A large-format air cap assembly, a gas welding jig and a welding method

Abstract

The application discloses a large-breadth air nozzle assembly, a blowing welding jig and a welding method. The large-breadth air nozzle assembly comprises an air nozzle bottom plate and an air nozzle cover plate, a large-breadth air cavity and a large-breadth blowing seam are arranged between the air nozzle bottom plate and the air nozzle cover plate, the large-breadth blowing seam is arranged obliquely, the large-breadth blowing seam is arranged in communication with the large-breadth air cavity, and an air inlet channel in communication with the large-breadth air cavity is further arranged on the air nozzle cover plate and / or the air nozzle bottom plate. The large-breadth air nozzle assembly can form a large-area one-way and relatively concentrated blowing effect through the arrangement of the large-breadth air cavity and the large-breadth blowing seam, can uniformly blow air to a certain long and narrow area in a directional manner, forms a stable and continuous gas protection area within a certain range, effectively controls welding defects caused by thermal deformation, guarantees the air tightness and stability after welding, improves the welding seam quality and aesthetic degree, and further greatly improves the production efficiency and product yield.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding gas protection, in particular to a large-format air nozzle assembly, a gas blowing welding jig and a welding method. BACKGROUND

[0002] Fuel cell technology is a new power generation technology after the original power generation technology, and is also a pollution-free, high-efficiency, noiseless and continuous working power device. A bipolar plate is provided in the fuel cell, which separates the membrane electrode assembly and forms a cooling channel. The bipolar plate is formed by welding a cathode plate body and an anode plate body, the welding process is long, and the bipolar plate itself is very thin, the thickness of the processed bipolar plate is only a few millimeters, and any unstable factor in the processing process can cause the yield to decrease.

[0003] In the process of laser welding the bipolar plate, protective gas is usually introduced to assist welding and improve yield. On the one hand, the introduction of protective gas can blow away the air around, prevent chemical reaction of the weld with nitrogen, oxygen and other contaminant gases, and effectively protect the molten pool and the high-temperature area nearby; on the other hand, the protective gas can blow away and control the plasma, making the energy input of the welding process more stable.

[0004] In the prior art, there are two common gas nozzle setting methods. One is to set the gas nozzle at intervals along the welding direction, and the point is relatively fixed. This setting method can cause uneven distribution of protective gas, limited coverage, and poor overall flexibility. The other is to set the gas nozzle on the laser welding gun, and introduce protective gas along with the welding process, which enhances the follow-up performance, but increases the load of the laser welding gun, and still only blows gas in a local range, which has great instability and limitation in industrial applications. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art, and to provide a large-format air nozzle assembly, a gas blowing welding jig and a welding method.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] A large-format air nozzle assembly, comprising an air nozzle bottom plate and an air nozzle cover plate installed on the air nozzle bottom plate, a large-format air cavity is provided between the air nozzle bottom plate and the air nozzle cover plate, at least one side surface between the air nozzle bottom plate and the air nozzle cover plate is provided with a large-format gas blowing slot, the large-format gas blowing slot is arranged obliquely, the large-format gas blowing slot is provided in communication with the large-format air cavity, and the air nozzle cover plate and / or the air nozzle bottom plate is / are further provided with an air inlet channel in communication with the large-format air cavity.

[0008] The large-area air nozzle assembly can form a large-area one-way and relatively concentrated blowing effect through the arrangement of the large-area air cavity and the large-area blowing slot, can uniformly blow air to a certain long and narrow area in a directional manner, form a stable and continuous gas protection area within a certain range, and improve the welding quality and product yield. Moreover, the large-area air nozzle assembly has a relatively simple structure, is easy to manufacture and use, is convenient to install and disassemble, can be set to multiple sizes according to the size and path length of the actual weld, has high installation flexibility and small limitation, and is suitable for wide promotion in the industrial field.

[0009] The arrangement of the large-area air cavity can receive and store a certain amount of gas, play a role in transitioning and adjusting the gas, make the gas uniformly dispersed in the air cavity, and make a large amount of gas as uniformly as possible blow out from the large-area blowing slot. On the other hand, the large-area air cavity facilitates air intake, avoids increasing the connection difficulty by directly connecting the air intake channel with the large-area blowing slot, and reduces the blowing corners of the large-area blowing slot.

[0010] The arrangement of the large-area blowing slot can not only form a long-distance line blowing effect, but also make the gas more directional. The gap of the large-area blowing slot is small, and the airflow blown out at each position can be accelerated, and the airflow pressure will also change. Compared with the traditional hole-type air nozzle, the blowing formed in this way not only increases the blowing area, but also has better continuity than the hole-type air nozzle arranged in multiple arrays, and there is no breakpoint in the area, and the mutual interference between multiple airflows is also avoided.

[0011] Further, the gap of the large-area blowing slot near the large-area air cavity is larger than the gap of the large-area blowing slot near the air outlet.

[0012] The size of the gap near the air outlet is not more than 0.5 mm, and is preferably about 0.2 mm.

[0013] Further, the large-area air cavity and the large-area blowing slot are arranged along the length direction of the air nozzle bottom plate, and the length direction size of the large-area blowing slot is not less than the length direction size of the large-area air cavity.

[0014] Further, the air nozzle bottom plate includes a bottom plate plane and a bottom plate inclined surface, the large-area groove is arranged on the bottom plate plane, and the large-area groove extends to the bottom plate inclined surface; the air nozzle cover plate includes a cover plate bottom surface and a cover plate bottom inclined surface, the cover plate bottom surface is connected and installed on the bottom plate plane to make the large-area groove form the large-area air cavity; the two sides of the bottom plate inclined surface are respectively provided with sealing support strips, and the cover plate bottom inclined surface abuts on the sealing support strips to make the area between the pair of sealing support strips form the large-area blowing slot.

[0015] With this arrangement, after the nozzle cover and the nozzle base plate are closed, the large-format air chamber and the large-format air blowing slot are naturally formed. The bottom surface of the cover plate tightly covers the plane of the base plate, forming a sealing structure in three directions. The inclined surface of the cover plate is parallel to the inclined surface of the base plate. Due to the setting of the sealing support strip, a gap can be formed between the two, and this gap can form the large-format air blowing slot. The sealing support strip not only supports the gap surface but also forms a seal at both ends, preventing gas from being blown out from both sides of the large-format air blowing slot and avoiding overflow.

[0016] An air-blowing welding fixture with large-format nozzle assemblies is provided. The air-blowing welding fixture includes a fixture base plate and a fixture cover plate disposed on the fixture base plate. The fixture cover plate is provided with a welding path groove. A plurality of the large-format nozzle assemblies are arranged in segments along one side of the welding path groove on the fixture cover plate. The air outlets of the large-format air-blowing seams are respectively directed toward the welding path groove at their respective positions.

[0017] This air-blowing welding fixture, by arranging the large-format nozzle assembly along the welding path on the fixture cover plate, can form a large-format, continuous, and uniform air-blowing effect at each section of the welding path groove. The blown gas can remain in the welding path groove to form a gas protection zone, which is conducive to the smooth progress of precision laser welding and provides better conditions for improving welding quality. By arranging the nozzles in this way, it can ensure all-round air-blowing protection without blind spots, and it can also simplify the welding torch structure, avoiding the need to set up moving nozzles on the welding torch. Compared with the nozzles (ducts) that move with the welding torch, this air-blowing protection method has a more stable and comprehensive protection range, and can also improve the movement flexibility of the welding torch, with a smaller load on the welding torch.

[0018] The air-blowing protection formed by the large-format air-blowing seam can effectively control welding defects caused by thermal deformation, reduce the deformation of bipolar plates, ensure the airtightness after welding, improve weld quality, protect the weld from oxidation and blackening, and make the weld look beautiful. It can also significantly improve production efficiency.

[0019] Furthermore, the fixture cover plate is provided with several recessed spaces with "V" shaped cross sections. The bottom of the recessed space is provided with the welding path groove. The side of the recessed space is provided with a stepped structure. The nozzle base plate of the large-format nozzle assembly is installed at the stepped structure so that the large-format air blowing seam is arranged towards the welding path groove.

[0020] The recessed space is designed to facilitate welding by setting up welding paths and weld seams, and also to create a space for gas containment, allowing the blown airflow to briefly linger in this area for better gas protection. In addition, the "V" shaped cross-section also guides the airflow.

[0021] Furthermore, the slope angle of the sunken space is 45-50°, the slope angle of the large-format air slit is also 45-50°, and the two ends of the sunken space are respectively provided with arc-shaped entry and exit spaces.

[0022] Furthermore, a fixture mounting plate is provided below the fixture base plate, and a plurality of pressure block tensioning assemblies are provided on the fixture mounting plate. The pressure block tensioning assemblies are connected to and support the fixture base plate and the fixture cover plate. The pressure block tensioning assembly includes a rotary tensioning cylinder, the output end of which is connected to a pull rod. A plurality of rotary transition support blocks are sleeved on the pull rod, and the end of the pull rod is provided with a limiting end. The rotary transition support blocks support the fixture base plate, and the pull rod passes through the fixture base plate and the fixture cover plate and is connected to the limiting groove on the fixture cover plate.

[0023] The material to be welded can be placed between the base plate of the fixture and the cover plate of the fixture. The clamping block assembly can both support the base plate of the fixture and loosen or tighten the cover plate of the fixture, so that the cover plate of the fixture and the base plate of the fixture can hold the material.

[0024] Furthermore, the fixture cover plate is also provided with a protective airflow confluence assembly, and the air pipes connected to the large-format air blowing assembly are respectively connected to the protective airflow confluence assembly.

[0025] A welding method for an air-blowing welding fixture with a large-format air nozzle assembly includes the following steps: opening the pressure block tensioning assembly, lifting the fixture cover plate, placing the material to be welded on the fixture base plate, installing the fixture cover plate, locking the pressure block tensioning assembly, and starting welding; during the welding process, the large-format air-blowing seam continuously blows air into the welding path groove.

[0026] Compared with the prior art, the beneficial effects of the present invention are: 1. The large-format air nozzle assembly, through the setting of the large-format air chamber and the large-format air blowing seam, can form a large-area unidirectional and relatively concentrated air blowing effect, and can blow air evenly in a specific narrow area, forming a stable and continuous gas protection area within a certain range, thereby improving welding quality and product yield; 2. The structure of the large-format air nozzle assembly is relatively simple, easy to manufacture and use, and easy to install and disassemble. It can be set into various sizes according to the actual weld size and path length, with high installation flexibility and few limitations, making it suitable for widespread promotion in the industrial field; 3. The setting of the large-format air chamber facilitates air intake, can receive and store a certain amount of gas, and plays a role in transitioning and regulating the gas, allowing the gas to... The gas is evenly dispersed within the air cavity, allowing a large amount of gas to be blown out as evenly as possible from the large-format air-blowing slit; 4. The large-format air-blowing slit not only creates a long-distance, line-by-line blowing effect but also makes the gas more directional; the continuity of this large-format nozzle assembly is better, with no breaks in the area, and it also avoids mutual interference between multiple airflows; 5. This air-blowing welding fixture can not only hold the material to be welded but also, by arranging the large-format nozzle assembly at the welding path on the fixture cover plate, can create a large-format, continuous, and uniform blowing effect at each section of the welding path groove. The blown gas can stay at the welding path groove to form a gas protection area, which is conducive to the smooth progress of precision laser welding and provides better conditions for improving welding quality. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a large-format air nozzle assembly according to the present invention;

[0028] Figure 2 This is an exploded structural diagram of a large-format air nozzle assembly according to the present invention;

[0029] Figure 3 This is a schematic cross-sectional view of a large-format air nozzle assembly according to the present invention;

[0030] Figure 4 This is a schematic diagram of the overall structure of the air-blowing welding fixture of the present invention;

[0031] Figure 5 This is a partially enlarged structural diagram of the air blowing part of the air blowing welding fixture of the present invention;

[0032] Figure 6 This is a schematic diagram of the overall structure of the pressure block tensioning assembly on the air-blowing welding fixture of the present invention;

[0033] Figure 7 This is a schematic diagram of the bottom structure of the air-blowing welding fixture of the present invention;

[0034] Figure 8This is a partial structural diagram of the tie rod connection of the air-blowing welding fixture of the present invention;

[0035] In the diagram: 1. Nozzle base plate; 101. Base plate plane; 102. Base plate slope; 2. Nozzle cover plate; 201. Cover plate bottom surface; 202. Cover plate bottom slope; 3. Large-format air chamber; 4. Large-format air blowing seam; 5. Air inlet channel; 6. Sealing support strip; 7. Fixture base plate; 8. Fixture cover plate; 9. Welding path groove; 10. Recessed space; 1001. Step structure; 11. Fixture mounting plate; 12. Pressure block tensioning assembly; 1201. Rotary tensioning cylinder; 1202. Pull rod; 1203. Rotary transition support block; 1204. Limiting end; 13. Limiting groove; 14. Protective airflow confluence assembly. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] like Figures 1-3 As shown, a large-format air nozzle assembly includes an air nozzle base plate 1 and an air nozzle cover plate 2 mounted on the air nozzle base plate 1. A large-format air cavity 3 is provided between the air nozzle base plate 1 and the air nozzle cover plate 2. A large-format air blowing slit 4 is provided on one side between the air nozzle base plate 1 and the air nozzle cover plate 2. The large-format air blowing slit 4 is arranged obliquely and is connected to the large-format air cavity 3. An air inlet channel 5 communicating with the large-format air cavity 3 is also provided on the air nozzle cover plate 2 and / or the air nozzle base plate 1.

[0039] This large-format air nozzle assembly, through the arrangement of the large-format air chamber 3 and the large-format air blowing seam 4, can form a large-area unidirectional and relatively concentrated air blowing effect. It can blow air evenly and directionally into a narrow area, forming a stable and continuous gas protection zone within a certain range, thereby improving welding quality and product yield. Moreover, this large-format air nozzle assembly has a relatively simple structure, is easy to manufacture and use, and is also convenient to install and disassemble. It can be set into various sizes according to the actual weld size and path length, with high installation flexibility and few limitations, making it suitable for widespread promotion in the industrial field.

[0040] The large-format air chamber 3 serves two purposes: firstly, it can receive and store a certain amount of gas, acting as a transition and regulating agent for the gas, allowing the gas to be evenly dispersed within the air chamber, so that a large amount of gas can be blown out from the large-format air slit as evenly as possible; secondly, the large-format air chamber 3 facilitates air intake, avoiding direct connection between the air intake channel and the large-format air slit, thus reducing the difficulty of connection and minimizing the air blowing at the four corners of the large-format air slit.

[0041] The large-format air-blowing slit 4 not only creates a long-distance, line-based air-blowing effect but also enhances the directionality of the gas. The small gaps in the large-format air-blowing slit 4 also accelerate the airflow at each location, altering the airflow pressure. Compared to traditional perforated nozzles, this method of airflow not only increases the blowing area but also provides better continuity than multiple arrayed perforated nozzles, eliminating discontinuities within the area and preventing interference between multiple airflow streams.

[0042] This large-format air nozzle assembly adopts a split structure, that is, it is formed by assembling the air nozzle cover plate 2 and the air nozzle base plate 1. This method makes it easier to process the large-format air chamber 3 and the large-format air blowing slot 4, reducing the difficulty of manufacturing the chamber and slot. The two are positioned and connected by positioning pins and then fastened by bolts. The air inlet channel 5 can be set with one or more depending on the length of the large-format air nozzle assembly. The air inlet channel 5 can be connected to the air pipe connector and the air inlet pipe.

[0043] Furthermore, the gap of the large-format air-blowing slit 4 on the side near the large-format air chamber 3 is larger than the gap of the large-format air-blowing slit on the side near the air outlet.

[0044] The gap of the large-format air-blowing slit 4 can be gradually reduced from the large-format air cavity 3 outwards. This arrangement can change the state of the airflow, making the airflow more concentrated in a line and more targeted, which is beneficial for precision laser welding.

[0045] In some embodiments, the size of the slit near the air outlet is no more than 0.5 mm, preferably around 0.2 mm.

[0046] Furthermore, both the large-format air cavity 3 and the large-format air slit 4 are arranged along the length direction of the nozzle base plate 1, and the length dimension of the large-format air slit 4 is not less than the length dimension of the large-format air cavity 3. The large-format air slit 4 can form a long-distance linear air blowing effect.

[0047] Furthermore, the nozzle base plate 1 includes a base plate plane 101 and a base plate inclined surface 102. A large-format groove is provided on the base plate plane 101, extending towards the base plate inclined surface. The nozzle cover plate 2 includes a cover plate bottom surface 201 and a cover plate bottom inclined surface 202. The cover plate bottom surface 201 is connected and installed on the base plate plane 101 so that the large-format groove forms the large-format air cavity 3. Sealing support strips 6 are provided on both sides of the base plate inclined surface 102, and the cover plate bottom inclined surface 202 abuts against the sealing support strips 6 so that the area between a pair of sealing support strips 6 forms the large-format air slit 4. The nozzle base plate 1 and the nozzle cover plate 2 together form a downwardly inclined portion.

[0048] With this arrangement, after the nozzle cover plate 2 and the nozzle base plate 1 are closed, the large-format air chamber 3 and the large-format air blowing slot 4 can be naturally formed. The bottom surface 201 of the cover plate tightly covers the plane 101 of the base plate, forming a sealing structure in three directions. The bottom inclined surface 202 of the cover plate is parallel to the inclined surface 102 of the base plate. Due to the setting of the sealing support strip 6, a gap can be formed between the two, and this gap can form the large-format air blowing slot. The sealing support strip 6 not only supports the gap surface but also forms a seal at both ends, preventing gas from being blown out from both sides of the large-format air blowing slot 4 and preventing overflow.

[0049] The large-format groove smoothly transitions to the inclined surface of the base plate, which facilitates downward airflow. In some embodiments, the large-format groove may also be located on the bottom surface of the cover plate. The inclined surface of the base plate 102 and / or the inclined surface of the bottom of the cover plate 202 are also provided with a sealing groove to accommodate the sealing support strip 6.

[0050] like Figure 4 As shown, an air-blowing welding fixture with large-format nozzle assemblies is disclosed. The air-blowing welding fixture includes a fixture base plate 7 and a fixture cover plate 8 disposed on the fixture base plate 7. The fixture cover plate 8 is provided with a welding path groove 9. Several large-format nozzle assemblies are arranged in segments along one side of the welding path groove 9 on the fixture cover plate 8. The air outlets of the large-format air-blowing seams 4 are respectively directed toward the welding path groove 9 at their respective positions.

[0051] This air-blowing welding fixture, by arranging the large-format air nozzle assembly along the welding path on the fixture cover plate 8, can form a large-format, continuous, and uniform air-blowing effect at each section of the welding path groove 9. The blown gas can remain in the welding path groove 9 to form a gas protection zone, which is conducive to the smooth progress of precision laser welding and provides better conditions for improving welding quality. By arranging the air nozzles in this way, it is possible to ensure all-round air-blowing protection without blind spots, and it can also simplify the welding torch structure, avoiding the need to set up moving air nozzles on the welding torch. Compared with air nozzles (air ducts) that move with the welding torch, this air-blowing protection method has a more stable and comprehensive protection range, and can also improve the movement flexibility of the welding torch, with a smaller load on the welding torch.

[0052] Furthermore, in combination Figure 5 As shown, the fixture cover plate 8 is provided with several recessed spaces 10 with "V" shaped cross sections. The bottom of the recessed space 10 is provided with the welding path groove 9. The side of the recessed space 10 is provided with a stepped structure 1001. The nozzle base plate 1 of the large-format nozzle assembly is installed at the stepped structure 1001 so that the large-format air blowing seam 4 is arranged facing the welding path groove 9.

[0053] The recessed space 10 is designed to facilitate welding by setting up welding paths and welds, and also to create a space for gas containment, allowing the blown airflow to briefly stay in this area for better gas protection. In addition, the "V" shaped cross-section also guides the airflow, and the airflow can be bounced off the sloping surface opposite the air outlet.

[0054] The “V” shaped cross-section facilitates the movement of the welding torch, provides space for the torch head, and allows for the installation of the nozzle assembly using the inclined surface and the stepped structure 1001, forming a limiting and connecting installation structure for the nozzle base plate.

[0055] Furthermore, the slope angle of the sunken space 10 is about 42°, and the slope angle of the large-format air-blowing slit 4 is also about 42°. The slopes of the two are basically the same, which facilitates fitting. The sunken space 10 has arc-shaped entry and exit spaces at both ends to facilitate the entry and exit of the gun head.

[0056] Furthermore, in combination Figures 6-8As shown, a fixture mounting plate 11 is also provided below the fixture base plate 7. The fixture mounting plate 11 is provided with a plurality of pressure block tensioning assemblies 12. The pressure block tensioning assemblies 12 are connected to and support the fixture base plate 7 and the fixture cover plate 8. The pressure block tensioning assembly 12 includes a rotary tensioning cylinder 1201. The output end of the rotary tensioning cylinder 1201 is connected to a pull rod 1202. A plurality of rotary transition support blocks 1203 are sleeved on the pull rod 1202. The end of the pull rod 1202 is provided with a limiting end 1204. The rotary transition support block 1203 supports the fixture base plate 7. The pull rod 1202 passes through the fixture base plate 7 and the fixture cover plate 8 and is connected to the limiting groove 13 on the fixture cover plate 8.

[0057] The material to be welded can be placed between the fixture base plate 7 and the fixture cover plate 8. The clamping block tensioning assembly 12 can both support the fixture base plate and loosen the fixture cover plate, so that the fixture cover plate and the fixture base plate can hold the material.

[0058] The clamping assembly 12 can effectively support the fixture base plate using the rotating adapter support block 1203. The bottom of the fixture base plate 7 is provided with a groove that matches it. The pull rod 1202 can pass through the fixture base plate 7 and the fixture cover plate 8. It is connected to the limiting end 1204 on the pull rod using the limiting groove 13 on the fixture cover plate. The pull rod 1202 can rotate, thereby changing the angle of the limiting end 1204. Combined with its downward pulling action, a locking structure can be formed.

[0059] In some embodiments, the limiting groove 13 is an oval hole with a limiting step structure inside, and the limiting end 1204 is a limiting strip structure. After being inserted from below, it can be rotated to engage with the limiting step structure.

[0060] Furthermore, the fixture cover plate 8 is also provided with a protective airflow confluence assembly 14. The air pipes connected to the large-format blowing assembly are respectively connected to the protective airflow confluence assembly 14, which facilitates the connection to an external air source and can also play a role in gas distribution, making it convenient for overall airflow control.

[0061] A welding method for an air-blowing welding fixture with a large-format air nozzle assembly includes the following steps: opening the pressure block tensioning assembly 12, lifting the fixture cover plate 8, placing the material to be welded on the fixture base plate 7, installing the fixture cover plate 8, locking the pressure block tensioning assembly 12, and starting welding; during the welding process, the large-format air-blowing seam 4 continuously blows air into the welding path groove 9. When the welding torch moves into a welding path groove, the large-format air-blowing seam in that welding path groove opens for air blowing. When the welding torch leaves, the air blowing can be stopped, and then the next section of air blowing protection can begin. The air blowing protection on each path section does not interfere with each other.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blower welding fixture with a large-format nozzle assembly, characterized in that, A large-format air nozzle assembly includes an air nozzle base plate and an air nozzle cover plate mounted on the air nozzle base plate. A large-format air cavity is provided between the air nozzle base plate and the air nozzle cover plate. At least one side of the air nozzle base plate and the air nozzle cover plate has a large-format air blowing slot, which is obliquely arranged and communicates with the large-format air cavity. The air nozzle cover plate and / or the air nozzle base plate also have an air inlet channel communicating with the large-format air cavity. The gap of the large-format air blowing slot on the side near the large-format air cavity is larger than the gap on the side near the air outlet. The large-format air cavity and the large-format air blowing slot... All are arranged along the length direction of the nozzle base plate, and the length dimension of the large-format air blowing slot is not less than the length dimension of the large-format air cavity; the nozzle base plate includes a base plate plane and a base plate slope, and a large-format groove is provided on the base plate plane, which extends towards the base plate slope; the nozzle cover plate includes a cover plate bottom surface and a cover plate bottom slope, and the cover plate bottom surface is connected and installed on the base plate plane so that the large-format groove forms the large-format air cavity; sealing support strips are provided on both sides of the base plate slope, and the cover plate bottom slope abuts against the sealing support strips so that the area between a pair of sealing support strips forms the large-format air blowing slot; The air-blowing welding fixture includes a fixture base plate and a fixture cover plate disposed on the fixture base plate. The fixture cover plate is provided with a welding path groove. Several large-format air nozzle assemblies are arranged in segments along one side of the welding path groove on the fixture cover plate. The air outlets of the large-format air-blowing seams are respectively directed towards the welding path groove at their respective positions. Several "V"-shaped recessed spaces are arranged on the fixture cover plate. The bottom of the recessed space is provided with the welding path groove. The side of the recessed space is provided with a stepped structure. The air nozzle base plate of the large-format air nozzle assembly is installed at the stepped structure so that the large-format air-blowing seam is directed towards the welding path groove.

2. The air-blowing welding fixture for the large-format air nozzle assembly according to claim 1, characterized in that, The slope angle of the sunken space is 45-50°, and the slope angle of the large-format air slit is also 45-50°. The two ends of the sunken space are respectively provided with arc-shaped entry and exit spaces.

3. The air-blowing welding fixture for the large-format air nozzle assembly according to claim 1, characterized in that, Below the fixture base plate, there is a fixture mounting plate. The fixture mounting plate is provided with several pressure block tensioning assemblies. The pressure block tensioning assemblies are connected to and support the fixture base plate and the fixture cover plate. The pressure block tensioning assembly includes a rotary tensioning cylinder. The output end of the rotary tensioning cylinder is connected to a pull rod. The pull rod is fitted with multiple rotary transition support blocks. The end of the pull rod is provided with a limiting end. The rotary transition support blocks support the fixture base plate. The pull rod passes through the fixture base plate and the fixture cover plate and is connected to the limiting groove on the fixture cover plate.

4. The air-blowing welding fixture for the large-format air nozzle assembly according to claim 1, characterized in that, The fixture cover plate is also provided with a protective airflow confluence assembly, and the air pipes connected to the large-format air nozzle assembly are respectively connected to the protective airflow confluence assembly.

5. A welding method for a blower welding fixture having the large-format nozzle assembly as described in claim 3, characterized in that, The operation includes the following steps: opening the pressure block tensioning assembly, lifting the fixture cover plate, placing the material to be welded on the fixture base plate, installing the fixture cover plate, locking the pressure block tensioning assembly, and starting welding; during the welding process, the large-format air blowing seam continuously blows air into the welding path groove.

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