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An isolation method for vacuum diffusion welding

A technology of vacuum diffusion and welded parts, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc. It can solve the problems of complex process, easy breaking of ceramic sheets, and easy raising of graphite powder, etc., and achieves simple welding operation and coating The effect of controllable thickness and good isolation effect

Active Publication Date: 2021-12-21
AVIC LIYUAN HYDRAULIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The isolation method of existing vacuum diffusion welding is to adopt graphite powder, ceramic sheet or stainless steel sheet as isolation material, under vacuum environment, forms isolation layer between frock and welded part or between adjacent group welded parts, but graphite powder is easy Lifting will pollute the welding equipment and change the vacuum degree, which will have a negative impact on the welding effect, so the welding equipment needs to be cleaned frequently, which makes the welding operation very troublesome; ceramic chips are easy to break and cannot be used for complex special-shaped structures The welding between welding parts has a narrow scope of application; the stainless steel sheet needs to be oxidized and heat treated, the process is complicated and the cost is high
[0004] Therefore, the existing vacuum diffusion welding isolation method has the disadvantages of making subsequent welding operations troublesome, narrow in scope of application, or high in cost.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1. It is used for the isolation layer used in the welding and forming of the existing bimetallic copper-steel rotor with special-shaped structure (such as YZBXXX-4001 (H) rotor), such as figure 1 As shown, the existing bimetallic copper-steel rotor tooling includes a tapered pressure column 1 and an outer circular clamp 2, and a group of welded parts constituting the bimetallic copper-steel rotor are respectively welded copper sleeves 3 with tapered inner holes. , welded steel matrix 4 and welded copper plate 5; when the special-shaped structure bimetallic copper-steel rotor is welded and formed, the welding equipment applies pressure downward through the pressure column 1, so that the welded steel matrix 4 and the welded copper plate 5 are in close contact, and the pressure column 1 is pressed down. At the same time, the welded copper sleeve 3 is in close contact with the welded steel substrate 4 , and the outer circular clamp 2 is used to limit the position of...

Embodiment 2

[0029] Example 2. It is used for the isolation layer used in the welding and forming of the existing flat structure copper-steel pressing plate (YZBXX-3212 (H) pressing plate). figure 2 As shown, the two sets of weldments are stacked and welded at the same time, and the welding equipment is used to apply pressure downward to the stacked two sets of weldments, so that the weldments are in close contact. The existing process requirement is that an isolation layer needs to be formed between the two sets of weldments.

[0030] An isolation method for vacuum diffusion welding, comprising the following steps,

[0031] a. In parts by weight, pour 1000 parts of hot water not lower than 60°C into the container to obtain product A,

[0032] b. Pour 60, 70, 85, 100 or 110 parts (optimally 85 parts) of water glass into product A, and stir while pouring until the water glass dissolves to obtain product B.

[0033] c. Pour 50, 60, 70, 80 or 90 parts (optimally 70 parts) of zinc oxide po...

Embodiment 3

[0036] Example 3. Carry out with reference to embodiment 1, the difference is that the object of action is changed, the bimetallic copper-steel rotor is changed into a bimetallic titanium steel rotor, that is, the materials of the welded copper sleeve 3 and the welded copper plate 5 are all changed into titanium.

[0037] In step f of the isolation method, the spray thickness was changed to 0.1 mm.

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Abstract

The invention discloses an isolation method for vacuum diffusion welding. A mixed solution is used as an isolation material to form an isolation layer between tooling and welded parts or between adjacent welded parts; the components of the mixed solution are calculated by weight In terms of parts, it includes 50-90 parts of zinc oxide powder, 90-110 parts of calcium carbonate, 60-110 parts of water glass, and 1000 parts of hot water not lower than 60°C. The invention has the advantages of simple subsequent welding operation, wide application range and low cost.

Description

technical field [0001] The invention belongs to the field of vacuum diffusion welding, in particular to an isolation method of vacuum diffusion welding. Background technique [0002] Vacuum diffusion welding is suitable for the welding and forming of bimetallic parts with flat plates or special-shaped structures. Two or more weldments are used as a group, and each group of weldments is welded to obtain a bimetallic part. Vacuum diffusion welding can provide high-quality welds , and ensure that the matrix does not melt or overheat. For example, it is used for the welding of copper-steel bimetallic rotors for hydraulic pumps. Two copper welds and one steel weld are used as a set of welds. After welding, copper Steel bimetallic rotor. In the vacuum diffusion welding process, tooling is sometimes required to apply loads to the welded parts or to prevent deformation and limit the tooling. In the actual production process, the tooling needs to be isolated, that is, set up Isolat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/02B23K20/14B23K20/26
CPCB23K20/026B23K20/14B23K20/26
Inventor 唐江滕海山张洪珍吴小芳杨先
Owner AVIC LIYUAN HYDRAULIC
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