CN115106638A - Welding method of thin-wall oxygen-free copper ring - Google Patents
Welding method of thin-wall oxygen-free copper ring Download PDFInfo
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- CN115106638A CN115106638A CN202210835365.0A CN202210835365A CN115106638A CN 115106638 A CN115106638 A CN 115106638A CN 202210835365 A CN202210835365 A CN 202210835365A CN 115106638 A CN115106638 A CN 115106638A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 238000003466 welding Methods 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000010894 electron beam technology Methods 0.000 claims abstract description 38
- 230000001133 acceleration Effects 0.000 claims description 11
- 210000001503 joint Anatomy 0.000 claims description 7
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 7
- 229910052802 copper Inorganic materials 0.000 description 15
- 239000010949 copper Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000012876 topography Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/04—Electron-beam welding or cutting for welding annular seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0033—Preliminary treatment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Welding Or Cutting Using Electron Beams (AREA)
Abstract
The present disclosure provides a welding method of a thin-wall oxygen-free copper ring, which can be applied to the technical field of welding of microwave vacuum electronic devices. The welding method comprises the following steps: pretreating the surface to be welded of the thin-wall oxygen-free copper ring; and welding the pretreated thin-wall oxygen-free copper ring by using an electron beam with preset parameters in a vacuum environment. The welding method provided by the disclosure can ensure that the precision of the thin-wall oxygen-free copper ring is realized in the welding process, and can obtain the electron beam welding line with uniform and attractive appearance.
Description
Technical Field
The disclosure relates to the technical field of microwave vacuum electronic devices, in particular to the technical field of welding of microwave vacuum electronic devices, and more particularly relates to a welding method of a thin-wall oxygen-free copper ring.
Background
The high-frequency structure of the microwave vacuum electronic device has large power capacity and the characteristic of convenient coupling with a mechanism, and the characteristic can directly influence the working frequency, the frequency bandwidth, the conversion efficiency, the output power and the like of a microwave system. Thus, the high frequency structure in microwave vacuum electronics determines the performance of the microwave system and is a core component of the system.
In the process of manufacturing and producing microwave vacuum electronic devices, when welding the oxygen-free copper material of the high-frequency structure, if the integral temperature of the high-frequency structure cannot be raised and the magnetic permeability of the metal part of the high-frequency structure cannot be influenced, the high-frequency structure of the oxygen-free copper material can only be locally welded.
In the related art, laser welding, high-frequency brazing, and argon arc welding are welding methods of local high temperature. However, the reflectivity of the oxygen-free copper material with the high-frequency structure to laser is higher than 50%, so that laser deep melting welding cannot be realized; the high-frequency brazing causes pollution to other parts and is not easy to control the welding quality when welding a high-frequency structure of the oxygen-free copper material; argon arc welding can cause the magnetic permeability of other metal parts of the high-frequency structure to be increased.
Specifically, when welding an oxygen-free copper material of a high-frequency structure, the problems of non-uniform melting of an oxygen-free copper welding seam, partial incomplete penetration, welding leakage, sinking and the like in the high-frequency structure need to be solved urgently. Especially for welding thin-walled oxygen-free copper rings.
Disclosure of Invention
In view of the above, the present disclosure provides a method of welding a thin-walled oxygen-free copper ring that improves the performance of microwave vacuum electronic devices.
The invention provides a welding method of a thin-wall oxygen-free copper ring, which comprises the following steps: pretreating the surface to be welded of the thin-wall oxygen-free copper ring; and welding the pretreated thin-wall oxygen-free copper ring by using an electron beam with preset parameters in a vacuum environment.
According to the embodiment of the disclosure, the pretreatment of the surface to be welded of the thin-wall oxygen-free copper ring comprises the following steps: the surfaces to be welded are degreased and de-oxidised.
According to the embodiment of the disclosure, welding the pretreated thin-wall oxygen-free copper ring by using the electron beam with preset parameters in the vacuum environment comprises the following steps: the degree of vacuum in the vacuum environment is 5X 10 -2 And (4) mounting the thin-wall oxygen-free copper ring on a rotating chuck under the Pa condition.
According to an embodiment of the present disclosure, the preset parameters include: an acceleration voltage parameter, a welding current parameter, a focusing current parameter, a rotational speed of the spin chuck, a beam rise time, and a beam fall time.
According to the embodiment of the disclosure, welding the pretreated thin-wall oxygen-free copper ring by using the electron beam with preset parameters in the vacuum environment comprises the following steps: the degree of vacuum in a vacuum environment is 5X 10 -2 Pa, the acceleration voltage parameter of the electron beam is 30-60 kV, the welding current parameter is 10-15 mA, the focusing current parameter is 450-700 mA, the beam rise time is 1.5-2.0s, the beam fall time is 1.5-2.0s, and the thin-wall oxygen-free copper ring is fixed by spot welding under the condition that the rotating speed of the rotating chuck is 25 mm/s.
According to the embodiment of the disclosure, welding the pretreated thin-wall oxygen-free copper ring by using the electron beam with preset parameters in the vacuum environment comprises the following steps: the degree of vacuum in the vacuum environment is 5X 10 -2 Pa, the acceleration voltage parameter of the electron beam is 30-60 kV, the welding current parameter is 20-30 mA, the focusing current parameter is 550-700 mA, the beam rise time is 1.5-2.0s, the beam fall time is 1.0-1.5s, and the rotation speed of the rotating chuck is 30 mm/s.
According to the embodiment of the disclosure, welding the pretreated thin-wall oxygen-free copper ring by using the electron beam with preset parameters in the vacuum environment comprises the following steps: the degree of vacuum in the vacuum environment is 5X 10 -2 Pa, electron beam acceleration voltage parameter of 50-60 kV, welding current parameter of 15-25 mA, focusing current parameter of 450-700 mA, beam rise time of 1.5-2.0s, beam fall time of 1.5-2.0s, and rotating chuckAnd performing modification welding on the thin-wall oxygen-free copper ring under the condition that the rotating speed is 40 mm/s.
According to the embodiment of the disclosure, welding the pretreated thin-wall oxygen-free copper ring by using the electron beam with preset parameters in the vacuum environment comprises the following steps: the degree of vacuum in the vacuum environment is 5X 10 -2 And under the condition of Pa, the joint mode of the thin-wall oxygen-free copper ring adopts a mutual-shaped lock bottom butt joint.
According to an embodiment of the present disclosure, a lock bottom butt joint includes: a joint with a thickness of 0.8-3 mm; and the lock bottom is matched with the joint, wherein the thickness of the lock bottom is 0.4-1.5 mm.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following description of embodiments of the disclosure, which proceeds with reference to the accompanying drawings, in which:
FIG. 1 schematically illustrates a flow chart of a method of welding a thin-walled oxygen-free copper ring according to an embodiment of the disclosure;
FIG. 2 schematically illustrates an assembled perspective view of a first thin-walled oxygen-free copper ring and a second thin-walled oxygen-free copper ring, according to an embodiment of the disclosure;
FIG. 3 schematically illustrates a front view of a first thin-walled oxygen-free copper ring and a second thin-walled oxygen-free copper ring, in accordance with an embodiment of the disclosure;
FIG. 4 schematically shows a cross-sectional view A-A of FIG. 3;
FIG. 5 schematically illustrates a schematic view of a weld between a first thin-walled oxygen-free copper ring and a second thin-walled oxygen-free copper ring, according to an embodiment of the disclosure;
FIG. 6 schematically illustrates a schematic of an oxygen-free copper ring weld cross-section micro-topography in accordance with an embodiment of the present disclosure;
figure 7 schematically illustrates a schematic view of an oxygen-free braze joint fracture micro-topography, in accordance with an embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
Where a convention analogous to "at least one of A, B and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B and C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).
The embodiment of the disclosure provides a welding method of a thin-wall oxygen-free copper ring, which comprises the steps of preprocessing the surface to be welded of the thin-wall oxygen-free copper ring; and welding the pretreated thin-wall oxygen-free copper ring by using an electron beam with preset parameters in a vacuum environment.
Vacuum electron beam welding in embodiments of the present disclosure is a high energy fusion welding technique in which a very dense high velocity electron stream is impinged on the metal being welded in a vacuum to heat, melt, and cool the metal for crystallization to form a weld. The vacuum electron beam welding has the characteristics of large depth-to-width ratio of welding seams, small heat affected zone, small deformation, high precision, vacuum environment oxidation prevention and the like, and can not affect the performance of other metals or ceramics in a high-frequency structure.
Particularly, the thin-wall oxygen-free copper ring is welded by using the electron beam in a vacuum environment, so that the thin-wall oxygen-free copper ring can be precisely welded in the welding process, and an electron beam welding seam with uniform and attractive appearance can be obtained. That is to say, the welded thin-wall oxygen-free copper ring does not have the phenomena of nonuniform weld melting, partial incomplete penetration, sunken weld leakage and the like, and the concentricity of the welded thin-wall oxygen-free copper ring is high. Namely, the welded thin-wall oxygen-free copper ring has flat and smooth welding seam, no burr and no needle hole.
The welding method in the embodiment of the disclosure is not limited to welding the thin-wall oxygen-free copper ring, and can also be used for welding a thin-wall oxygen-free copper pipe, a thin-wall oxygen-free copper plate and the like. It is to be noted that thin walls are to be understood as meaning that the thickness of the copper rings, copper plates and copper tubes is in the order of millimeters.
Fig. 1 schematically illustrates a flow chart of a method of welding a thin-walled oxygen-free copper ring according to an embodiment of the disclosure.
As shown in fig. 1, the welding method of the thin-wall oxygen-free copper ring of the embodiment of the present disclosure may include, for example, operation S101 to operation S102.
In operation S101, a surface to be welded of the thin-walled oxygen-free copper ring is pre-treated.
The surfaces to be welded are degreased and de-oxidised. Specifically, before welding the thin-wall oxygen-free copper ring, the surface to be welded is preprocessed, so that the influence of other substances on the surface to be welded on a welding seam is avoided, the structural strength between the thin-wall oxygen-free copper rings is further influenced, and the physical performance of the thin-wall oxygen-free copper rings is further influenced.
For example, the surfaces to be welded are degreased. Under the condition that lubricating oil is adhered to the surface to be welded of the thin-wall oxygen-free copper ring, welding cannot be carried out, so that the surface to be welded of the thin-wall oxygen-free copper ring needs to be subjected to deoiling treatment to ensure that the surface to be welded of the thin-wall oxygen-free copper ring is in an oil-free state.
For example, the surface to be soldered is de-oxidized. When the thin-wall oxygen-free copper ring is produced and manufactured, the surface of the thin-wall oxygen-free copper ring is inevitably oxidized in the atmospheric environment. When welding is directly performed on a thin-walled oxygen-free copper ring having an oxide layer, the oxide layer affects electron beams to melt the oxygen-free copper, that is, affects a fusion zone and a heat affected zone of the oxygen-free copper, and the like.
In operation S102, the pretreated thin-wall oxygen-free copper ring is welded by using an electron beam with preset parameters in a vacuum environment.
The welding method in the embodiments of the present disclosure is performed in a vacuum environment. The electron beam can form stable beam current in a vacuum environment. Meanwhile, the thin-wall oxygen-free copper rings are welded in a vacuum environment mainly to avoid oxidation of oxygen-free copper and further influence on structural strength between the thin-wall oxygen-free copper rings.
As shown in fig. 2 to 4, according to the welding method of the embodiment of the present disclosure, the vacuum degree of the electron gun is better than 7 × 10 -4 Pa, vacuum degree of the vacuum chamber is better than 5 x 10 -2 And in a Pa vacuum environment, forming a welding seam between the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2, installing the welding seam on a rotating chuck, butting the welding seam, and welding the pretreated thin-wall oxygen-free copper ring by using an electron beam with preset parameters.
The first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 are mutually-shaped lock bottom butt joints which are self-positioning welding joints and can be fastened in an annular welding line. The thickness of the joint is 0.8-3 mm, and the thickness of the lock bottom 4 is gradually increased from 0.4mm to 1.5 mm. That is to say, before the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 are welded by the electron beams, the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 can be concentrically positioned by adopting a butt joint mode of a lock bottom butt joint, and meanwhile, the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 can be automatically fastened in the welding process. That is, the concentricity between the first thin-walled oxygen-free copper ring 1 and the second thin-walled oxygen-free copper ring 2 is ensured, and the concentricity after welding between the first thin-walled oxygen-free copper ring 1 and the second thin-walled oxygen-free copper ring 2 is strengthened.
It is noted that the weld 3 between the first thin-walled oxygen-free copper ring 1 and the second thin-walled oxygen-free copper ring 2 cannot exceed 0.1 mm.
According to the embodiment of the disclosure, in order to enable the welding quality of the thin-wall oxygen-free copper ring to meet the requirement of a high-frequency structure of a microwave vacuum electronic device, electron beams with different parameters are set to weld the oxygen-free copper ring. Wherein, this welding process includes in proper order: spot welding, deep welding and finish welding.
(1) Spot welding fixture
When the electron beam just starts to weld the oxygen-free copper ring, the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 are fixed in advance, and the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 are prevented from being dislocated in the welding process, so that the concentricity between the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 is ensured.
Specifically, the degree of vacuum of the vacuum environment was set to 5 × 10 -2 Pa, the acceleration voltage parameter of the electron beam is 30-60 kV, the welding current parameter is 10-15 mA, the focusing current parameter is 450-700 mA, the beam rise time is 1.5-2.0s, the beam fall time is 1.5-2.0s, and the thin-wall oxygen-free copper ring is fixed by spot welding under the condition that the rotating speed of the rotating chuck is 25 mm/s.
(2) Deep welding
After the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 are fixed by spot welding through electron beams, the welding seam between the first thin-wall oxygen-free copper ring and the second thin-wall oxygen-free copper ring is deeply welded, so that the first thin-wall oxygen-free copper ring and the second thin-wall oxygen-free copper ring are completely welded together.
Specifically, the degree of vacuum of the vacuum environment was set to 5 × 10 -2 Pa, the acceleration voltage parameter of the electron beam is 30-60 kV, the welding current parameter is 20-30 mA, the focusing current parameter is 550-700 mA, the beam rise time is 1.5-2.0s, the beam fall time is 1.0-1.5s, and the rotation speed of the rotating chuck is 30 mm/s.
It should be noted that the deep welding means further welding the weld between the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 so that the two are completely welded together, and does not mean the depth of the weld.
(3) Touch-up welding
After the first thin-wall oxygen-free copper ring 1 and the second thin-wall oxygen-free copper ring 2 are deeply welded by using electron beams, the surface of a weld is uneven and unattractive, and the surface of the weld is trimmed by means of finish welding.
Specifically, the degree of vacuum in the vacuum environment is 5X 10 -2 Pa, the acceleration voltage parameter of the electron beam is 50-60 kV, the welding current parameter is 15-25 mA, the focusing current parameter is 450-700 mA, the beam rise time is 1.5-2.0s, the beam fall time is 1.5-2.0s, and the thin-wall oxygen-free copper ring is subjected to modified welding under the condition that the rotating speed of the rotating chuck is 40 mm/s.
According to an embodiment of the disclosure, the material of the first thin-walled oxygen-free copper ring 1 and the second thin-walled oxygen-free copper ring 2 is C10100, wherein the mass percentage composition of the C10100 oxygen-free copper is: cu: 99.995%, O: 0.0005%, Ag: 0.0025%, Pb: 0.005%, Ni: 0.001%, Sn: 0.0002 percent.
As shown in fig. 5, according to the embodiment of the present disclosure, the thin-walled oxygen-free copper ring is sequentially spot-welded, deeply welded, and finish-welded by using the electron beam, and the fusion zone in the weld 3 has a uniform width and a nail-shaped appearance. In addition, the welded thin-wall oxygen-free copper ring has flat and smooth welding seams, no burrs and no pinholes, the welding seams are melted uniformly, and the structural structure performance is improved.
FIG. 6 schematically illustrates a schematic representation of an oxygen-free copper ring weld cross-section micro-topography in accordance with an embodiment of the present disclosure.
According to the embodiment of the present disclosure, oxygen-free copper ring welding is performed using an electron beam welding machine of model HC-EBW-6 of Shichen Shichu technologies, Inc. The assembly process of the oxygen-free copper ring I and the oxygen-free copper II can be referred to as figure 1. A schematic cross-sectional view of the weld 4 is shown in figure 6.
Figure 7 schematically illustrates a schematic view of an oxygen-free braze joint fracture micro-topography, in accordance with an embodiment of the present disclosure.
As shown in FIG. 7, the tensile strength of the oxygen-free copper ring welded joint reaches 225MPa, the fracture surface of the parent metal is flat, and the uniformly distributed dimples are present. Thus, the plasticity of the welded joint is relatively good.
It will be appreciated by those skilled in the art that various combinations and/or combinations of the features recited in the various embodiments of the disclosure and/or the claims may be made even if such combinations or combinations are not explicitly recited in the disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit or teaching of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
The embodiments of the present disclosure have been described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination. The scope of the disclosure is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the present disclosure, and such alternatives and modifications are intended to be within the scope of the present disclosure.
Claims (9)
1. A welding method of a thin-wall oxygen-free copper ring comprises the following steps:
pretreating the surface to be welded of the thin-wall oxygen-free copper ring; and
and welding the pretreated thin-wall oxygen-free copper ring by using an electron beam with preset parameters in a vacuum environment.
2. The welding method of claim 1, wherein the pre-treating the to-be-welded surface of the thin-walled oxygen-free copper ring comprises:
and (3) deoiling and removing an oxidation layer on the surface to be welded.
3. The welding method of claim 2, wherein the welding the pre-treated thin-walled oxygen-free copper ring with an electron beam of preset parameters in a vacuum environment comprises:
the vacuum degree in the vacuum environment is 5 multiplied by 10 -2 And under the condition of Pa, mounting the thin-wall oxygen-free copper ring on a rotating chuck.
4. The welding method of claim 3, wherein the preset parameters comprise: an acceleration voltage parameter, a welding current parameter, a focusing current parameter, a rotational speed of the spin chuck, a beam rise time, and a beam fall time.
5. The welding method of claim 4, wherein the welding the thin-walled oxygen-free copper ring after pretreatment with an electron beam of preset parameters in a vacuum environment comprises:
the vacuum degree in the vacuum environment is 5 multiplied by 10 -2 Pa, the acceleration voltage parameter of the electron beam is 30-60 kV, the welding current parameter is 10-15 mA, the focusing current parameter is 450-700 mA, the beam rise time is 1.5-2.0s, the beam fall time is 1.5-2.0s, and the thin-wall oxygen-free copper ring is fixed by spot welding under the condition that the rotating speed of the rotating chuck is 25 mm/s.
6. The welding method of claim 4, wherein the welding the thin-walled oxygen-free copper ring after pretreatment with an electron beam of preset parameters in a vacuum environment comprises:
the vacuum degree in the vacuum environment is 5 multiplied by 10 -2 Pa, the acceleration voltage parameter of the electron beam is 30-60 kV, the welding current parameter is 20-30 mA, the focusing current parameter is 550-700 mA, the beam rise time is 1.5-2.0s, the beam fall time is 1.0-1.5s, and the thin-wall oxygen-free copper ring is deeply welded under the condition that the rotating speed of the rotating chuck is 30 mm/s.
7. The welding method of claim 4, wherein the welding the thin-walled oxygen-free copper ring after pretreatment with an electron beam of preset parameters in a vacuum environment comprises:
the vacuum degree in the vacuum environment is 5 multiplied by 10 -2 Pa, an acceleration voltage parameter of the electron beamAnd (2) performing modified welding on the thin-wall oxygen-free copper ring under the conditions that the voltage is 50-60 kV, the welding current parameter is 15-25 mA, the focusing current parameter is 450-700 mA, the beam rise time is 1.5-2.0s, the beam fall time is 1.5-2.0s and the rotating speed of the rotating chuck is 40 mm/s.
8. The welding method according to any one of claims 1-7, wherein said welding the pretreated thin-walled oxygen-free copper ring with an electron beam of preset parameters in a vacuum environment comprises:
the vacuum degree in the vacuum environment is 5 multiplied by 10 -2 And under the condition of Pa, the joint mode of the thin-wall oxygen-free copper ring adopts a mutual-shaped lock bottom butt joint.
9. The welding method of claim 8, wherein the butt-to-lock joint comprises:
a joint with a thickness of 0.8-3 mm; and
a lock bottom cooperating with the connector;
wherein, the thickness of lock bottom is 0.4 ~ 1.5 mm.
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