Welding structure and welding method for vacuum electron beams of aluminum parts
By designing the vacuum electron beam welding structure of multi-leaf weld beads and long arc weld beads, combined with specific welding sequences and processes, the welding defects of pure aluminum parts are solved, and efficient welding effect and low helium leakage detection are achieved. meets the requirements of the high-end electronics industry.
Patent Information
- Application Number
- CN202411470608.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-01-10
AI Technical Summary
The existing vacuum electron beam welding technology is prone to cracking, pores, and bead collapse of pure aluminum parts, and cannot meet the high-end electronics industry's high-efficiency production and low-cost requirements for aluminum heating disks.
Design a welding structure for vacuum electron beams of aluminum parts, adopting multi-leaf first weld beads, long arc second and third weld beads, and through specific welding sequences and processes, a closed area is formed to improve welding tightness. and mechanical strength, combined with semicircular bevels and fixed rivets to prevent defects.
The welding strength and density of aluminum parts have been significantly improved, and the helium leakage detection leakage rate is less than 1×10-12Pa·m3/s, meeting the requirements of the high-end electronics industry.
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Figure CN119282341A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of welding, and in particular to a vacuum electron beam welding structure and a welding method for aluminum parts. Background Art
[0002] At present, the demand for aluminum parts has increased significantly, and vacuum electron beam welding is an important processing procedure for aluminum parts. Vacuum electron beam welding has high production efficiency and little impact on the grain of aluminum parts, meeting customers' requirements for special product performance, and can achieve the purpose of efficient production and reduced manufacturing costs.
[0003] However, for the welding of pure aluminum parts, the current vacuum electron beam welding of such products is prone to defects such as cracking, porosity, and weld collapse. The appearance is poor and the effective penetration depth is insufficient, which cannot meet the requirements of the high-end electronics industry for aluminum heating plates.
[0004] Therefore, developing a vacuum electron beam welding method for pure aluminum parts with better welding effect is very important for improving the welding strength and density of pure aluminum parts. Summary of the invention
[0005] In order to solve the above technical problems, the present invention provides a vacuum electron beam welding structure and welding method for aluminum parts. By designing a specific weld bead and combining welding processes, the vacuum electron beam welding tightness of aluminum parts can be significantly improved, the weld appearance is beautiful, the weld is tightly combined, and the helium leakage detection leakage rate is less than 1×10 -12 Pa·m 3 / s, and has broad application prospects.
[0006] To achieve this object, the present invention adopts the following technical solutions:
[0007] In a first aspect, the present invention provides a vacuum electron beam welding structure for an aluminum component, wherein the cross section of the aluminum component is circular;
[0008] The welding structure includes a first weld bead, a second weld bead and a third weld bead which are sequentially arranged on the surface to be welded of the aluminum component from the center of the circle from the inside to the outside in the radial direction;
[0009] The first weld bead is multi-lobed;
[0010] The second weld bead includes a first arc portion and a first connecting portion, the center of the first arc portion being the same as the center of the cross section of the aluminum component;
[0011] The third weld bead includes a second arc portion and a second connecting portion, the center of the second arc portion is the same as the center of the cross section of the aluminum component;
[0012] The first connection portion is connected to the second connection portion so that the first weld bead and the second weld bead form a closed area.
[0013] The vacuum electron beam welding structure of the aluminum component provided by the present invention strictly adopts three welds, namely, the first weld, the second weld and the third weld, wherein the first weld is closer to the center of the circle and presents a multi-lobed shape, which can not only better disperse heat during welding, but also achieve uniform distribution of the weld and improve the mechanical strength of the welding. Compared with directly setting a circular or long arc weld on the innermost side, the multi-lobed weld can better establish a better welding strength in the inner part close to the center of the circle and in the central part of the circular aluminum component; the second weld and the third weld are set in a long arc shape, which can not only better perform welding in the large diameter area, but also have a stronger welding strength.
[0014] The present invention also requires connecting the first connection portion with the second connection portion so that the first weld bead and the second weld bead form a closed area, which enables the welds of the first weld bead and the second weld bead to interact with each other to relieve the welding force of the welds.
[0015] Preferably, the number of the multi-lobed blades is at least three, and the multi-lobed blades are distributed at equal angles about the center of the circle.
[0016] Preferably, the radius of the circle of the cross-section of the aluminum component is denoted as R, and half of the length of the longest radial direction of the multi-lobed shape is 0.4 to 0.5R, for example, it can be 0.4R, 0.42R, 0.43R, 0.44R, 0.45R, 0.46R, 0.47R, 0.48R, 0.49R or 0.5R, etc.
[0017] Preferably, the circular ring structure of the closed area formed by the second weld bead and the third weld bead has an opening.
[0018] The present invention preferably forms an opening in the closed area formed by the second weld bead and the third weld bead, which can provide a buffer space for the welding force of the arc ring formed by the second weld bead and the third weld bead, thereby avoiding the situation where the tension borne by the weld cannot be released during the cooling process after high-temperature welding, resulting in weld cracking or low welding density.
[0019] Preferably, the central angle corresponding to the arc of the opening is 5° to 20°, for example, it may be 5°, 7°, 9°, 10°, 12°, 14°, 15°, 17°, 19° or 20°.
[0020] The present invention further preferably sets the central angle within the above range, which can better improve the welding effect and reduce the helium leak detection leakage rate.
[0021] Preferably, the first connecting portion and the first arc-shaped portion transition through an arc angle, and the second connecting portion and the second arc-shaped portion transition through an arc angle. This arrangement has a better welding effect.
[0022] Preferably, the radius of the circle of the cross-section of the aluminum component is denoted as R, and the radial distance between the second weld bead and the third weld bead is 0.1~0.3R, for example, it can be 0.1R, 0.13R, 0.15R, 0.17R, 0.19R, 0.22R, 0.24R, 0.26R, 0.28R or 0.3R, etc.
[0023] Preferably, the radius of the second arc portion in the third weld bead is 0.8-0.95R, for example, it may be 0.8R, 0.82R, 0.84R, 0.85R, 0.87R, 0.89R, 0.9R, 0.92R, 0.94R or 0.95R.
[0024] Preferably, the groove of the welding structure is semicircular.
[0025] The present invention preferably adopts a semicircular groove, which can ensure the penetration depth after machining after welding (the effective penetration depth is not machined away) on the one hand, and on the other hand, the molten metal after welding of the groove can effectively fill the gap of the groove, and it is not easy to produce defects.
[0026] Preferably, the radius of the semicircle is 0.5-1 mm, for example, it can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm or 1 mm.
[0027] Preferably, the first weld bead, the second weld bead and the third weld bead are each independently provided with a fixed rivet point.
[0028] The present invention preferably adopts a fixed rivet point method, which can prevent the accessories from warping during the welding process and further improve the welding strength.
[0029] In a second aspect, the present invention provides a vacuum electron beam welding method for aluminum parts, wherein the welding method is performed using the vacuum electron beam welding structure for aluminum parts described in the first aspect; in the welding method, welding is performed in the order of a third weld bead, a second weld bead, and a first weld bead.
[0030] The welding method provided by the present invention adopts a welding sequence from outside to inside, the welding temperature is evenly distributed, and it is not easy to cause a large deformation, so the helium leakage detection rate after welding is low.
[0031] Preferably, the vacuum degree of the vacuum electron beam welding is less than 1×10 -2 Pa, for example, can be 0.98×10 -2Pa, 0.97×10 -2 Pa, 0.96×10 -2 Pa, 0.95×10 -2 Pa, 0.9×10 -2 Pa, 0.85×10 -2 Pa, 0.8×10 -2 Pa, 0.75×10 -2 Pa or 0.7×10 -2 Pa et al.
[0032] Preferably, the acceleration voltage of the vacuum electron beam welding is 100-150 kV, for example, it can be 100 kV, 106 kV, 112 kV, 117 kV, 123 kV, 128 kV, 134 kV, 139 kV, 145 kV or 150 kV.
[0033] Preferably, the vacuum electron beam welding includes first setting a fixed riveting point, and then sequentially performing a surface focus treatment and a sinking focus treatment.
[0034] Preferably, the welding beam current of the fixed riveting point is 10-30 mA, for example, it can be 10 mA, 13 mA, 15 mA, 17 mA, 19 mA, 22 mA, 24 mA, 26 mA, 28 mA or 30 mA.
[0035] Preferably, the welding speed of the surface focus treatment is 10 to 25 mm / s, for example, it can be 10 mm / s, 12 mm / s, 14 mm / s, 15 mm / s, 17 mm / s, 19 mm / s, 20 mm / s, 22 mm / s, 24 mm / s or 25 mm / s.
[0036] Preferably, the welding beam current of the surface focus treatment is 20-40 mA, for example, it can be 20 mA, 23 mA, 25 mA, 27 mA, 29 mA, 32 mA, 34 mA, 36 mA, 38 mA or 40 mA.
[0037] Preferably, the welding speed of the coking treatment is 10 to 25 mm / s, for example, it can be 10 mm / s, 12 mm / s, 14 mm / s, 15 mm / s, 17 mm / s, 19 mm / s, 20 mm / s, 22 mm / s, 24 mm / s or 25 mm / s.
[0038] Preferably, the welding beam current of the coking treatment is 30-60 mA, for example, it can be 30 mA, 34 mA, 37 mA, 40 mA, 44 mA, 47 mA, 50 mA, 54 mA, 57 mA or 60 mA.
[0039] The present invention further preferably uses the above-mentioned welding beam for welding, wherein the welding speed is too fast and the penetration depth is insufficient, and too slow and easy to cause large deformation; the welding beam is too large and the penetration depth is deep, but the deformation is large, and the welding beam is too small and the penetration depth is shallow, which is difficult to meet the requirements.
[0040] Compared with the prior art, the present invention has at least the following beneficial effects:
[0041] (1) The vacuum electron beam welding structure of aluminum parts provided by the present invention can improve the tightness of the weld through the design of a specific weld bead structure, and the helium leak detection rate is less than 1×10 -12 Pa·m 3 / s;
[0042] (2) The vacuum electron beam welding method for aluminum parts provided by the present invention combines a specific welding structure, welding sequence and welding process, which can significantly improve the welding effect and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] Figure 1 It is a schematic diagram of the weld bead of the vacuum electron beam welding structure of the aluminum component provided in Example 1 of the present invention.
[0044] Figure 2 It is a schematic diagram of the groove of the vacuum electron beam welding structure of the aluminum component provided in Example 1 of the present invention.
[0045] Figure 3 It is a schematic diagram of the groove of the vacuum electron beam welding structure of the aluminum component provided in Example 4 of the present invention.
[0046] Figure 4 It is a schematic diagram of the groove of the vacuum electron beam welding structure of the aluminum component provided in Example 5 of the present invention.
[0047] In the figure, 1-first weld bead; 2-second weld bead; 21-first arc portion; 22-first connecting portion; 3-second weld bead; 31-second arc portion; 32-second connecting portion. DETAILED DESCRIPTION
[0048] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.
[0049] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0050] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.
[0051] As a specific embodiment of the present invention, a vacuum electron beam welding method for aluminum parts is provided, and the welding method comprises the following steps:
[0052] The flatness and parallelism of the upper and lower surfaces of the pure aluminum circular bottom plate and cover plate are less than 5 wires to obtain the processed product;
[0053] The processed product is sequentially deburred and polished, and subsequently cleaned with acid and alkali, rinsed with pure water, dried with compressed air, and vacuum dried to obtain a dried product;
[0054] The base plate and cover plate are assembled in sequence, and the dried product is subjected to vacuum electron beam welding to obtain a welded product. The welded product is subjected to welding surface machining, and then a helium leak detection is performed.
[0055] Example 1
[0056] This embodiment provides a vacuum electron beam welding structure for an aluminum component, which includes a first weld bead, a second weld bead, and a third weld bead sequentially arranged on the surface to be welded of the aluminum component from the center of the circle to the outside in the radial direction;
[0057] Reference Figure 1, the first weld bead is four-leaf shaped; the leaves of the multi-leaf shaped are distributed at equal angles with the center of the circle. The second weld bead includes a first arcuate portion and a first connecting portion, the center of the first arcuate portion is the same as the center of the cross section of the aluminum component; the third weld bead includes a second arcuate portion and a second connecting portion, the center of the second arcuate portion is the same as the center of the cross section of the aluminum component.
[0058] The first connection portion is connected to the second connection portion so that the first weld bead and the second weld bead form a closed area. The circular ring structure formed by the second weld bead and the third weld bead has an opening; the arc of the opening corresponds to a central angle of 15°. The first connection portion and the first arc portion transition through an arc angle, and the second connection portion and the second arc portion transition through an arc angle.
[0059] The radius of the circle of the cross section of the aluminum component is denoted as R, and half of the longest radial length of the multi-lobed shape is 0.45R. The radius of the circle of the cross section of the aluminum component is denoted as R, and the radial distance between the second weld bead and the third weld bead is 0.2R; the radius of the second arc portion of the third weld bead is 0.8R.
[0060] Reference Figure 2 The groove of the welding structure is semicircular; the radius of the semicircle is 0.8 mm.
[0061] The first weld bead, the second weld bead and the third weld bead are each independently provided with a fixed rivet point.
[0062] This embodiment also provides a vacuum electron beam welding method for aluminum parts, the welding method comprising the following steps:
[0063] (1) Assemble the pure aluminum circular bottom plate (diameter 300 mm, thickness 30 mm) and cover plate (thickness 10 mm) in sequence. After assembly, the weld bead is as follows: Figure 1 As shown;
[0064] (2) After the assembly in step (1) is completed, rivets are used to fix the rivet points at the weld, and the welding beam current of the fixed rivet points is 10 mA to obtain a welded structure;
[0065] (3) The welding is performed in the order of the third weld, the second weld, and the first weld. The vacuum degree of vacuum electron beam welding is 0.95×10 -2 Pa, the acceleration voltage is 150kV, and surface focus treatment and sinking focus treatment are performed in sequence. The welding speed of the surface focus treatment is 15mm / s, and the welding beam current is 20mA; the welding speed of the sinking focus treatment is 20mm / s, and the welding beam current is 50mA.
[0066] Example 2
[0067] This embodiment provides a vacuum electron beam welding structure for an aluminum component, which includes a first weld bead, a second weld bead, and a third weld bead sequentially arranged on the surface to be welded of the aluminum component from the center of the circle to the outside in the radial direction;
[0068] The first weld bead is five-leaf shaped; the multi-leaf blades are distributed at equal angles with the center of the circle. The second weld bead includes a first arc portion and a first connecting portion, the center of the first arc portion is the same as the center of the cross section of the aluminum component; the third weld bead includes a second arc portion and a second connecting portion, the center of the second arc portion is the same as the center of the cross section of the aluminum component. The first connecting portion transitions with the first arc portion through an arc angle, and the second connecting portion transitions with the second arc portion through an arc angle.
[0069] The first connection part is connected to the second connection part so that the first weld bead and the second weld bead form a closed area. The circular ring structure of the closed area formed by the second weld bead and the third weld bead has an opening; the central angle corresponding to the arc of the opening is 5°.
[0070] The radius of the circle of the cross section of the aluminum component is denoted as R, and the half of the longest radial length of the multi-lobed shape is 0.5R. The radius of the circle of the cross section of the aluminum component is denoted as R, and the radial distance between the second weld bead and the third weld bead is 0.1R; the radius of the second arc portion of the third weld bead is 0.95R.
[0071] The groove of the welding structure is semicircular; the radius of the semicircle is 0.8 mm.
[0072] The first weld bead, the second weld bead and the third weld bead are each independently provided with a fixed rivet point.
[0073] This embodiment also provides a vacuum electron beam welding method for aluminum parts, the welding method comprising the following steps:
[0074] (1) Install the pure aluminum circular bottom plate (diameter 250 mm, thickness 35 mm) and cover plate (thickness 15 mm) in sequence;
[0075] (2) After the assembly in step (1) is completed, rivets are used to fix the rivet points at the weld, and the welding beam current of the fixed rivet points is 30 mA to obtain a welded structure;
[0076] (3) The welding is performed in the order of the third weld, the second weld, and the first weld. The vacuum degree of vacuum electron beam welding is 0.5×10 -2Pa, the acceleration voltage is 100kV, and surface focus treatment and sinking focus treatment are performed in sequence. The welding speed of the surface focus treatment is 25mm / s, and the welding beam current is 30mA; the welding speed of the sinking focus treatment is 15mm / s, and the welding beam current is 30mA.
[0077] Example 3
[0078] This embodiment provides a vacuum electron beam welding structure for an aluminum component, which includes a first weld bead, a second weld bead, and a third weld bead sequentially arranged on the surface to be welded of the aluminum component from the center of the circle to the outside in the radial direction;
[0079] The first weld bead is five-leaf shaped; the multi-leaf blades are distributed at equal angles with the center of the circle. The second weld bead includes a first arc portion and a first connecting portion, the center of the first arc portion is the same as the center of the cross section of the aluminum component; the third weld bead includes a second arc portion and a second connecting portion, the center of the second arc portion is the same as the center of the cross section of the aluminum component. The first connecting portion transitions with the first arc portion through an arc angle, and the second connecting portion transitions with the second arc portion through an arc angle.
[0080] The first connection part is connected to the second connection part so that the first weld bead and the second weld bead form a closed area. The circular ring structure of the closed area formed by the second weld bead and the third weld bead has an opening; the central angle corresponding to the arc of the opening is 20°.
[0081] The radius of the circle of the cross section of the aluminum component is denoted as R, and half of the longest radial length of the multi-lobed shape is 0.4R. The radius of the circle of the cross section of the aluminum component is denoted as R, and the radial distance between the second weld bead and the third weld bead is 0.3R; the radius of the second arc portion of the third weld bead is 0.8R.
[0082] The groove of the welding structure is semicircular; the radius of the semicircle is 0.8 mm.
[0083] The first weld bead, the second weld bead and the third weld bead are each independently provided with a fixed rivet point.
[0084] This embodiment also provides a vacuum electron beam welding method for aluminum parts, the welding method comprising the following steps:
[0085] (1) Assemble the pure aluminum circular bottom plate (diameter 350 mm, thickness 40 mm) and cover plate (thickness 25 mm) in sequence;
[0086] (2) After the assembly in step (1) is completed, rivets are used to fix the rivet points at the weld, and the welding beam current of the fixed rivet points is 10 mA to obtain a welded structure;
[0087] (3) The welding is performed in the order of the third weld, the second weld, and the first weld. The vacuum degree of vacuum electron beam welding is 0.8×10 -2 Pa, the acceleration voltage is 120kV, and surface focus treatment and sinking focus treatment are performed in sequence. The welding speed of the surface focus treatment is 10mm / s, and the welding beam current is 20mA; the welding speed of the sinking focus treatment is 10mm / s, and the welding beam current is 60mA.
[0088] Example 4
[0089] This embodiment provides a vacuum electron beam welding method for aluminum parts. In the welding method, the groove of the welding structure is square, and the depth of the square is the same as the radius of the circle. Figure 3 , the rest are the same as in Example 1 and will not be described again.
[0090] Example 5
[0091] This embodiment provides a vacuum electron beam welding method for aluminum parts. The welding method is the same as that of Embodiment 1 except that the central angle of the arc of the opening is 25°, and is not described again.
[0092] Example 6
[0093] This embodiment provides a vacuum electron beam welding method for aluminum parts. The welding method is the same as that of Embodiment 1 except that the welding beam current of the surface focus treatment is 50 mA, and the details will not be repeated here.
[0094] Example 7
[0095] The present embodiment provides a vacuum electron beam welding method for aluminum parts. The welding method is the same as that of the first embodiment except that the welding beam current of the surface focus treatment is 10 mA, and thus will not be described in detail.
[0096] Example 8
[0097] The present embodiment provides a vacuum electron beam welding method for aluminum parts. The welding method is the same as that of Embodiment 1 except that the welding beam current of the coking treatment is 70 mA, and the details will not be described again.
[0098] Comparative Example 1
[0099] This comparative example provides a vacuum electron beam welding method for aluminum parts. The welding method has the following features: Figure 4 , the rest are the same as in Example 1 and will not be described again.
[0100] Comparative Example 2 (changed to comparative example)
[0101] The present embodiment provides a vacuum electron beam welding method for aluminum parts. The welding method is the same as that of Embodiment 1 except that the first connecting portion is perpendicularly arranged to the first arc portion, and the second connecting portion is perpendicularly arranged to the second arc portion, and the rest is not described again.
[0102] Comparative Example 3
[0103] This comparative example provides a vacuum electron beam welding method for aluminum parts. The welding method is the same as Example 1 except that the welding beam current of the coking treatment is 20 mA, and the details are not repeated here.
[0104] The above embodiments and comparative examples all adopt helium leakage to detect the leakage rate. The test results of the above embodiments and comparative examples are shown in Table 1.
[0105] Table 1
[0106]
[0107]
[0108] From Table 1, we can see the following points:
[0109] (1) It can be seen from Examples 1 to 3 that the vacuum electron beam welding structure of aluminum parts provided by the present invention has excellent welding performance and a helium leak detection rate of 0.5×10 -12 Pa·m 3 / s or less;
[0110] (2) Based on Example 1, Example 4 and Comparative Example 1, it can be seen that the semicircular groove used in Example 1 is 0.48×10- -12 Pa·m 3 / s, while the helium leakage detection rates in Example 4 and Comparative Example 1 were only 0.52×10 -12 Pa·m 3 / s and 7.34×10 -10 Pa·m 3 / s, which is because after the straight groove welding weld surface is processed (the surface needs to be removed by 2 to 3 mm), the effective penetration depth is processed more, resulting in a higher helium leak detection rate. This shows that the present invention can ensure the effective penetration depth after machining and reduce the helium leak detection rate by preferably using a semicircular groove;
[0111] (3) Combining Example 1 and Example 5, it can be seen that the central angle of the arc of the opening in Example 1 is 15°, compared with 25° in Example 5, the helium leakage detection rate in Example 1 is 0.48×10 -12Pa·m 3 / s, while the helium leakage detection rate in Example 5 is only 0.63×10 -12 Pa·m 3 / s, which shows that the present invention can further improve the tightness of welding and reduce the leakage rate of helium leakage detection by preferably adopting an opening with a suitable angle;
[0112] (4) Combining Example 1 and Example 6, it can be seen that the welding beam current of the surface focus treatment in Example 1 is 20 mA, compared with 50 mA in Example 6, the helium leakage detection rate in Example 1 is 0.48×10 -12 Pa·m 3 / s, while the helium leakage detection rates in Example 6 were only 0.86×10 -12 Pa·m 3 / s, which shows that the present invention can further improve the tightness of welding and reduce the leakage rate of helium leakage detection by preferably adopting a suitable welding beam; by comparing Example 8 and Comparative Example 3, similar conclusions can be drawn, which will not be repeated here;
[0113] (5) Combining Example 1 and Comparative Example 2, it can be seen that in Comparative Example 2, the first connecting portion is perpendicular to the first arc-shaped portion, the second connecting portion is perpendicular to the second arc-shaped portion, and the helium leakage detection rate in Example 1 is 0.48×10 -12 Pa·m 3 / s, while the helium leak detection rate in Comparative Example 2 is as high as 7.32×10 -11 Pa·m 3 / s, which shows that the vacuum electron beam welding structure of the aluminum parts provided by the present invention has a reasonable designed weld structure and has the effect of higher welding tightness.
[0114] The present invention illustrates the detailed features of the present invention through the above embodiments, but the present invention is not limited to the above detailed features, that is, it does not mean that the present invention must rely on the above detailed features to be implemented. Those skilled in the art should understand that any improvement to the present invention, equivalent replacement of the technical features selected by the present invention, addition of auxiliary technical features, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.
Claims
1. A vacuum electron beam welding structure for aluminum parts, characterized in that: The cross section of the aluminum component is circular; The welding structure includes a first weld bead, a second weld bead and a third weld bead which are sequentially arranged on the surface to be welded of the aluminum component from the center of the circle from the inside to the outside in the radial direction; The first weld bead is multi-lobed; The second weld bead includes a first arc portion and a first connecting portion, the center of the first arc portion being the same as the center of the cross section of the aluminum component; The third weld bead includes a second arc portion and a second connecting portion, the center of the second arc portion is the same as the center of the cross section of the aluminum component; The first connection portion is connected to the second connection portion so that the first weld bead and the second weld bead form a closed area.
2. The welding structure according to claim 1, characterized in that: The number of the multi-leaf blades is at least three, and the multi-leaf blades are distributed at equal angles with respect to the center of the circle; Preferably, the radius of the circle of the cross section of the aluminum component is denoted as R, and half of the longest radial length of the multi-lobed shape is 0.4-0.5R.
3. The welding structure according to claim 1 or 2, characterized in that: The circular ring structure formed by the second weld bead and the third weld bead in the closed area has an opening; Preferably, the central angle corresponding to the arc of the opening is 5-20°.
4. The welding structure according to any one of claims 1 to 3, characterized in that: The radius of the circle of the cross section of the aluminum component is denoted as R, and the radial distance between the second weld bead and the third weld bead is 0.1 to 0.3R; Preferably, the radius of the second arc portion in the third weld bead is 0.8-0.95R.
5. The welding structure according to any one of claims 1 to 4, characterized in that: The groove of the welding structure is semicircular; Preferably, the radius of the semicircle is 0.5-1 mm.
6. The welding structure according to any one of claims 1 to 5, characterized in that: The first weld bead, the second weld bead and the third weld bead are each independently provided with a fixed rivet point.
7. A vacuum electron beam welding method for aluminum parts, characterized in that: The welding method is carried out using the vacuum electron beam welding structure for aluminum parts as described in any one of claims 1 to 6; In the welding method, welding is performed in the order of the third weld bead, the second weld bead and the first weld bead.
8. The vacuum electron beam welding method according to claim 7, characterized in that: The vacuum degree of the vacuum electron beam welding is less than 1×10 -2 Pa; Preferably, the acceleration voltage of the vacuum electron beam welding is 100-150 kV.
9. The vacuum electron beam welding method according to claim 7 or 8, characterized in that: The vacuum electron beam welding includes first setting a fixed riveting point, and then sequentially performing a surface focus treatment and a sinking focus treatment.
10. The vacuum electron beam welding method according to claim 9, characterized in that: The welding beam current of the fixed riveting point is 10-30mA; Preferably, the welding speed of the surface focus treatment is 10 to 25 mm / s; Preferably, the welding beam current of the surface focus treatment is 20-40 mA; Preferably, the welding speed of the coking treatment is 10 to 25 mm / s; Preferably, the welding beam current of the coking treatment is 30-60 mA.