A method of improving brazing welding strength

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...

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

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