A method of improving brazing welding strength

A welding strength and brazing technology, which is applied in the field of improving brazing welding strength, can solve the problems that the adhesion effect of the welding surface is greatly affected, the brazing material cannot fill the gap of the joint, and the cost of manufacturing and inspection is increased, so as to improve the welding production. Efficiency and quality stability, controllable management, improved wetting and spreading

Active Publication Date: 2015-09-16
SHENYANG AIRCRAFT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, electroplating, chemical plating, hot dipping and pressing are used for treatment. The above methods have many limitations: electroplating and chemical plating cannot be applied to non-metal and metal brazing, especially non-metal and non-metal brazing; hot dipping The adhesion effect of the bonding method and the pressing method on the welding surface is greatly affected by the material and the process method, and the application range is very small
If the brazing gap is too small, it will hinder the inflow of solder, and if the brazing gap is too large, it will destroy the capillary action of the solder. Therefore, no matter whether the brazing gap is large or small, the solder cannot fill the gap of the joint, resulting in weld defects. The generation of the problem causes the strength of the welded joint to decrease and increases the cost of manufacturing and inspection

Method used

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  • A method of improving brazing welding strength
  • A method of improving brazing welding strength
  • A method of improving brazing welding strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1 The welding method of welding 1Cr18Ni9Ti and ceramics

[0015] 1) Preparation of ceramic particles attached to the brazing metal nanopowder used: this example selects as figure 1 For the ceramic particles in the shape shown in b, the particle size of the selected ceramic particles is about 0.8mm, and the nickel-based solder is selected. The operation is as follows: carboxyl groups (-COOH) are introduced on the ceramic surface, which can chemically adsorb Ni 2+ , Ni 2+ After being reduced by the reducing agent, a catalytic active center is formed on the surface of the ceramic substrate, thereby initiating the chemical deposition process, and uniformly dispersed nano-nickel particles are formed on the surface of the ceramic substrate.

[0016] figure 1 Middle b is a ceramic particle with more rounded corners, which is mainly used for the treatment of the surface of the welded body where the interaction between the solder and the base metal is weak or a sma...

Embodiment 2

[0020] Embodiment 2 The welding method of welding 1Cr18Ni9Ti and 0Cr18Ni11Ti

[0021] 1) Preparation of ceramic particles attached to the brazing metal nanopowder used: this example selects as figure 1 For the ceramic particles in the shape shown in a, the particle size of the selected ceramic particles is about 1.5 mm, and the nickel-based solder is selected. The operation is as follows: carboxyl groups (-COOH) are introduced on the ceramic surface, which can chemically adsorb Ni 2+ , Ni 2+ After being reduced by the reducing agent, a catalytic active center is formed on the surface of the ceramic substrate, thereby initiating the chemical deposition process, and uniformly dispersed nano-nickel particles are formed on the surface of the ceramic substrate.

[0022] Such as figure 1 as shown, figure 1 Middle a is a ceramic particle with more edges, which is mainly used for the treatment of the surface of the welded body that has a strong interaction between the brazing fill...

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Abstract

The invention discloses a method for improving brazing strength. According to the technical scheme, the method includes the steps of (1) preparation of ceramic particles for adhering metal nanopowder of used brazing filler metal: selecting appropriate ceramic particles according to actual brazing conditions, and preparing the ceramic particles for adhering the metal nanopowder in the used brazing filler metal; (2) brazed surface treatment: performing degreasing and surface oxide removal on a brazed surface, then enabling impact and friction to be generated between the brazed surface and the ceramic particles adhering the metal nanopowder by a shot blasting or vibration method, enabling the brazed surface to have different roughness heights, and coating a metal layer on the brazed surface; and (3) brazing: combining inert gas shielding and heat preservation processes to complete brazing. By the aid of the spot blasting or vibration method, brazed surface quality and brazing filler metal flowability are improved, evenness, diffusion depth and concentration of the brazing filler metal in the whole brazing area are improved, and further brazing connection strength is improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for improving brazing welding strength. Background technique [0002] With the continuous improvement of welding technology requirements in the field of industrial manufacturing, the manufacture of structures such as dissimilar metals, metals and non-metals, non-metals and non-metals is increasingly relying on brazing technology. In order to achieve good welding results, the brazing surface is plated The metal cladding process becomes very important. Usually, electroplating, chemical plating, hot dipping and pressing are used for treatment. The above methods have many limitations: electroplating and chemical plating cannot be applied to non-metal and metal brazing, especially non-metal and non-metal brazing; hot dipping The adhesion effect of the bonding method and the pressing method on the welding surface is greatly affected by the material and the proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/19B23K1/20
Inventor 景智许学军王鹏
Owner SHENYANG AIRCRAFT CORP
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