Silver-based braze welding material and preparing method of silver-based braze welding material

Abstract

The invention discloses a silver-based braze welding material and a preparing method of the silver-based braze welding material, and solves the problems that the surface and the inside of a braze material ingot still have defects such as air pores and slag inclusions, so the braze material quality is unstable. The silver-based braze welding material comprises the following ingredients in percentage by weight: 29.0 to 57 percent of Ag, 10.0 to 46.0 percent of Cu, 10.0 to 36.0 percent of Zn, 0 to 2.5 percent of Ni and 0 to 25.0 percent of Cd. The preparing method comprises the following steps that (1) the silver-based braze welding material is prepared into a braze material according to a certain ingredient proportion to be added into a crucible; (2) the braze material is heated to 825 to 925 DEG C under the protection of Ar protection gas and is in a fused state; (3) the braze material in the fused state is uniformly stirred; (4) the braze material stops heating and is slowly cooled, and through consolidation forming, the braze material ingot is obtained; (5) the braze material ingot is poured out from the crucible. The silver-based braze welding material and the preparing method of the silver-based braze welding material have the advantages that in the smelting process, no burning loss exists, the ingredients are stable, the surface and the inside of the obtained braze material ingot cannot generate defects such as air pores and slag inclusions, and the quality of the braze material is stable.

Description

technical field [0001] The invention relates to a silver-based brazing material and a preparation method thereof. Background technique [0002] Silver-based brazing is a type of brazing process. During brazing, the weldment is connected by the solidification of the molten solder to connect the two welded pieces. During flame brazing, the flux is pre-coated on the surface of the interface or the brazing material is heated first, dipped in flux, and then uniformly heated to the surface to be welded to the brazing temperature. The brazing filler metal flows evenly to fill the gap to achieve the purpose of welding. [0003] Silver-based brazing materials are usually alloys based on silver or silver-based solid solutions. This kind of material has excellent process performance, low melting point, good wetting performance and joint filling performance, excellent strength, plasticity, electrical conductivity, corrosion resistance and other properties, and can be used for brazing...

AI Technical Summary

Problems solved by technology

[0006] It can be seen from Table 1 that the less the smelting, the greater the burning loss. Then, the surface and interior of the extruded ingot were randomly inspected by radiography, and it was found that the surface and interior of the extruded ingot still often had defects such as pores and slag inclusions. Make the solder quality unstable, so it is necessary to improve the above problems