Titanium alloy control surface laser welding coaxial gas protection device

Abstract

The utility model discloses a titanium alloy control surface laser welding coaxial gas protection device which comprises a connecting rod, a limiting plate, a coaxial fixing plate, a sleeve, a coaxial inner cover, a follow-up corrugated pipe and a coaxial outer cover. The coaxial fixing plate is fixed at one end of the connecting rod, the coaxial fixing plate is connected with the sleeve, the inner diameter of the sleeve is connected with the coaxial inner cover, the outer diameter of the sleeve is connected with the follow-up corrugated pipe, the follow-up corrugated pipe is connected with the coaxial outer cover, and the limiting plate is connected with the connecting rod. According to the utility model, the coaxial output of the protective gas is realized, the protective gas pipeline is prevented from moving along with the change of the welding direction, the adjustability and the flexibility of external protection are improved, and the full protection of each welding seam position in the welding process is ensured; the problems that titanium alloy control surface laser welding gas protection is poor in stability, high in protection adjustment precision and large in adjustment workload are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of laser welding, and in particular relates to a coaxial gas protection device for laser welding of titanium alloy rudder surfaces. Background Art

[0002] The position adjustment of the protective nozzle during the laser welding of titanium alloy rudders is highly repetitive. Generally, a drag shield type protective nozzle device is used. After the rudder frame and skin are tried and tested, and the size is inspected and qualified, pure laser welding is used for welding and assembly. The weld includes two links: intermittent welding and full welding. The traditional drag shield position adjustment laser spot and nozzle distance range is 3-4mm, and the protective nozzle and workpiece surface are 2-2.5mm, requiring very high adjustment accuracy and difficulty. The drag shield type protective nozzle is composed of a plastic universal joint and a gas protection copper nozzle. Due to the high sensitivity of manual adjustment, the universal joint is prone to wear, which makes it difficult to fix the position of the gas protection copper nozzle. Repeated adjustments are required to meet the above position requirements. When the gap between the gas protection nozzle and the laser focus is small, the laser energy transmission path is affected, which is easy to cause the universal joint and nozzle to burn. When the gap is large, it is easy to cause the gas protection failure during the entire welding process, affecting the quality of the weld and making it difficult to ensure product quality.

[0003] Most of the existing titanium alloy rudder laser welding gas protection devices use side and rear protection nozzles to supply gas, or use a hood behind the molten pool to provide inert gas protection during the welding process. Since titanium alloy welds have very high requirements for gas protection, the above method, on the one hand, has insufficient protection distance due to the influence of the weld position or clamping position; on the other hand, the protection device cannot perform multi-plane continuous welding, resulting in unreliable gas protection during the solidification of the molten pool, which can easily cause the surface of the titanium alloy rudder weld to appear blue, black, or even gray.

[0004] For example, the Chinese patent with publication number CN216966641U discloses a coaxial gas protection device for laser welding, including an air curtain, a nozzle and an adjustable connecting plate, wherein the air curtain is connected to the nozzle through the adjustable connecting plate; the air curtain includes an air knife, an air knife mounting seat, a first air pipe joint and a shielding plate, wherein the air knife includes an air knife base and an air knife cover plate, wherein the air knife cover plate is fixedly connected to the front of the air knife base, and the nozzle includes a second air pipe joint, a nozzle upper cover and a nozzle base, wherein the nozzle base is arranged at the bottom of the nozzle upper cover; the device has a simple structure and is easy to operate, and the air curtain part can protect the lens, thereby avoiding frequent replacement of the protective lens and saving costs; the nozzle part can better protect the weld from oxidation compared with the traditional side blowing, especially when welding circular welds, and at the same time, since the nozzle has three vents, different types of gases can be introduced in proportion at the same time. However, it is not designed for laser welding of titanium alloy rudder surfaces, and no outer cover is provided, so the protection stability is insufficient and the gas utilization rate is low. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a titanium alloy rudder surface laser welding coaxial gas protection device.

[0006] The utility model is realized through the following technical solutions.

[0007] The utility model provides a titanium alloy rudder surface laser welding coaxial gas protection device, comprising: a connecting rod, a limit plate, a coaxial fixing plate, a sleeve, a coaxial inner cover, a follower type bellows and a coaxial outer cover; the coaxial fixing plate is fixed to one end of the connecting rod, the coaxial fixing plate is connected to the sleeve, the inner diameter of the sleeve is connected to the coaxial inner cover, the outer diameter of the sleeve is connected to the follower type bellows, the follower type bellows is connected to the coaxial outer cover, and the limit plate is connected to the connecting rod.

[0008] Preferably, the coaxial fixing plate, sleeve, coaxial inner cover and follower bellows are connected and fixed by internal and external threads.

[0009] Preferably, a plurality of holes are provided on the limiting plate and the coaxial fixing plate, and the connecting rod passes through the holes of the limiting plate and the coaxial fixing plate.

[0010] Preferably, the connecting rod and the coaxial fixing plate are fixed by bolt connection.

[0011] Preferably, the outer diameter of the connecting rod is a plane along the length direction and is provided with equally spaced concave points. The limit plate and the connecting rod are connected by bolts, and the bolts are tightened to the concave points for precise positioning.

[0012] Preferably, the follower bellows is provided with a threaded interface at one end and a tightening groove at the other end.

[0013] Preferably, the coaxial fixing plate is provided with a plurality of interfaces, and hoses are provided in the interfaces.

[0014] The beneficial effects of the utility model are:

[0015] 1. The shielding gas is coaxially output, which prevents the shielding gas pipeline from moving with the change of welding direction. It is suitable for welding of various types of welds such as straight lines, curves, and arcs. The time consumption of adjusting the gas shielding device during welding is significantly reduced;

[0016] 2. The gas cavity is designed as a coaxial inner cover and a coaxial outer cover, which reduces the volume of the cavity filled with inert protective gas and improves the utilization rate of the protective gas;

[0017] 3. A coaxial inner cover and a coaxial outer cover are provided, and the coaxial outer cover is connected to a follow-up bellows, which improves the adjustability and flexibility of the external protection, ensures that each weld position is fully protected during the welding process, and solves the problems of poor gas protection stability, high protection adjustment accuracy, and heavy adjustment workload in laser welding of titanium alloy rudder surfaces;

[0018] 4. Simple structure, easy maintenance, convenient installation, strong reliability, and effectively improve the working efficiency of laser welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a side view of the overall structure of an embodiment of the utility model;

[0020] Figure 2 It is a front view of the overall structure of an embodiment of the utility model.

[0021] In the figure: 1-connecting rod, 2-limiting plate, 3-coaxial fixing plate, 4-sleeve, 5-coaxial inner cover, 6-follow-up bellows, 7-coaxial outer cover. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0023] like Figure 1 , 2 As shown, a coaxial gas protection device for laser welding of titanium alloy rudder surface comprises: a connecting rod 1, a limiting plate 2, a coaxial fixing plate 3, a sleeve 4, a coaxial inner cover 5, a follower bellows 6 and a coaxial outer cover 7; the coaxial fixing plate 3 is fixed to one end of the connecting rod 1, the coaxial fixing plate 3 is connected to the sleeve 4, the inner diameter of the sleeve 4 is connected to the coaxial inner cover 5, the outer diameter of the sleeve 4 is connected to the follower bellows 6, the follower bellows 6 is connected to the coaxial outer cover 7, and the limiting plate 2 is connected to the connecting rod 1.

[0024] The coaxial fixing plate 3, the sleeve 4, the coaxial inner cover 5 and the follower bellows 6 are connected and fixed by internal and external threads.

[0025] Internal and external thread connections ensure reliable connections of each structure.

[0026] The limiting plate 2 and the coaxial fixing plate 3 are provided with a plurality of holes, and the connecting rod 1 passes through the holes of the limiting plate 2 and the coaxial fixing plate 3 .

[0027] Several connecting rods 1 pass through the holes of the limiting plate 2 and the coaxial fixing plate 3, avoiding bending and torsional deformation of the single axis under long-term load, improving the stress state of other structures, and ensuring that the central axis of the sleeve 4 is coaxial with the center of the laser spot diameter.

[0028] In this embodiment, two holes are respectively provided on the limiting plate 2 and the coaxial fixing plate 3, and the number of connecting rods is 2.

[0029] The connecting rod 1 and the coaxial fixing plate 3 are fixed by bolt connection.

[0030] The outer diameter of the connecting rod 1 is a plane along the length direction and is provided with equally spaced concave points. The limit plate 2 and the connecting rod 1 are connected by bolts, and the bolts are tightened to the concave points for precise positioning.

[0031] Ensure that the coaxial fixing plate 3 is always in a horizontal state, and the distance that the connecting rod 1 exceeds the lower part of the coaxial fixing plate 3 does not affect the connection between the coaxial fixing plate 3 and the sleeve 4.

[0032] When adjusting the height, it is only necessary to adjust the relative position between the connecting rod 1 and the limiting plate 2 .

[0033] The bolt connection ensures reliable connection and is easy to disassemble and maintain.

[0034] In this embodiment, the connecting rod 1 is made of stainless steel, the coaxial fixing plate 3 and the sleeve 4 are made of aluminum alloy, and the coaxial inner cover 5 and the coaxial outer cover 7 are made of copper.

[0035] The connecting rod 1 is made of stainless steel, which has good processing performance, strong material adaptability and is not easy to corrode.

[0036] The coaxial fixing plate 3 and the sleeve 4 are made of aluminum alloy, which is light in weight and meets the stability requirements during the moving process.

[0037] The coaxial inner cover 5 and the coaxial outer cover 7 are made of copper material, which increases heat dissipation during welding and improves service life. At the same time, the coaxial inner cover 5 prevents splashes from interfering with the laser spot path during welding.

[0038] The follower bellows 6 is provided with a threaded interface at one end and a tightening groove at the other end.

[0039] The coaxial outer cover 7 is convenient for disassembly, assembly and cleaning, and the position can be adjusted according to the inclined surface and the curved surface.

[0040] The coaxial fixing plate 3 is provided with a plurality of interfaces, and hoses are provided in the interfaces.

[0041] The inert protective gas flows out from the interface through the hose to fill the gas cavity in a spiral manner, and the inert gas flow in each area of ​​the cavity between the coaxial inner cover 5 and the coaxial outer cover 7 is more uniform.

[0042] In this embodiment, a total of 4 interfaces are provided.

[0043] The gas pipeline of the utility model is connected to the upper connection hole of the coaxial fixing plate 3, and the inert protective gas reaches the cavity area between the coaxial inner cover 5 and the coaxial outer cover 7 through the sleeve 4. During the whole welding process, the coaxial protective gas device is at a fixed height from the surface to be welded. Only the height and angle of the coaxial outer cover 7 need to be adjusted, which is easy to operate and improves the stability of the utility model.

[0044] The utility model realizes coaxial output of shielding gas, avoids the movement of shielding gas pipeline with the change of welding direction, is suitable for welding of various types of welds such as straight line, curve and circular arc, and the time consumption of adjusting gas shielding device during welding is significantly reduced; the gas inner cavity is designed as coaxial inner cover and coaxial outer cover, which reduces the volume of the cavity filled with inert shielding gas and improves the utilization rate of shielding gas; a coaxial inner cover and a coaxial outer cover are provided, and the coaxial outer cover is connected with a follow-up bellows, which improves the adjustability and flexibility of external protection, ensures that each weld position is fully protected during welding, and solves the problems of poor stability of gas shielding, high protection adjustment accuracy and large adjustment workload in laser welding of titanium alloy rudder surface; the utility model has the advantages of simple structure, easy maintenance, convenient installation and strong reliability, and effectively improves the working efficiency of laser welding.

Claims

1. A coaxial gas protection device for laser welding of titanium alloy rudder surface, characterized in that: include: A connecting rod (1), a limiting plate (2), a coaxial fixing plate (3), a sleeve (4), a coaxial inner cover (5), a follower-type bellows (6) and a coaxial outer cover (7); the coaxial fixing plate (3) is fixed to one end of the connecting rod (1), the coaxial fixing plate (3) is connected to the sleeve (4), the inner diameter of the sleeve (4) is connected to the coaxial inner cover (5), the outer diameter of the sleeve (4) is connected to the follower-type bellows (6), the follower-type bellows (6) is connected to the coaxial outer cover (7), and the limiting plate (2) is connected to the connecting rod (1).

2. A titanium alloy rudder surface laser welding coaxial gas protection device as claimed in claim 1, characterized in that: The coaxial fixing plate (3), the sleeve (4), the coaxial inner cover (5) and the follower type bellows (6) are connected and fixed by means of internal and external threads.

3. A titanium alloy rudder surface laser welding coaxial gas protection device as claimed in claim 1, characterized in that: The limiting plate (2) and the coaxial fixing plate (3) are provided with a plurality of holes, and the connecting rod (1) passes through the holes of the limiting plate (2) and the coaxial fixing plate (3).

4. A titanium alloy rudder surface laser welding coaxial gas protection device as claimed in claim 1, characterized in that: The connecting rod (1) and the coaxial fixing plate (3) are fixed by bolt connection.

5. The titanium alloy rudder surface laser welding coaxial gas protection device as claimed in claim 1, characterized in that: The outer diameter of the connecting rod (1) is a plane along the length direction and is provided with equally spaced concave points. The limit plate (2) and the connecting rod (1) are connected by bolts, and the bolts are tightened to the concave points for precise positioning.

6. A titanium alloy rudder surface laser welding coaxial gas protection device as claimed in claim 1, characterized in that: The follower type bellows (6) is provided with a threaded interface at one end and a tightening groove at the other end.

7. The titanium alloy rudder surface laser welding coaxial gas protection device as claimed in claim 1, characterized in that: The coaxial fixing plate (3) is provided with a plurality of interfaces, and hoses are provided in the interfaces.

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