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Method for brazing and sealing palladium alloy thin-walled tube

A technology of thin-walled tubes and palladium alloys, applied in metal processing, tubular objects, welding equipment, etc., can solve problems such as low production efficiency, inaccurate heating and temperature control, and reduced purification performance, so as to achieve convenient positioning and clamping, and avoid mutual Uniform and reliable contact and weld seams

Active Publication Date: 2020-09-18
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The "heart" part of the high-purity hydrogen purification and separation device is the palladium alloy thin-walled diffusion tube assembly, which consists of a bundle of palladium alloy thin-walled tubes sealed at one end and welded to the flange. The wall thickness of the tube is generally less than 0.1mm, and it is impossible to seal the palladium alloy thin-walled tube with good airtightness by fusion welding
[0003] In the prior art, the sealing of the palladium alloy thin-walled tube mainly adopts the method of high-frequency induction local heating. First, the brazing wire is inserted into the cavity of the palladium alloy thin-walled tube, and then heated until the brazing wire melts and fills the cavity, and then Rapidly cool and solidify to form welding bolts for sealing. In high-frequency induction local heating, due to the presence of gas, the brazing wire absorbs air during melting and degasses during solidification, so the molten brazing wire will be released during solidification. Shrinkage cavity is generated, and at the same time, the gas in the cavity will form tiny micropores inside it during the formation of the welding plug. The connected micropores will cause leakage of the purification device, and the purification performance will be greatly reduced
In the prior art, silver solder is generally used for sealing, and the amount of solder used for a single plug is 1g to 2g, which is relatively large. In addition, in the prior art, only a single palladium alloy thin-walled tube can be sealed each time. Sealing, low production efficiency, and inaccurate temperature control in the heating and cooling process, resulting in different quality of the sealed palladium alloy thin-walled tubes

Method used

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  • Method for brazing and sealing palladium alloy thin-walled tube
  • Method for brazing and sealing palladium alloy thin-walled tube
  • Method for brazing and sealing palladium alloy thin-walled tube

Examples

Experimental program
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Effect test

Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1. Install the solder 3 around the upper end of the pipe head main body 1-2, and then insert the pipe head 1 into the palladium alloy thin-walled pipe 2, see figure 2 The diameter of the lower end surface of the pipe head cap 1-1 is 1 mm larger than the diameter of the cross section of the pipe head body 1-2; the diameter of the bottom surface of the pipe head tail 1-3 is larger than that of the pipe head The diameter of the cross section of the main body 1-2 is 0.3mm smaller; the palladium alloy thin-walled tube 2 is a palladium-yttrium alloy thin-walled tube of Φ2mm×0.08mm (outer diameter×wall thickness); the solder 3 has a quality of 0.2g AgCu28 welding wire; the material of the pipe head 1 is N6 grade pure nickel; the assembly gap between the pipe head 1 and the palladium alloy thin-walled pipe 2 is 0.02mm;

[0031] Step 2, the palladium alloy thin-walled tube 2 inserted into the tube head 1 in step 1 is ...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] Step 1. Install the solder 3 around the upper end of the pipe head and tail 1-3, and then insert the pipe head 1 into the palladium alloy thin-walled pipe 2, see image 3 The diameter of the lower end surface of the pipe head cap 1-1 is 1 mm larger than the diameter of the cross section of the pipe head body 1-2; the diameter of the bottom surface of the pipe head tail 1-3 is larger than that of the pipe head The diameter of the cross section of the main body 1-2 is 0.3mm smaller; the palladium alloy thin-walled tube 2 is a palladium-silver alloy thin-walled tube of Φ2mm×0.08mm (outer diameter×wall thickness); the solder 3 has a quality of 0.2g Ag foil strip; the material of the pipe head 1 is Monel 400 alloy; the assembly gap between the pipe head 1 and the palladium alloy thin-walled pipe 2 is 0.01mm;

[0036] Step 2, the palladium alloy thin-walled tube 2 inserted into the tube head 1 in step 1 is vertically put...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Step 1. Install the solder 3 around the upper end of the pipe head main body 1-2, and then insert the pipe head 1 into the palladium alloy thin-walled pipe 2; the diameter of the lower end surface of the pipe head cap 1-1 is The diameter of the cross-section of the main body 1-2 of the pipe head is 0.3 mm larger; the diameter of the upper bottom surface of the tail 1-3 of the pipe head is 1 mm smaller than the diameter of the cross-section of the main body 1-2 of the pipe head; the palladium The alloy thin-walled tube 2 is a palladium-copper alloy thin-walled tube of Φ2mm×0.08mm (outer diameter×wall thickness); the brazing material 3 is BCu62ZnNiMnSi-R solder paste with a quality of 0.3g; the material of the tube head 1 It is CuNi30 alloy; the assembly gap between the pipe head 1 and the palladium alloy thin-walled pipe 2 is 0.02mm;

[0041] Step 2, the palladium alloy thin-walled tube 2 inserted into the tube head...

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Abstract

The invention discloses a method for brazing and sealing a palladium alloy thin-walled tube. The method comprises the steps that 1, brazing filler metal is installed on a tube closure head, and then the tube closure head installed with the brazing filler metal is inserted into the palladium alloy thin-walled tube, wherein the tube closure head is composed of a tube closure head cap, a tube closurehead body and a tube closure head tail; and 2, the palladium alloy thin-walled tube with the tube closure head inserted is placed in a vacuum brazing furnace for brazing, and a palladium alloy thin-walled tube sealed with brazing is obtained. The brazing filler metal is firstly installed on the tube closure head, then the tube closure head is inserted into the palladium alloy thin-walled tube, and then brazing treatment is performed. After the brazing filler metal is melted and fills assembly gaps, the tube is cooled to room temperature, the brazing and sealing of the palladium alloy thin-walled tube is realized, the brazing and sealing of the palladium alloy thin-walled tube in batches is realized, and the production efficiency of the brazing and sealing of the palladium alloy thin-walled tube is improved. The tube closure head adopted by the invention has simple structure and low processing cost, reduces the amount of the brazing filler metal, and reduces the cost. An obtained brazed sealing end has high strength and good air tightness.

Description

technical field [0001] The invention belongs to the technical field of sealing of thin-walled tubes, and in particular relates to a method for brazing sealing of palladium alloy thin-walled tubes. Background technique [0002] The "heart" part of the high-purity hydrogen purification and separation device is the palladium alloy thin-walled diffusion tube assembly, which consists of a bundle of palladium alloy thin-walled tubes sealed at one end and welded to the flange. The wall thickness of the tube is generally less than 0.1mm, and the palladium alloy thin-walled tube cannot be sealed with good airtightness by fusion welding. [0003] In the prior art, the sealing of the palladium alloy thin-walled tube mainly adopts the method of high-frequency induction local heating. First, the brazing wire is inserted into the cavity of the palladium alloy thin-walled tube, and then heated until the brazing wire melts and fills the cavity, and then Rapidly cool and solidify to form we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K33/00B23K101/06
CPCB23K1/0008B23K1/008B23K33/006B23K2101/06
Inventor 贾志华操齐高郑晶王轶姜婷李银娥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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