Preparation method of fluxed core welding ring

Abstract

The invention relates to a preparation method of a fluxed core welding ring. The preparation method comprises the following steps: preparing a thin strip 0.1-0.5mm think from a silver brazing material containing 20-45% of silver, carrying out annealing treatment on the thin strip, washing the thin strip subjected to annealing treatment, curling the thin strip by using a roller so as to deform to form a U-shaped strip with an upward opening, vibrating a silver brazing agent to a conveying belt from a hopper, then conveying the silver brazing agent to the U-shaped strip through the conveying belt, rolling the U-shaped strip by the roller so as to deform to form a butted tubular structure, flattening the tubular structure by rolling to form a flat welding wire with a butted seam, cleaning the flat welding wire with a brush wheel and a hairbrush, and heating the flat welding wire through a low temperature resistor and then carrying out looping forming. The active temperature of the silver brazing agent is 550-850 DEG C; the sliver brazing agent is formed by mixing the following components in percentage by weight of the total weight of the silver brazing agent: 35-37% of boric anhydride, 21-23% of potassium fluoborate and 41-43% of fluoride; the silver brazing agent accounts for 10-25% of the total weight of the fluxed core welding ring. The preparation method disclosed by the invention is concise and reasonable, the brazing process is simplified, the quality of a brazed joint is improved and the use cost of the brazing agent can be effectively reduced.

Description

technical field [0001] The invention relates to a preparation method of a flux-cored welding ring and a flux-cored welding ring, in particular to a flux-cored welding ring with a silver content of 20-45% and a preparation method thereof, and the flux-cored welding ring is especially suitable for high-frequency Used in brazing and flame brazing equipment, it can be widely used in brazing in refrigeration, machinery and other industries. It belongs to a new type of brazing ring. Background technique [0002] Compared with brass solder, silver solder has a relatively lower brazing temperature, and at the same time, its mechanical properties are better than brass solder, it has good electrical conductivity, and the service life of brazed joints is longer. It is the most widely used type Brazing filler metal. [0003] Generally, silver solder containing 20~45% silver can be used for the connection of copper and steel dissimilar metals. It has excellent performance after welding,...

AI Technical Summary

Problems solved by technology

[0004] Although there are already flux-cored silver solders in the market, due to the poor deep processing performance of some silver solders, the processing difficulty is further increased after being prepared into flux cores.

Based on the above reasons, there is no flux-cored silver solder ring with a silver content of 20-45% in the market, which affects the popularization and application of silver-containing solder with a silver content of 20-45%

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