High-strength and high-toughness composite silver solder ring for in-situ synthesis of soldering flux

Abstract

The invention discloses a high-strength and high-toughness composite silver solder ring for in-situ synthesis of soldering flux. The high-strength and high-toughness composite silver solder ring comprises a silver solder ring body of a hollow structure. The silver solder ring body is formed by winding composite silver solder formed by a silver solder pipe and a flux core with which the silver solder pipe is filled. The flux core is prepared from boron micro-powder, sodium borohydride or potassium borohydride, potassium fluoborate, boric anhydride or boric acid, potassium fluoride or sodium fluoride or lithium fluoride, potassium bifluoride and potassium fluoroaluminate according to a certain proportion. The purpose of in-situ synthesis of the soldering flux through the boron micro-powder in the flux core and metal elements in the silver solder pipe is achieved, so that the content of the flux core is reduced, and when the content of the flux core is low, the solder still achieves good brazing manufacturability; meanwhile, due to the fact that the wall thickness of the solder pipe is increased, good toughness and high stiffness are achieved, the processing performance of the solder is greatly improved, the minimum diameter can be reduced to 0.8 mm, the solder can be easily wound into the solder ring with the intermediate diameter below 6 mm, and application and popularization of the automatic brazing process are facilitated.

Description

technical field

[0001] The invention relates to welding materials, in particular to a high-strength and tough composite silver brazing filler metal ring for in-situ synthesis of flux. Background technique

[0002] Silver solder has a moderate melting point, good welding processability, good strength, toughness, electrical conductivity, thermal conductivity and corrosion resistance, and is the most widely used type of hard solder.

[0003] With the development of high-frequency induction welding machines, the application of induction brazing technology in pipeline connection has been developed by leaps and bounds. Induction brazing is easy to operate, heats relatively uniformly, is economical, and does not require heating the entire part. Induction heating allows rapid localized heating to join high-strength components with minimal loss of strength. In order to save solder and produce uniform joints and control the amount of solder used, ring-shaped solder is used more and m...