Method for calculating length of tee intersection weld and method for cutting tee branch pipe

Abstract

The application discloses a tee branch pipe intersection line weld length calculation method and a tee branch pipe blanking method, and relates to the tee production field.The method comprises the following steps: determining the sizes of a tee main pipe and a tee branch pipe, and performing three-view lofting on the tee main pipe and the tee branch pipe; performing N-equivalent lofting and detailing on the tee branch pipe to obtain a left view, a front view and a top view; determining 1+N / 4 reference detailed points which determine the intersection line shape in the front view; using the corresponding relationship between the front view and the left view and the front view and the top view, and based on the Pythagorean theorem and trigonometric functions, a vertical height expression of the reference detailed points to the branch pipe end face is obtained; and based on the vertical height expression of the reference detailed points to the branch pipe end face, the tee branch pipe intersection line weld length is calculated.The application can accurately perform tee branch pipe intersection line weld length calculation and branch pipe blanking, has small influence on the network, signal and equipment, greatly facilitates the construction needs of the field construction personnel under special circumstances, and can also be used for calculating the intersection line length, the actual weight of the branch pipe and the waste in the branch pipe processing process.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tee production, in particular to a tee intersecting line weld length calculation method and a tee branch pipe blanking method. BACKGROUND

[0002] The statements in this section merely provide background information related to the application and do not necessarily constitute prior art.

[0003] When a mechanical part is composed of two or more basic solids, the intersection of the two solids will occur, which is called two-solid intersection. The intersection line formed by the surfaces of the two solids is called intersecting line, which is commonly used in engineering construction.

[0004] A tee is composed of a main pipe and a branch pipe. When a tee is processed and welded, a hole is generally cut at a specified position of the main pipe according to the calculated size, and then the branch pipe is welded, or the branch pipe is welded to the main pipe after completion, and then the main pipe is cut. The branch pipe is processed using pipe material or plate material. If the blanking of the branch pipe is not accurate enough, it will cause the main pipe and the branch pipe to be not tightly fitted, increasing the difficulty of welding, and if the main pipe and the branch pipe are not fitted, it will also cause waste of pipe material or plate material.

[0005] The intersection position of the branch pipe and the main pipe is the intersecting line of the two, which is an irregular curved surface of the branch pipe plate. In the above tee manufacturing process, how to determine the intersecting line of the tee and then determine the appropriate branch pipe development size and blanking according to the development size of the branch pipe is a very important link in the manufacturing of the tee.

[0006] For common types of tees (such as equal-diameter tees, unequal-diameter tees, inclined tees, and sludge discharge tees), computer three-dimensional software such as SolidWorks, UG, Proe, and CATIA can be used to assist in determining the intersecting line after mapping, but it requires certain professional personnel to operate, and due to software copyright issues, the practicality is low. At the same time, it is found in research that the weld length of the tee intersecting line is closely related to the blanking size of the branch pipe. Currently, the blanking size of the branch pipe can be lofted using computer two-dimensional software such as AUTOCAD and CAXA, but the workload is large and the efficiency is low; if some computer or mobile phone APP sheet metal CAD blanking software is used, the standardization degree is low, secondary calculation is required, and it is greatly affected by network, signal, and equipment, and such software has no direct weld length calculation function.

[0007] The inventor found that in some special situations, such as in foreign countries or deserts, there is no signal for mobile phones and no computer can be configured, and the above related auxiliary tools cannot be used, at which time how to accurately determine the blanking of the branch pipe becomes a big problem for construction. SUMMARY

[0008] The present application aims to provide a tee pipe intersecting line weld length calculation method and a tee pipe branch pipe blanking method, and solve the technical problem of how to accurately perform branch pipe blanking in some special situations, such as foreign countries, deserts and other areas, where mobile phones have no signal and cannot be configured with computers, and related auxiliary tools cannot be used, the operation is simple, the network, signal and equipment have little influence, and the present application truly realizes the foolproof blanking, greatly facilitates the construction needs of the site construction personnel in special situations, and solves the problems in the prior art.

[0009] To solve the above technical problems, the present application is realized by the following technical scheme:

[0010] The present application provides a tee pipe intersecting line weld length calculation method in the first aspect.

[0011] A tee pipe intersecting line weld length calculation method, comprising the following steps:

[0012] Determine the size of the tee pipe main pipe and the tee pipe branch pipe, and perform three-view lofting on the tee pipe main pipe and the tee pipe branch pipe to obtain the left view, the front view and the top view of the tee pipe;

[0013] Perform N-equidivision lofting refinement on the tee pipe branch pipe to obtain the left view, the front view and the top view of the tee pipe after lofting refinement, wherein N is a multiple of 4;

[0014] Determine 1+N / 4 reference refinement points capable of determining the shape of the intersecting line in the front view;

[0015] Based on the corresponding relationship between the front view and the left view and the front view and the top view, obtain the vertical height expression of each reference refinement point to the branch pipe end face based on the Pythagorean theorem and the trigonometric function;

[0016] Calculate the tee pipe intersecting line weld length based on the vertical height expression of each reference refinement point to the branch pipe end face.

[0017] Preferably, the size of the tee pipe main pipe and the tee pipe branch pipe comprises the main pipe outer diameter 2R1, the branch pipe outer diameter 2R2, the wall thickness μ and the distance H from the branch pipe end face to the main pipe center.

[0018] Preferably, the tee pipe branch pipe is subjected to N-equidivision lofting refinement to obtain the left view, the front view and the top view of the tee pipe after lofting refinement, and the specific steps are as follows:

[0019] In the top view, the tee pipe branch pipe is equally divided into N parts along the circumferential direction to obtain N equidivision points;

[0020] Project the N equidivision points obtained in the top view to the front view to obtain 1+N / 2 front view projection points;

[0021] Projecting the 1+N / 2 main view projection points in the main view into the left view, 1+N / 2 left view projection points are obtained, and the left view, the main view and the top view of the lofted and refined tee are obtained.

[0022] Preferably, 1+N / 4 reference refinement points capable of determining the shape of the intersecting line are determined in the main view, specifically: 1+N / 4 equidistant points on the path of the intersecting line of the tee branch pipe in the main view from the single lowest point to the highest point are taken as the reference refinement points.

[0023] Preferably, based on the Pythagorean theorem and trigonometric functions, the vertical height expression of each reference refinement point to the branch pipe end face is obtained by using the corresponding relationship between the main view and the left view and the corresponding relationship between the main view and the top view, specifically:

[0024] Based on the Pythagorean theorem, the vertical height expression of each reference refinement point to the branch pipe end face and the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe are obtained by using the corresponding relationship between the main view and the left view;

[0025] Based on trigonometric functions, the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe and the branch pipe inner diameter are obtained by using the corresponding relationship between the main view and the top view.

[0026] Preferably, in the left view, the vertical height expression of each reference refinement point to the branch pipe end face and the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe are:

[0027] L n = H-D 1n

[0028]

[0029] wherein, Ln is the vertical height of the n th reference refinement point to the branch pipe end face; H is the distance from the branch pipe end face to the center of the main pipe; D 1n is the vertical distance from the left view projection point of the n th reference refinement point to the center of the tee main pipe, D 2n is the horizontal projection distance of the left view projection point of the n th reference refinement point to the center of the tee main pipe, and R1 is the main pipe radius.

[0030] Preferably, in the top view, the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe and the branch pipe inner diameter are:

[0031]

[0032] wherein, represents the included angle between the line connecting the n th reference refinement point and the center of the tee branch pipe and the center line of the main pipe in the top view.

[0033] Preferably, the branch pipe unfolding length is calculated according to the diameter of the branch pipe, the circumference of the branch pipe is π*(2R2-μ), and the width of each equal part after N equal division of the tee branch pipe is π*(2R2-μ) / N; and the expression of the length L of the tee branch pipe intersecting line weld is:

[0034]

[0035]

[0036] The second aspect of the present application provides a tee branch pipe blanking method based on the tee branch pipe intersecting line weld length calculation method of the first aspect.

[0037] A tee branch pipe blanking method based on the tee branch pipe intersecting line weld length calculation method of the first aspect, based on the obtained tee branch pipe intersecting line weld length, an EXCEL form is designed, and when used, the EXCEL form is opened by using a mobile phone version of office or wps, or the EXCEL form is made into an app and installed on a mobile phone, so that the tee branch pipe blanking can be performed under the condition of no signal and no computer.

[0038] Preferably, if the branch pipe is a steel plate blanking process, the plate after blanking is directly rolled and processed into a tee branch pipe; if the branch pipe is a steel pipe blanking, a suitable material is selected to cut out the blanking size and cover the outer wall of the steel pipe to draw a line and then cut.

[0039] The present application has the following beneficial effects:

[0040] 1. The present application provides a tee branch pipe intersecting line weld length calculation method and a tee branch pipe blanking method, which can solve the technical problems of how to accurately calculate the tee branch pipe intersecting line weld length and blank the tee branch pipe under some special conditions, such as foreign countries, deserts and other areas, where there is no signal on the mobile phone, no computer can be configured, and related auxiliary tools cannot be used, and the operation is simple, the influence of network, signal and equipment is small, and the real dumb down blanking greatly facilitates the construction needs of the site construction personnel under special circumstances.

[0041] 2. The tee branch pipe intersecting line weld length calculation method provided by the present application can avoid the dependence on computer three-dimensional software such as SolidWorks, UG, Proe and CATIA, and does not need to use computer two-dimensional software such as AUTOCAD and CAXA for lofting, so that even related personnel who cannot use drawing software can also operate conveniently, and the applicability is strong.

[0042] 3. The present application can improve the work efficiency of the tee branch pipe blanking, and solves the problems of large workload and low efficiency when using AUTOCAD, CAXA and other computer two-dimensional software for lofting in the prior art.

[0043] Of course, implementing any product of the application does not necessarily require achieving all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0045] Fig. 1(a) is a schematic diagram of the form of the tee branch pipe placement type welded joint of the present application;

[0046] Fig. 1(b) is a schematic diagram of the form of the tee branch pipe insertion type welded joint of the present application;

[0047] Fig. 2(a) is a schematic diagram of the tee branch pipe pipe material blanking processing of the present application;

[0048] Fig. 2(b) is a schematic diagram of the tee branch pipe plate material blanking processing of the present application;

[0049] Figure 3 Fig. 3 is a front view and a right view of the eccentric tee of the present application;

[0050] Figure 4 Fig. 4 is a front view and a right view of the eccentric inclined tee of the present application;

[0051] Figure 5 Fig. 5 is a front view and a right view of the sludge discharge tee of the present application;

[0052] Figure 6 Fig. 6 is a left view, a front view and a top view of the eccentric tee of the present application;

[0053] Figure 7 Fig. 7 is a left view, a front view and a top view of the eccentric tee after lofting refinement of the present application;

[0054] Figure 8 Fig. 8 is a schematic diagram of the general structure of the steel plate blanking of the present application;

[0055] Figure 9 Fig. 9 is a schematic diagram of the placement type (equal) eccentric tee branch pipe blanking size and weld length Ecce l design of the present application;

[0056] Figure 10 Fig. 10 is a flow chart of the tee intersecting line weld length calculation method of the present application. DETAILED DESCRIPTION

[0057] With reference to the drawings and embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0058] Embodiment one:

[0059] The embodiment provides a tee pipe intersecting line weld length calculation method.

[0060] Referring to Figure 10 A tee pipe intersecting line weld length calculation method comprises the following steps:

[0061] A tee pipe intersecting line weld length calculation method comprises the following steps:

[0062] Determine the size of the tee main pipe and the tee branch pipe, and perform three-view lofting on the tee main pipe and the tee branch pipe to obtain a left view, a front view and a top view of the tee pipe;

[0063] Perform N-equidivision lofting refinement on the tee branch pipe to obtain a left view, a front view and a top view of the tee pipe after lofting refinement, wherein N is a multiple of 4;

[0064] Determine 1+N / 4 reference refinement points capable of determining the shape of the intersecting line in the front view;

[0065] Based on the Pythagorean theorem and trigonometric functions, a vertical height expression of each reference refinement point to the branch pipe end face is obtained by using the corresponding relationship between the front view and the left view and the front view and the top view;

[0066] Based on the vertical height expression of each reference refinement point to the branch pipe end face, the tee pipe intersecting line weld length is calculated.

[0067] Further, the size of the tee main pipe and the tee branch pipe comprises a main pipe outer diameter 2R1, a branch pipe outer diameter 2R2, a wall thickness μ, and a branch pipe end face to main pipe center distance H.

[0068] Further, the N-equidivision lofting refinement is performed on the tee branch pipe to obtain a left view, a front view and a top view of the tee pipe after lofting refinement, and specifically:

[0069] In the top view, the tee branch pipe is equally divided into N parts along the circumferential direction to obtain N equidivision points;

[0070] The N equidivision points obtained in the top view are projected into the front view to obtain 1+N / 2 front view projection points;

[0071] Projecting the 1+N / 2 main view projection points in the main view into the left view, 1+N / 2 left view projection points are obtained, and the left view, the main view and the top view of the lofted and refined tee are obtained.

[0072] Further, 1+N / 4 reference refinement points capable of determining the shape of the intersecting line are determined in the main view, specifically: 1+N / 4 equidistant points on the path of the intersecting line of the tee branch pipe in the main view from the single lowest point to the highest point are taken as the reference refinement points.

[0073] Further, using the corresponding relationship between the main view and the left view and the corresponding relationship between the main view and the top view, the vertical height expression of each reference refinement point to the branch pipe end face is obtained based on the Pythagorean theorem and the trigonometric function, specifically:

[0074] Using the corresponding relationship between the main view and the left view, based on the Pythagorean theorem, the expression of the vertical height of each reference refinement point to the branch pipe end face and the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe is obtained;

[0075] Using the corresponding relationship between the main view and the top view, based on the trigonometric function, the expression of the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe and the branch pipe inner diameter is obtained.

[0076] Further, in the left view, the expression of the vertical height of each reference refinement point to the branch pipe end face and the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe is:

[0077] L n =H-D 1n

[0078]

[0079] wherein, Ln is the vertical height of the n th reference refinement point to the branch pipe end face; H is the distance from the branch pipe end face to the main pipe center; D 1n is the vertical distance of the left view projection point of the n th reference refinement point to the center of the tee main pipe, D 2n is the horizontal projection distance of the left view projection point of the n th reference refinement point to the center of the tee main pipe, and R1 is the main pipe radius.

[0080] Further, in the top view, the expression of the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe and the branch pipe inner diameter is:

[0081]

[0082] wherein, represents the included angle between the line connecting the n th reference refinement point and the center of the tee branch pipe and the main pipe center line in the top view.

[0083] Further, the branch pipe unfolding length is calculated according to the diameter of the branch pipe, the circumference of the branch pipe is pi*(2R2-mu), and the width of each equal part after the tee branch pipe is equally divided by N is pi*(2R2-mu) / N; and the expression of the tee branch line welding length L is:

[0084]

[0085] Specifically, the welding joint forms of the tee branch pipe and the main pipe are mainly the placing type and the inserting type, as shown in Figures 1(a) and 1(b), and both types are fully demonstrated in the research process.

[0086] For the processing mode of the branch pipe, there are two kinds of steel plate rolling processing and steel pipe blanking processing, as shown in Figures 2(a) and 2(b), and the content of the application is applicable to both blanking modes.

[0087] The application takes three most commonly used tees, Figures 3-5 as examples, and the placing type welding joint form is used to describe the technical scheme of the embodiment.

[0088] Taking the T1420*14mm*1020*10mm specification as an example, three-view lofting is performed, as shown in Figure 3. Figure 6

[0089] The inner wall of the branch pipe should intersect with the outer wall of the main pipe by using the placing type welding joint.

[0090] The tee branch pipe is equally divided by 16, and the curve formed by the intersection of the branch pipe and the main pipe is the intersection line, and L1-L5 are the five main sizes after the branch pipe is equally divided by 16, as shown in Figure 4. Figure 7

[0091] It is found in the research that if the formula is used to calculate L1-L5, from the right view, the calculation can be performed by using the Pythagorean theorem:

[0092]

[0093]

[0094]

[0095]

[0096] L1=1000-L me

[0097] L mj =L mh =L mg =L mf =L​​me = main pipe radius, L dj = branch pipe inner diameter

[0098] In the calculation process, it is found that the size in the top view is consistent with the size in the right view, that is:

[0099] L ch = L DD′ = L OB = (branch pipe inner diameter / 2)*sin67.5° = (branch pipe inner diameter / 2)*cos22.5°

[0100] L bg = L CC′ = L OC = (branch pipe inner diameter / 2)*sin45° = (branch pipe inner diameter / 2)*cos45°

[0101] L af = L BB′ = L OD = (branch pipe inner diameter / 2)*sin22.5° = (branch pipe inner diameter / 2)*cos67.5°

[0102] In summary, the L1~L5 sizes are only related to the outer diameter of the main pipe, the outer diameter of the branch pipe, the wall thickness, and the distance from the branch pipe end face to the center of the main pipe. As long as the four key data are determined, the Excel table can be used to express according to this rule.

[0103] After the calculation and confirmation of the branch pipe blanking size, if the branch pipe is made of steel plate, CAD can be used to draw Figure 8 the schematic diagram, and then use a plasma or flame cutting machine to automatically blank, or directly mark the line on the steel plate and blank. After blanking, the branch pipe is processed by rolling.

[0104] If the branch pipe is made of steel pipe, a hardboard or other material can be used to draw and cut the blanking size according to the requirements, and then cut it after marking on the outer wall of the steel pipe.

[0105] As Figure 8 shown, after the size of each branch pipe is determined, the line connecting each point using a smooth curve is the intersection line. For the calculation of the intersection line, the Pythagorean theorem can be used again. For details, please refer to Figure 8 , and the length of the intersection line is calculated as follows:

[0106] The branch pipe expansion length is calculated based on the branch pipe diameter, and the branch pipe circumference is π*(2R2-μ). After N equal division of the tee branch pipe, the width of each equal part is π*(2R2-μ) / N. Then the length of the intersection line is:

[0107]

[0108] The table design type is various, and practicality and beauty can be met, as shown in the formula (1), only the key data is input, and the branch pipe blanking size and the welding length can be obtained. The user can increase other requirements on the basis of the calculation according to the own use requirement, such as calculating the actual weight of the tee, the waste produced in the processing of the main pipe and the branch pipe, and the consumption of welding material. Figure 9

[0109] Embodiment two

[0110] The embodiment provides a tee branch pipe blanking method based on the tee intersecting line welding length calculation method in embodiment one.

[0111] A tee branch pipe blanking method based on the tee intersecting line welding length calculation method in embodiment one, based on the obtained tee intersecting line welding length, an EXCEL form is designed, the EXCEL form is opened by using a mobile phone version office or wps in use, or the EXCEL form is made into an app and installed on a mobile phone, so that the branch pipe blanking under the conditions of no signal and no computer is met.

[0112] Further, if the branch pipe is a steel plate blanking processing, the plate after blanking is directly rolled and processed into a tee branch pipe; if the branch pipe is a steel pipe blanking, a suitable material is selected to cut out a blanking size and is coated on the outer wall of the steel pipe to draw a line and cut.

[0113] The above embodiment shows the blanking of a branch pipe (an installed type) in a reducing tee and the calculation of the intersecting line, in other embodiments, according to different welding modes, the key data required is inconsistent. For example, the calculation data required by the inserted type is as follows: the key size main pipe outer diameter, main pipe wall thickness, branch pipe outer diameter, branch pipe end face to main pipe center distance. The research process of other types of tees is carried out on the basis, and the embodiment will not repeat the detailed calculation process.

[0114] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0115] ​The preferred embodiments of the application disclosed above are only to facilitate the elucidation of the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made in light of the teachings above. The description is chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application and get the best results from the application. The application is only limited by the claims and their full scope and equivalents.

Claims

1. A method of calculating the length of a tee intersection weld, characterized by, The method comprises the following steps: Determine the size of the tee main pipe and the tee branch pipe, including the main pipe outer diameter 2R1, the branch pipe outer diameter 2R2, the wall thickness µ, and the distance H from the branch pipe end face to the center of the main pipe, and perform three-view lofting on the tee main pipe and the tee branch pipe to obtain the left view, the front view and the top view of the tee; N-fold lofting and refinement are performed on the tee branch pipe to obtain the left view, the front view and the top view of the tee after lofting and refinement, wherein N is a multiple of 4; 1+N / 4 reference refinement points capable of determining the shape of the intersecting line are determined in the front view; Based on the Pythagorean theorem and the trigonometric function, the vertical height expression of each reference refinement point to the branch pipe end face is obtained by using the corresponding relationship between the front view and the left view and the front view and the top view; Based on the vertical height expression of each reference refinement point to the branch pipe end face, the length of the tee intersecting line weld is calculated, specifically as follows: Based on the Pythagorean theorem, the vertical height expression of each reference refinement point to the branch pipe end face and the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe is obtained by using the corresponding relationship between the front view and the left view; Based on the trigonometric function, the vertical projection distance expression of the left view projection point of each reference refinement point to the center of the tee main pipe and the inner diameter of the branch pipe is obtained by using the corresponding relationship between the front view and the top view; In the left view, the vertical height expression of each reference refinement point to the branch pipe end face and the vertical projection distance of the left view projection point of each reference refinement point to the center of the tee main pipe is as follows: L n =H-D 1n D 1n = wherein, Ln is the vertical height from the nth reference refinement point to the branch end face; H is the distance from the branch end face to the main pipe center; D 1n is the vertical distance from the left view projection point of the nth reference refinement point to the three-way main pipe center, D 2n is the horizontal projection distance from the left view projection point of the nth reference refinement point to the three-way main pipe center, R1 is the main pipe radius; In the top view, the vertical projection distance expression of the left view projection point of each reference refinement point to the center of the tee main pipe and the inner diameter of the branch pipe is as follows: D 2n = wherein, denotes the angle between the line connecting the nth reference refinement point and the center of the tee branch and the center line of the main pipe in a top view.

2. The tee intersection weld length calculation method of claim 1, wherein, N-fold lofting and refinement are performed on the tee branch pipe to obtain the left view, the front view and the top view of the tee after lofting and refinement, specifically as follows: In the top view, the tee branch pipe is evenly divided into N equal parts along the circumferential direction to obtain N equal points; The N equal points obtained in the top view are projected into the front view to obtain 1+N / 2 front view projection points; The 1+N / 2 front view projection points in the front view are projected into the left view to obtain 1+N / 2 left view projection points, thereby obtaining the left view, the front view and the top view of the tee after lofting and refinement.

3. The method of calculating the length of a tee run weld according to claim 2, wherein, 1+N / 4 reference refinement points capable of determining the shape of the intersecting line are determined in the front view, specifically as follows: 1+N / 4 equal points on the path from the single lowest point to the highest point of the intersecting line of the tee branch pipe in the front view are taken as the reference refinement points.

4. The method of calculating the length of tee run welds according to claim 1, wherein, The branch pipe development length is calculated based on the branch pipe mean diameter, the branch pipe circumference is π*(2R2-µ), and the width of each equal part of the tee branch pipe after N-fold division is π*(2R2-µ) / N; therefore, the expression of the length L of the tee intersecting line weld is as follows: L=4*（ + +…+ ）。 5. A tee branch cutting method based on the tee branch intersecting line weld length calculation method according to any one of claims 1-4, characterized in that, Based on the obtained length of the tee intersecting line weld, an EXCEL form is designed, which can be opened by using a mobile phone version of office or wps or installed as an app on a mobile phone, thereby satisfying the branch pipe cutting under the condition of no signal and no computer.

6. The tee branch tube blanking method of claim 5, wherein, If the branch pipe is made of steel plate, the plate is directly rolled into the tee branch pipe after cutting; if the branch pipe is made of steel pipe, the pipe is cut after the appropriate material is selected and wrapped on the outer wall of the pipe.

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