wall of the strip cover (43); a slider (611) is arranged on the outer periphery of the first nozzle (61); the slider (611) is slidably arranged in the sliding rail (436); and the upper and lower walls of the sliding rail (436) are both provided with avoidance grooves (4361) perpendicular to the moving strip groove (433); the avoidance grooves (4361) located on the bottom wall of the sliding rail (436) are aligned with the moving strip groove (433); 33), an avoidance spring (4362) is provided between the inner side wall of the sliding rail (436) and the slider (611), and when the avoidance spring (4362) is in a natural state, the first nozzle (61) is located on the extension path of the moving strip groove (433); a spherical block (612) is provided directly above the first nozzle (61), and the spherical block (612) and a part of the first avoidance slope (5211) are directly opposite in the length direction of the strip cover (43), and when the laser welding head (52) moves along the moving strip groove ( When the laser welding head (52) moves and approaches the first nozzle (61), the spherical block (612) slides and fits with the first avoidance slope (5211) and deviates to one side of the moving strip groove (433) along the avoidance groove (4361) under the action of the first avoidance slope (5211); when the laser welding head (52) gradually moves away from the adjacent first nozzle (61) along the moving strip groove (433), the first nozzle (61) is reset to the extension path of the moving strip groove (433) under the action of the avoidance spring (4362); The second gas injection assembly (7) is installed in the welding table (1) and is used to spray protective gas to the back side of the titanium alloy plate located at the weld; The third gas injection assembly (8) is arranged on the laser welding assembly (5) and is used to spray protective gas toward the laser emitting end of the laser welding assembly (5); The water cooling mechanism (9) is installed in the welding table (1) and close to the back side of the weld seam of the titanium alloy plate, and is used to cool the weld seam of the titanium alloy plate after welding.

2. A laser welding device for titanium alloy according to claim 1, characterized in that: The laser welding head (52) is also provided with an extrusion component (613), and the extrusion component (613) is used to squeeze the first air film sleeve (435) so that the filling space of the protective gas in the first air film sleeve (435) is limited, and in the length direction of the strip cover (43), the limiting part of the filling space is synchronized with the position of the laser welding head (52); The extrusion assembly (613) comprises a connecting rod (6131), an abutment column (6132) and a first abutment ball (6133); the connecting rod (6131) is provided on the laser welding head (52) and is located in the strip cover (43); the connecting rod (6131) extends horizontally, and the length direction of the connecting rod (6131) is perpendicular to the length direction of the movable strip groove (433); The abutment column (6132) is vertically mounted on the connecting rod (6131), and a first arc-shaped rotation groove is opened on the lower end surface of the abutment column (6132), and the first abutment ball (6133) is rotatably arranged in the first arc-shaped rotation groove. The first abutment ball (6133) rolls and abuts in the arc plate (434), and the outer circumferential curvature of the first abutment ball (6133) is adapted to the inner arc wall of the arc plate (434) to squeeze the first air film sleeve (435) so that the expansion movement of the first air film sleeve (435) after being filled with protective gas is restricted.

3. A laser welding device for titanium alloy according to claim 2, characterized in that: An arc-shaped receiving groove (11) is provided inside the welding table (1) along the length direction of the welding table (1), a second air film sleeve (12) is bonded inside the arc-shaped receiving groove (11) along the length direction of the arc-shaped receiving groove (11), the second air film sleeve (12) is connected to the gas source, and when the second air film sleeve (12) is filled with protective gas, the cross-sectional shape of the second air film sleeve (12) gradually expands to a circular shape under the condition of the protective gas being filled; The second jet assembly (7) comprises a second jet head (71); an extension groove (13) is provided inside the welding platform (1) along the length direction of the welding platform (1); the upper end opening of the extension groove (13) faces the weld, and the lower end opening is connected to the arc-shaped receiving groove (11); a plurality of the second jet heads (71) are connected along the length direction of the second air film sleeve (12); and the nozzle end of the second jet head (71) is located inside the extension groove (13) and vertically upward toward the weld of the titanium alloy plate.

4. A laser welding device for titanium alloy according to claim 3, characterized in that: The laser welding head (52) is provided with an extrusion synchronization component (63), and the extrusion synchronization component (63) is used to extrude the second air film sleeve (12), and the extrusion position is on the same vertical line as the position where the first abutment ball (6133) extrudes the first air film sleeve (435); The extrusion synchronization component (63) comprises a first cross bar (631), a sliding vertical bar (632), a second cross bar (633) and a second abutting ball (634); a side wall of the strip cover (43) is provided with a side groove (437) along the length direction of the strip cover (43); the first cross bar (631) is coaxially connected to the connecting rod (6131) and horizontally passes through the strip cover (43) through the side groove (437); a sliding hole (6311) is vertically provided at one end of the first cross bar (631) away from the strip cover (43); and the sliding vertical bar (632) is vertically slidably inserted into the sliding hole (6311); A through slot (14) is provided in the welding table (1) on one side of the arc-shaped receiving slot (11); the second cross bar (633) is horizontally arranged at the bottom of the sliding vertical bar (632); and the second cross bar (633) extends horizontally through the through slot (14) to the arc-shaped receiving slot (11); A second arc-shaped rotation groove is formed at the end of the second cross bar (633) away from the sliding vertical bar (632), and the second abutment ball (634) is rotatably arranged in the second arc-shaped rotation groove, and the outer circumference curvature of the second abutment ball (634) is matched with the inner arc wall of the arc-shaped receiving groove (11) to squeeze the second air film sleeve (12) so that the expansion movement of the second air film sleeve (12) after being filled with protective gas is restricted.

5. The laser welding device for titanium alloy according to claim 3, characterized in that: The water cooling mechanism (9) comprises a water cooling pipe (91), and water cooling grooves are symmetrically provided on the welding platform (1) on both sides of the extension groove (13) along the length direction of the welding platform (1), and the water cooling pipe (91) is placed in the water cooling groove, and both ends of the water cooling pipe (91) are respectively connected to a water source; The third jet assembly (8) comprises a third jet head (81), the third jet head (81) being connected to one side of the laser welding head (52) via a bracket, and the nozzle end of the third jet head (81) being close to and facing the laser emitting end of the laser welding head (52), and the third jet head (81) being connected to a gas source via a telescopic hose (62).

6. A method for welding titanium alloy, using the titanium alloy laser welding device according to any one of claims 1 to 5 for welding, characterized in that: The following steps are involved: Placing two titanium alloy plates to be welded on a welding table (1), and positioning the two titanium alloy plates using a positioning fixture (2); The position of the laser welding assembly (5) is adjusted by means of a frame (4) so ​​that the moving path of the laser welding assembly (5) is parallel to the joining seam between the two titanium alloy plates in the vertical direction; Starting the water cooling mechanism (9) to allow the water cooling mechanism (9) to perform a pre-cooling operation; The gas source is connected to the first jet assembly (6), the second jet assembly (7) and the third jet assembly (8), and the laser welding assembly (5) is turned on at the same time, so that the laser welding assembly (5) welds the joint seam and continuously welds along the joint seam to form a weld seam.

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