A titanium alloy laser welding seam front protection device and a protection method thereof

Abstract

The present application relates to a kind of titanium alloy laser welding weld front protection device and its protection method, including base, protective shell, welding piece body and welding fixture;The protective shell is placed on the upper surface of base, and the welding piece body is in the intermediate position between base and protective shell;The surface of the base is equipped with back protection seat, wherein the same net exists in back protection seat with arc-shaped grid frame and circular grid frame.The scheme realizes the automatic rotation of arc-shaped grid frame by the linkage design of adjusting mechanism and transmission shaft, reduces manual intervention, improves operation efficiency;The whole welding process is placed in the protection device in the scheme, air is isolated, atmospheric pollution is avoided, and protective nozzle needs not to be installed on laser head, tail drag cover is saved, complex protection gas pipeline system is avoided in the welding process, protection system is simplified, which helps to improve welding efficiency.

Description

Technical Field

[0001] This invention belongs to the field of laser welding technology, specifically a protective device and method for the front side of laser weld seams in titanium alloys. Background Technology

[0002] Currently, the gas protection method for titanium alloy laser welding mainly uses coaxial or off-axis nozzles to protect the molten pool, and then uses a tail shroud to protect the high-temperature area of ​​the weld, ultimately achieving overall protection of the weld front. However, this protection method requires the cooperation of the nozzle, tail shroud, and laser welding robot during the welding process to achieve the protection effect. It also requires multiple gas sources, making the device complex. Furthermore, the final fume extraction contains a large amount of pollutants, directly affecting the working environment.

[0003] In view of this, a protective device and method for the front side of laser weld seams in titanium alloys are proposed. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] Given the following technical problems in the existing technology: the gas protection method for titanium alloy laser welding mainly uses coaxial or off-axis nozzles to protect the molten pool, and then uses a tail shroud to protect the high-temperature area of ​​the weld, ultimately achieving overall protection of the weld front; however, this protection method requires the cooperation of the nozzle, tail shroud and laser welding robot to achieve the protection effect, and requires multiple gas sources, making the device complex, and the final fume extraction contains a large amount of pollutants, directly affecting the working environment.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a protective device for the front side of a laser weld seam in titanium alloys, comprising a base, a protective shell, a workpiece body, and a welding fixture;

[0007] The protective shell is placed on the upper surface of the base, and the weldment body is located between the base and the protective shell;

[0008] The base is provided with a back protection seat, which contains a mesh similar to the arc-shaped mesh frame and the circular mesh frame. The back protection seat can intercept and treat some of the residual smoke on the back of the weldment body.

[0009] The upper surface of the protective shell is provided with an upper laser welding groove, and the lower surface of the protective shell is provided with a lower laser welding groove so that the laser can irradiate the welding position. A pair of positioning seats are provided at the inner corner of the protective shell. The positioning seats are provided with a semi-circular groove and an opening groove is provided on the outer periphery of the positioning seats. The opening groove is used to introduce the smoke to the position of the treatment mechanism. The treatment mechanism is arranged in the semi-circular groove, and the treatment mechanism is used to intercept and block impurities in the smoke.

[0010] The protective shell is provided with a discharge tube, which is connected to a fan. An adjustment mechanism is provided in the discharge tube.

[0011] As a preferred technical solution for a protective device for the front side of a laser weld on titanium alloys, a welding fixture is installed at the edge of the upper surface of the base. The welding fixture is used to limit the position of the workpiece body and ensure the stability of the workpiece body during laser welding.

[0012] As a preferred technical solution for a protective device for the front side of laser welded seams of titanium alloys, the inner edge of the semi-arc groove is provided with a groove, and a scraper is installed in the groove. The scraper is used to scrape off impurities on the surface of the arc-shaped grid frame. The inner edge of the protective shell is provided with a shaking module, which includes a flexible pad and an elastic element. The flexible pad is hinged to the inner edge of the protective shell, and the elastic element is located on the back of the flexible pad. When the bracket rotates, it will collide with the flexible pad, which can help shake off impurities on the arc-shaped grid frame.

[0013] As a preferred technical solution for a protective device for the front side of laser welded seams of titanium alloys, the treatment mechanism includes a drive shaft, a bracket, a long frame and an arc-shaped grid frame. The drive shaft rotates within the protective housing, and the axis of the drive shaft coincides with the axis of the semi-arc groove. Multiple brackets are installed on the outer periphery of the drive shaft.

[0014] As a preferred technical solution for a protective device for the front side of a laser weld on titanium alloys, each of the multiple brackets has a long frame installed at the end away from the drive shaft, and an arc-shaped grid frame is installed between the multiple long frames, wherein the arc-shaped grid frame is used to purify the fumes generated during welding.

[0015] As a preferred technical solution for a protective device for the front side of laser welded titanium alloys, the adjustment mechanism includes a support base, a guide rod, and a circular grid frame. The support base is located on the inner edge of the outlet cylinder. The outlet cylinder and the long frame are hinged. The circular grid frame extends and retracts along the inner edge of the outlet cylinder. It can be used for secondary purification, and when its position changes, it can be linked with the arc-shaped grid frame to change position.

[0016] As a preferred technical solution for a protective device for the front side of laser welded seams of titanium alloys, the support seat has a telescopic guide rod. One end of the guide rod extending out of the support seat is connected to the edge of the circular grid frame. One end of the guide rod extending into the support seat is fixedly connected to a spring. The other end of the spring is connected to the inner edge of the support seat. When the arc-shaped grid frame is normally ventilated, the circular grid frame can return to its initial state under the action of the spring.

[0017] As a preferred technical solution for a protective device for the front side of laser welded titanium alloys, the inner edge of the circular grid frame is provided with a protrusion, and the surface of the drive shaft is provided with a spiral groove. The protrusion is located in the spiral groove. When the position of the protrusion changes with the circular grid frame, the drive shaft can be rotated through the spiral groove.

[0018] As a preferred technical solution for a protective device for the front side of laser welded titanium alloys, a support arm is provided on the inner edge of the bearing seat, and a bearing sleeve is installed at the end of the support arm away from the bearing seat. One end of the transmission shaft is rotatably connected to the bearing sleeve to ensure stable rotation of the transmission shaft.

[0019] A method for protecting the front side of laser welds on titanium alloys includes the following steps:

[0020] S1. Place the workpiece body on the base and align the protective shell onto the workpiece body. Align the upper laser welding groove and the lower laser welding groove with the welding positions of the workpiece body and limit the position of the workpiece body using the welding fixture.

[0021] S2. Connect an external fan to the outlet cylinder and run the fan while welding. At this time, the welding fumes of the workpiece body will enter the arc-shaped grid frame under the attraction. The arc-shaped grid frame will intercept the impurities in the welding fumes. The gas after preliminary purification passes through the circular grid frame and is discharged from the outlet cylinder.

[0022] S3. When more impurities are gradually adsorbed on the outer edge of the arc-shaped mesh frame, the suction force will directly act on the circular mesh frame to change position. When the circular mesh frame moves, it drives the drive shaft to rotate through the protrusions and spiral grooves. The drive shaft drives the arc-shaped mesh frame to rotate through the bracket. At this time, several other arc-shaped mesh frames are facing the welding position.

[0023] S4. At this moment, the arc-shaped mesh frame with more external adsorption of impurities will rotate to the position of the scraper, and the scraper will scrape it off. At the same time, the support will collide with the flexible pad when rotating, which can help the impurities on the arc-shaped mesh frame fall off. During normal ventilation, under the action of the spring, the circular mesh frame and the drive shaft can be linked to reset.

[0024] The beneficial effects of this invention are:

[0025] 1. This solution achieves preliminary and secondary purification of fumes and impurities generated during welding by setting up arc-shaped and circular grid frames, effectively reducing the emission of harmful substances and improving the safety of the working environment;

[0026] 2. This solution, through the design of scrapers and shaking modules, can automatically scrape off and shake off impurities adsorbed on the arc-shaped grid frame, maintaining purification efficiency and extending the service life of the device;

[0027] 3. This solution achieves automatic rotation of the arc-shaped grid frame by adjusting the linkage design between the mechanism (including the circular grid frame, springs, and spiral grooves) and the drive shaft, thereby reducing manual intervention and improving operational efficiency;

[0028] 4. This solution places the entire welding process within a protective device, isolating it from air and avoiding atmospheric pollution. It also eliminates the need for a protective nozzle on the laser head, removes the tail cover, and avoids the use of a complex protective gas pipeline system during welding. This simplifies the protection system and helps improve welding efficiency.

[0029] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 This is a schematic diagram of the protective casing of the present invention.

[0033] Figure 3 Based on the present invention Figure 2 Cutting diagram Figure 1 .

[0034] Figure 4 Based on the present invention Figure 3 Enlarged diagram of point A in the middle.

[0035] Figure 5 Based on the present invention Figure 2 Cutting diagram Figure 2 .

[0036] Figure 6 This is a schematic diagram of the positioning seat of the present invention.

[0037] Figure 7 This is a schematic diagram of the circular grid frame of the present invention.

[0038] Figure 8 This is a schematic diagram of the jitter module of the present invention.

[0039] Figure label:

[0040] 100. Base; 101. Back Protector; 200. Protective Shell; 201. Upper Laser Welding Groove; 202. Lower Laser Welding Groove; 210. Positioning Seat; 211. Semi-arc Groove; 212. Opening Groove; 213. Recess; 214. Scraper; 215. Vibration Module; 2151. Flexible Pad; 2152. Elastic Component; 300. Drive Shaft; 301. Bracket; 302. Long Strip Frame; 303. Arc-shaped Grid Frame; 400. Outlet Cylinder; 401. Bearing Seat; 402. Guide Rod; 403. Spring; 404. Circular Grid Frame; 405. Support Arm; 406. Bearing Sleeve; 407. Protrusion; 408. Spiral Groove; 500. Welding Part Body; 600. Welding Fixture. Detailed Implementation

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0044] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0045] Example, refer to Figure 1A protective device for the front side of a laser weld seam on titanium alloy includes a base 100, a protective shell 200, a weldment body 500, and a welding fixture 600.

[0046] The protective shell 200 is placed on the upper surface of the base 100, and the weldment body 500 is located between the base 100 and the protective shell 200. A back protection seat 101 is installed on the surface of the base 100. The back protection seat 101 contains a mesh that is the same as the arc-shaped mesh frame 303 and the circular mesh frame 404. The back protection seat 101 can intercept and treat some of the residual smoke on the back of the weldment body 500. A welding clamp 600 is installed at the edge of the upper surface of the base 100. The welding clamp 600 is used to limit the position of the weldment body 500 and ensure the stability of the weldment body 500 when laser welding is performed.

[0047] Reference Figure 2 , 3 5 and 8, the upper surface of the protective housing 200 has an upper laser welding groove 201, and the lower surface of the protective housing 200 has a lower laser welding groove 202, so that the laser can irradiate the welding position. A pair of positioning seats 210 are provided at the inner corner of the protective housing 200. The positioning seats 210 have a semi-circular groove 211, and the outer periphery of the positioning seats 210 has an opening groove 212, which is used to introduce the smoke to the position of the treatment mechanism. The inner edge of the semi-circular groove 211 has a groove 213, and the groove 213 has a groove 213. A scraper 214 is installed in the 13, which is used to scrape off impurities on the surface of the arc-shaped grid frame 303. A shaking module 215 is provided on the inner edge of the protective shell 200. The shaking module 215 includes a flexible pad 2151 and an elastic element 2152. The flexible pad 2151 is hinged to the inner edge of the protective shell 200, and the elastic element 2152 is provided on the back of the flexible pad 2151. When the bracket 301 rotates, it will collide with the flexible pad 2151, which can help shake off the impurities on the arc-shaped grid frame 303.

[0048] Reference Figure 5 and 7 The semi-arc groove 211 is equipped with a treatment mechanism, which is used to intercept and block impurities in the fume. The treatment mechanism includes a drive shaft 300, a bracket 301, a long frame 302, and an arc-shaped mesh frame 303. The drive shaft 300 rotates within the protective housing 200, and the axis of the drive shaft 300 coincides with the axis of the semi-arc groove 211. Multiple brackets 301 are installed on the outer periphery of the drive shaft 300. A long frame 302 is installed at the end of each bracket 301 away from the drive shaft 300, and an arc-shaped mesh frame 303 is installed between the multiple long frames 302. The arc-shaped mesh frame 303 is used to purify the fume generated during welding.

[0049] Reference Figure 3 ,4 7. A discharge tube 400 is mounted on the surface of the protective shell 200. The discharge tube 400 is connected to an external fan. An adjustment mechanism is provided in the discharge tube 400. The adjustment mechanism includes a support base 401, a guide rod 402, and a circular grid frame 404. The support base 401 is located on the inner edge of the discharge tube 400. The discharge tube 400 and the elongated frame 302 are hinged. The circular grid frame 404 moves telescopically along the inner edge of the discharge tube 400 and can be used for secondary purification. When its position changes, it can be linked to the arc-shaped grid frame 303 to change position. The support base 401 has a telescopically moving guide rod 402. One end of the guide rod 402 extending out of the support base 401 is connected to the edge of the circular grid frame 404. The other end of the guide rod 402 extending into the support base 401 is fixedly connected to... Spring 403, the other end of spring 403 is connected to the inner edge of bearing seat 401. When the arc-shaped grid frame 303 is normally ventilated, the circular grid frame 404 can return to its initial state under the action of spring 403. The inner edge of the circular grid frame 404 is provided with a protrusion 407. The surface of the drive shaft 300 is provided with a spiral groove 408. The protrusion 407 is located in the spiral groove 408. When the position of the protrusion 407 changes with the circular grid frame 404, the drive shaft 300 can be rotated through the spiral groove 408. The inner edge of bearing seat 401 is provided with a support arm 405. The end of the support arm 405 away from bearing seat 401 is equipped with a bearing sleeve 406. One end of the drive shaft 300 is rotatably connected to the bearing sleeve 406 to ensure stable rotation of the drive shaft 300.

[0050] A method for protecting the front side of a laser weld seam on titanium alloys involves first placing the workpiece body 500 on the base 100 and aligning the protective shell 200 onto the workpiece body 500. The upper laser welding groove 201 and lower laser welding groove 202 are then aligned with the welding positions on the workpiece body 500. A welding fixture 600 is used to constrain the position of the workpiece body 500. To accelerate the cooling rate of the workpiece body 500, the welding fixture 600 is made of copper. Before welding, the protective gas is connected to the protective shell 200 via an external gas supply pipe connected to the outlet cylinder 400. Welding then begins. One to two minutes before welding, shielding gas is introduced. Argon gas is supplied to the protective shell 200 at a flow rate of 18L / min-25L / min, depending on the actual welding situation. The argon gas overflows evenly into the protective shell 200 through the arc-shaped mesh frame 303, expelling the original air inside. The back protective seat 101 can also be connected to a gas pipe, with a shielding gas flow rate of 15L / min. The laser irradiates the welding area of ​​the workpiece body 500 located in the lower laser welding tank 202 from the upper laser welding tank 201, and welding is performed from one point to another along the upper laser welding tank 201. After welding is completed, the guide... When the outlet tube 400 is replaced with an external fan, the welding fumes from the weldment body 500 will enter the arc-shaped mesh frame 303 under the influence of suction. The arc-shaped mesh frame 303 will intercept impurities in the welding fumes, and the initially purified gas will pass through the circular mesh frame 404 and be discharged from the outlet tube 400. Furthermore, as more impurities are gradually adsorbed on the outer edge of the arc-shaped mesh frame 303, the suction will directly act on the circular mesh frame 404 to change its position. When the circular mesh frame 404 changes position, it drives the drive shaft through the protrusion 407 and the spiral groove 408. The drive shaft 300 rotates, and the arc-shaped mesh frame 303 rotates through the bracket 301. At this time, several other arc-shaped mesh frames 303 are facing the welding position. Finally, the arc-shaped mesh frame 303 with more externally adsorbed impurities will rotate to the position of the scraper 214, and the scraper 214 will scrape it off. At the same time, the bracket 301 will collide with the flexible pad 2151 when rotating, which can help the impurities on the arc-shaped mesh frame 303 fall off. During normal ventilation, under the action of the spring 403, the circular mesh frame 404 and the drive shaft 300 can be linked to perform a reset operation.

[0051] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A protective device for the front side of laser weld seams in titanium alloys, characterized in that: Includes a base (100), a protective shell (200), a weldment body (500), and a welding fixture (600); The protective shell (200) is placed on the upper surface of the base (100), and the weldment body (500) is located between the base (100) and the protective shell (200); A back protection seat (101) is provided on the surface of the base (100); The upper surface of the protective shell (200) is provided with an upper laser welding groove (201), the lower surface of the protective shell (200) is provided with a lower laser welding groove (202), a pair of positioning seats (210) are provided at the inner corner of the protective shell (200), a semi-circular groove (211) is provided in the positioning seat (210), an opening groove (212) is provided on the outer periphery of the positioning seat (210), and a treatment mechanism is arranged in the semi-circular groove (211); The protective shell (200) is provided with a discharge tube (400) on its surface. The discharge tube (400) is connected to an external fan. An adjustment mechanism is provided in the discharge tube (400). The inner edge of the semi-arc groove (211) is provided with a groove (213), and a scraper (214) is installed in the groove (213). The inner edge of the protective shell (200) is provided with a shaking module (215). The shaking module (215) includes a flexible pad (2151) and an elastic element (2152). The flexible pad (2151) is hinged to the inner edge of the protective shell (200), and the elastic element (2152) is provided on the back of the flexible pad (2151). The treatment mechanism includes a drive shaft (300), a bracket (301), a long frame (302), and an arc-shaped grid frame (303). The drive shaft (300) rotates within the protective housing (200). The axis of the drive shaft (300) coincides with the axis of the semi-arc groove (211). Multiple brackets (301) are installed on the outer periphery of the drive shaft (300). The adjustment mechanism includes a support base (401), a guide rod (402), and a circular grid frame (404). The support base (401) is located on the inner edge of the outlet cylinder (400). The outlet cylinder (400) and the elongated frame (302) are all hinged. The circular grid frame (404) moves telescopically along the inner edge of the outlet cylinder (400). The support seat (401) has a telescopic guide rod (402). One end of the guide rod (402) extending out of the support seat (401) is connected to the edge of the circular grid frame (404). One end of the guide rod (402) extending into the support seat (401) is fixedly connected to a spring (403). The other end of the spring (403) is connected to the inner edge of the support seat (401). The inner edge of the circular grid frame (404) is provided with a protrusion (407), and the surface of the drive shaft (300) is provided with a spiral groove (408), and the protrusion (407) is located in the spiral groove (408).

2. The protective device for the front side of laser weld seams in titanium alloys according to claim 1, characterized in that: A welding fixture (600) is installed at the edge of the upper surface of the base (100), wherein the welding fixture (600) is used to position the weldment body (500).

3. The protective device for the front side of laser weld seams in titanium alloys according to claim 1, characterized in that: Each of the multiple brackets (301) has a long frame (302) installed at one end away from the drive shaft (300), and an arc-shaped grid frame (303) is installed between the multiple long frames (302).

4. The protective device for the front side of laser weld seams in titanium alloys according to claim 1, characterized in that: The inner edge of the bearing seat (401) is provided with a support arm (405), and a bearing sleeve (406) is installed at the end of the support arm (405) away from the bearing seat (401), and one end of the transmission shaft (300) is rotatably connected to the bearing sleeve (406).

5. A method for protecting the front side of a laser-welded titanium alloy weld, implemented based on the device for protecting the front side of a laser-welded titanium alloy weld as described in any one of claims 1-4, characterized in that: Includes the following steps: S1. Place the workpiece body (500) on the base (100), and align the protective shell (200) onto the workpiece body (500). Align the upper laser welding groove (201) and the lower laser welding groove (202) with the welding positions of the workpiece body (500), and limit the position of the workpiece body (500) using the welding fixture (600). S2. Connect an external fan to the outlet tube (400) and run the fan while welding. At this time, the welding fumes of the workpiece body (500) will enter the arc-shaped grid frame (303) under the action of the attraction. The arc-shaped grid frame (303) will intercept the impurities in the welding fumes. The gas after preliminary purification passes through the circular grid frame (404) and is discharged from the position of the outlet tube (400). S3. When more impurities are gradually adsorbed on the outer edge of the arc-shaped mesh frame (303), the suction force will directly act on the circular mesh frame (404) to change position. When the circular mesh frame (404) moves, it drives the drive shaft (300) to rotate through the protrusion (407) and the spiral groove (408). The drive shaft (300) drives the arc-shaped mesh frame (303) to rotate through the bracket (301). At this moment, several other arc-shaped mesh frames (303) are facing the welding position. S4. At this moment, the arc-shaped grid frame (303) with more external adsorption of impurities will rotate to the position of the scraper (214) and the scraper (214) will scrape it off. At the same time, the bracket (301) will collide with the flexible pad (2151) when rotating. At this moment, it can help the impurities on the arc-shaped grid frame (303) to fall off. During normal ventilation, under the action of the spring (403), the circular grid frame (404) and the drive shaft (300) can be linked to reset.

Images