Electron beam welding method for circular tube structure
By adjusting the placement angle and welding parameters of the circular tube structure in electron beam welding, high-quality welding of the circular tube structure is achieved, solving the problem that the prior art cannot effectively weld the circular tube structure with edge strips.
Patent Information
- Application Number
- CN202510026099.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-04-22
AI Technical Summary
The existing electron beam welding process cannot effectively weld the circular tube structure with edge strips, especially when the internal process of the circular tube cannot be processed, resulting in welding discontinuity and low material utilization.
By placing the circular tube structure in a direction parallel to the edge strip and rotating the first set angle, the beam is aligned with the junction position between the edge strip and the web on one side of the circular tube, uniform translation and rotation welding are performed, and the focus current, beam flow, and welding speed of the electron beam are adjusted, so that the beam flow penetrates the inner and outer surfaces of the circular tube at the same time.
High-quality and efficient welding of round tube structure welds is achieved, and defects such as unfusion, unwelded penetration and pores at overlaps are avoided, and the bonding strength of welding and the workpiece dimensional accuracy are improved.
Smart Images
Figure CN119857918A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electron beam welding, and in particular to an electron beam welding method for a circular tube structure. Background Art
[0002] In recent years, more and more aerospace vehicles have put forward the demand for manufacturing components with integrated structure and function, such as the typical load-bearing frame beam being designed as a new load-bearing structure with pipeline characteristics. However, such structures face difficulties in manufacturing technology, especially the manufacturing of large-sized components. Conventional pipeline structures can be manufactured only by turning, while pipeline-bearing integrated structures with flanges often require a combination of multi-axis milling and deep hole processing, and the processing technology is extremely complex. In addition, when the pipeline structure is non-linear, on the one hand, large-sized raw materials need to be used for processing, and the material utilization rate is low; on the other hand, the bent inner hole cannot be processed by mechanical processing.
[0003] For such structures, welding is undoubtedly the most economical and feasible manufacturing process, which can realize the manufacture of complex structures by welding simple structures. Among the many welding process methods, vacuum electron beam welding is widely used in the aerospace field due to its high energy density, small deformation and low pollution.
[0004] The weld joint surface structure of the above structure is complex, not only the welding thickness changes nonlinearly, but also there are discontinuous welding sections. The existing electron beam welding process needs to realize the welding of this type of structure by adding process pads, that is, by adding process pads of corresponding shapes, the variable thickness and discontinuous welding section is supplemented to a welding section of equal thickness, and then welding is performed. However, for the ribbed circular tube structure, its interior is not easy to process. If welding is carried out by adding process pads, the process pads inside the circular tube cannot be removed after welding. Therefore, the existing electron beam welding process cannot realize the welding of this type of structure. Summary of the invention
[0005] (1) Technical issues to be solved
[0006] The present application provides an electron beam welding method for a circular tube structure, which solves the problem that the existing electron beam welding process cannot realize the welding of the circular tube structure.
[0007] (2) Technical solution
[0008] The present application provides an electron beam welding method for a circular tube structure, which is applied to the circular tube structure. The circular tube structure comprises an edge strip, a web and a circular tube. Both sides of the outer surface of the circular tube are connected to the edge strip through the web respectively, and the web is perpendicular to the edge strip.
[0009] The electron beam welding method of the circular tube structure comprises:
[0010] The circular tube structure is placed in a position where the beam is parallel to the edge strip, and then the circular tube structure is rotated by a first set angle so that the beam is aligned with the junction of the edge strip and the web on one side of the circular tube as the beam starting point;
[0011] The circular tube structure is uniformly translated and uniformly rotated until the beam is parallel to the edge strip, and the web on one side of the circular tube is welded, so that the welding of the web and the rotation of the circular tube structure start and end at the same time.
[0012] Furthermore, the first setting angle is 5-45 degrees.
[0013] Furthermore, before placing the circular tube structure in a position where the beam is parallel to the edge strip, the method further includes:
[0014] A margin step of preset width and preset thickness is reserved on the surface adjacent to the weld joint surface of the circular tube structure.
[0015] Furthermore, the preset width is 2-5 mm, and the preset thickness is 0.5-1 mm.
[0016] Furthermore, the method comprises: uniformly translating the circular tube structure and rotating the circular tube structure at a uniform speed until the beam is parallel to the edge strip, welding the web on one side of the circular tube, and making the welding of the web and the rotation of the circular tube structure start and end at the same time, further comprising:
[0017] When welding the round tube, adjust the electron beam focusing current, beam size and welding speed so that the beam penetrates the inner and outer surfaces of the round tube at the same time.
[0018] Furthermore, after welding the round tube and adjusting the focusing current, beam size and welding speed of the electron beam so that the beam penetrates the inner and outer surfaces of the round tube at the same time, the method further includes:
[0019] The circular tube structure is uniformly translated to weld the web on the other side of the circular tube, and the circular tube structure is uniformly rotated by a first set angle so that welding the web and rotating the circular tube structure start and end simultaneously.
[0020] Furthermore, the method further comprises: uniformly translating the circular tube structure, welding the web on the other side of the circular tube, and uniformly rotating the circular tube structure by a first set angle so that the welding of the web and the rotation of the circular tube structure start and end at the same time.
[0021] The circular tube structure is rotated so that the edge strip is placed at a position perpendicular to the beam, and the edge strip on one side of the circular tube is welded. When the beam passes through the intersection of the edge strip and the web, the beam size is increased by a set ratio;
[0022] The circular tube structure is turned over 180 degrees, and the flange on the other side of the circular tube is welded. When the beam passes through the intersection of the flange and the web, the beam size is increased by a set ratio.
[0023] Furthermore, the electron beam welding method of the circular tube structure further comprises:
[0024] The circular tube structure is placed in a position where the beam is parallel to the edge strip, and then the circular tube structure is rotated by a second set angle so that the beam is aligned with the edge of the edge strip on one side of the circular tube as the starting point of the beam;
[0025] The circular tube structure is moved at a uniform speed so that the beam passes through the flange and web on one side of the circular tube, the circular tube, the web and flange on the other side of the circular tube in sequence. When passing through the junction between the flange and the web, and the junction between the web and the circular tube, the process parameters are adjusted to achieve penetration welding of the multilayer plate.
[0026] Furthermore, the second setting angle is 20-70 degrees.
[0027] Furthermore, the electron beam welding method of the circular tube structure further comprises:
[0028] After welding is completed, the excess step is removed so that the weld of the circular tube structure is connected to the surrounding matrix.
[0029] (3) Beneficial effects
[0030] The above technical solution of the present application has the following advantages:
[0031] The electron beam welding method for a circular tube structure provided in the present application is performed by placing the circular tube structure in a position where the beam is parallel to the edge strip, and then rotating the circular tube structure by a first set angle so that the beam is aligned with the junction of the edge strip and the web on one side of the circular tube as the beam starting point; the circular tube structure is uniformly translated and rotated at the same time until the beam is parallel to the edge strip, and the web on one side of the circular tube is welded, so that the welding of the web and the rotation of the circular tube structure are started and ended at the same time. When welding the web, the effective overlap of the edge strip weld and the web weld is achieved by the tilt angle, so as to avoid defects such as lack of fusion, lack of penetration, and pores at the overlap, thereby achieving high-quality and high-efficiency welding of the circular tube structure weld. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0033] Figure 1A schematic diagram of a circular tube structure provided for this application;
[0034] Figure 2 Schematic diagram of welding allowance provided for this application;
[0035] Figure 3 A schematic diagram of the initial welding position of the welded web provided for this application;
[0036] Figure 4 A schematic diagram of a web plate on one side of a welded circular tube provided for this application;
[0037] Figure 5 Schematic diagram of welded round pipe provided for this application;
[0038] Figure 6 A schematic diagram of the web on the other side of the welded circular tube provided for this application;
[0039] Figure 7 A schematic diagram of the initial welding position of the welding edge strip provided in this application;
[0040] Figure 8 A schematic diagram of a flange strip on one side of a welded circular tube provided in this application;
[0041] Fig. 9 A schematic diagram of the flange strip on the other side of the welded circular tube provided in this application;
[0042] Fig.10 A schematic diagram of the initial welding position of another welding method provided in this application;
[0043] Fig.11 A welding schematic diagram of another welding method provided for this application. DETAILED DESCRIPTION
[0044] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.
[0045] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.
[0046] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.
[0047] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. "Multiple" means "two or more".
[0048] The present application proposes an electron beam welding method for a circular tube structure, which achieves high-quality and high-efficiency welding of the circular tube structure weld by adjusting the workpiece angle and cooperating with a multi-layer penetration electron beam welding process.
[0049] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.
[0050] The electron beam welding method for a circular tube structure provided in the embodiment of the present application is applied to a circular tube structure, such as Figure 1 As shown, the circular tube structure includes an edge strip, a web and a circular tube, and the two sides of the outer surface of the circular tube are respectively connected to the edge strip through the web, and the web is perpendicular to the edge strip. The electron beam welding method of the circular tube structure includes: placing the circular tube structure in an orientation where the beam is parallel to the edge strip, and then rotating the circular tube structure by a first set angle so that the beam is aligned with the junction of the edge strip and the web on one side of the circular tube as the starting position of the beam; uniformly translating the circular tube structure and uniformly rotating the circular tube structure until the beam is parallel to the edge strip, welding the web on one side of the circular tube, so that welding the web and rotating the circular tube structure start and end at the same time.
[0051] The circular tube structure is placed in a position where the beam is parallel to the edge strip, and then the circular tube structure is rotated by a first set angle so that the beam is aligned with the junction of the edge strip and the web on one side of the circular tube as the beam starting point; the circular tube structure is uniformly translated and rotated at the same speed until the beam is parallel to the edge strip, and the web on one side of the circular tube is welded, so that the welding of the web and the rotation of the circular tube structure are started and ended at the same time. When welding the web, the effective overlap of the edge strip weld and the web weld is achieved through the tilt angle, and defects such as lack of fusion, lack of penetration, and pores are avoided at the overlap, so as to achieve high-quality and high-efficiency welding of the circular tube structure weld.
[0052] In some embodiments, the first setting angle is 5-45 degrees.
[0053] In some embodiments, before placing the circular tube structure in a position where the beam is parallel to the edge strip, the method further includes: reserving a margin step of a preset width and a preset thickness on a surface adjacent to the weld joint surface of the circular tube structure.
[0054] In some embodiments, the preset width is 2-5 mm, and the preset thickness is 0.5-1 mm.
[0055] In some embodiments, the circular tube structure is uniformly translated and simultaneously rotated until the beam is parallel to the edge strip, and the web on one side of the circular tube is welded, so that the welding of the web and the rotation of the circular tube structure start and end at the same time. It also includes: welding the circular tube, adjusting the focusing current, beam size and welding speed of the electron beam, so that the beam penetrates the inner and outer surfaces of the circular tube at the same time.
[0056] In some embodiments, the welding of the circular tube, adjusting the focusing current, beam size and welding speed of the electron beam so that the beam penetrates the inner and outer surfaces of the circular tube at the same time, further includes: uniformly translating the circular tube structure to weld the web on the other side of the circular tube, and uniformly rotating the circular tube structure by a first set angle so that the welding of the web and the rotation of the circular tube structure start and end at the same time.
[0057] In some embodiments, the circular tube structure is uniformly translated to weld the web on the other side of the circular tube, and the circular tube structure is uniformly rotated by a first set angle so that the welding of the web and the rotation of the circular tube structure start and end simultaneously. The method further includes: rotating the circular tube structure to place the edge strip at a position perpendicular to the beam, welding the edge strip on one side of the circular tube, and increasing the beam size by a set proportion when the beam passes through the intersection of the edge strip and the web; flipping the circular tube structure 180 degrees, welding the edge strip on the other side of the circular tube, and increasing the beam size by a set proportion when the beam passes through the intersection of the edge strip and the web.
[0058] In some embodiments, the electron beam welding method of the circular tube structure also includes: placing the circular tube structure in a position where the beam is parallel to the edge strip, and then rotating the circular tube structure by a second set angle so that the beam is aligned with the edge position of the edge strip on one side of the circular tube as the starting position of the beam; moving the circular tube structure at a uniform speed so that the beam passes through the edge strip and web on one side of the circular tube, the circular tube, and the web and edge strip on the other side of the circular tube in turn, and when passing through the junction of the edge strip and the web, and the junction of the web and the circular tube, adjusting the process parameters to achieve penetration welding of the multilayer board.
[0059] In some embodiments, the second set angle is 20-70 degrees.
[0060] In some embodiments, the electron beam welding method for the circular tube structure further includes: after welding is completed, removing the excess step so that the weld of the circular tube structure is connected to the surrounding substrate.
[0061] Since electron beam welding will produce a certain degree of undercut on the weld surface, it is necessary to reserve a 2-5mm wide and 0.5-1mm thick margin step on the surface adjacent to the weld butt surface, such as Figure 2 The initial welding position is as shown. Figure 3 As shown, the workpiece of the circular tube structure is placed in a position where the beam is parallel to the edge strip, that is, the edge strip is vertical, and then the workpiece is rotated to a first set angle, which is the angle between the edge strip and the vertical line, ranging from 5 to 45 degrees, which is equivalent to Figure 3 In the middle, 45 degrees ≤ a ≤ 85 degrees, align the beam with the junction of the edge strip and the web, which is the starting point of the beam.
[0062] like Figure 4 As shown, the workpiece is uniformly translated and rotated to a = 90 degrees at a uniform speed, and the web at the front end of the round tube is welded, so that the web welding and the rotating workpiece start and end at the same time. Figure 5 As shown, when welding a round tube, adjust the electron beam focusing current, welding beam current and welding speed so that the electron beam penetrates the upper and lower surfaces of the round tube at the same time and forms a well-formed weld. Figure 6 As shown, the web at the rear end of the round tube is welded, and the workpiece is rotated at a constant speed to a first set angle, so that the web welding and the rotating workpiece start and end at the same time; the welding ends at the junction of the flange and the web.
[0063] like Figure 7 As shown, rotate the workpiece to position the edge strip perpendicular to the beam. Figure 8 As shown, when welding the edge strip on the A side, during the welding process, when the electron beam passes through the intersection of the edge strip and the web, the beam current is increased by 20-40% to ensure that the intersection can be fully melted. Fig. 9 As shown, rotate the workpiece 180 degrees and weld the edge strip on the B side in the same way.
[0064] Another welding method: The initial welding position is as follows: Fig.10 As shown, the workpiece is placed in a position where the beam is parallel to the edge strip, that is, the edge strip is vertical, and then the workpiece is rotated to a second set angle, which is the angle between the edge strip and the vertical line, ranging from 20 to 70 degrees, which is equivalent to Fig.10 20 degrees ≤ a ≤ 70 degrees, align the beam to the edge of the edge strip, which is the starting point of the beam. Fig.11 As shown, the workpiece is moved at a constant speed so that the beam passes through the leading edge strip, the leading web, the circular tube, the rear web, and the trailing edge strip in sequence. When passing through the junction between the edge strip and the web, and the junction between the web and the circular tube, the high energy density of the electron beam is utilized and the process parameters are adjusted to achieve penetration welding of the multilayer plate.
[0065] After welding is completed, a small amount of excess steps near the weld are removed by CNC machining or manual grinding, and connected to the surrounding matrix to complete the electron beam welding of the ribbed circular tube structure.
[0066] The following is described by means of specific examples.
[0067] Example 1
[0068] The weld of the ribbed circular tube structure is reserved with a 3mm wide and 1mm thick margin step on the surface adjacent to the weld joint. The workpiece is placed in a position where the beam is parallel to the edge bar, and then the workpiece is rotated so that the angle a between the edge bar and the horizontal plane is 80 degrees; the beam is aligned with the junction of the edge bar and the web, which is the starting point of the beam.
[0069] The workpiece is translated at a constant speed of 15 mm / s and rotated at a constant speed to a = 90 degrees, and the web at the front end of the round tube is welded, so that the web welding and the rotating workpiece start and end at the same time; then the workpiece angle is kept unchanged and the round tube section is welded at a speed of 15 mm / s. The process parameters for welding the web and round tube section need to be optimized in advance on the process test plate of the same thickness to obtain good front and back weld formation. The workpiece is translated at a constant speed of 15 mm / s, and the web at the rear end of the round tube is welded, and the workpiece is rotated to a = 80 degrees, so that the web welding and the rotating workpiece start and end at the same time; the welding ends at the junction of the flange and the web.
[0070] Rotate the workpiece and place the edge strip at a position perpendicular to the beam. Weld the edge strip on the A side. During the welding process, when the electron beam passes through the intersection of the edge strip and the web, increase the beam current by 20% to ensure that the intersection can be fully melted. Rotate the workpiece 180 degrees and weld the edge strip on the B side in the same way.
[0071] The process parameters used in this embodiment are: acceleration voltage 150kV, focusing current 2030mA and beam current 35mA for the web section; focusing current 2025mA and beam current 80mA for the round tube section; focusing current 2040mA and beam current 35mA for the edge section. After welding, a small amount of excess steps near the weld are removed by CNC machining or manual grinding, and connected to the surrounding substrate, thus completing the electron beam welding of the ribbed round tube structure.
[0072] Example 2
[0073] The weld of the ribbed round tube structure is reserved with a 3mm wide and 1mm thick margin step on the surface adjacent to the weld joint. Then the workpiece is rotated so that the angle a between the edge strip and the horizontal plane is 50 degrees, and the beam is aligned with the edge of the edge strip, which is the starting point of the beam.
[0074] The workpiece angle is fixed and moved at a constant speed of 15 mm / s, so that the beam passes through the leading edge strip, the leading web, the circular tube, the rear web, and the trailing edge strip in sequence. When passing through the junction between the edge strip and the web, and the junction between the web and the circular tube, the high energy density of the electron beam is utilized to adjust the process parameters to achieve penetration welding of the multilayer plate.
[0075] The process parameters adopted in this embodiment are: acceleration voltage 150kV, leading edge strip segment focusing current 2035mA, beam current 35mA; front web segment focusing current 2030mA, beam current 35mA; circular tube segment focusing current 2025mA, beam current 80mA; rear web segment focusing current 2035mA, beam current 35mA; rear edge strip segment focusing current 2040mA, beam current 35mA; after welding is completed, a small amount of excess steps near the weld are removed by CNC machining or manual grinding, and connected to the surrounding substrate, thus completing the electron beam welding of the ribbed circular tube structure.
[0076] The electron beam welding method for a circular tube structure provided in the embodiment of the present application can realize efficient, high-quality, and low-cost welding and manufacturing of a ribbed circular tube structure, thereby solving the problem that such a structure cannot be processed. The specific beneficial effects are as follows: by designing the allowance in the thickness and width directions at the position to be welded, defects such as weld undercut and collapse can be avoided from affecting the final workpiece dimensions, thereby effectively ensuring the weld bonding strength while avoiding stress concentration; when welding the web, the angle of inclination can be used to achieve effective overlap between the flange weld and the web weld, thereby avoiding defects such as lack of fusion, lack of penetration, and pores at the overlap; by adjusting the process parameters, both sides of the circular tube are welded and formed at one time, thereby effectively avoiding problems such as large deformation and multiple overlaps that are prone to occur during multiple welding, thereby significantly improving the weld performance and workpiece dimensional accuracy, while also greatly reducing the difficulty of subsequent processing, thereby achieving improved production efficiency and reduced production costs.
[0077] It should be clear that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The present application is not limited to the specific structures described above and shown in the figures. In addition, for the sake of simplicity, detailed descriptions of known methods and technologies are omitted here.
[0078] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.
Claims
1. An electron beam welding method for a circular tube structure, characterized in that: Applied to a circular tube structure, the circular tube structure comprises a flange, a web and a circular tube, the outer surface of the circular tube is connected to the flange at both sides through the web respectively, and the web is perpendicular to the flange; The electron beam welding method of the circular tube structure comprises: The circular tube structure is placed in a position where the beam is parallel to the edge strip, and then the circular tube structure is rotated by a first set angle so that the beam is aligned with the junction of the edge strip and the web on one side of the circular tube as the beam starting point; The circular tube structure is uniformly translated and uniformly rotated until the beam is parallel to the edge strip, and the web on one side of the circular tube is welded, so that the welding of the web and the rotation of the circular tube structure start and end at the same time.
2. The electron beam welding method of a circular tube structure according to claim 1, characterized in that: The first setting angle is 5-45 degrees.
3. The electron beam welding method of a circular tube structure according to claim 1, characterized in that: Before placing the circular tube structure in a position where the beam is parallel to the edge strip, the method further includes: A margin step of preset width and preset thickness is reserved on the surface adjacent to the weld joint surface of the circular tube structure.
4. The electron beam welding method of a circular tube structure according to claim 3, characterized in that: The preset width is 2-5 mm, and the preset thickness is 0.5-1 mm.
5. The electron beam welding method of a circular tube structure according to claim 1, characterized in that: The method comprises the following steps: uniformly translating the circular tube structure and uniformly rotating the circular tube structure until the beam is parallel to the edge strip, welding the web on one side of the circular tube, and making the welding of the web and the rotation of the circular tube structure start and end at the same time; and When welding the round tube, adjust the electron beam focusing current, beam size and welding speed so that the beam penetrates the inner and outer surfaces of the round tube at the same time.
6. The electron beam welding method of a circular tube structure according to claim 5, characterized in that: After welding the round tube and adjusting the focusing current, beam size and welding speed of the electron beam so that the beam penetrates the inner and outer surfaces of the round tube at the same time, the method further includes: The circular tube structure is uniformly translated to weld the web on the other side of the circular tube, and the circular tube structure is uniformly rotated by a first set angle so that welding the web and rotating the circular tube structure start and end simultaneously.
7. The electron beam welding method of a circular tube structure according to claim 6, characterized in that: After uniformly translating the circular tube structure to weld the web on the other side of the circular tube, and uniformly rotating the circular tube structure by a first set angle so that the welding of the web and the rotation of the circular tube structure start and end at the same time, the method further includes: The circular tube structure is rotated so that the edge strip is placed at a position perpendicular to the beam, and the edge strip on one side of the circular tube is welded. When the beam passes through the intersection of the edge strip and the web, the beam size is increased by a set ratio; The circular tube structure is turned over 180 degrees, and the flange on the other side of the circular tube is welded. When the beam passes through the intersection of the flange and the web, the beam size is increased by a set ratio.
8. The electron beam welding method of a circular tube structure according to claim 1, characterized in that: The electron beam welding method for the circular tube structure further comprises: The circular tube structure is placed in a position where the beam is parallel to the edge strip, and then the circular tube structure is rotated by a second set angle so that the beam is aligned with the edge of the edge strip on one side of the circular tube as the starting point of the beam; The circular tube structure is moved at a uniform speed so that the beam passes through the flange and web on one side of the circular tube, the circular tube, the web and flange on the other side of the circular tube in sequence. When passing through the junction between the flange and the web, and the junction between the web and the circular tube, the process parameters are adjusted to achieve penetration welding of the multilayer plate.
9. The electron beam welding method of a circular tube structure according to claim 8, characterized in that: The second setting angle is 20-70 degrees.
10. The electron beam welding method of a circular tube structure according to claim 3, characterized in that: The electron beam welding method for the circular tube structure further comprises: After welding is completed, the excess step is removed so that the weld of the circular tube structure is connected to the surrounding matrix.