1. Brazing is to use metal material with lower melting point than the base metal as filler metal, heat the welding parts and filler metal to higher than the melting point of the filler metal, lower than the melting temperature of the base metal, use liquid filler metal to wet the base metal, fill the joint gap and mutually diffuse with the base metal to realize the connection of the welding parts.Brazing is divided into soft brazing, hard brazing and diffusion welding.
2, brazing is a kind of brazing, is a kind of hard brazing.Refers to the use of copper, copper base as a filler metal for brazing.In addition to the characteristics of brazing, it also has the advantages of high joint strength.
Brazing is not suitable for welding of general steel structure and heavy load and dynamic load machine parts.It is mainly used for manufacturing precision instruments, electrical parts, dissimilar metal components and complex sheet structure, such as sandwich components, honeycomb structure, etc. It is also commonly used for brazing all kinds of different wire and carbide cutting tools.
Brazing has been widely used in machinery, motor, instrument, radio and other departments.Carbide cutting tools, drilling bits, bicycle frames, heat exchangers, conduits and all kinds of containers;Brazing is even the only possible connection method in the manufacture of microwave waveguides, electron tubes and electronic vacuum devices.
Brazing generally refers to brazing.
Brazing is a high-temperature brazing process.Most brazing temperatures are between 1200 and 1400F° (much higher than that of soft brazing, but much lower than that of fusion).Like soft brazing, brazing relies on capillarity to fill joints with filler metal.There are many different types of brazing alloys that can be used to weld almost any kind of metal or metal alloy.
The AWS classifies solders into several types based on the type of metal element they contain.For example, BCu stands for brazing copper, and BAISi for aluminum-silicon brazing.Different technical parameters are sometimes given for each brazing metal to describe the composition and content of each brazing metal alloy.The mass fraction of the alloy component is indicated as a number or letter at the end of its class name, such as 4 in BAG-4.The type of solder alloy used depends on the base metal being welded.The choice of flux depends on the solder alloy. It is necessary to make the flux and solder alloy match each other to obtain a good welding effect.