Welding tool and welding method for superconducting cavity beam HOM pipe welding part

Abstract

A superconducting cavity beam HOM pipe welding piece welding tool comprises a tool body, a tool pressing plate, a beam pipe positioning assembly and a pull rod. The tool body is in an L shape, the tool pressing plate is vertically arranged along one side of the tool body, so that the tool pressing plate and the tool body form a U-shaped structure, the beam pipe positioning assembly is vertically installed on the tool body and used for fixing a beam pipe welding part to the tool body in the arrangement direction of the tool pressing plate, and the pull rod is installed between the tool pressing plate and the tool body. And the tool pressing plate can enable the welding part of the HOM pipe welding part and the welding part of the beam pipe welding part to abut against each other. The invention further provides a welding method for the superconducting cavity beam HOM pipe welding part. In the welding process, the welding part of the HOM pipe welding part and the welding part of the beam pipe welding part can be effectively positioned, the welding precision is guaranteed, and the welding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting cavities, and in particular to a welding tool and a welding method for a superconducting cavity beam HOM tube welding piece. Background Art

[0002] With the development of accelerator technology, accelerators are increasingly used in scientific research, medical treatment, environmental protection and other fields. According to the needs of different fields, various technical requirements are put forward for accelerators. The 3.9GHz 9cell superconducting cavity is a cavity type required by the Shanghai Hard X-ray Free Electron Laser Device Project (SHINE). The entire project requires two modules of this type of superconducting cavity. The RF superconducting cavity is made of multiple niobium and niobium-titanium alloy parts welded by vacuum electron beam.

[0003] The 3.9GHz 9cell superconducting cavity is welded with high-purity niobium materials with RRR (residual resistivity)>300. In order to avoid oxidation of the material and loss of low-temperature superconductivity of the niobium material, all welding is performed by electron beam welding in a vacuum environment, so the vacuum degree must meet certain requirements during welding. Among them, the HOM (high-order mode coupler) welding assembly is an important part of the end cavity.

[0004] This type of cavity is mainly used in high-beta accelerators and belongs to the Shanghai Hard X-ray Project (SHINE). The end cavity is composed of beam tubes, HOM tubes, coupling tubes and other components. Since this type of superconducting cavity is developed for the first time in China, there is currently no similar implementation plan. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned technologies, it is necessary to provide a welding tool for superconducting cavity beam HOM tube welding parts.

[0006] A superconducting cavity beam HOM tube welding piece welding tool, comprising a tool body, a tool pressure plate, a beam tube positioning assembly, and a pull rod; the tool body is L-shaped, the tool pressure plate is vertically arranged along one side of the tool body, so that the tool pressure plate and the tool body form a U-shaped structure, the beam tube positioning assembly is vertically installed on the tool body, and is used to fix the beam tube welding piece on the tool body along the setting direction of the tool pressure plate, and the pull rod is installed between the tool pressure plate and the tool body, so that the tool pressure plate can press the welding part of the HOM tube welding piece against the welding part of the beam tube welding piece.

[0007] Preferably, a clamping base perpendicular to the axis of the beam tube positioning assembly is provided on the outer side of the tool body.

[0008] Preferably, the beam tube positioning assembly includes a positioning rod and a positioning plate; the positioning rod is vertically mounted on the tooling body, and the positioning plate is sleeved on the upper end of the positioning rod, so that the beam tube welding part is fixed to the tooling body through the mutual cooperation of the positioning rod and the positioning plate.

[0009] Preferably, a positioning groove adapted to the beam tube welding piece is provided on the tool body.

[0010] Preferably, a limiting groove is provided on a surface of one side of the tooling pressure plate facing the clamping base.

[0011] Preferably, the pull rod is a screw rod.

[0012] It is also necessary to provide a welding method for superconducting cavity beam HOM tube welding parts.

[0013] A superconducting cavity beam HOM tube welding method is provided, which uses the superconducting cavity beam HOM tube welding tooling described above to perform welding, and comprises the following steps: Step S1: Assemble and fix the tool body and the clamping base together with bolts; Step S2: placing the welded and assembled beam tube weldment into the positioning groove on the tooling body, and fixing the beam tube weldment in the positioning groove using a beam tube positioning assembly, ensuring that the welding part of the beam tube weldment is concentric with the clamping base; Step S3: placing the HOM tube weldment into the limiting groove, and assembling the HOM tube weldment and the beam tube weldment using a tooling pressing plate and a pull rod, ensuring that the welding part of the HOM tube weldment and the welding part of the beam tube weldment are against each other; Step S4: Loading into the welding chamber of the electron beam welding machine, after vacuuming to meet the process requirements, spot welding at 4 points symmetrically at the welding position, with a spot welding distance of 5-10mm at each point; Step S5: After the spot welding is completed, the welding machine is cooled for 10 minutes, the tie rod is removed, and the welding machine is evacuated again to weld the welding part as a whole, and finally the welding of the HOM tube weldment and the beam tube weldment is completed.

[0014] Preferably, in step S4, the welding process indicators are as follows: vacuum degree is less than 5×10-3Pa, HV (voltage) = 150kV, IB (beam current) = 10mA, and IL (focusing current) is 50-70mA at the upper focus.

[0015] Preferably, in step S5, the welding part is welded as a whole in the following manner: When the vacuum degree reaches less than 5×10-3Pa, formal welding begins. First, the weld bead is closed and then the formal welding is carried out: Closed welding: HV (voltage) = 150kV, IB (beam current) = 10-11mA, AC = 2.5mm (the beam spot is scanned in a circular shape, and its scanning diameter is abbreviated as AC), F (welding speed) = 6mm / s; Formal welding: HV (voltage) = 150kV, IB (beam current) = 14-15mA, AC = 2.5mm, F (welding speed) = 6mm / s; After welding is completed, cool for more than 30 minutes to break the vacuum and complete the welding of the HOM tube weldment and the beam tube weldment.

[0016] Preferably, in step S2, the beam tube welding piece is welded in the following manner:

[0017] S21: Assemble and fix the tool body and the clamping base together with bolts; S22: placing the beam tube into the positioning groove on the tooling body, and fixing the beam tube in the positioning groove using the beam tube positioning assembly, ensuring that the welding part of the beam tube is concentric with the clamping base; S23: Place the coupling tube into the limiting groove, and assemble the coupling tube and the beam tube using a tooling pressing plate and a pull rod, ensuring that the welding part of the coupling tube and the welding part of the beam tube are against each other; S24: Load into the welding chamber of the electron beam welder, after vacuuming to meet the process requirements, spot weld symmetrically at 4 points on the welding part, with a spot welding distance of 5-10mm at each point; S25: After the spot welding is completed, cool for 10 minutes, break the welder, remove the tie rod, evacuate the welder again, weld the welding part as a whole, and finally complete the final welding of the beam tube and the coupling tube.

[0018] Compared with the prior art, the present invention provides a superconducting cavity beam HOM tube welding piece welding tool and welding method, comprising a tool body, a tool pressure plate, a beam tube positioning assembly, and a pull rod; the tool body is L-shaped, the tool pressure plate is vertically arranged along one side of the tool body, so that the tool pressure plate and the tool body form a U-shaped structure, the beam tube positioning assembly is vertically installed on the tool body, and is used to fix the beam tube welding piece on the tool body along the setting direction of the tool pressure plate, and the pull rod is installed between the tool pressure plate and the tool body, so that the tool pressure plate can press the welding part of the HOM tube welding piece against the welding part of the beam tube welding piece; thereby, during the welding process, the welding part of the HOM tube welding piece and the welding part of the beam tube welding piece can be effectively positioned, thereby ensuring the welding accuracy and improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 For the present invention Figure 1 Schematic diagram of the structure from another angle.

[0022] Figure 3 It is a structural schematic diagram of the tooling body of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the tooling pressing plate of the present invention.

[0024] Figure 5 It is a structural schematic diagram of the tooling body and the clamping base when assembled.

[0025] Figure 6 This is a schematic diagram of the structure when assembling the beam tube welding parts, the tooling body, and the beam tube positioning assembly.

[0026] Figure 7 This is a schematic diagram of the structure when the pull rod is removed and the overall welding is carried out.

[0027] In the figure: tooling body 01, positioning groove 11, tooling pressure plate 02, limiting groove 21, beam tube positioning assembly 03, positioning rod 31, positioning plate 32, pull rod 04, clamping base 05, beam tube welding part 06, beam tube 61, coupling tube 62, HOM tube welding part 07. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0030] Please see Figures 1 to 4 In one embodiment, the present invention provides a superconducting cavity beam HOM tube welding piece welding tool, including a tool body 01, a tool pressure plate 02, a beam tube positioning assembly 03, and a pull rod 04; the tool body 01 is L-shaped, the tool pressure plate 02 is vertically arranged along one side of the tool body 01, so that the tool pressure plate 02 and the tool body 01 form a U-shaped structure, the beam tube positioning assembly 03 is vertically installed on the tool body 01, and is used to fix the beam tube welding piece 06 on the tool body 01 along the setting direction of the tool pressure plate 02, and the pull rod 04 is installed between the tool pressure plate 02 and the tool body 01, so that the tool pressure plate 02 can press the welding part of the HOM tube welding piece 07 against the welding part of the beam tube welding piece 06; thereby, during the welding process, the welding part of the HOM tube welding piece 07 and the welding part of the beam tube welding piece 06 can be effectively positioned, thereby ensuring the welding accuracy and improving the welding efficiency. Of course, the pull rod 04 can be a screw rod, which is convenient for fastening the nut and also for disassembly and assembly.

[0031] In one embodiment, a clamping base 05 perpendicular to the axis of the beam tube positioning assembly 03 is provided on the outer side of the tool body 01 .

[0032] In one embodiment, the beam tube positioning assembly 03 includes a positioning rod 31 and a positioning plate 32; the positioning rod 31 is vertically mounted on the tooling body 01, and the positioning plate 32 is sleeved on the upper end of the positioning rod 31, so that the beam tube welding part 06 is fixed to the tooling body 01 through the mutual cooperation of the positioning rod 31 and the positioning plate 32. During installation, the positioning rod 31 passes along the axis of the beam tube welding part 06, and one end of the positioning rod 31 is fastened to the tooling body 01 by a nut, and the other end of the positioning rod 31 extends out of the upper end of the beam tube welding part 06, and the positioning plate 32 is pressed on the upper end of the beam tube welding part 06 and fastened by a nut, thereby achieving the fixation of the beam tube welding part 06 to the tooling body 01.

[0033] A positioning groove 11 adapted to the beam tube welding piece 06 is provided on the tool body 01. When the beam tube welding piece 06 is fixed, the positioning groove 11 can be used to achieve positioning.

[0034] A limiting groove 21 is provided on the surface of the tooling pressing plate 02 facing the clamping base 05 ; the limiting groove 21 can be used to facilitate positioning of the HOM tube welding part 07 during installation.

[0035] A superconducting cavity beam HOM tube welding part welding method, using a superconducting cavity beam HOM tube welding part welding tool for welding, comprises the following steps: Step S1: Please refer to Figure 5 , assemble and fix the tool body 01 and the clamping base 05 together with bolts; Step S2: Please refer to Figure 6 , put the welded and assembled beam tube welding part 06 into the positioning groove 11 on the tooling body 01, and fix the beam tube welding part 06 in the positioning groove 11 using the beam tube positioning assembly 03, ensuring that the welding part of the beam tube welding part 06 is concentric with the clamping base 05; Step S3: See Figure 2 , put the HOM tube welding part 07 into the limiting groove 21, and use the tooling pressing plate 02 and the pull rod 04 to assemble the HOM tube welding part 07 and the beam tube welding part 06, ensuring that the welding part of the HOM tube welding part 07 and the welding part of the beam tube welding part 06 are against each other; Step S4: Loading into the welding chamber of the electron beam welding machine, after vacuuming to meet the process requirements, spot welding at 4 points symmetrically at the welding position, with a spot welding distance of 5-10mm at each point; Step S5: Please refer to Figure 7 After the spot welding is completed, cool for 10 minutes, break the welder, remove the pull rod 04, evacuate the welder again, weld the welding part as a whole, and finally complete the welding of the HOM tube weldment 07 and the beam tube weldment 06.

[0036] Specifically, in step S4, the welding process indicators are as follows: vacuum degree is less than 5×10-3Pa, HV (voltage) = 150kV, IB (beam current) = 10mA, and IL (focusing current) is 50-70mA at the upper focus.

[0037] Specifically, in step S5, the welding part is welded as a whole in the following manner: When the vacuum degree reaches less than 5×10-3Pa, formal welding begins. First, the weld bead is closed and then the formal welding is carried out: Closed welding: HV (voltage) = 150kV, IB (beam current) = 10-11mA, AC = 2.5mm (the beam spot is scanned in a circular shape, and its scanning diameter is abbreviated as AC), F (welding speed) = 6mm / s; Formal welding: HV (voltage) = 150kV, IB (beam current) = 14-15mA, AC = 2.5mm, F (welding speed) = 6mm / s; After welding is completed, cool for more than 30 minutes to break the vacuum, and complete the welding of the HOM tube welding part 07 and the beam tube welding part 06.

[0038] Specifically, in step S2, the beam tube welding member 106 is welded in the following manner:

[0039] Assemble and fix the tool body 01 and the clamping base 05 together with bolts; Place the beam tube 61 into the positioning groove 11 on the tooling body 01, and fix the beam tube 61 in the positioning groove 11 using the beam tube positioning assembly 03, ensuring that the welding part of the beam tube 61 is concentric with the clamping base 05; Put the coupling tube 62 into the limiting groove 21, and use the tooling pressing plate 02 and the pull rod 04 to assemble the coupling tube 62 and the beam tube 61, ensuring that the welding part of the coupling tube 62 is against the welding part of the beam tube 61; Load into the welding chamber of the electron beam welder. After the vacuum is exhausted to meet the process requirements, spot weld symmetrically at 4 points on the welding part, with a spot welding distance of 5-10mm at each point. The welding process indicators are as follows: vacuum degree is less than 5×10-3Pa, HV (voltage) = 150kV, IB (beam current) = 10mA, IL (focusing current) is 50-70mA for the upper focus; After the spot welding is completed, the welding machine is cooled for 10 minutes, the tie rod 04 is removed, and the welding machine is evacuated again to weld the welding part as a whole, and finally the final welding of the beam tube 61 and the coupling tube 62 is completed.

[0040] When the vacuum degree reaches less than 5×10-3Pa, formal welding begins. First, the weld bead is closed and then the formal welding is carried out: Closed welding: HV (voltage) = 150kV, IB (beam current) = 10-11mA, AC = 2.5mm (the beam spot is scanned in a circular shape, and its scanning diameter is abbreviated as AC), F (welding speed) = 6mm / s; Formal welding: HV (voltage) = 150kV, IB (beam current) = 14-15mA, AC = 2.5mm, F (welding speed) = 6mm / s; After the welding is completed, the vacuum is broken after cooling for more than 30 minutes, and the welding of the beam tube 61 and the coupling tube 62 is completed.

[0041] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A welding tool for superconducting cavity beam HOM tube welding parts, characterized in that: It includes a tooling body, a tooling pressure plate, a beam tube positioning assembly, and a pull rod; the tooling body is L-shaped, the tooling pressure plate is vertically arranged along one side of the tooling body, so that the tooling pressure plate and the tooling body form a U-shaped structure, the beam tube positioning assembly is vertically installed on the tooling body, and is used to fix the beam tube welding part on the tooling body along the setting direction of the tooling pressure plate, and the pull rod is installed between the tooling pressure plate and the tooling body, so that the tooling pressure plate can press the welding part of the HOM tube welding part against the welding part of the beam tube welding part.

2. The superconducting cavity beam HOM tube welding tool according to claim 1 is characterized in that: A clamping base perpendicular to the axis of the beam tube positioning assembly is arranged on the outer side of the tool body.

3. The superconducting cavity beam HOM tube welding tool according to claim 1 is characterized in that: The beam tube positioning assembly includes a positioning rod and a positioning plate; the positioning rod is vertically installed on the tooling body, and the positioning plate is sleeved on the upper end of the positioning rod, so that the beam tube welding part is fixed on the tooling body through the mutual cooperation of the positioning rod and the positioning plate.

4. The superconducting cavity beam HOM tube welding tool according to claim 3 is characterized in that: The tool body is provided with a positioning groove adapted to the beam tube welding piece.

5. The superconducting cavity beam HOM tube welding tool according to claim 2 is characterized in that: A limiting groove is provided on a surface of the tooling pressing plate on one side facing the clamping base.

6. The superconducting cavity beam HOM tube welding tool according to claim 1, characterized in that: The pull rod is a screw rod.

7. A method for welding a superconducting cavity beam HOM tube weldment, using the superconducting cavity beam HOM tube weldment welding tool as claimed in any one of claims 1 to 6 for welding, characterized in that: The following steps are included: Step S1: Assemble and fix the tool body and the clamping base together with bolts; Step S2: placing the welded and assembled beam tube weldment into the positioning groove on the tooling body, and fixing the beam tube weldment in the positioning groove using a beam tube positioning assembly, ensuring that the welding part of the beam tube weldment is concentric with the clamping base; Step S3: placing the HOM tube weldment into the limiting groove, and assembling the HOM tube weldment and the beam tube weldment using a tooling pressing plate and a pull rod, ensuring that the welding part of the HOM tube weldment and the welding part of the beam tube weldment are against each other; Step S4: Loading into the welding chamber of the electron beam welding machine, after vacuuming to meet the process requirements, spot welding at 4 points symmetrically at the welding position, with a spot welding distance of 5-10mm at each point; Step S5: After the spot welding is completed, the welding machine is cooled for 10 minutes, the tie rod is removed, and the welding machine is evacuated again to weld the welding part as a whole, and finally the welding of the HOM tube weldment and the beam tube weldment is completed.

8. The superconducting cavity beam HOM tube welding method according to claim 7, characterized in that: In step S4, the welding process indicators are as follows: vacuum degree is less than 5×10-3Pa, HV (voltage) = 150kV, IB (beam current) = 10mA, and IL (focusing current) is 50-70mA at the upper focus.

9. The superconducting cavity beam HOM tube welding method according to claim 8, characterized in that: In step S5, the welding part is welded as a whole in the following manner: When the vacuum degree reaches less than 5×10-3Pa, formal welding begins. First, the weld bead is closed and then the formal welding is carried out: Closed welding: HV (voltage) = 150kV, IB (beam current) = 10-11mA, AC = 2.5mm (the beam spot is scanned in a circular shape, and its scanning diameter is abbreviated as AC), F (welding speed) = 6mm / S; Formal welding: HV (voltage) = 150kV, IB (beam current) = 14-15mA, AC = 2.5mm, F (welding speed) = 6mm / S; After welding is completed, cool for more than 30 minutes to break the vacuum and complete the welding of the HOM tube weldment and the beam tube weldment.

10. The superconducting cavity beam HOM tube welding method according to claim 9, characterized in that: In step S2, the beam tube welding parts are welded in the following manner: S21: Assemble and fix the tool body and the clamping base together with bolts; S22: placing the beam tube into the positioning groove on the tooling body, and fixing the beam tube in the positioning groove using the beam tube positioning assembly, ensuring that the welding part of the beam tube is concentric with the clamping base; S23: Place the coupling tube into the limiting groove, and assemble the coupling tube and the beam tube using a tooling pressing plate and a pull rod, ensuring that the welding part of the coupling tube and the welding part of the beam tube are against each other; S24: Load into the welding chamber of the electron beam welder, and after vacuuming to meet the process requirements, perform spot welding at 4 points symmetrically at the welding position, with a spot welding distance of 5-10mm at each point; S25: After the spot welding is completed, cool for 10 minutes, break the welder, remove the tie rod, evacuate the welder again, weld the welding part as a whole, and finally complete the final welding of the beam tube and the coupling tube.

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