Flange, connecting pipe assembly and auxiliary welding device

Abstract

The utility model belongs to the technical field of flange connecting pipe welding, and discloses a flange, a connecting pipe assembly and an auxiliary welding device. The flange is used for being connected with a connecting pipe in a welded mode, the connecting pipe comprises an inclined pipe part arranged at the end, the flange comprises a flange body and an annular boss, a communicating hole is formed in the flange body, the annular boss is connected to the inner circumferential wall of the communicating hole, and the end face of the annular boss can abut against the end face of the inclined pipe part inserted into the flange body. The inner diameter of the annular boss is larger than that of the inclined pipe part, the inner circumferential wall of the annular boss can be connected with the end face of the inclined pipe part in a welded mode, and the included angle alpha formed by the inner circumferential wall of the annular boss and the end face, abutting against the inclined pipe part, of the annular boss is smaller than or equal to 90 degrees. According to the structural design of the flange, the deformation when the flange and the connecting pipe are welded can be reduced, it is guaranteed that a welding gun does not interfere with a welding face in the welding process, meanwhile, welding flux can be more fully filled in a welding area, the welding strength is guaranteed, and the quality of welded products is improved.

Description

Technical Field

[0001] This utility model relates to the field of flange connecting pipe welding technology, and in particular to a flange, connecting pipe assembly and auxiliary welding device. Background Technology

[0002] During the manufacturing process, connecting pipes often need to be welded to flanges. The connecting pipes and flanges are typically welded together using self-fusion welding on the same horizontal plane. However, self-fusion welding can easily lead to large welding deformation between the connecting pipes and flanges, reducing the weld strength between them.

[0003] In related technologies, in order to reduce the deformation caused during welding of connecting pipes and flanges, filler welding is used between flanges and connecting pipes. When filler welding is used between flanges and connecting pipes, the welding surface of the connecting pipe is treated as a lower surface relative to the welding surface of the flange. The welding surface of the inclined pipe at the end of the connecting pipe will cause interference between the welding torch and the welding area, making welding difficult. At the same time, it will be difficult for the solder to fill into the weld, and the effective welding amount cannot be guaranteed. Utility Model Content

[0004] The first objective of this invention is to provide a flange that can solve the problem of large deformation during welding of the flange and connecting pipe, while also ensuring that the welding torch does not interfere with the welding area, better filling of the welding material, and ensuring welding strength.

[0005] The second objective of this invention is to provide a connecting pipe assembly that can ensure the accuracy and strength of the connecting pipe assembly.

[0006] The third objective of this invention is to provide an auxiliary welding device that can improve the quality of welding connecting pipe assemblies and make welding operations on connecting pipe assemblies easier.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A flange for welding connection to a connecting pipe, the connecting pipe including an inclined pipe portion at one end, the flange comprising:

[0009] Flange body, wherein the flange body is provided with a connecting hole; and

[0010] An annular boss is connected to the inner peripheral wall of the communicating hole, and the end face of the annular boss can abut against the end face of the inclined tube portion inserted into the flange body. The inner diameter of the annular boss is larger than the inner diameter of the inclined tube portion. The inner peripheral wall of the annular boss can be welded to the end face of the inclined tube portion, and the included angle α formed by the inner peripheral wall of the annular boss and the end face of the annular boss and the inclined tube portion abutting is less than or equal to 90°.

[0011] Preferably, when the end face of the annular boss abuts against the end face of the inclined tube portion inserted into the flange body, the distance h between the inner edge of the end face of the annular boss and the inner edge of the end face of the inclined tube portion along the radial direction of the annular boss is 1mm-2.5mm.

[0012] Preferably, the thickness d of the annular boss is 2mm-2.5mm.

[0013] A connecting pipe assembly includes the connecting pipe and a flange as described above, wherein at least one end of the connecting pipe is the inclined pipe portion, and the flange is welded to the inclined pipe portion.

[0014] Preferably, both ends of the connecting pipe are inclined pipe sections, and the flanges are welded to the end faces of both inclined pipe sections.

[0015] An auxiliary welding device is used to install the aforementioned connecting pipe assembly, including a first mounting part and a second mounting part. The first mounting part is used to fit and connect with one of the flanges, and the second mounting part is used to fit and connect with the other flange. The two flanges are not coaxial.

[0016] Preferably, the auxiliary welding device includes a first mounting component, a second mounting component, and a connecting component. The first mounting component, the connecting component, and the second mounting component are sequentially connected to form a U-shaped structure, and both the flange and the connecting pipe can be installed in the U-shaped structure.

[0017] Preferably, the first mounting component includes a first positioning surface and a second positioning surface, the first positioning surface and the second positioning surface being parallel and spaced apart along the axial direction of the inclined tube portion;

[0018] The second mounting component includes a third positioning surface and a fourth positioning surface, the third positioning surface and the fourth positioning surface being parallel and spaced apart along the axial direction of the inclined tube portion;

[0019] The first positioning surface and the third positioning surface constitute the first mounting part, and the second positioning surface and the fourth positioning surface constitute the second mounting part.

[0020] Preferably, the auxiliary welding device further includes:

[0021] The fastener has connection holes on the first positioning surface, the second positioning surface, the third positioning surface, and the fourth positioning surface. Each connection hole corresponds to a fastener, and the fastener passes through the flange body and is threadedly connected to the corresponding connection hole.

[0022] Preferably, the first mounting component further includes a first limiting surface and a second limiting surface, and the second mounting component further includes a third limiting surface and a fourth limiting surface;

[0023] The first limiting surface and the first positioning surface are perpendicularly connected, the second limiting surface and the second positioning surface are perpendicularly connected, the third limiting surface and the third positioning surface are perpendicularly connected, and the fourth limiting surface and the fourth positioning surface are perpendicularly connected.

[0024] The first limiting surface and the third limiting surface are parallel and spaced apart, and the second limiting surface and the fourth limiting surface are parallel and spaced apart;

[0025] The first limiting surface and the third limiting surface can both abut against the outer peripheral wall of one of the flange bodies, and the second limiting surface and the fourth limiting surface can both abut against the outer peripheral wall of the other flange body.

[0026] The beneficial effects of this utility model are:

[0027] This utility model provides a flange for welding connection with a connecting pipe. The connecting pipe includes an inclined tube portion disposed at its end. The flange includes a flange body and an annular boss. The flange body is provided with a communicating hole. The annular boss is connected to the inner peripheral wall of the communicating hole, and the end face of the annular boss can abut against the end face of the inclined tube portion inserted into the flange body. The inner diameter of the annular boss is larger than the inner diameter of the inclined tube portion. The inner peripheral wall of the annular boss can be welded to the end face of the inclined tube portion, and the included angle α formed by the inner peripheral wall of the annular boss and the end face of the annular boss and the inclined tube portion abutting is less than or equal to 90°. By providing an annular boss on the inner circumferential wall of the connecting hole on the flange body, the end face of the annular boss can abut against the end face of the inclined tube inserted into the flange body, and the inner diameter of the annular boss is larger than the inner diameter of the inclined tube. The inner circumferential wall of the annular boss can be welded to the end face of the inclined tube. Thus, the inner circumferential wall of the annular boss and the end face of the inclined tube are welded together by filler welding, which can reduce the amount of deformation during welding and improve the welding strength between the flange and the connecting pipe. In addition, since the included angle α formed by the inner circumferential wall of the annular boss and the end face of the annular boss and the inclined tube is less than or equal to 90°, the complementary included angle α formed by the welding area is greater than or equal to 90°. This can ensure that the welding torch does not interfere with the welding surface during welding, and can more fully fill the welding area with welding material, ensuring welding strength and improving the quality of the welded product.

[0028] This utility model also provides a connecting pipe assembly, which avoids deformation during welding by welding the flanges at the inclined pipe ends of the connecting pipe, thus ensuring the accuracy and strength of the connecting pipe assembly.

[0029] This utility model also provides an auxiliary welding device for assisting in the welding of the above-mentioned connecting pipe assembly, which facilitates the welding operation of the connecting pipe assembly and improves the quality of welding the connecting pipe assembly. Attached Figure Description

[0030] Figure 1 This is a structural cross-sectional view of the connecting pipe assembly provided in this embodiment of the utility model;

[0031] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0032] Figure 3 yes Figure 1 A magnified view of a section at point B in the middle;

[0033] Figure 4 The isometric view of the auxiliary welding device provided in this embodiment of the utility model Figure 1 ;

[0034] Figure 5 The isometric view of the auxiliary welding device provided in this embodiment of the utility model Figure 2 ;

[0035] Figure 6 The isometric view of the connecting pipe assembly provided in this embodiment of the present invention, mounted on the auxiliary welding device. Figure 1 ;

[0036] Figure 7 The isometric view of the connecting pipe assembly provided in this embodiment of the present invention, mounted on the auxiliary welding device. Figure 2 .

[0037] In the picture:

[0038] 10. Flange; 1. Flange body; 11. Mounting hole; 12. Connecting hole; 2. Annular boss;

[0039] 20. Inclined tube section;

[0040] 4. Auxiliary welding device; 41. First mounting component; 411. First positioning surface; 412. Second positioning surface; 413. First limiting surface; 414. Second limiting surface; 42. Second mounting component; 421. Third positioning surface; 422. Fourth positioning surface; 423. Third limiting surface; 424. Fourth limiting surface; 43. Connecting component; 44. Connecting hole. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] like Figures 1-3As shown, this embodiment provides a flange 10 for welding connection with a connecting pipe. The connecting pipe includes an inclined tube portion 20 disposed at its end. The flange 10 includes a flange body 1 and an annular boss 2. The flange body 1 is provided with a connecting hole 12. The annular boss 2 is connected to the inner peripheral wall of the connecting hole 12, and the end face of the annular boss 2 can abut against the end face of the inclined tube portion 20 inserted into the flange body 1. The inner diameter of the annular boss 2 is larger than the inner diameter of the inclined tube portion 20. The inner peripheral wall of the annular boss 2 can be welded to the end face of the inclined tube portion 20, and the included angle α formed by the inner peripheral wall of the annular boss 2 and the end faces of the annular boss 2 and the inclined tube portion 20 abutting is less than or equal to 90°. By providing an annular boss 2 on the inner circumferential wall of the connecting hole 12 on the flange body 1, the end face of the annular boss 2 can abut against the end face of the inclined tube portion 20 of the connecting pipe inserted into the flange body 1, and the inner diameter of the annular boss 2 is larger than the inner diameter of the inclined tube portion 20. The inner circumferential wall of the annular boss 2 can be welded to the end face of the inclined tube portion 20, thereby welding the inner circumferential wall of the annular boss 2 and the end face of the inclined tube portion 20 by filler welding, thereby reducing the amount of deformation during welding and improving the welding strength between the flange 10 and the connecting pipe. In addition, since the included angle α formed by the inner circumferential wall of the annular boss 2 and the end face of the annular boss 2 and the inclined tube portion 20 abutting is less than or equal to 90°, the included angle complementary to α formed by the welding area is greater than or equal to 90°, which can ensure that the welding torch does not interfere with the welding surface during welding, and can more fully fill the welding area with welding material, ensuring welding strength and improving the quality of the welded product.

[0046] Optionally, in this embodiment, the included angle α formed by the inner peripheral wall of the annular boss 2 and the end face abutting the annular boss 2 and the inclined tube portion 20 is equal to 90°, thereby ensuring that the included angle complementary to α in the welding area is equal to 90°. This ensures that the welding torch does not interfere with the welding surface during welding, and also allows for more complete filling of the welding area with solder. In other embodiments, the included angle α formed by the inner peripheral wall of the annular boss 2 and the end face abutting the annular boss 2 and the inclined tube portion 20 can be less than 90°, thereby making the included angle complementary to α in the welding area greater than 90°, which further facilitates the filling of the welding area with solder.

[0047] Furthermore, such as Figure 2 and Figure 3As shown, when the end face of the annular boss 2 abuts against the end face of the inclined tube portion 20 inserted into the flange body 1, the distance h between the inner edge of the end face of the annular boss 2 and the inner edge of the end face of the inclined tube portion 20 along the radial direction of the annular boss 2 is 1mm-2.5mm. This ensures that the solder can be filled into the welding area during filler welding, preventing poor welding quality caused by insufficient solder in the welding area. Optionally, the distance h between the inner edge of the end face of the annular boss 2 and the inner edge of the end face of the inclined tube portion 20 can be 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.2mm, or 2.5mm. In this embodiment, 2.2mm is preferred, which allows the solder to fully fill the welding area and ensures that the weld bead size meets the 2mm requirement.

[0048] Optionally, such as Figure 2 and Figure 3 As shown, in this embodiment, the inner diameter of the annular boss 2 is 147.8mm-149.3mm, and can be 147.8mm, 147.9mm, 148.0mm, 148.1mm, 148.2mm, 148.3mm, 148.4mm, 148.5mm, 148.6mm, 148.7mm, 148.8mm, 148.9mm, 149.0mm, 149.1mm, 149.2mm, or 149.3mm, preferably 148.1mm. This ensures that the distance h between the inner edge of the end face of the annular boss 2 and the inner edge of the end face of the inclined tube portion 20 is 2.2mm along the radial direction of the annular boss 2, thereby further ensuring the welding quality of the flange 10 and the inclined tube portion 20. In other embodiments, the inner diameter of the annular boss 2 is set according to requirements, so that the distance h between the inner edge of the end face of the annular boss 2 and the inner edge of the end face of the inclined tube 20 is 1mm-2.5mm.

[0049] Optionally, such as Figures 2-3 As shown, in this embodiment, the wall thickness of the inclined tube portion 20 of the connecting pipe is 2mm-3mm, and can be 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, preferably 2.5mm. This not only prevents excessive or insufficient filler material in the welding area, but also prevents loosening of the flange body 1 and the inclined tube portion 20 after welding due to insufficient thickness of the inclined tube portion 20, thus ensuring the connection stability of the flange body 1 and the inclined tube portion 20. In other embodiments, the wall thickness of the inclined tube portion 20 of the connecting pipe is set according to process requirements.

[0050] Further, the thickness d of the annular boss 2 is 2mm-2.5mm. Optionally, in this embodiment, the thickness d of the annular boss 2 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or 2.5mm. In this embodiment, the thickness of the annular boss 2 is preferably 2.2mm, which can meet the requirements of a full weld with a weld height of 2mm, ensuring good welding strength for both the inner circumferential wall of the annular boss 2 and the end face of the inclined tube portion 20, while also ensuring an aesthetically pleasing weld surface. In other embodiments, the thickness of the annular boss 2 is set according to requirements, as long as good welding strength and an aesthetically pleasing weld surface are achieved.

[0051] like Figure 1 As shown, this embodiment also provides a connecting pipe assembly, which includes a connecting pipe and a flange 10. At least one end of the connecting pipe is an inclined pipe portion 20, and the flange 10 is welded to the inclined pipe portion 20. By applying the aforementioned flange 10 and welding it to the inclined pipe portion 20, the connecting pipe assembly provided in this embodiment avoids deformation during welding, ensuring the accuracy and strength of the connecting pipe assembly. It should be noted that the connecting pipe can have an inclined pipe portion 20 at one end or both ends, depending on the requirements.

[0052] Optionally, in this embodiment, argon arc welding can be used to weld the flange 10 and the inclined pipe section 20. Argon arc welding can ensure high quality at the weld and prevent oxidation of the welding material. In other embodiments, the welding process can be set according to requirements. Optionally, in this embodiment, argon gas is introduced as a protective gas during the argon arc welding process, and the argon gas flow rate is 2.5 L / min. The introduction of argon gas can prevent oxidation at the weld and improve the quality of the weld joint. In other embodiments, the argon gas flow rate can be set according to requirements.

[0053] Furthermore, both ends of the connecting pipe are inclined pipe sections 20, and flanges 10 are welded to the end faces of both inclined pipe sections 20. The inclined pipe sections 20 at both ends of the connecting pipe enable the connecting pipe assembly to connect two connecting pipes with different axes, so as to accommodate the deviation of the two connecting pipes with different axes and ensure the connectivity of the entire pipeline system.

[0054] Optionally, in this embodiment, the connecting pipe is an inclined pipe, and the inclination degree of the connecting pipe is the same as that of the inclined pipe portion 20. The outer peripheral wall of the inclined pipe portion 20 is adapted to the inner peripheral wall of the connecting hole 12, which can ensure the connection stability between the flange 10 and the inclined pipe portion 20. In other embodiments, the shape of the connecting pipe is not required, and it can be a straight pipe, a corrugated pipe, etc., as long as both ends of the connecting pipe are inclined pipe portions 20.

[0055] like Figure 4 and Figure 5As shown, this embodiment also provides an auxiliary welding device 4 for installing a connecting pipe assembly. It includes a first mounting part and a second mounting part. The first mounting part is used for contacting one of the flanges 10, and the second mounting part is used for contacting the other flange 10. The two flanges 10 are coaxial. Since the two flanges 10 are coaxial, the auxiliary welding device 4, through the contacting connection of the first and second mounting parts with the two coaxial flanges 10, can effectively reduce the difficulty of installing the connecting pipe assembly, enabling the auxiliary welding device 4 to accurately position and relatively fix the two coaxial flanges 10.

[0056] Furthermore, the auxiliary welding device 4 includes a first mounting component 41, a second mounting component 42, and a connecting component 43. The first mounting component 41, the connecting component 43, and the second mounting component 42 are sequentially connected to form a U-shaped structure, in which the flange 10 and the connecting pipe can be installed. By installing the entire connecting pipe assembly in the U-shaped structure, the reliability of the positioning of the connecting pipe assembly is improved, and the structure is simple.

[0057] Optionally, in this embodiment, the first mounting member 41 and the second mounting member 42 are configured as column shapes, and the connector 43 is configured as a plate shape. In other embodiments, the shapes of the first mounting member 41, the second mounting member 42, and the connector 43 are set according to requirements, so that the first mounting member 41, the connector 43, and the second mounting member 42 can be connected in sequence to form a U-shaped structure.

[0058] Furthermore, such as Figures 4-7 As shown, the first mounting component 41 includes a first positioning surface 411 and a second positioning surface 412, which are parallel and spaced apart along the axial direction of the inclined tube portion 20. The second mounting component 42 includes a third positioning surface 421 and a fourth positioning surface 422, which are parallel and spaced apart along the axial direction of the inclined tube portion 20. The first positioning surface 411 and the third positioning surface 421 constitute the first mounting portion, and the second positioning surface 412 and the fourth positioning surface 422 constitute the second mounting portion. By setting the first mounting portion and the second mounting portion to fit and connect with the flanges 10 at corresponding positions, the stability and reliability of the connection are improved. In addition, by installing and positioning two flanges 10 with different axes, the accurate positioning of the connecting pipe in the auxiliary welding device 4 is also achieved.

[0059] Furthermore, such as Figures 4-7As shown, the auxiliary welding device 4 also includes fasteners (not shown in the figure). Connecting holes 44 are provided on the first positioning surface 411, the second positioning surface 412, the third positioning surface 421, and the fourth positioning surface 422. Each connecting hole 44 corresponds to a fastener, which passes through the flange body 1 and is threadedly connected to the corresponding connecting hole 44. By using fasteners to connect the positioning surfaces and the flange body 1, a detachable connection between the positioning surfaces and the flange body 1 is achieved, ensuring the connection stability of the flange body 1 and making the installation and removal of the flange body 1 on the positioning surfaces more convenient. Optionally, the fastener can be a bolt. Specifically, in this embodiment, a mounting hole 11 is provided on the flange body 1, and the fastener passes through the mounting hole 11 and is threadedly connected to the corresponding connecting hole 44.

[0060] Optionally, in this embodiment, the first positioning surface 411, the second positioning surface 412, the third positioning surface 421, and the fourth positioning surface 422 each have two connecting holes 44, effectively ensuring the strength of the connection between the flange body 1 and each positioning surface. In other embodiments, the number of connecting holes 44 and the corresponding number of fasteners are determined according to the situation, as long as the stability of the flange body 1 on the auxiliary welding device 4 can be maintained.

[0061] Furthermore, the first mounting component 41 also includes a first limiting surface 413 and a second limiting surface 414, and the second mounting component 42 also includes a third limiting surface 423 and a fourth limiting surface 424. The first limiting surface 413 and the first positioning surface 411 are perpendicularly connected, the second limiting surface 414 and the second positioning surface 412 are perpendicularly connected, the third limiting surface 423 and the third positioning surface 421 are perpendicularly connected, and the fourth limiting surface 424 and the fourth positioning surface 422 are perpendicularly connected. The first limiting surface 413 and the third limiting surface 423 are parallel and spaced apart, and the second limiting surface 414 and the fourth limiting surface 424 are parallel and spaced apart. The first limiting surface 413 and the third limiting surface 423 can abut against the outer peripheral wall of one of the flange bodies 1, and the second limiting surface 414 and the fourth limiting surface 424 can abut against the outer peripheral wall of the other flange body 1. The above-mentioned limiting surfaces provide limiting between the flange body 1 and the auxiliary welding device 4, ensuring the stability of their connection.

[0062] To facilitate understanding of the connecting pipe assembly disclosed in this embodiment, the specific welding process of the connecting pipe assembly is now described:

[0063] S1. Fix one of the flanges 10 onto the auxiliary welding device 4, and then insert the connecting pipe into the flange body 1 of the flange 10, so that the end face of one of the inclined pipe portions 20 abuts against the end face of the annular boss 2 of the flange 10.

[0064] S2. Fit another flange 10 onto the connecting pipe, so that the end face of the other inclined pipe 20 abuts against the end face of the annular boss 2 of the other flange 10, and fix the other flange 10 on the auxiliary welding device 4.

[0065] S3. The inner peripheral wall of the annular boss 2 of one flange 10 and the end face of one inclined tube 20, as well as the inner peripheral wall of the annular boss 2 of the other flange 10 and the end face of the other inclined tube 20, are spot welded in sequence. The spot welding current is 120A.

[0066] S4. The inner peripheral wall of the annular boss 2 of one flange 10 and the end face of one inclined tube 20, as well as the inner peripheral wall of the annular boss 2 of another flange 10 and the end face of the other inclined tube 20, are fully welded in sequence, with a full welding current of 130A.

[0067] S5. Use CNC machining technology to perform machining on the welded connecting pipe assembly to make up the allowance.

[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A flange for welding connection to a connecting pipe, the connecting pipe including an inclined tube portion (20) disposed at an end, characterized in that, The flange includes: A flange body (1), wherein a connecting hole (12) is provided on the flange body (1); and An annular boss (2) is connected to the inner peripheral wall of the connecting hole (12), and the end face of the annular boss (2) can abut against the end face of the inclined tube (20) inserted into the flange body (1). The inner diameter of the annular boss (2) is larger than the inner diameter of the inclined tube (20). The inner peripheral wall of the annular boss (2) can be welded to the end face of the inclined tube (20). The included angle α formed by the inner peripheral wall of the annular boss (2) and the end face of the annular boss (2) and the inclined tube (20) abutting against each other is less than or equal to 90°.

2. The flange according to claim 1, characterized in that, When the end face of the annular boss (2) abuts against the end face of the inclined tube portion (20) inserted into the flange body (1), the distance h between the inner edge of the end face of the annular boss (2) and the inner edge of the end face of the inclined tube portion (20) along the radial direction of the annular boss (2) is 1mm-2.5mm.

3. The flange according to claim 1, characterized in that, The thickness d of the annular boss (2) is 2mm-2.5mm.

4. A connecting pipe assembly, characterized in that, Includes the connecting pipe and the flange as described in any one of claims 1-3, wherein at least one of the two ends of the connecting pipe is the inclined pipe portion (20), and the flange (10) is welded to the inclined pipe portion (20).

5. The connecting pipe assembly according to claim 4, characterized in that, Both ends of the connecting pipe are inclined tube sections (20), and the flanges (10) are welded to the end faces of both inclined tube sections (20).

6. An auxiliary welding device, characterized in that, The connecting pipe assembly for installing the claim 5 includes a first mounting portion and a second mounting portion, the first mounting portion being for fitting and connecting with one of the flanges (10), and the second mounting portion being for fitting and connecting with the other flange (10), the two flanges (10) being coaxial.

7. The auxiliary welding device according to claim 6, characterized in that, The auxiliary welding device (4) includes a first mounting component (41), a second mounting component (42), and a connector (43). The first mounting component (41), the connector (43), and the second mounting component (42) are connected in sequence to form a U-shaped structure. The flange (10) and the connecting pipe can both be installed in the U-shaped structure.

8. The auxiliary welding apparatus according to claim 7, characterized in that, The first mounting component (41) includes a first positioning surface (411) and a second positioning surface (412), the first positioning surface (411) and the second positioning surface (412) are parallel and spaced apart along the axial direction of the inclined tube portion (20); The second mounting component (42) includes a third positioning surface (421) and a fourth positioning surface (422), the third positioning surface (421) and the fourth positioning surface (422) being parallel and spaced apart along the axial direction of the inclined tube portion (20); The first positioning surface (411) and the third positioning surface (421) constitute the first mounting part, and the second positioning surface (412) and the fourth positioning surface (422) constitute the second mounting part.

9. The auxiliary welding apparatus according to claim 8, characterized in that, The auxiliary welding device (4) also includes: The fastener has a connecting hole (44) on the first positioning surface (411), the second positioning surface (412), the third positioning surface (421) and the fourth positioning surface (422). Each connecting hole (44) corresponds to a fastener. The fastener passes through the flange body (1) and is threaded to the corresponding connecting hole (44).

10. The auxiliary welding apparatus according to claim 8, characterized in that, The first mounting component (41) further includes a first limiting surface (413) and a second limiting surface (414), and the second mounting component (42) further includes a third limiting surface (423) and a fourth limiting surface (424); The first limiting surface (413) and the first positioning surface (411) are perpendicularly connected, the second limiting surface (414) and the second positioning surface (412) are perpendicularly connected, the third limiting surface (423) and the third positioning surface (421) are perpendicularly connected, and the fourth limiting surface (424) and the fourth positioning surface (422) are perpendicularly connected. The first limiting surface (413) and the third limiting surface (423) are parallel and spaced apart, and the second limiting surface (414) and the fourth limiting surface (424) are parallel and spaced apart; The first limiting surface (413) and the third limiting surface (423) can both abut against the outer peripheral wall of one of the flange bodies (1), and the second limiting surface (414) and the fourth limiting surface (424) can both abut against the outer peripheral wall of the other flange body (1).

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