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Vacuum brazing method suitable for closed cavity multi-welding-seam structure

A brazing method and closed cavity technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of complex weld structure, uneven weld gap, and inability to fill in brazing material.

Inactive Publication Date: 2021-05-11
楼蓝科技(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct brazing often leads to uneven weld gaps. When the gap on one side of the weld gap is small, the solder cannot be filled into the weld, resulting in unwelded defects, and the airtight or oil-tight effect cannot be achieved; at the same time, the seal When the cavity is put into the furnace once to complete the brazing, due to the complex structure of the weld seam, the stress is large, and the braze seam is easy to crack

Method used

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  • Vacuum brazing method suitable for closed cavity multi-welding-seam structure
  • Vacuum brazing method suitable for closed cavity multi-welding-seam structure
  • Vacuum brazing method suitable for closed cavity multi-welding-seam structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0057] Such as Figures 1 to 3 as shown,

[0058] A vacuum brazing method suitable for a closed cavity multi-weld structure, comprising the following steps:

[0059] 1) Control the weld length of part A and part B to be greater than or equal to 3.5mm;

[0060] 2) Control the gap d1 in the upper part of the weld between part A and part B = 30-80 μm, and the gap d2 in the lower part = 5-10 μm, where the length L of the weld in the lower part is 0.5-1.5 mm;

[0061] 3) Put parts A and B in alcohol or acetone, use ultrasonic cleaning for 10±5min, and dry parts A and B with a blower;

[0062] 4) Coating the paste solder through a syringe, and measuring the weight change of solder before and after coating with an electronic scale, recording the amount of solder coated, and controlling the amount of solder to be 0.06-0.1g;

[0063] 5) Use a drying oven to dry at a temperature of 100±20°C for 1h±30min;

[0064] 6) The parts are placed on the material tray of the brazing furnace, a...

Embodiment 1

[0076] Aiming at parts A, B and C made of 0Cr18Ni9 stainless steel, a vacuum brazing method suitable for a closed cavity multi-weld structure comprises the following steps:

[0077] 1) Control the weld length of part A and part B to be 3.5mm;

[0078] 2) Control the upper part of the weld gap between part A and part B to be d1 = 30 μm, and the lower part gap d2 = 5 μm, where the length of the weld in the lower part is L = 0.6 mm;

[0079] 3) Put parts A and B in alcohol or acetone, ultrasonically clean them for 10 minutes, and dry them with a blower;

[0080] 4) Evenly coat the BNi-2 paste solder through a syringe, and use an electronic scale to weigh the weight change of the solder before and after coating, record the amount of solder coated, and control the amount of solder to 0.06g;

[0081] 5) Use a drying oven to dry for 80 minutes at a temperature of 110°C;

[0082] 6) The parts are placed on the material tray of the brazing furnace, and the parts cannot be touched. Th...

Embodiment 2

[0088] Such as Figure 4 As shown, for parts A, B and C of Inconel 625 superalloy material, a vacuum brazing method suitable for closed cavity multi-weld structure, the operation steps are as follows;

[0089] 1) Control the weld length of part A and part B to be 4mm;

[0090] 2) Control the upper part of the weld gap between part A and part B to be d1=50μm, and the lower part gap d2=8μm, where the length of the lower part of the weld is L=1mm;

[0091] 3) Put parts A and B in alcohol or acetone, ultrasonically clean them for 15 minutes, and dry them with a blower;

[0092] 4) Apply the BCo-1 paste solder evenly through the syringe, and use an electronic scale to weigh the weight change of the solder before and after coating, record the amount of solder coated, and control the amount of solder to 0.1g;

[0093] 5) Use a drying oven to dry for 90 minutes at a temperature of 120°C;

[0094] 6) The parts are placed on the material tray of the brazing furnace, and the parts can...

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Abstract

The invention relates to a vacuum brazing method suitable for a closed cavity multi-welding-seam structure. The method comprises the following steps of firstly, welding a part A and a part B, and then welding the part B and a part C to finish the welding of a whole part. According to the method, the welding seam quality is good and stable by tightly closing the gap at the bottoms of welding seams, feeding into a furnace twice and accurately controlling the brazing material amount.

Description

technical field [0001] The invention belongs to the field of metal welding, and in particular relates to a vacuum brazing method suitable for a closed cavity multi-welding seam structure. Background technique [0002] With the continuous development of science and technology, the performance of products is gradually improved, and the requirements for parts are also gradually increased; the structure of many parts needs to achieve the purpose of complex structure design and weight reduction. The complex structure also brings new challenges to the welding technology of parts. against figure 1 Due to the structural characteristics of the parts, welding methods such as fusion welding cannot meet the welding of closed structures. Brazing is the best choice for welding such structures. Direct brazing often leads to uneven weld gaps. When the gap on one side of the weld gap is small, the solder cannot be filled into the weld, resulting in unwelded defects, and the airtight or oil...

Claims

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Application Information

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IPC IPC(8): B23K1/20B23K1/008
CPCB23K1/206B23K1/20B23K1/008
Inventor 孙威威孟虎刘六九王晨李正伟丰雷明
Owner 楼蓝科技(江苏)有限公司
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