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Welding method for composite cavity sheets of high-power coupled-cavity traveling-wave tube

A welding method and composite cavity technology, applied in welding equipment, welding/welding/cutting items, non-electric welding equipment, etc., can solve problems such as slowness, surface contamination of parts, and difficulty in filling solder grooves and parts gaps with solder

Active Publication Date: 2014-02-12
NANJING SANLE ELECTRONICS INFORMATION IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The gas in the "dead space" cannot be removed through the vacuum degassing and exhaust process. During the use of the traveling wave tube, this part of the gas will slowly enter the tube through permeation, etc., so that the vacuum degree in the tube will drop. The wave tube will not work properly;
[0007] 3) Sometimes there will be solder accumulation, and secondary processing is required;
[0008] 4) The composite cavity piece is brazed by a hydrogen furnace, and it is difficult for the solder to fill the solder tank and the gap between the parts. After electroplating, there is often residual solution in the gap in the subsequent process. After the coating is sintered, the surface of the part will be polluted, requiring multiple rework , very low production efficiency

Method used

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  • Welding method for composite cavity sheets of high-power coupled-cavity traveling-wave tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1, a kind of welding method of the composite cavity sheet of high-power coupling cavity traveling wave tube, it is characterized in that, it comprises the following steps:

[0037] a. Cleaning of pure iron large cavity sheet (1):

[0038] The specific steps are: take the pure iron cavity sheet (1) and soak it with trichlorethylene for 30 minutes, then take it out and put it into an ultrasonic instrument and ultrasonically clean it in an alkali cleaning solution for 30 minutes, rinse it with tap water, take it out and soak it in 50% hydrochloric acid 3 minutes, after rinsing, immerse in ethanol for dehydration, and then dry it to realize the cleaning of pure iron cavity sheet (1);

[0039] b. Cleaning of the oxygen-free copper cavity ring (2):

[0040] The specific steps are: take the oxygen-free copper cavity ring (2) and put it into an ultrasonic instrument and ultrasonically clean it in an alkaline cleaning solution for 30 minutes, then take it out and polish it wit...

Embodiment 2

[0051] A welding method for a composite cavity sheet of a high-power coupling cavity traveling wave tube, comprising the following steps:

[0052] a. Cleaning of pure iron large cavity sheet (1):

[0053] The specific steps are: take the pure iron cavity sheet (1) and soak it with trichlorethylene for 60 minutes, then take it out and put it into an ultrasonic instrument and ultrasonically clean it in an alkali cleaning solution for 60 minutes, rinse it with tap water, take it out and soak it in 60% hydrochloric acid 5 minutes, after rinsing, immerse in ethanol for dehydration, and then perform drying treatment to realize the cleaning of pure iron cavity sheet (1);

[0054] b. Cleaning of the oxygen-free copper cavity ring (2):

[0055] The specific steps are: take the oxygen-free copper cavity ring (2) and put it into an ultrasonic instrument to ultrasonically clean it in an alkaline cleaning solution for 60 minutes, then take it out and polish it with a nitric acid polishin...

Embodiment 3

[0065] Embodiment 3 performance test

[0066] Take the composite cavity sheet prepared in Example 1 of the present invention and assemble the slow wave line, and then use a Varian leak detector to detect leaks on the slow wave line combination. The experimental results show that the leak rate is less than 1×10 -11 Pa.m 3 / s.

[0067] In addition, the slow wave line equipped with the composite cavity plate provided by the present invention is assembled to a high-power coupling cavity traveling wave tube. The experimental test results show that the working ratio of the coupling cavity traveling wave tube is 8%, and the pulse output power is 50kW. A very good technical effect.

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Abstract

The invention discloses a welding method for composite cavity sheets of a high-power coupled-cavity traveling-wave tube. According to the method, a process for cleaning an oxygen-free copper cavity ring and pure-iron large cavity sheets before vacuum diffusion welding and a specific heating program and a pressurization program during the vacuum diffusion welding are screened through a large number of experiments. Experimental results show that the composite cavity sheets prepared with the method are good in welding joint quality, high in strength and welding accuracy and small in deformation and can overcome phenomena of 'dead space' and pollution in the prior art; and according to the welding method, a plurality of composite cavity sheets can be welded for one time, the production efficiency is higher, and the consistency of batch production is good. Besides, the experimental results show that the composite cavity sheets which are prepared with the vacuum diffusion welding are assembled, and characteristics of slow wave lines, such as small standing-wave ratio and high output power of the coupled cavity traveling-wave tube are obtained; and very good technical effects are acquired.

Description

technical field [0001] The invention relates to a method for preparing a high-power coupling cavity traveling wave tube fitting of an electron tube device, in particular to a welding method for a composite cavity sheet of a high-power coupling cavity traveling wave tube. Background technique [0002] The coupled cavity traveling wave tube is currently the most important high-power microwave amplifier device, and has been widely used in radar, communication, and electronic countermeasure research. Among them, the key component used in the coupling cavity traveling wave tube - the composite cavity sheet, that is, a layer of oxygen-free copper is coated on the surface of the pure iron cavity sheet, which utilizes the excellent thermal conductivity of copper to make the heat dissipation in the tube good. Common copper clad processes include evaporation coating, sputtering coating, electroplating, etc. Since these three methods are thin-film processes, they cannot meet the heat d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/14B23K20/24
CPCB23K20/001B23K20/14B23K20/227B23K20/24B23K2103/22
Inventor 董笑瑜梁田王爱美季大习
Owner NANJING SANLE ELECTRONICS INFORMATION IND GRP
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