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Brazing alloy prefilling process in vacuum brazing

A brazing filler metal and vacuum technology, which is applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve problems such as brazing filler metal falling off, interference fit assembly cannot be implemented, brazing filler metal coating cannot be placed in the position to be brazed in advance, etc. To achieve the effect of preventing the solder from falling off

Active Publication Date: 2011-09-14
XIAN YUANHANG VACUUM BRAZING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only braze visible joints. For hidden, invisible, all-round or lap joints that exceed the unidirectional filling depth of conventional solder (not exceeding 10mm), better joints cannot be completed. Brazing rate
[0003] Moreover, when the structure and assembly accuracy of the parts to be brazed are required to be high or the gap between the parts to be brazed is small, the conventional solder coating cannot be placed in the part to be brazed in advance.
For example, when the assembly radial gap between the hole and the shaft is small (no more than 0.02mm), the pre-set solder (regardless of the form of the solder) will cause the interference fit assembly to be impossible, and the solder coating cannot be pre-placed. The position to be brazed; even if it is forced to be loaded, the accuracy of the shaft and the hole will appear. Regardless of the brazing material coated on the hole or the mating part on the shaft, it is difficult to be uniform and cannot meet the design requirements, or the brazing material will automatically fall off, resulting in vacuum brazing. The process cannot be implemented, and the brazing seam cannot obtain a brazing seam that meets the design requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 brazing filler metal preset technology, comprises the following steps:

[0026] 1) Preparation of solder and guide bar

[0027] Cut the foil-shaped brazing material into 30×60 rectangular pieces, put it into acetone to clean, take it out, blow it dry with hot air, and put it in a clean bag for later use; the brazing material is gold-germanium-nickel-copper system, its The chemical components are 88% Au, 10% Ge, 1.5% Ni, 0.5% Cu, the shape of the solder is foil, and the thickness is 0.1mm;

[0028] Wipe the inner diameter of the hole where the end cylinder of the guide bar to be brazed and the end plate fit with acetone with a silk cloth, and place it in a clean environment to wait for assembly;

[0029] 2) Assembling solder

[0030] Bend the brazing material into a circle, put it on the cylindrical part of the end of the guide bar, cover it with a stainless steel belt with an area larger than the brazing material and a thickness of 0.1, and fasten it with...

Embodiment 2

[0040] Embodiment 2 brazing filler metal preset technology, comprises the following steps:

[0041] 1) Preparation of solder and guide bar

[0042] Cut the foil-shaped solder into 40×80 rectangular pieces, put it in acetone to clean, take it out, dry it with a hot air blower, and put it in a clean bag for use; the solder is gold-germanium-nickel-copper, and its The chemical components are 80% Au, 18% Ge, 1.5% Ni, 0.5% Cu, the shape of the solder is foil, and the thickness is 0.1mm;

[0043] Wipe the inner diameter of the hole where the end cylinder of the guide bar to be brazed and the end plate fit with acetone with a silk cloth, and place it in a clean environment to wait for assembly;

[0044] 2) Assembling solder

[0045] Bend the brazing material into a circle, put it on the cylindrical part of the end of the guide bar, cover it with a stainless steel belt with an area larger than the brazing material and a thickness of 0.1, and fasten it with a stainless steel clamp; ...

Embodiment 3

[0055] Embodiment 3 brazing filler metal preset technology, comprises the following steps:

[0056] 1) Preparation of solder and guide bar

[0057] Cut the foil-shaped solder into 40×80 rectangular pieces, put it in acetone to clean, take it out, dry it with a hot air blower, and put it in a clean bag for use; the solder is gold-germanium-nickel-copper, and its The chemical components are 88% Au, 10.5% Ge, 1% Ni, 0.5% Cu, the shape of the solder is foil, and the thickness is 0.1mm;

[0058] Wipe the inner diameter of the hole where the end cylinder of the guide bar to be brazed and the end plate fit with acetone with a silk cloth, and place it in a clean environment to wait for assembly;

[0059] 2) Assembling solder

[0060] Bend the brazing material into a circle, put it on the cylindrical part of the end of the guide bar, cover it with a stainless steel belt with an area larger than the brazing material and a thickness of 0.1, and fasten it with a stainless steel clamp; ...

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Abstract

The invention discloses a brazing alloy prefilling process in vacuum brazing, which comprises the following steps of: clamping a brazing alloy and a parent stock; casting in vacuum, and making the brazing alloy and the parent stock melted on the premise of keeping the mechanical properties unchanged, wherein the structure of the brazing alloy is not completely disintegrated, and an eutectic liquid phase appears only; and making the condensed brazing alloy and the parent stock subjected to micro metallurgical bond, wherein the bond strength sigma b is 60-120MPa and can ensure that the brazing alloy is not separated from the parent stock during finish machining. The brazing alloy prefilling process solves the problems that capillarity of the brazing alloy is limited within 10mm, the high-strength bond of the brazing alloy and the parent stock ensures that the brazing alloy can be subjected to finish machining and is not peeled, and the brazing alloy prefilling process is particularly suitable for difficulty connected, concealed and high brazed rate brazing.

Description

technical field [0001] The invention belongs to the technical field of brazing, and relates to a solder presetting process in vacuum brazing. Background technique [0002] The conventional brazing material presetting method is to apply paste solder to the position to be brazed, or bond or spot-weld foil solder to the position to be brazed, and then put it into a brazing furnace for automatic brazing. When the solder is placed, use the gravitational action of the solder and the capillary action of the solder gap as much as possible to promote the filling of the solder, and ensure that the flux and gas in the gap have a discharge path when the solder is filled. This method can only braze visible joints. For hidden, invisible, all-round or lap joints that exceed the unidirectional filling depth of conventional solder (not exceeding 10mm), better joints cannot be completed. Brazing rate. [0003] And when the structure and assembly accuracy level of the part to be brazed is re...

Claims

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Application Information

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IPC IPC(8): B23K1/20
Inventor 任耀文任轩任军许英杰
Owner XIAN YUANHANG VACUUM BRAZING TECH
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