Welding carrier and welding device

Abstract

The utility model belongs to the technical field of brazing, and discloses a welding carrier and a welding device.The welding carrier comprises a carrier body and a positioning column, the carrier body comprises a carrier base plate, a first positioning groove is formed in the carrier base plate, and the first positioning groove is used for containing a silver point; one end of the positioning column is arranged on the carrier body, the other end of the positioning column is used for penetrating through a positioning hole in the metal composite plate, and the positioning column is attached to the hole wall of the positioning hole. According to the welding carrier provided by the utility model, the silver point is firstly placed in the first positioning groove in the carrier body, then the positioning column penetrates through the positioning hole of the metal composite plate, and the first groove bottom surface of the first positioning groove, the silver point and the metal composite plate are sequentially propped against one another, so that the positioning between the metal composite plate and the silver point is realized; and the welding precision of the metal composite plate and the silver point is effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of brazing, in particular to a welding carrier and a welding device. Background Art

[0002] Metal composite plates refer to plates made by welding two or more metal layers together through cold rolling, hot rolling, explosive bonding, explosive rolling, etc. For example, copper-aluminum composite plates composed of copper and aluminum layers not only retain the advantages of copper such as high conductivity, high strength, and high wear resistance, but also have the advantages of aluminum such as lightness, corrosion resistance, and thermal conductivity.

[0003] In the related art, the metal composite plate and the silver spots can be welded manually, but manual welding may cause local overheating of the metal composite plate, resulting in deformation of the metal composite plate, and the welding accuracy of the metal composite plate and the silver spots by manual welding is low. Utility Model Content

[0004] One purpose of the utility model is to provide a welding carrier to effectively ensure the welding accuracy of the metal composite plate and the silver point.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A welding carrier is provided for welding a metal composite plate and a silver spot, the welding carrier comprising:

[0007] The carrier body includes a carrier substrate, wherein the carrier substrate is provided with a first positioning groove, the first positioning groove is used to accommodate the silver dot, and the silver dot and the metal composite plate are sequentially arranged on the first groove bottom surface of the first positioning groove;

[0008] A positioning post, one end of which is provided on the carrier body, and the other end of which is used to penetrate a positioning hole on the metal composite plate, and the positioning post is in contact with the hole wall of the positioning hole.

[0009] Optionally, the carrier substrate is spaced apart from the metal composite plate.

[0010] Optionally, a second positioning groove is provided on the carrier substrate, the first positioning groove is provided on the second groove bottom surface of the second positioning groove, the positioning column extends into the second positioning groove, and the second positioning groove is used to accommodate the metal composite plate.

[0011] Optionally, a first bottom surface of the metal composite plate facing away from the second groove bottom surface of the second positioning groove is in the same plane as the carrier substrate;

[0012] Alternatively, a first bottom surface of the metal composite plate, which is away from the second groove bottom surface of the second positioning groove, protrudes from the carrier substrate.

[0013] Optionally, the second groove bottom surface of the second positioning groove is spaced apart from the metal composite plate.

[0014] Optionally, a stepped hole is provided on the carrier body, and the positioning column includes a large end and a small end connected to each other, the large end is passed through the large end of the stepped hole, and the small end is passed through the small end of the stepped hole.

[0015] Optionally, the carrier body is made of graphite.

[0016] Optionally, a counterweight block is embedded in the carrier body, and the density of the counterweight block is greater than the density of the carrier body.

[0017] Another object of the present invention is to provide a welding device to effectively prevent deformation of the metal composite plate.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] Provided is a welding device comprising a brazing furnace and any one of the above-mentioned welding carriers;

[0020] The brazing furnace comprises a brazing furnace body and a conveying mechanism;

[0021] The welding carrier is arranged on the conveying mechanism, and the conveying mechanism is used to convey the welding carrier into the brazing furnace body.

[0022] Optionally, the brazing furnace body is provided with an air inlet channel, and reducing gas can be introduced into the brazing furnace body through the air inlet channel.

[0023] Beneficial effects:

[0024] The welding carrier provided by the present invention first places the silver dot in the first positioning groove on the carrier body, then penetrates the positioning hole of the metal composite plate through the positioning column, and makes the first groove bottom surface of the first positioning groove, the silver dot and the metal composite plate abut against each other in sequence, so as to realize the positioning and assembly of the metal composite plate and the silver dot relative to the welding carrier, that is, the positioning between the metal composite plate and the silver dot is realized, and the welding accuracy of the metal composite plate and the silver dot is effectively guaranteed.

[0025] The welding device provided by the utility model transports the welding carrier equipped with the metal composite plate and the silver spot into the brazing furnace body for welding through the conveying mechanism. The metal composite plate is heated evenly in the brazing furnace body, effectively preventing the metal composite plate from being locally overheated, and further effectively preventing the metal composite plate from being deformed when being welded with the silver spot. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1This is an exploded view of the structure of the welding carrier provided by the utility model, which is equipped with a metal composite plate and silver points;

[0027] Figure 2 It is a cross-sectional view of a welding carrier provided by the present invention equipped with a metal composite plate and silver dots;

[0028] Figure 3 This is a schematic structural diagram of a welding carrier provided by the present invention, which is equipped with a metal composite plate and silver dots;

[0029] Figure 4 This is an exploded view of the structure of the assembly to be welded provided by the present invention;

[0030] Figure 5 This is a structural schematic diagram of the welding device provided by the utility model from one perspective;

[0031] Figure 6 This is a structural schematic diagram of the welding device provided by the utility model from another perspective.

[0032] In the picture:

[0033] 10. Metal composite plate; 11. Positioning hole; 12. First bottom surface; 13. First top surface; 20. Silver dot; 21. Second bottom surface; 22. Second top surface; 30. Solder sheet;

[0034] 100, carrier body; 101, carrier substrate; 110, first positioning groove; 111, bottom surface of first groove; 120, stepped hole; 130, second positioning groove; 131, bottom surface of second groove;

[0035] 200, positioning column; 210, large end; 220, small end;

[0036] 300, counterweight;

[0037] 410, brazing furnace body; 411, preheating zone; 412, heating zone; 413, cooling zone; 420, conveying mechanism;

[0038] 500, gas cylinder;

[0039] 600. Controller. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0041] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0044] Reference Figures 1 to 4 As shown, this embodiment provides a welding carrier, which is used for welding the metal composite plate 10 and the silver point 20.

[0045] Specifically, the metal composite plate 10 is provided with positioning holes 11. Exemplarily, the metal composite plate 10 may include but is not limited to a copper-aluminum composite plate.

[0046] Specifically, the welding carrier includes a carrier body 100 and a positioning post 200. The carrier body 100 includes a carrier substrate 101, which is provided with a first positioning groove 110 for accommodating a silver dot 20. The silver dot 20 and the metal composite plate 10 are sequentially arranged on the first groove bottom surface 111 of the first positioning groove 110. One end of the positioning post 200 is provided on the carrier body 100, and the other end of the positioning post 200 is used to penetrate the positioning hole 11 in the metal composite plate 10, with the positioning post 200 being in contact with the hole wall of the positioning hole 11.

[0047] When using a welding carrier to position the metal composite plate 10 and the silver dot 20, the silver dot 20 is first placed in the first positioning groove 110 on the carrier body 100. Then, the positioning post 200 is penetrated through the positioning hole 11 of the metal composite plate 10. The first groove bottom surface 111 of the first positioning groove 110, the silver dot 20, and the metal composite plate 10 are aligned with each other in sequence. This achieves the positioning and assembly of the metal composite plate 10 and the silver dot 20 relative to the welding carrier. In other words, the positioning between the metal composite plate 10 and the silver dot 20 is achieved, effectively ensuring the welding accuracy of the metal composite plate 10 and the silver dot 20.

[0048] For example, the metal composite plate 10 and the silver dots 20 may be soldered together via solder sheets 30 .

[0049] For example, at least one silver dot 20 can be welded to the metal composite plate 10, and the first positioning grooves 110 are provided in a one-to-one correspondence with the silver dot 20. Optionally, two silver dots 20 are welded to the metal composite plate 10 at intervals along the first direction, and two first positioning grooves 110 are provided on the carrier body 100 at intervals along the first direction.

[0050] For example, at least one positioning post 200 may be provided on the carrier body 100 .

[0051] For example, the cross-sectional shape of the positioning post 200 includes but is not limited to a circle, a square or a triangle.

[0052] Optionally, the cross-section of the positioning post 200 is circular, and two positioning posts 200 are provided on the carrier body 100 at intervals along the second direction to ensure the positioning and assembly of the metal composite plate 10 relative to the carrier body 100 .

[0053] In one feasible embodiment, the carrier body 100 is provided with a stepped hole 120. The positioning post 200 includes a large end portion 210 and a small end portion 220 that are interconnected. The large end portion 210 is inserted into the large end of the stepped hole 120, and the small end portion 220 is inserted into the small end of the stepped hole 120. This facilitates the positioning and assembly of the positioning post 200 relative to the carrier. The small end portion 220 protrudes from the stepped hole 120 and is used to penetrate the positioning hole 11 in the metal composite plate 10.

[0054] Exemplarily, the small end portion 220 is provided with a chamfer or a rounded corner to facilitate penetration of the positioning hole 11 on the metal composite plate 10 .

[0055] For example, the positioning column 200 may be connected to the carrier body 100 by gluing or threading.

[0056] In one feasible embodiment, a second positioning groove 130 is provided on the carrier base plate 101, and a first positioning groove 110 is provided on the second groove bottom surface 131 of the second positioning groove 130. The positioning post 200 extends into the second positioning groove 130. The second positioning groove 130 is used to accommodate the metal composite plate 10. In this embodiment, the design of the second positioning groove 130 can protect the positioning post 200, effectively preventing damage to the positioning post 200 and improving the structural compactness of the welding carrier. In addition, the second positioning groove 130, in conjunction with the positioning post 200, can quickly determine the orientation of the metal composite plate 10 relative to the carrier body 100, facilitating the positioning and assembly of the metal composite plate 10 relative to the carrier body 100.

[0057] Exemplarily, the extending direction of the positioning post 200 is perpendicular to both the first direction and the second direction.

[0058] In this embodiment, the metal composite plate 10 includes a first bottom surface 12 and a first top surface 13 . The first bottom surface 12 faces away from the second groove bottom surface 131 of the second positioning groove 130 , and the first top surface 13 faces the second groove bottom surface 131 of the second positioning groove 130 .

[0059] In some embodiments, the first bottom surface 12 of the metal composite plate 10 facing away from the second groove bottom surface 131 of the second positioning groove 130 is coplanar with the carrier substrate 101 , facilitating positioning and assembly between the metal composite plate 10 and the carrier body 100 .

[0060] In other embodiments, the first bottom surface 12 of the metal composite plate 10, which is away from the second groove bottom surface 131 of the second positioning groove 130, protrudes from the carrier substrate 101. The metal composite plate 10 is pressed on the carrier body 100 to facilitate the first groove bottom surface 111 of the first positioning groove 110, the silver point 20 and the metal composite plate 10 to be stably abutted in sequence, thereby ensuring the welding quality of the metal composite plate 10 and the silver point 20.

[0061] In a feasible embodiment, the second groove bottom surface 131 of the second positioning groove 130 is spaced apart from the metal composite plate 10, effectively ensuring that the first groove bottom surface 111 of the first positioning groove 110, the silver point 20 and the metal composite plate 10 are stably abutted against each other in sequence, thereby ensuring the welding quality of the metal composite plate 10 and the silver point 20.

[0062] In this embodiment, the silver dot 20 includes a second bottom surface 21 and a second top surface 22 . The second bottom surface 21 faces away from the first bottom surface 111 of the first positioning groove 110 , and the second top surface 22 faces the first bottom surface 111 of the first positioning groove 110 .

[0063] In some embodiments, the second bottom surface 21 of the silver dot 20 facing away from the first bottom surface 111 of the first positioning groove 110 protrudes from the first positioning groove 110 , so that the second bottom surface 131 of the second positioning groove 130 is spaced apart from the metal composite plate 10 .

[0064] In other embodiments, the second bottom surface 21 of the silver dot 20 facing away from the first groove bottom surface 111 of the first positioning groove 110 does not protrude from the first positioning groove 110, and the solder sheet 30 protrudes from the first positioning groove 110, so that the second groove bottom surface 131 of the second positioning groove 130 is spaced apart from the metal composite plate 10, thereby facilitating the positioning of the solder sheet 30 relative to the silver dot 20 and the metal composite plate 10.

[0065] In a feasible embodiment, the second positioning groove 130 is not provided on the carrier substrate 101. The carrier substrate 101 is spaced apart from the metal composite plate 10 to ensure that the first groove bottom surface 111 of the first positioning groove 110, the silver dot 20 and the metal composite plate 10 are stably abutted against each other in sequence, thereby ensuring the welding quality of the metal composite plate 10 and the silver dot 20.

[0066] In one feasible embodiment, the carrier body 100 can be made of graphite. Graphite carrier bodies 100 have high molding precision, high mechanical strength, wear resistance, corrosion resistance, and excellent high-temperature resistance. They remain unchanged at high temperatures, allowing for multiple cycles and a long service life. Graphite carrier bodies 100 also have high thermal conductivity, enabling rapid heat transfer to ensure uniform heating of the metal composite plate 10, effectively preventing deformation during welding of the metal composite plate 10 with the silver dots 20, and ensuring a high-quality weld between the metal composite plate 10 and the silver dots 20. Furthermore, graphite does not fuse with the solder sheet 30, preventing the solder sheet 30 from welding the carrier body 100 and the metal composite plate 10 together during welding. In this embodiment, a gap is formed between the sidewalls of the first positioning groove 110 and the silver dots 20 to allow for thermal expansion of the silver dots 20. A gap is also formed between the sidewalls of the second positioning groove 130 and the metal composite plate 10 to allow for thermal expansion of the metal composite plate 10.

[0067] Of course, the material of the carrier body 100 can also be a material with good thermal conductivity such as diamond, silver, silicon carbide or silicon nitride, and this application does not limit it.

[0068] In this embodiment, the welding fixture uses its own weight to compress the metal composite plate 10 and the silver dots 20, providing pressure during the welding process. This ensures that the metal composite plate 10 and the silver dots 20 are tightly attached after the solder sheet 30 melts, thereby ensuring the quality of the weld between the metal composite plate 10 and the silver dots 20. Furthermore, the welding fixture can flatten any slight deformation of the silver dots 20 during processing, further ensuring the quality of the weld between the metal composite plate 10 and the silver dots 20.

[0069] In one possible implementation, Figure 2 As shown, a counterweight 300 is embedded in the carrier body 100 . The density of the counterweight 300 is greater than that of the carrier body 100 , so as to ensure that the carrier body 100 presses the metal composite plate 10 and the silver point 20 tightly.

[0070] Illustratively, the material of the counterweight 300 includes but is not limited to metal tungsten, tungsten alloy or alloy steel.

[0071] For example, the counterweight 300 can apply a pressure greater than or equal to 187N to the silver point 20 through the carrier body 100 .

[0072] Reference Figures 1 to 6 As shown, this embodiment further provides a welding device, which includes a brazing furnace and the above-mentioned welding carrier.

[0073] Specifically, the brazing furnace includes a brazing furnace body 410 and a conveying mechanism 420 . The welding carrier is disposed on the conveying mechanism 420 . The conveying mechanism 420 is used to convey the welding carrier into the brazing furnace body 410 .

[0074] In this embodiment, the conveying mechanism 420 transports the welding carrier loaded with the metal composite plate 10 and the silver dots 20 into the brazing furnace body 410 for welding. This is safe, reliable, and convenient for welding the metal composite plate 10 and the silver dots 20. Furthermore, the metal composite plate 10 is evenly heated within the brazing furnace body 410, effectively preventing localized overheating of the metal composite plate 10 and, consequently, deformation of the metal composite plate 10 during welding with the silver dots 20, thereby ensuring a high-quality weld between the metal composite plate 10 and the silver dots 20.

[0075] Exemplarily, the carrier body 100 presses the metal composite plate 10 and the silver dots 20 onto the conveying mechanism 420 to ensure welding quality of the metal composite plate 10 and the silver dots 20 .

[0076] For example, the conveyor mechanism 420 may be a conveyor belt mechanism. Its specific structure is conventional and not the focus of this application, so it will not be described in detail here. The brazing furnace body 410 is located between the loading and unloading ends of the conveyor mechanism 420. A welding carrier loaded with the metal composite plate 10 and silver dots 20 is placed on the loading end of the conveyor mechanism 420. The welded metal composite plate 10 and silver dots 20, along with the welding carrier, are then removed from the unloading end of the conveyor mechanism 420.

[0077] In a feasible embodiment, the brazing furnace body 410 is provided with an air inlet channel (not shown), through which a reducing gas can be introduced into the brazing furnace body 410. The reducing gas can prevent the metal composite plate 10 and the silver dots 20 from oxidizing in the brazing furnace body 410, and can reduce the oxides on the metal composite plate 10 and the silver dots 20 to ensure the welding quality of the metal composite plate 10 and the silver dots 20.

[0078] For example, the reducing gas may be a mixed gas of hydrogen and nitrogen.

[0079] For example, the proportion of hydrogen in the reducing gas may be in the range of 2.5%-5%.

[0080] Illustratively, the air inlet passage is connected to a gas cylinder 500 , and reducing gas can be introduced into the brazing furnace body 410 through the gas cylinder 500 .

[0081] In one feasible embodiment, the brazing furnace body 410 is provided with a preheating zone 411, a heating zone 412, and a cooling zone 413 along the conveying direction of the conveying mechanism 420. The temperature of the preheating zone 411 is lower than that of the heating zone 412. In this embodiment, the metal composite plate 10 and the silver dots 20 are preheated in the preheating zone 411 and then transported to the heating zone 412 by the conveying mechanism 420 for heating. This gradually increases the temperature of the metal composite plate 10 and the silver dots 20, effectively preventing deformation of the metal composite plate 10 and ensuring the quality of the weld between the metal composite plate 10 and the silver dots 20. After welding, the metal composite plate 10 and the silver dots 20 are transported to the cooling zone 413 by the conveying mechanism 420 for cooling.

[0082] For example, the brazing furnace body 410 is provided with air inlet passages in the preheating zone 411, the heating zone 412, and the cooling zone 413. The cooling zone 413 can cool the metal composite plate 10 and the silver dots 20 by air cooling.

[0083] In this embodiment, the welding apparatus further includes a controller 600. The brazing furnace body 410 and the conveying mechanism 420 are electrically connected to the controller 600. The controller 600 controls the brazing furnace body 410 to heat the metal composite plate 10 and the silver spot 20, and controls the conveying mechanism 420 to transport the welding carrier. The controller 600 can also set parameters for the temperatures of the preheating zone 411 and the heating zone 412, as well as the conveying speed of the conveying mechanism 420.

[0084] Exemplarily, the controller 600 may include, but is not limited to, a programmable logic controller (PLC).

[0085] For example, the specific process of welding and positioning the metal composite plate 10 and the silver point 20 is as follows:

[0086] First, place the carrier body 100 with the first positioning groove 110 facing upward, place the silver dot 20 into the first positioning groove 110, place the solder sheet 30 on the silver dot 20, and put the metal composite plate 10 on the positioning post 200. Press the carrier body 100 and the metal composite plate 10 firmly until the first groove bottom surface 111 of the first positioning groove 110, the silver dot 20, the solder sheet 30, and the metal composite plate 10 are aligned with each other.

[0087] Then, the welding carrier with the metal composite plate 10 and the silver dots 20 is turned over and placed on the loading end of the conveying mechanism 420, so that the carrier body 100 presses the silver dots 20, the solder sheet 30 and the metal composite plate 10 onto the conveying mechanism 420.

[0088] Finally, the conveying mechanism 420 is controlled to transport the welding carrier equipped with the metal composite plate 10 and the silver dots 20 from the loading end to the preheating zone 411, the heating zone 412, the cooling zone 413 and the unloading end in sequence to complete the welding and remove the welding carrier equipped with the metal composite plate 10 and the silver dots 20 at the unloading end.

[0089] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A welding carrier for welding a metal composite plate (10) and a silver point (20), characterized in that: The welding carrier comprises: A carrier body (100) includes a carrier substrate (101), wherein a first positioning groove (110) is provided on the carrier substrate (101), wherein the first positioning groove (110) is used to accommodate the silver dot (20), and the silver dot (20) and the metal composite plate (10) are sequentially arranged on a first groove bottom surface (111) of the first positioning groove (110); A positioning column (200), one end of which is provided on the carrier body (100), and the other end of which is used to penetrate a positioning hole (11) on the metal composite plate (10), and the positioning column (200) is in contact with the hole wall of the positioning hole (11).

2. The welding carrier according to claim 1, characterized in that: The carrier substrate (101) is spaced apart from the metal composite plate (10).

3. The welding carrier according to claim 1, characterized in that: A second positioning groove (130) is provided on the carrier substrate (101); the first positioning groove (110) is provided on a second groove bottom surface (131) of the second positioning groove (130); the positioning column (200) extends into the second positioning groove (130); and the second positioning groove (130) is used to accommodate the metal composite plate (10).

4. The welding carrier according to claim 3, characterized in that: The first bottom surface (12) of the metal composite plate (10) facing away from the second groove bottom surface (131) of the second positioning groove (130) is in the same plane as the carrier substrate (101); Or the first bottom surface (12) of the metal composite plate (10) facing away from the second groove bottom surface (131) of the second positioning groove (130) protrudes from the carrier substrate (101).

5. The welding carrier according to claim 3, characterized in that: The second groove bottom surface (131) of the second positioning groove (130) is spaced apart from the metal composite plate (10).

6. The welding carrier according to claim 1, characterized in that The carrier body (100) is provided with a stepped hole (120), and the positioning column (200) includes a large end (210) and a small end (220) connected to each other, the large end (210) is passed through the large end of the stepped hole (120), and the small end (220) is passed through the small end of the stepped hole (120).

7. The welding carrier according to claim 1, characterized in that: The carrier body (100) is made of graphite.

8. The welding carrier according to claim 1, characterized in that: A counterweight block (300) is embedded in the carrier body (100), and the density of the counterweight block (300) is greater than the density of the carrier body (100).

9. A welding device, characterized in that: comprising a brazing furnace and a welding carrier as claimed in any one of claims 1 to 8; The brazing furnace comprises a brazing furnace body (410) and a conveying mechanism (420); The welding carrier is arranged on the conveying mechanism (420), and the conveying mechanism (420) is used to convey the welding carrier into the brazing furnace body (410).

10. The welding device according to claim 9, characterized in that The brazing furnace body (410) is provided with an air inlet passage, and the brazing furnace body (410) can be introduced with reducing gas through the air inlet passage.

Images