A welding auxiliary device and welding method for flange and pipe

Abstract

The present invention discloses a flange-to-pipe welding auxiliary device and welding method, belonging to the field of shipbuilding technology. The flange-to-pipe welding auxiliary device comprises a flange sleeve mounted on the outer circumference of the pipe, the flange end face of the flange being spaced apart from the pipe end face, an inner fillet weld being provided between the pipe end face and the flange inner ring of the flange, a preset distance between the inner fillet weld and the flange end face so that the inner fillet weld does not extend beyond the flange end face, and a gasket having an L-shaped cross-section, the gasket comprising a base block and a boss protruding from a first end face of the base block, the first end face being configured to abut the flange end face, the boss being configured to extend into the flange, and the boss end face of the boss facing away from the base block facing the pipe end face, the spacing between the flange end face and the boss end face being a preset distance, the boss arc surface of the boss being configured to abut the flange inner ring, and the shape of the boss arc surface being adapted to the shape of the flange inner ring. The present invention improves weld quality and welding efficiency, and reduces welding difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a flange and pipe welding auxiliary device and a welding method. Background Art

[0002] like Figure 1-Figure 3 As shown, during the loading and assembling stage of the shipbuilding process, a certain number of steel pipes 200' and flanges 100' are assembled, and the assembly includes the following steps: the steel pipes 200' are matched and cut on site according to the on-site three-dimensional spatial position and the positioning dimensions in the drawings, and then the flange 100' is put on the outside of the steel pipe 200', and there is a certain distance between the end face of the flange 100' and the end face of the steel pipe 200', and then the inner fillet weld and the outer fillet weld are welded to the end face of the steel pipe 200' and the end face of the flange 100'.

[0003] When welding the inner fillet weld, the inner fillet weld must not extend beyond the flange 100' end face, and should be 1mm-2mm away from the flange 100' end face. Because the inner fillet weld must be as close to the flange 100' end face as possible while not extending beyond the flange 100' end face, welding from the inner ring of the flange 100' to the end face of the steel pipe 200' is difficult and difficult to ensure weld uniformity. In the existing technology, the first weld 300' is welded with the end face of the steel pipe 200' as the starting point and reference. Then, the weld is gradually continued toward the end face of the flange 100' and the end face of the steel pipe 200' until the area between the end face of the steel pipe 200' and the inner ring surface of the flange 100' is fully welded. However, due to limited on-site construction conditions during the shipboard assembly phase, the cut end face of the steel pipe 200' partially exhibits an irregular, wavy or jagged shape. After assembly with the flange 100', the distance between the end face of the steel pipe 200' and the end face of the flange 100' varies in width. Therefore, starting with the first weld 300', the weld seam already has a curved and irregular shape, ultimately resulting in poor straightness and quality across all welds. Furthermore, high welding currents can easily cause liquid metal to flow onto the end face of the flange 100', resulting in weld nubs or welds extending beyond the flange 100'. Using low welding currents and slow welding speeds results in low welding efficiency. Summary of the Invention

[0004] The object of the present invention is to provide a flange and pipe welding auxiliary device and welding method, which can improve the quality of the weld, reduce the welding difficulty and improve the welding efficiency.

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

[0006] On the one hand, a flange and a pipe welding auxiliary device is provided, wherein the flange is sleeved on the outer circumference of the pipe, the flange end face of the flange is spaced apart from the pipe end face, an inner fillet weld is provided between the pipe end face and the flange inner ring of the flange, and a preset distance is provided between the inner fillet weld and the flange end face so that the inner fillet weld does not extend beyond the flange end face.

[0007] The welding auxiliary device includes a gasket with an L-shaped cross-section, the gasket includes a base block and a boss protruding from the first end face of the base block, the first end face is used to abut the flange end face, the boss is used to extend into the flange, and the boss end face of the boss away from the base block faces the pipe end face, the distance between the flange end face and the boss end face is a preset distance, the boss arc surface of the boss is used to abut the flange inner ring, and the shape of the boss arc surface is adapted to the shape of the flange inner ring.

[0008] In some possible implementations, a first adhesive layer is provided on the first end surface and the boss arc surface.

[0009] In some possible implementations, the base block further includes an outer end face and a second end face, the second end face is opposite to the first end face, the outer end face is parallel to the flange inner ring, and the first end face and the second end face are fan-shaped.

[0010] In some possible implementations, the welding auxiliary device further includes an adhesive assembly, the adhesive assembly including a second adhesive layer and a sticker, the second adhesive layer being bonded between the liner and the sticker, the sticker being capable of being peeled off from the second adhesive layer, and the adhesive assembly being fan-shaped; the adhesive assembly includes:

[0011] a connecting portion bonded to the second end surface;

[0012] an overlapping portion connected to the connecting portion, the overlapping portion extending from a side surface of the base block along the circumference of the flange;

[0013] A protruding portion is connected to the connecting portion, and the protruding portion extends from the base block and can be bent to be bonded to the outer end surface and the flange end surface.

[0014] In some possible embodiments, a plurality of the gaskets are included, and the plurality of the gaskets are arranged along the circumference of the flange, the bosses of two adjacent gaskets are fitted together, and the plurality of gaskets are bonded together by the adhesive component to form a gasket combination, and the adhesive component extends out from the side of the gasket located at one end.

[0015] On the other hand, a flange and pipe welding method is provided, wherein the flange and pipe welding is achieved by using the flange and pipe welding auxiliary device as described above, and the flange and pipe welding method comprises:

[0016] Install the welding auxiliary device on the flange so that the boss of the gasket extends into the flange, the arc surface of the boss abuts against the inner ring of the flange, and the first end face abuts against the end face of the flange;

[0017] Perform internal fillet welds on the flange and pipe, using the boss end face as a reference to weld to the inner ring of the flange and the end face of the pipe.

[0018] In some possible implementations, a first adhesive layer is provided on the first end surface and the boss arc surface, and when the welding auxiliary device is installed on the flange, the method includes:

[0019] Prolonging the boss into the flange and abutting the first end face against the flange end face;

[0020] Pushing the gasket so that the arc surface of the boss abuts against the inner ring of the flange;

[0021] The gasket is compressed to adhere to the flange.

[0022] In some possible implementations, the welding auxiliary device includes an adhesive assembly, and a plurality of the gaskets are bonded together by the adhesive assembly to form a gasket assembly. When the plurality of the gasket assembly is installed on the flange, the method includes:

[0023] Place all the boss arc surfaces of the previous gasket assembly against the inner ring of the flange, place all the first end surfaces against the end surface of the flange, fold up the overlapping parts, and connect the stickers so that the protruding parts are adhered to the outer end surface of the gasket and the end surface of the flange, with the outer end surface parallel to the inner ring of the flange;

[0024] Fit one end of the latter gasket combination without the overlapping portion to one end of the overlapping portion of the former gasket combination, all the arc surfaces of the bosses in the latter gasket combination are abutted against the inner ring of the flange, all the first end faces are abutted against the flange end faces, fold up the overlapping portion, and connect the stickers so that the protruding portion is bonded to the outer end face and the flange end face.

[0025] In some possible implementations, when performing internal fillet welding on a flange and a pipe, the steps include:

[0026] The first weld is made based on the end face of the boss;

[0027] The second weld is made based on the first weld.

[0028] In some possible implementations, after performing internal fillet welding on the flange and the pipe, the method further includes:

[0029] Perform outside fillet welds on flanges and pipes.

[0030] Beneficial effects of the present invention:

[0031] The present invention provides a flange-to-pipe welding auxiliary device and welding method. Before welding, a boss is inserted into the flange, and the boss end face on the side of the boss facing away from the base block faces the pipe end face. The first end face abuts the flange end face, and the boss arc face abuts the flange inner ring of the flange, thereby limiting the gasket and flange and ensuring installation accuracy. The distance between the flange end face and the boss end face is a preset distance. During welding, the boss end face can serve as a welding datum and reference, reducing welding difficulty and avoiding starting welding from the side of the irregularly shaped pipe end face, which results in uneven distance between the inner fillet weld of the pipe and flange and the flange end face, with partial protrusion of the flange end face, thereby improving the straightness and forming quality of the weld. In addition, the welding auxiliary device also has a certain mold function, ensuring welding straightness and height difference. The boss end face can prevent liquid metal from flowing to the flange end face, causing weld nodules or welds protruding from the flange end face. The welding current can be appropriately increased to improve the deposition efficiency. The welding operation is easy and the welding efficiency is high.

[0032] The present invention provides a method for welding a flange to a pipe. By using the aforementioned welding auxiliary device, the welding auxiliary device is first assembled, and then welding is performed. During welding, the boss end face can be used as a welding base and reference, reducing welding difficulty and improving welding efficiency. It avoids starting welding from one side of an irregularly shaped pipe end face, which results in an uneven distance between the inner fillet weld of the pipe and flange and the flange end face, with the weld partially extending beyond the flange end face, thereby improving the straightness and forming quality of the weld. In addition, the welding auxiliary device also has a certain mold function, ensuring welding straightness and height difference. The boss end face can prevent liquid metal from flowing to the flange end face, causing weld nodules or welds extending beyond the flange end face. The welding current can be appropriately increased to improve the deposition efficiency. The welding operation is easy and the welding efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the assembly of flange and steel pipe in the prior art;

[0034] Figure 2 yes Figure 1 AA cross-section of

[0035] Figure 3 This is a cross-sectional view of a flange and a steel pipe after welding in the prior art;

[0036] Figure 4 It is a schematic diagram of the assembly of the flange, pipe and welding auxiliary device provided by a specific embodiment of the present invention;

[0037] Figure 5 yes Figure 4 BB cross-section diagram;

[0038] Figure 6This is a cross-sectional view of a flange and a pipe after welding provided by a specific embodiment of the present invention;

[0039] Figure 7 is a schematic diagram of a pad at one viewing angle provided by a specific embodiment of the present invention;

[0040] Figure 8 is a schematic diagram of a pad from another perspective provided by a specific embodiment of the present invention;

[0041] Figure 9 is a schematic diagram of an arrangement of multiple pads at one viewing angle provided by a specific embodiment of the present invention;

[0042] Figure 10 is a schematic diagram of an adhesive assembly provided by a specific embodiment of the present invention;

[0043] Figure 11 is a schematic diagram of an adhesive assembly and a plurality of pads provided in a specific embodiment of the present invention;

[0044] Figure 12 is a schematic diagram of an arrangement of multiple pads from another perspective provided by a specific embodiment of the present invention;

[0045] Figure 13 is a schematic diagram of a first adhesive layer provided in a specific embodiment of the present invention;

[0046] Figure 14 is a schematic diagram of a first adhesive layer and a plurality of pads provided in a specific embodiment of the present invention;

[0047] Figure 15 The figure is a flow chart of a flange and pipe welding method provided by a specific embodiment of the present invention.

[0048] In the picture:

[0049] 100', flange; 200', steel pipe; 300', first weld;

[0050] 100, flange; 101, flange end face; 102, flange inner ring;

[0051] 200, tube; 201, tube end face;

[0052] 300, inner fillet weld; 301, first weld; 302, second weld; 303, third weld;

[0053] 400, external fillet weld;

[0054] 1. Gasket; 11. Base block; 111. First end surface; 112. Outer end surface; 113. Second end surface; 114. Side surface; 12. Boss; 121. Boss end surface; 122. Boss arc surface; 123. Inner arc surface;

[0055] 2. First bonding layer;

[0056] 3. Paste assembly; 31. Connecting portion; 32. Overlapping portion; 33. Protruding portion;

[0057] H. Preset distance. DETAILED DESCRIPTION

[0058] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0059] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and 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 the present invention in specific circumstances.

[0060] 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. Furthermore, 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.

[0061] This embodiment provides a flange and pipe welding auxiliary device, such as Figure 4-Figure 8As shown, when the flange 100 and the pipe 200 are assembled, the flange 100 is sleeved on the outer circumference of the pipe 200, the flange end face 101 of the flange 100 is spaced apart from the pipe end face 201 of the pipe 200, and an inner fillet weld 300 is provided between the pipe end face 201 and the flange inner ring 102 of the flange 100. A distance H is preset between the inner fillet weld 300 and the flange end face 101 so that the inner fillet weld 300 does not extend beyond the flange end face 101. The welding auxiliary device includes a gasket 1 with an L-shaped cross-section. The gasket 1 includes a base block 11 and a boss 12 protruding from a first end face 111 of the base block 11. The first end face 111 is used to abut the flange end face 101. The boss 12 is used to extend into the flange 100, and the boss end face 121 of the boss 12 facing away from the base block 11 is directed toward the pipe end face 201. The distance between the flange end face 101 and the boss end face 121 is a preset distance H. The boss arc surface 122 of the boss 12 is used to abut the flange inner ring 102 of the flange 100, and the shape of the boss arc surface 122 is adapted to the shape of the flange inner ring 102.

[0062] Before welding, the boss 12 is inserted into the flange 100, with the boss end face 121 of the boss 12 facing away from the base block 11 toward the pipe end face 201. The first end face 111 abuts the flange end face 101, and the boss arc surface 122 abuts the flange inner ring 102 of the flange 100, thereby limiting the position of the gasket 1 and the flange 100 and ensuring installation accuracy. The distance between the flange end face 101 and the boss end face 121 is a preset distance H. During welding, the boss end face 121 can serve as a welding benchmark and reference, reducing welding difficulty and improving welding efficiency. It avoids starting welding from the side of the irregularly shaped pipe end face 201, which would result in an uneven distance between the inner fillet weld 300 of the pipe 200 and the flange 100 and the flange end face 101, with some parts exceeding the flange end face 101, thereby improving the straightness and forming quality of the weld. In addition, the welding auxiliary device also has a certain mold function to ensure the straightness and height difference of the welding. The boss end face 121 can stop the liquid metal from flowing to the flange end face 101 and causing weld nodules or welds to extend beyond the flange end face 101. The welding current can be appropriately increased to improve the deposition efficiency. The welding operation is easy and the welding efficiency is high.

[0063] Further, if Figure 7 and Figure 8 As shown, the boss 12 is provided with an inner arc surface 123, which is opposite to the boss arc surface 122 and parallel to the flange inner ring 102, so that all gaskets 1 are neatly and beautifully installed. The distance between the inner arc surface 123 and the flange inner ring 102 is consistent, that is, the thickness of the boss end surface 121 is uniform and serves as a reference for the height of the inner fillet weld 300. The thickness of the boss end surface 121 is the same as the height of the inner fillet weld 300.

[0064] Specifically, the pipe 200 may be a steel pipe.

[0065] Further, if Figure 5 As shown, the preset distance H can be 1-2 mm, which can be set according to needs and is not limited.

[0066] Furthermore, welding is performed using CO2 gas shielded welding with E501-1 carbon steel flux-cored wire (diameter 1.2 mm), with requirements of CO2 gas purity ≥ 99.5%, welding current 180-220 A, and welding voltage 26-28 V. Other embodiments can be configured as required and are not limited thereto.

[0067] In one embodiment, the liner 1 is made of a high temperature resistant material to prevent the liner 1 from melting or deforming during welding. Furthermore, the liner 1 is made of a ceramic material. Furthermore, the base block 11 and the boss 12 can be an integral structure or a separate structure, without limitation.

[0068] In one embodiment, if Figure 13 and Figure 14 As shown, a first bonding layer 2 is provided on the first end face 111 and the boss arc surface 122 , and the boss arc surface 122 abuts against the flange inner ring 102 , and is bonded by the first bonding layer 2 to prevent displacement during welding and improve reliability.

[0069] In one embodiment, if Figure 7 、 Figure 8 、 Figure 12-14 As shown, the base block 11 further includes an outer end face 112 and a second end face 113. The second end face 113 is opposite the first end face 111, and the outer end face 112 is parallel to the flange inner ring 102. The first end face 111 and the second end face 113 are fan-shaped. One or more gaskets 1 are placed on the flange 100 as needed to assist in welding. The number of gaskets 1 required and their placement can be determined based on the welding dimensions of the flange 100. The gaskets 1 can be used with flanges 100 of various diameters, providing good applicability. In other embodiments, the gaskets 1 can be customized based on the size of the flange 100. Specifically, multiple gaskets 1 can be pre-arranged as needed, and then the first adhesive layer 2 can be bonded to the first end face 111.

[0070] In one embodiment, if Figure 7-11As shown, the welding auxiliary device also includes an adhesive component 3, which includes a second adhesive layer and a sticker. The second adhesive layer is bonded between the pad 1 and the sticker, and the sticker can be peeled off from the second adhesive layer. The adhesive component 3 is fan-shaped; the adhesive component 3 includes a connecting portion 31, an overlapping portion 32 and a protruding portion 33. The connecting portion 31 is bonded to the second end face 113; the overlapping portion 32 is connected to the connecting portion 31, and the overlapping portion 32 extends from the side face 114 of the base block 11 along the circumference of the flange 100; the protruding portion 33 is connected to the connecting portion 31, and the protruding portion 33 extends from the base block 11 and can be bent to bond to the outer end face 112 and the flange end face 101. When multiple gaskets 1 are required on the flange 100, the gaskets 1 are connected to adjacent gaskets 1 by overlapping portions 32 to prevent displacement of adjacent gaskets 1. The gaskets 1 are connected to the flange end face 101 by protruding portions 33, further preventing displacement of the gaskets 1 relative to the flange 100 and ensuring a reliable connection between the gaskets 1 and the flange 100. Specifically, the adhesive component 3 is tin foil with glue.

[0071] In one embodiment, the welding auxiliary device includes multiple gaskets 1 arranged along the circumference of flange 100, with the bosses 12 of adjacent gaskets 1 abutting against each other. The multiple gaskets 1 are bonded together by an adhesive assembly 3 to form a gasket assembly. The adhesive assembly 3 extends from a side surface 114 of the gasket 1 at one end. As needed, the multiple gaskets 1 can be pre-arranged and bonded together by the adhesive assembly 3 to form a gasket assembly, thereby improving the efficiency of attaching the gaskets 1 to flange 100.

[0072] Furthermore, the first end face 111 and the second end face 113 are fan-shaped, and multiple gaskets 1 are closely arranged and combined to ensure that their boss arc surfaces 122 are consistent with the flange inner ring 102. After all gaskets 1 are installed along the circumference of the flange 100, all first end faces 111 are annular and fully contact the flange end face 101. Glue is used to form a first adhesive layer 2 to adhere to the flange end face 101, and all second end faces 113 can be fixed with annular tin foil.

[0073] Furthermore, the outer end face 112 is parallel to the flange inner ring 102. When the flange 100 is circular, the outer end face 112 is an arc surface. After all the gaskets 1 are installed, they are neat and beautiful, which facilitates the bonding of the pasting components 3 during the installation process of all the gaskets 1.

[0074] Furthermore, the two side surfaces 114 of the gasket 1 along the circumference of the flange 100 are flat, which facilitates full contact between the gaskets 1 and ensures firm installation and fixation.

[0075] In one embodiment, a plurality of pads 1 may be connected by using a first adhesive layer 2 and an adhesive component 3. The number of pads 1 is set according to needs, such as three, four or five, etc., without limitation.

[0076] This embodiment also provides a method for welding a flange to a pipe, such as Figure 4-Figure 6 and Figure 15 As shown, the flange 100 and the pipe 200 are welded by the above-mentioned flange and pipe welding auxiliary device. The flange and pipe welding method includes:

[0077] S100, installing the welding auxiliary device on the flange 100, so that the boss 12 of the gasket 1 extends into the flange 100, the boss arc surface 122 abuts against the flange inner ring 102 of the flange 100, and the first end face 111 abuts against the flange end face 101;

[0078] S200 , performing an inner fillet weld 300 on the flange 100 and the pipe 200 , welding the flange inner ring 102 and the pipe end face 201 with the boss end face 121 as a reference.

[0079] The boss end face 121 can serve as a welding datum and reference, reducing welding difficulty and improving welding efficiency. It avoids starting welding from one side of the irregularly shaped pipe end face 201, which would result in an uneven distance between the inner fillet weld 300 between the pipe 200 and the flange 100 and the flange end face 101, with the weld partially extending beyond the flange end face 101. This improves the straightness and quality of the weld. Furthermore, the welding auxiliary device also functions as a mold to ensure weld straightness and height differences. The boss end face 121 can prevent liquid metal from flowing onto the flange end face 101, which could cause weld nubs or welds extending beyond the flange end face 101. This allows for appropriate increases in welding current and improves deposition efficiency. The welding operation is simple and efficient.

[0080] In one embodiment, when welding the flange 100 and the pipe 200 with the internal fillet weld 300, the process includes:

[0081] S201, performing a first weld 301 with the boss end surface 121 as a reference;

[0082] S202 , welding the second weld 302 based on the first weld 301 .

[0083] The first weld 301 is based on the boss end face 121, and its weld straightness, height difference, and forming quality are good. The second weld 302 is welded with the first weld 301 as the reference, effectively preventing all welds from bending and unevenness, and improving the overall weld forming quality, thereby improving the quality of the inner fillet weld 300.

[0084] Furthermore, when welding the flange 100 and the pipe 200 with the inner fillet weld 300, the following steps are also included:

[0085] S203, then the third weld 303 is welded based on the second weld 302 (until the pipe end face 201 is completely welded and covered). Specifically, multiple welds can be set, all welded based on the previous weld, and the number of welds is not limited.

[0086] In one embodiment, after performing the internal fillet weld 300 on the flange 100 and the pipe 200, the method further includes:

[0087] S300 , performing external fillet weld 400 on flange 100 and pipe 200 .

[0088] Compared with the prior art, the welding order of the inner fillet weld 300 and the outer fillet weld 400 between the pipe 200 and the flange 100 is clarified, that is, the inner fillet weld 300 between the pipe 200 and the flange 100 is welded first, which effectively prevents the flatness of the flange 100 from being excessively deformed after the pipe 200 and the flange 100 are welded (the flange end face 101 is tilted and deformed in the length direction of the pipe 200).

[0089] In one embodiment, after performing the internal fillet weld 300 on the flange 100 and the pipe 200, the method further includes:

[0090] S400: dismantle and clean the welding auxiliary device to facilitate subsequent recycling of the welding auxiliary device.

[0091] In one embodiment, a first adhesive layer 2 is provided on the first end surface 111 and the boss arc surface 122. When the welding auxiliary device is installed on the flange 100, the following steps are included:

[0092] S101, extending the boss 12 into the flange 100, and making the first end face 111 abut against the flange end face 101;

[0093] S102, pushing the gasket 1 so that the boss arc surface 122 abuts against the flange inner ring 102;

[0094] S103 , pressing the gasket 1 so that the gasket 1 is bonded to the flange 100 .

[0095] The first end face 111 is tightly fitted and fixed to the flange end face 101 , and the boss arc surface 122 is tightly fitted and fixed to the flange inner ring 102 , thereby improving the connection accuracy and reliability between the gasket 1 and the flange 100 .

[0096] In one embodiment, the welding auxiliary device includes an adhesive component 3, and multiple gaskets 1 are bonded together by the adhesive component 3 to form a gasket assembly. When the multiple gasket assemblies are installed on the flange 100, the following steps are included:

[0097] S110. Place all the boss arc surfaces 122 of the previous gasket assembly against the flange inner ring 102, place all the first end surfaces 111 against the flange end surface 101, fold up the overlapping portion 32, and connect the stickers so that the protruding portion 33 adheres to the outer end surface 112 of the gasket 1 and the flange end surface 101, with the outer end surface 112 parallel to the flange inner ring 102.

[0098] S120. Fit one end of the latter gasket combination without the overlapping portion 32 to one end of the overlapping portion 32 of the former gasket combination, all the boss arc surfaces 122 of the latter gasket combination abut against the flange inner ring 102, all the first end faces 111 abut against the flange end face 101, fold up the overlapping portion 32, and connect the stickers so that the protruding portion 33 is bonded to the outer end face 112 and the flange end face 101.

[0099] Specifically, the first adhesive layer 2 is a double-sided tape with glossy paper on the outside. After the tube 200 and the flange 100 are assembled, the glossy paper of the double-sided tape on the first end face 111 of the previous gasket combination is torn off, and all the boss arc surfaces 122 of the gasket combination are fully in contact with the flange inner ring 102. The gasket combination is pushed backward from the front to ensure that the first end faces 111 of all gaskets 1 are in full contact and pressed tightly with the flange end face 101, and firmly pasted and fixed. Then, the glossy paper such as stickers of the pasting component 3 such as tinfoil is torn off, the tinfoil of the overlapping part 32 is bent forward and folded up, and the tinfoil of the protruding part 33 is firmly pasted to the flange end face 101 to complete the fixed installation of the previous gasket combination.

[0100] Tear off the glossy paper of the double-sided tape on the first end face 111 of the rear gasket assembly, move the rear gasket assembly close to the previous gasket assembly, make all the boss arc surfaces 122 of the rear gasket assembly fully contact with the flange inner ring 102, push the rear gasket assembly backward from the front, ensure that the first end faces 111 of all ceramic gaskets 1 are fully in contact with the flange end face 101 and pressed tightly, firmly stick and fix them, then tear off the glossy paper on the tin foil, stick the overlapping part 32 and the previous gasket assembly into one, stick the protruding part 33 to the flange end face 101 firmly, and complete the fixed installation of the rear gasket assembly.

[0101] All other gasket assemblies are installed using the same method as described above for the last gasket assembly, forming a secure, complete annular welding auxiliary device at the end of flange 100. If the remaining space is insufficient to install a complete gasket assembly, the gasket assembly can be disassembled into individual gaskets 1 for installation as needed.

[0102] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. 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 flange and pipe welding auxiliary device, wherein a flange (100) is sleeved on the outer circumference of a pipe (200), a flange end face (101) of the flange (100) and a pipe end face (201) of the pipe (200) are spaced apart, an inner fillet weld (300) is provided between the pipe end face (201) and the flange inner ring (102) of the flange (100), a preset distance (H) between the inner fillet weld (300) and the flange end face (101) is set so that the inner fillet weld (300) does not exceed the flange end face (101), and is characterized in that: The welding auxiliary device includes a gasket (1) with an L-shaped cross-section, the gasket (1) including a base block (11) and a boss (12) protruding from a first end face (111) of the base block (11), the first end face (111) being used to abut against the flange end face (101), the boss (12) being used to extend into the flange (100), and the boss end face (121) of the boss (12) facing away from the base block (11) facing the pipe end face (201), the distance between the flange end face (101) and the boss end face (121) being a preset distance (H), the boss arc surface (122) of the boss (12) being used to abut against the flange inner ring (102), and the shape of the boss arc surface (122) being adapted to the shape of the flange inner ring (102).

2. The flange and pipe welding auxiliary device according to claim 1, characterized in that: A first adhesive layer (2) is provided on the first end surface (111) and the boss arc surface (122).

3. The flange and pipe welding auxiliary device according to claim 1, characterized in that: The base block (11) further includes an outer end face (112) and a second end face (113), wherein the second end face (113) is opposite to the first end face (111), the outer end face (112) is parallel to the flange inner ring (102), and the first end face (111) and the second end face (113) are fan-shaped.

4. The flange and pipe welding auxiliary device according to claim 3, characterized in that: The welding auxiliary device further comprises an adhesive component (3), the adhesive component (3) comprising a second adhesive layer and a sticker, the second adhesive layer being bonded between the pad (1) and the sticker, the sticker being capable of being peeled off from the second adhesive layer, and the adhesive component (3) being fan-shaped; the adhesive component (3) comprising: A connecting portion (31) bonded to the second end surface (113); an overlapping portion (32) connected to the connecting portion (31), wherein the overlapping portion (32) extends from a side surface (114) of the base block (11) along the circumference of the flange (100); A protruding portion (33) is connected to the connecting portion (31), and the protruding portion (33) extends from the base block (11) and can be bent to be bonded to the outer end surface (112) and the flange end surface (101).

5. The flange and pipe welding auxiliary device according to claim 4, characterized in that: The invention comprises a plurality of gaskets (1), wherein the plurality of gaskets (1) are arranged along the circumference of the flange (100), the bosses (12) of two adjacent gaskets (1) are fitted together, and the plurality of gaskets (1) are bonded together by the adhesive component (3) to form a gasket combination, and the adhesive component (3) extends out from the side surface (114) of the gasket (1) at one end.

6. A method for welding a flange to a pipe, characterized in that: The flange (100) and the pipe (200) are welded by the flange and pipe welding auxiliary device according to any one of claims 1 to 5. The flange and pipe welding method includes: The welding auxiliary device is installed on the flange (100), so that the boss (12) of the gasket (1) extends into the flange (100), the boss arc surface (122) abuts against the flange inner ring (102) of the flange (100), and the first end surface (111) abuts against the flange end surface (101); The flange (100) and the pipe (200) are welded with an inner fillet weld (300), and the flange inner ring (102) and the pipe end face (201) are welded with the boss end face (121) as a reference.

7. The flange and pipe welding method according to claim 6, characterized in that: A first adhesive layer (2) is provided on the first end surface (111) and the boss arc surface (122). When the welding auxiliary device is installed on the flange (100), it includes: The boss (12) is extended into the flange (100), and the first end surface (111) is abutted against the flange end surface (101); Pushing the gasket (1) so that the boss arc surface (122) abuts against the flange inner ring (102); The gasket (1) is pressed tightly so that the gasket (1) is bonded to the flange (100).

8. The flange and pipe welding method according to claim 6, characterized in that: The welding auxiliary device comprises an adhesive component (3), wherein a plurality of gaskets (1) are bonded together by the adhesive component (3) to form a gasket assembly. When the plurality of gasket assemblies are mounted on a flange (100), the device comprises: All the boss arc surfaces (122) in the previous gasket assembly are abutted against the flange inner ring (102), all the first end faces (111) are abutted against the flange end face (101), the overlapping portion (32) is folded up, and the stickers are connected so that the protruding portion (33) is adhered to the outer end face (112) of the gasket (1) and the flange end face (101), and the outer end face (112) is parallel to the flange inner ring (102); The end of the latter gasket combination without the overlapping portion (32) is fitted to the end of the overlapping portion (32) of the former gasket combination, all the boss arc surfaces (122) in the latter gasket combination are abutted against the flange inner ring (102), all the first end faces (111) are abutted against the flange end face (101), the overlapping portion (32) is folded up, and the stickers are connected so that the protruding portion (33) is adhered to the outer end face (112) and the flange end face (101).

9. The flange and pipe welding method according to claim 6, characterized in that: When welding an internal fillet weld (300) between a flange (100) and a pipe (200), the following steps are included: Performing a first weld (301) with the boss end surface (121) as a reference; The second weld (302) is welded based on the first weld (301).

10. The flange and pipe welding method according to any one of claims 6 to 9, characterized in that: After welding the flange (100) and the pipe (200) with an inner fillet weld (300), the method further comprises: The flange (100) and the pipe (200) are welded with an external fillet weld (400).

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