What is brazing technology
Brazing technology is a method of filling the joint gap with a wetted liquid filler and heating the joint gap by using the base metal as the filler and heating it to a temperature above but below the melting point. The melting point of base metals.
Classification of brazing methods
The quality of brazing joint depends on brazing method, brazing material (flux, filler metal, etc.) and process parameters. According to different characteristics and standards, brazing methods have the following classification methods.
1. According to the melting point of solder, it can be divided into soft brazing and hard brazing. When the melting point of solder is below 450 ℃, it is called soft soldering, when it is higher than 450 ℃, it is called the brazing.
2. According to the brazing temperature, it can be divided into high temperature brazing, medium temperature brazing and low temperature brazing. The temperature is separated from the melting point of the base metal. For steel, for example, when the heating temperature higher than 800 ℃ is called high temperature brazing, when the heating temperature between 550 and 800 ℃ is called the brazing temperature, when heating at low temperature is called low temperature brazing. For aluminum alloy, called when heating temperature higher than 450 ℃ high temperature brazing, when the heating temperature between 300 ℃ to 450 ℃ when called in brazing temperature, when the heating temperature of 300 ℃ is called low temperature brazing. Below 300 ℃. Low temperature brazing.
3. According to the heat source type and heating mode, it can be divided into flame brazing, furnace brazing, induction brazing, resistance brazing, dip brazing, gas phase brazing, soldering brazing and ultrasonic brazing.
4. According to the methods of removing oxide film on the metal surface of the matrix, it can be divided into flux brazing, flux free brazing, self-melting brazing, gas shielded brazing and vacuum brazing.
5. According to the characteristics of joint formation, it can be divided into capillary brazing and non-capillary brazing. The situation in which liquid solder is filled into the brazing seam by capillary action is called capillary brazing, and the situation in which capillary action plays a major role in the formation of brazing joint is called non-capillary brazing. Contact reactive brazing and diffusion brazing are the most typical non - capillary brazing processes.
According to different metals or filler metals, it can be divided into aluminum brazing, stainless steel brazing, titanium alloy brazing, high temperature alloy brazing, ceramic brazing, composite brazing, silver brazing, copper brazing and so on.