Laser welding device for titanium alloy and welding method thereof

Abstract

The invention provides a laser welding device for titanium alloy and a welding method of the laser welding device, and relates to the technical field of welding. The welding mechanism comprises a rack, a laser welding assembly, a first air injection assembly, a second air injection assembly and a third air injection assembly. The rack is arranged on the welding table, and the laser welding assembly is arranged on the rack in a sliding mode and located above the welding table. The multiple first gas spraying assemblies are arranged on the rack along the moving path of the laser welding assembly and used for continuously spraying protective gas to the surface of a welding seam, and the second gas spraying assembly is installed in the welding table and used for spraying protective gas to the back face, located on the welding seam, of the titanium alloy plate; the third gas spraying assembly is arranged on the laser welding assembly and used for spraying protective gas to the laser emitting end of the laser welding assembly. Compared with the prior art, the method has the advantage of improving the quality defect of the welded titanium alloy.

Description

Technical Field

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

[0002] Titanium alloys are increasingly used in the automotive manufacturing industry due to their light weight, high strength, corrosion resistance, and high temperature resistance. They are mainly used in the following parts: Exhaust system: Titanium alloys have excellent high temperature and corrosion resistance and are suitable for manufacturing automobile exhaust pipes, mufflers and other parts, which can reduce weight and improve durability. Engine parts: Titanium alloys are used to manufacture high-stress parts such as engine valves, connecting rods and pistons, which can improve durability and reduce mass, thereby improving engine performance and fuel efficiency. Suspension system: Titanium alloys are used in suspension springs, steering rods and other parts to reduce vehicle weight, improve handling and ride comfort. Wheels: Some high-performance or racing cars use titanium alloy wheels, which can significantly reduce unsprung mass and improve the dynamic performance of the vehicle. Fasteners: Due to their high strength and lightweight advantages, titanium alloys are often used to manufacture fasteners such as bolts and nuts for the body and power system. Braking system: Titanium alloys can be used in brake discs, calipers and other parts, while reducing weight while maintaining high strength and good thermal stability. Through the application of these parts, titanium alloys help automobiles achieve lightweight goals, 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 the welded titanium alloy has quality defects. Summary of the invention

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

[0005] In a first aspect, the present application provides a laser welding device for titanium alloy, which adopts the following technical solution: 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 arranged on the inner bottom wall of the strip cover, a slider is arranged on the outer periphery of the first nozzle, the slider is slidably arranged in the sliding rail, and the upper and lower walls of the sliding rail are provided with avoidance grooves perpendicular to the moving strip groove, the avoidance groove on the bottom wall of the sliding rail is connected with the moving strip groove, an avoidance spring is arranged between the inner side wall of the sliding rail and the slider, and when the avoidance spring is in a natural state, the first nozzle is located on the extension path of the moving strip groove; a spherical block is arranged directly above the first nozzle, and the spherical block and part of the first avoidance slope are directly opposite to each other in the length direction of the strip cover, and when the laser welding head moves along the moving strip groove and approaches the first nozzle , the spherical block slides and fits with the first avoidance slope and deviates to one side of the moving groove along the avoidance groove under the action of the first avoidance slope. When the laser welding head gradually moves away from the adjacent first jet head along the moving groove, the first jet head is reset to the extension path of the moving groove under the action of the avoidance spring; the second jet assembly is installed in the welding table, and is used to spray protective gas to the back of the titanium alloy plate at the weld; the third jet assembly is arranged on the laser welding assembly, and is used to spray protective gas to the laser emitting end of the laser welding assembly; the water cooling mechanism is installed in the welding table 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. ;

[0006] Preferably, the laser welding head is also provided with an extrusion component, which is used to squeeze the first air film sleeve so that the filling space of the protective gas in the first air film sleeve is limited, and in the length direction of the strip cover, the limited part of the filling space is synchronized with the position of the laser welding head; the extrusion component includes a connecting rod, an abutment column and a first abutment ball, the connecting rod is arranged on the laser welding head and is located in the strip 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 abutment column is vertically installed on the connecting rod, and the lower end face of the abutment column is provided with a first arc-shaped rotation groove, the first abutment ball is rotatably arranged in the first arc-shaped rotation groove, the first abutment ball rolls and abuts in the arc plate, and the outer circumferential curvature of the first abutment ball is adapted to the inner arc wall of the arc plate, so as to squeeze the first air film sleeve so that the expansion movement of the first air film sleeve after being filled with protective gas is limited.

[0007] Preferably, an arc-shaped receiving groove is provided in the welding table along the length direction of the welding table, and a second air film sleeve is bonded in the arc-shaped receiving groove along the length direction of the arc-shaped receiving groove, and the second air film sleeve is connected with a gas source. When the second air film sleeve is filled with protective gas, the cross-sectional shape of the second air film sleeve gradually expands to a circle when the protective gas is filled. The second jet assembly includes a second jet head, and an extension groove is provided in the welding table along the length direction of the welding table, the upper end opening of the extension groove is opposite to the weld, and the lower end opening is connected with the arc-shaped receiving groove, and multiple second jet heads are connected along the length direction of the second air film sleeve, and the nozzle end of the second jet head is located in the extension groove and vertically upward toward the weld of the titanium alloy plate.

[0008] Preferably, the laser welding head is provided with an extrusion synchronization component, which 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 abutment ball extrudes the first air film sleeve; the extrusion synchronization component includes a first cross bar, a sliding vertical bar, a second cross bar and a second abutment ball, the side wall of the strip cover is provided with a side groove along the length direction of the strip cover, the first cross bar is coaxially connected to the connecting rod and horizontally passes through the strip cover through the side groove, the first cross bar is vertically provided with a sliding hole at one end away from the strip cover, and the sliding vertical bar is vertically slidably inserted into the strip cover It is arranged in the sliding hole; a through groove is opened in the welding table on one side of the arc-shaped mounting groove, the second cross bar is horizontally arranged at the bottom of the sliding vertical bar, and the second cross bar extends horizontally to the arc-shaped mounting groove through the through groove; a second arc-shaped rotation groove is opened at the end of the second cross bar away from the sliding vertical bar, the second abutment ball is rotatably arranged in the second arc-shaped rotation groove, and the outer circumference curvature of the second abutment ball is adapted to the inner arc wall of the arc-shaped mounting groove, so as to squeeze the second air film sleeve, so that the expansion movement of the second air film sleeve after being filled with protective gas is limited.

[0009] Preferably, the water cooling mechanism includes a water cooling pipe, and water cooling grooves are symmetrically opened on both sides of the extension groove along the length direction of the welding table. The water cooling pipe is placed in the water cooling groove, and both ends of the water cooling pipe are respectively connected to a water source; the third jet assembly includes a third jet head, and the third jet head is connected to one side of the laser welding head through a bracket, and the nozzle end of the third jet head is close to and facing the laser emitting end of the laser welding head, and the third jet head is connected to the gas source through a telescopic hose.

[0010] In a second aspect, the present application provides a titanium alloy welding method, which adopts the following technical solution: A titanium alloy welding method, using the titanium alloy laser welding device described in the above technical solution for welding, comprises the following steps: Place the two titanium alloy plates to be welded on the welding table, and position the two titanium alloy plates using a positioning fixture; The position of the laser welding assembly is adjusted by the frame so that the moving path of the laser welding assembly is parallel to the joint seam of the two titanium alloy plates in the vertical direction; Start the water cooling mechanism and allow it to perform pre-cooling operation in advance; The gas source is connected to the first jet assembly, the second jet assembly and the third jet assembly, and the laser welding assembly is turned on at the same time, so that the laser welding assembly welds the fitting seam and continuously welds along the fitting seam to form a weld.

[0011] The present invention has the following advantages and beneficial effects: 1. Place two titanium alloy plates to be welded on the welding table, and make the joint seam 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 seam of the two titanium alloy plates in the vertical direction, and make the laser emitting end of the laser welding assembly. Then, the positions of the two titanium alloy plates to be welded are limited by the positioning fixture, the water cooling mechanism is started in advance, and the water cooling mechanism is pre-cooled in advance, and the laser welding assembly, the first jet assembly, the second jet assembly and the third jet assembly are started synchronously. Since multiple first jet assemblies are provided on the frame along the moving path of the laser welding assembly, multiple first jet assemblies can be introduced into the joint seam of the two titanium alloy plates in advance. At the same time, the second jet assembly can be introduced into the back of the joint seam of the two titanium alloy plates in advance. The joint seam of the two titanium alloy plates is always filled with protective gas. Since the laser emitting end of the laser welding component emits laser for welding, the temperature of the laser emitting end is always the highest, so the third jet assembly always sprays protective gas to the laser emitting end of the laser welding component, so that the laser emitting end of the laser welding component and the current weld can always be filled with protective gas, thereby greatly reducing the probability of the weld being oxidized and improving the quality of the titanium alloy after welding; 2. Since the multiple first nozzles and the laser welding head are all in the moving groove, the movement of the laser welding head in the moving groove will inevitably be restricted by the first nozzle. When the avoidance portion is provided, the laser welding head moves with the avoidance portion at the same time, and the first avoidance slope on the avoidance portion will preferentially conflict with the spherical block, so that the spherical block moves in the length direction of the sliding rail under the interference of the first avoidance slope, thereby driving the first nozzle to deviate into the avoidance groove. Exemplarily, in order to improve the interference effect between the first avoidance slope, the smooth transition surface and the second avoidance slope and the spherical block, a polytetrafluoroethylene layer is coated on the first avoidance slope, the smooth transition surface and the second avoidance slope, which can reduce the friction resistance between the spherical block and the first avoidance slope, the smooth transition surface and the second avoidance slope, so that the spherical block is easier to be pushed to deviate. On this basis, when the spherical block is offset, the laser welding head continues to move along the moving strip groove with the avoidance part. Under the elastic force of the avoidance spring, the spherical block will pass through the smooth transition surface and then gradually return to the initial state along the second avoidance slope, thereby driving the first nozzle head from the avoidance groove back to the moving strip groove; in this case, the movement of the laser welding head in the moving strip groove can be less susceptible to interference from the first nozzle head, thereby improving the synergy between the two.

[0012] 3. Due to the abutment restriction of the first abutment ball, the part of the first air film sleeve that can be filled with protective gas can no longer be filled from the gas source end to the abutment position of the first abutment ball. At the same time, since the abutment position of the first abutment ball is synchronized with the position of the laser welding head in the length direction of the strip cover, the moving distance of the first abutment ball and the laser welding head in the length direction of the moving strip groove is the same, so that on the moving strip groove, the first nozzle at the place where the laser welding head has not yet arrived will not produce gas, because there is no protective gas in the first air film sleeve at the corresponding position. In other words, as long as the first nozzle corresponding to the laser welding head has avoided the laser welding head, the protective gas can be filled, and the first nozzle corresponding to the laser welding head that has not avoided the laser welding head cannot be filled with protective gas under the abutment of the first abutment ball. The purpose of this setting is to greatly save the release of protective gas, because no weld is produced in the place where the laser welding head has not yet reached, and there is no need to fill it with protective gas. The places where the laser welding head has reached indicate that a weld has been produced there. At this time, protective gas needs to be filled in, which can greatly save protective gas and avoid unnecessary waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application; Figure 2 It is a partial structural schematic diagram of an embodiment of the present application; Figure 3 This is a partial structural diagram of the embodiment of the present application for showing the internal structure of the strip cover Figure 1 ; Figure 4 yes Figure 3 A magnified view of part A in FIG. Figure 5 This is a partial structural diagram of the embodiment of the present application for showing the internal structure of the strip cover Figure 2 ; Figure 6 This is a partial structural diagram of the embodiment of the present application for showing the internal structure of the strip cover Figure 3 ; Figure 7 This is a partial structural diagram of the embodiment of the present application for showing the internal structure of the strip cover Figure 4 ; Figure 8 This is a cross-sectional view of the structure of the embodiment of the present application. Figure 1 ; Fig. 9 This is a cross-sectional view of the structure of the embodiment of the present application. Figure 2 ; Fig.10 yes Fig. 9 Enlarged view of part B in .

[0015] The markings in the figure are: 1. welding table; 11. arc-shaped placement groove; 12. second air film sleeve; 13. extension strip groove; 14. through strip groove; 2. positioning fixture; 3. welding mechanism; 4. frame; 41. rodless electric cylinder; 42. hydraulic cylinder; 43. strip cover; 431. threaded rod; 432. rotating motor; 433. moving strip groove; 434. arc 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 slope; 5212. plane Sliding transition surface; 5213, second avoidance slope; 53, threaded sleeve; 6, first jet assembly; 61, first jet head; 611, slider; 612, spherical block; 613, extrusion assembly; 6131, connecting rod; 6132, abutment column; 6133, first abutment 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 abutment ball; 7, second jet assembly; 71, second jet head; 8, third jet assembly; 81, third jet head; 9, water cooling mechanism; 91, water cooling pipe. DETAILED DESCRIPTION

[0016] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0017] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0018] In related technologies, titanium alloys are widely used in aerospace, medical equipment, and automobile manufacturing due to their excellent properties such as high strength, corrosion resistance, and low density. However, titanium alloys exhibit special physical and chemical properties during welding, which makes their welding process have higher technical requirements.

[0019] Titanium alloys are extremely active at high temperatures and easily react with elements such as oxygen, nitrogen, and hydrogen. Especially during welding, when the temperature exceeds 400°C, the titanium alloy material will quickly combine with oxygen in the air to form an oxide layer. This layer of oxide will not only increase the brittleness of the welding area, reduce the toughness and strength of the titanium alloy itself, but also significantly affect the density and welding strength of the weld. Therefore, in the titanium alloy welding process, avoiding oxidation is the key to ensuring the quality of the weld.

[0020] In the related art, 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 in the laser welding process, the titanium alloy weld is still prone to oxidation, resulting in the quality of the titanium alloy after welding not meeting the standards. The specific technical problems are mainly manifested in the following two aspects: 1. Oxidation problem at the front end of the weld: During the laser welding process, when the welding head moves in a straight line, although the area where the laser beam acts will be covered by the protective gas, as the welding head moves forward, the front end of the weld will be exposed to the air. This area is not shielded by the protective gas in time, and the titanium alloy is at a high temperature at this time, which is very easy to react with oxygen in the air, causing 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 weld joint.

[0021] 2. Oxidation problem on the back of the weld: When laser welding titanium alloy, the welding area above the welding head is usually covered by the protective gas, but the back part of the weld is often exposed to the air. The heat-affected zone during welding is not limited to the surface of the weld, the back area is also affected by the high temperature. Titanium alloys are very sensitive to gases such as oxygen and nitrogen. Even if the back is not directly in contact with the laser, the temperature of the back will rise during welding to a level high enough to react chemically with 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 very prone to oxidation, resulting in a decrease 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 amplify the impact of welding defects.

[0022] In summary, although the existing laser welding technology has the advantages of high efficiency and precision, due to the high activity of titanium alloy itself, the front and back of the weld are difficult to be fully and continuously protected, resulting in oxidation in different parts of the weld, which ultimately affects the welding quality and the performance of titanium alloy products.

[0023] Based on this, the applicant proposed a laser welding device and a welding method for titanium alloy.

[0024] See also 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.

[0025] 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.

[0026] 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.

[0027] On this basis, two titanium alloy plates to be welded are placed on the welding table 1, and the joint seams of the two titanium alloy plates to be welded are directly below the laser welding assembly 5, and the moving path of the laser welding assembly 5 is parallel to the joint seams of the two titanium alloy plates in the vertical direction, and the laser emitting end of the laser welding assembly 5 is set. Then, the positions of the two titanium alloy plates to be welded are limited by the positioning fixture 2, the water cooling mechanism 9 is started in advance, and the water cooling mechanism 9 is pre-cooled in advance, and the laser welding assembly 5, the first jet assembly 6, the second jet assembly 7 and the third jet assembly 8 are started synchronously. Since multiple first jet assemblies 6 are provided on the frame 4 along the moving path of the laser welding assembly 5, multiple first jet assemblies 6 can be introduced into the joint seams of the two titanium alloy plates in advance. At the same time, the second jet assembly 7 can be introduced into the back of the joint seams of the two titanium alloy plates in advance. The joint seams of the two titanium alloy plates are always filled with protective gas. Since the laser emitting end of the laser welding component 5 emits laser for welding, the temperature of the laser emitting end is always the highest. Therefore, the third jet component 8 always sprays protective gas to the laser emitting end of the laser welding component 5, so that the laser emitting end of the laser welding component 5 and the current weld can always be filled with protective gas, thereby greatly reducing the probability of the weld being oxidized and improving the quality of the titanium alloy after welding.

[0028] At the same time, the water cooling mechanism 9 cools down the weld of the titanium alloy plate after welding. Rapid cooling can reduce the temperature of the heat-affected zone, reduce the organizational changes in the heat-affected zone, and reduce the possibility of grain coarsening and phase change. Effective cooling can reduce the stress in the weld, reduce the risk of deformation and cracks, and thus improve the overall quality and reliability of the weld.

[0029] In some embodiments, Figure 1 , Figure 2 As shown, the frame 4 includes a rodless electric cylinder 41, a hydraulic cylinder 42 and a strip cover 43. A group of rodless electric cylinders 41 are provided on each side of the welding table 1, and the two groups of rodless electric cylinders 41 operate synchronously. The hydraulic cylinder 42 is provided on the moving 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 provided on the top of the two hydraulic cylinders 42, and the laser welding assembly 5 is slidably provided on the strip cover 43 along the length direction of the strip cover 43.

[0030] For example, the length direction of the rodless electric cylinder 41 is consistent with the width direction of the welding table 1. With this arrangement, the position of the laser welding assembly 5 in the horizontal direction and the vertical direction can be adjusted by the rodless electric cylinder 41 and the hydraulic cylinder 42, so that the laser welding assembly 5 can adapt to titanium alloy plates of different thicknesses and improve welding applicability. At the same time, the laser welding assembly 5 can be brought closer to the part to be welded, thereby improving the welding quality.

[0031] In some embodiments, reference Figure 1 , Figure 2 The laser welding assembly 5 includes a movable seat 51, a laser welding head 52 and a threaded sleeve 53. The threaded sleeve 53 and the laser welding head 52 are both arranged on the movable seat 51. A threaded rod 431 is provided along the top of the strip cover 43. A rotating motor 432 is provided near the end of the strip cover 43. The output shaft of the rotating motor 432 is coaxially connected with the threaded rod 431. The threaded sleeve 53 is threadedly sleeved on the threaded rod 431. The upper and lower walls of the strip cover 43 are parallel to the strip cover 43 and are provided with movable strip grooves 433. 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.

[0032] Exemplarily, the laser welding head 52 is electrically connected to the power supply through a spring wire (not shown in the figure), and the laser welding head 52 can be operated by starting the power supply. On this basis, after starting the rotating motor 432, the moving seat 51 can be moved along the length direction of the moving groove 433 through the cooperation of the threaded rod 431 and the threaded sleeve 53. At this time, if the moving groove 433 and the joint seam of the two titanium alloy plates are in a parallel state in the vertical direction, the laser welding head 52 can weld the joint seam along the length direction of the joint seam to form a weld, thereby achieving the effect of automatic welding of the titanium alloy plates and improving the welding efficiency. Exemplarily, the rotating motor 432 can adjust the speed according to the on-site requirements so that the movement of the laser welding head 52 can meet the best welding conditions.

[0033] In some embodiments, Figure 3 to Figure 7 As shown, an arc plate 434 is provided inside the strip cover 43 along the length direction of the strip cover 43, and a first air film cover 435 is bonded inside the arc plate 434 along the length direction of the arc plate 434, and the first air film cover 435 is connected to the gas source. When the first air film cover 435 is filled with protective gas, the cross-sectional shape of the first air film cover 435 gradually expands to a circle when the protective gas is filled. Exemplarily, the curvature of the arc plate 434 is an arc, that is, the arc plate 434 is extended, and the arc plate 434 can form a circle.

[0034] At the same time, the first jet assembly 6 includes a first jet head 61, which is connected to the first air film sleeve 435 through a telescopic hose 62, and the nozzle end of the first jet head 61 extends vertically downward to near the weld after passing through the movable strip groove 433. Exemplarily, the air source is connected to the first jet assembly 6, the second jet assembly 7 and the third jet assembly 8 at the same time through an air pump (not shown in the figure).

[0035] After such arrangement, by turning on the air pump, the protective gas is inputted from the gas source into the first air film sleeve 435, and the first air film sleeve 435 expands, so that the first air film sleeve 435 is filled with gas. At the same time, the gas in the first air film sleeve 435 is directly inputted into the first spray head 61 through the telescopic hose 62, and the first spray head 61 directly sprays the protective gas, thereby achieving a more convenient effect of outputting the protective gas.

[0036] Exemplarily, in order to increase the service life of the first air film cover 435, the material of the first air film cover 435 is any one of polyurethane, chloroprene rubber, and polyester fiber reinforced PVC.

[0037] In some embodiments, Figures 4 to 7 As shown, the laser welding head 52 is provided with an avoidance portion 521 located in 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 .

[0038] Specifically, 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, and a slider 611 is arranged on the outer periphery of the first nozzle 61, and 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, and the avoidance groove 4361 located on the bottom wall of the sliding rail 436 is connected to the moving strip groove 433, and an avoidance spring 4362 is arranged 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.

[0039] At the same time, a spherical block 612 is provided directly above the first nozzle 61, and the spherical block 612 is directly opposite to a part of the first avoidance slope 5211 in the length direction of the strip cover 43. When the laser welding head 52 moves along the movable groove 433 and approaches the first nozzle 61, the spherical block 612 slides and fits against the first avoidance slope 5211 and deviates to one side of the movable 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 movable groove 433, the first nozzle 61 is reset to the extension path of the movable groove 433 under the action of the avoidance spring 4362.

[0040] In this arrangement, since the plurality of first nozzles 61 and the laser welding head 52 are all in the moving groove 433, the movement of the laser welding head 52 in the moving groove 433 will inevitably be restricted by the first nozzle 61. When the avoidance portion 521 is provided, the laser welding head 52 moves with the avoidance portion 521, and the first avoidance slope 5211 on the avoidance portion 521 will preferentially conflict with the spherical block 612, so that the spherical block 612 moves in the length direction of the sliding rail 436 under the conflict of the first avoidance slope 5211, thereby driving the first nozzle 61 to deviate into the avoidance groove 4361. Exemplarily, in order to improve the interference effect between the first avoidance slope 5211, the smooth transition surface 5212, the second avoidance slope 5213 and the spherical block 612, a polytetrafluoroethylene layer is coated on the first avoidance slope 5211, the smooth transition surface 5212, and the second avoidance slope 5213, which can reduce the friction resistance between the spherical block 612 and the first avoidance slope 5211, the smooth transition surface 5212, and the second avoidance slope 5213, so that the spherical block 612 can be more easily pushed to deflect.

[0041] On this basis, when the spherical block 612 is offset, the laser welding head 52 continues to move along the moving groove 433 with the avoidance part 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 return to the initial state along the second avoidance slope 5213, thereby driving the first nozzle 61 from the avoidance groove 4361 back to the moving groove 433; in this case, the movement of the laser welding head 52 in the moving groove 433 can be less susceptible to interference from the first nozzle 61, thereby improving the synergy between the two.

[0042] In some embodiments, reference Figure 5 to Figure 7 The laser welding head 52 is also provided with an extrusion assembly 613, which is used to squeeze the first air film cover 435 so that the space for the protective gas in the first air film cover 435 is limited, and in the length direction of the strip cover 43, the limited portion of the space for the protective gas is synchronized with the position of the laser welding head 52. Specifically, the extrusion assembly 613 includes 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 moving strip groove 433.

[0043] At the same time, the abutment column 6132 is vertically installed on the connecting rod 6131, and the lower end surface of the abutment column 6132 is provided with a first arc-shaped rotation groove. 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 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 limited.

[0044] With such a configuration, the portion of the first air film sleeve 435 that can be filled with protective gas cannot be filled further from the gas source end to the abutment position of the first abutment ball 6133 due to the abutment restriction of the first abutment ball 6133. At the same time, since the abutment position of the first abutment ball 6133 is synchronized with the position of the laser welding head 52 in the length direction of the strip cover 43, the moving distance of the first abutment ball 6133 and the laser welding head 52 in the length direction of the moving strip groove 433 is the same, so that gas will not be generated in the first jet head 61 at the place on the moving strip groove 433 where the laser welding head 52 has not yet arrived, because there is no protective gas in the first air film sleeve 435 at the corresponding position. 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 protective gas, 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 protective gas due to the abutment of the first abutment ball 6133.

[0045] The purpose of such a setting is to greatly save the release of shielding gas, because there is no weld in the place where the laser welding head 52 has not reached, so there is no need to fill shielding gas. The place where the laser welding head 52 has reached indicates that a weld has been formed there, and shielding gas needs to be filled at this time, thereby greatly saving shielding gas and avoiding unnecessary waste.

[0046] In some embodiments, Figure 8 to Figure 10As shown, an arc-shaped receiving groove 11 is provided in the welding table 1 along the length direction of the welding table 1, and a second air film sleeve 12 is bonded in the arc-shaped receiving groove 11 along the length direction of the arc-shaped receiving groove 11, and the second air film sleeve 12 is connected to the gas source. 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 circle when the protective gas is filled. The second jet assembly 7 includes a second jet head 71, and an extension groove 13 is provided in the welding table 1 along the length direction of the welding table 1. The upper end opening of the extension groove 13 is opposite to the weld, and the lower end opening is connected to the arc-shaped receiving groove 11. A plurality of 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 in the extension groove 13 and vertically upward toward the weld of the titanium alloy plate. Exemplarily, in order to improve the installation stability of the second air jet heads 71 ​​, a plurality of second air jet heads 71 ​​are bonded into the extension groove 13 , that is, when the second air film sleeve 12 is squeezed by the second abutting ball 634 , the position of the second air jet heads 71 ​​is not affected.

[0047] With such arrangement, there are also multiple second nozzles 71 on the back of the weld. By filling the second air film sleeve 12 with protective gas, the protective gas can be filled on the back of the weld, so that the protective gas appears in the area where it should appear, thereby improving the utilization rate of the protective gas and further reducing the oxidation rate of the weld.

[0048] In some embodiments, Figure 9-10 As shown, the laser welding head 52 is provided with an extrusion synchronization component 63, which 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. Specifically, the extrusion synchronization component 63 includes a first crossbar 631, a sliding vertical rod 632, a second crossbar 633 and a second abutment ball 634, and a side groove 437 is provided on the side wall of the strip cover 43 along the length direction of the strip cover 43. The first crossbar 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 crossbar 631 away from the strip cover 43, and the sliding vertical rod 632 is vertically slidably inserted into the sliding hole 6311; At the same time, a through groove 14 is opened on one side of the arc-shaped mounting groove 11 in the welding table 1, and a second cross bar 633 is horizontally arranged at the bottom of the sliding vertical rod 632, and the second cross bar 633 extends horizontally to the arc-shaped mounting groove 11 through the through groove 14; a second arc-shaped rotation groove is opened at the end of the second cross bar 633 away from the sliding vertical rod 632, and a second abutment ball 634 is rotatably arranged in the second arc-shaped rotation groove, and the outer circumferential curvature of the second abutment ball 634 is adapted to the inner arc wall of the arc-shaped mounting groove 11, so as 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 limited.

[0049] Exemplarily, the first gas shower heads correspond one to one with the second gas shower heads on a vertical line along the arrangement direction.

[0050] With such arrangement, when the laser welding head 52 drives the first contact ball 6133 to move along the length direction of the strip cover 43, the connection between the first cross bar 631, the sliding vertical bar 632 and the second cross bar 633 can also synchronously drive the second contact ball 634 to move along the length direction of the second arc-shaped rotating groove, so that the second contact ball 634 also limits the inflation position of the second air film sleeve 12. In other words, as long as the part of the first air film sleeve 435 corresponding to the first air jet 61 that has avoided the laser welding head 52 can be filled with protective gas, the part of the second air film sleeve 12 connected to the corresponding second air jet 71 can also be filled with protective gas, while the first air film sleeve 435 corresponding to the first air jet 61 that has not avoided the laser welding head 52 cannot be filled with protective gas under the abutment of the first contact ball 6133, and the part of the second air film sleeve 12 connected to the corresponding second air jet 71 cannot be filled with protective gas, so that the discharge of the protective gas is further controlled, effectively reducing the waste of protective gas.

[0051] In some embodiments, Fig. 9 , Fig.10 As shown, the water cooling mechanism 9 includes a water cooling pipe 91. Water cooling grooves are symmetrically opened on both sides of the extended strip groove 13 along the length direction of the welding platform 1. The water cooling pipe 91 is placed in the water cooling groove, and the two ends of the water cooling pipe 91 are respectively connected to the water source (not shown in the figure). Exemplarily, the material of the water cooling pipe 91 is 304 or 316 stainless steel, so that the water cooling pipe 91 has good high temperature resistance and strength, and has a certain corrosion resistance, which is suitable for high temperature and high pressure environments. When cold water passes through, the heat at the weld can be effectively taken away.

[0052] In some embodiments, Figure 5 As shown, the third jet assembly 8 includes a third jet head 81, which is connected to one side of the laser welding head 52 through a bracket, and the nozzle end of the third jet head 81 is close to and faces the laser emitting end of the laser welding head 52. The third jet head 81 is connected to the gas source through a hose, and the shielding gas is always sprayed to the laser emitting end of the laser welding head 52 through the third jet head 81. It is worth noting that the second jet head 71 is also connected to the gas source through a hose.

[0053] Exemplarily, the connection between the first jet head 61 and the first air film sleeve 435 avoids the abutment surface of the first abutment ball 6133 , and the connection between the second jet head 71 and the second air film sleeve 12 avoids the abutment surface of the second abutment ball 634 .

[0054] Please refer to Figures 1 to 10Some embodiments of the present application also disclose a titanium alloy welding method, which uses the titanium alloy laser welding device in the above embodiment to weld, including the following steps: Place two titanium alloy plates to be welded on a welding table 1, and position the two titanium alloy plates using a positioning fixture 2; The position of the laser welding assembly 5 is adjusted by the frame 4 so that the moving path of the laser welding assembly 5 is parallel to the joint seam of the two titanium alloy plates in the vertical direction; Start the water cooling mechanism 9 to allow the water cooling mechanism 9 to perform pre-cooling operation in advance; 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 fitting seam and continuously welds along the fitting seam to form a weld.

[0055] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by 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.

Images