Brazing alloy prefilling process in vacuum brazing

A brazing material and brazing technology, which is applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of solder falling off, interference fit assembly cannot be implemented, and it is difficult to be uniform, so as to prevent the solder from falling off.

Active Publication Date: 2012-12-19
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 The solder presetting process includes the following steps:

[0026] 1) Preparation of solder and guide bar

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

[0028] Wipe clean the inner diameter of the hole between the end cylinder of the bar to be drilled and the end plate with silk cloth dipped in acetone, and place it in a clean environment for assembly;

[0029] 2) Assembly solder

[0030] The brazing filler metal is bent into a circle, and it is sleeved on the cylindrical part of the end of the guide bar, covered with a stainless steel strip with an area larger than the brazing filler metal and a thickness of 0.1, and tied tightly with a stainless s...

Embodiment 2

[0040] Embodiment 2 The solder presetting process includes the following steps:

[0041] 1) Preparation of solder and guide bar

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

[0043] Wipe clean the inner diameter of the hole between the end cylinder of the bar to be drilled and the end plate with silk cloth dipped in acetone, and place it in a clean environment for assembly;

[0044] 2) Assembly solder

[0045] The brazing filler metal is bent into a circle, and it is sleeved on the cylindrical part of the end of the guide bar, covered with a stainless steel strip with an area larger than the brazing filler metal and a thickness of 0.1, and tied tightly with a stainless steel clamp; P...

Embodiment 3

[0055] Embodiment 3 The solder presetting process includes the following steps:

[0056] 1) Preparation of solder and guide bar

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

[0058] Wipe clean the inner diameter of the hole between the end cylinder of the bar to be drilled and the end plate with silk cloth dipped in acetone, and place it in a clean environment for assembly;

[0059] 2) Assembly solder

[0060] The brazing filler metal is bent into a circle, and it is sleeved on the cylindrical part of the end of the guide bar, covered with a stainless steel strip with an area larger than the brazing filler metal and a thickness of 0.1, and tied tightly with a stainless steel clamp; P...

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PUM

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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 presetting process of brazing material in vacuum brazing. Background technique [0002] The conventional solder presetting method is to inject the paste-like solder to the position to be soldered, or to bond or spot weld the foil-like solder to the position to be soldered, and then load it into the brazing furnace for automatic brazing. When the solder is placed, the gravity effect of the solder and the capillary action of the solder gap are used as much as possible to promote the solder joint filling, and to ensure that the solder and gas in the gap are exhausted when the solder joint is filled. This method can only braze visible joints. For hidden, invisible, omni-directional, or overlapping lengths that exceed the unidirectional filling depth of the conventional solder (not more than 10mm), it will not be able to complete better joints. Brazing rate. [0003] Moreover, when the str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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