How is brazing welded?

Brazing is generally a welding process, in which the solder is melted by the flame and penetrates into the gaps between the workpieces to make them firmly attached.

Brazing is a method of connecting weldments by using a metal material with a melting point lower than that of the base metal as the brazing filler metal, heating the weldments and the brazing filler metal to a temperature higher than the melting point of the brazing filler metal and lower than the melting temperature of the base metal, wetting the base metal with liquid brazing filler metal, filling the joint gap, and diffusing with the base metal.

The brazing deformation is small, and the joint is smooth and beautiful. It is suitable for welding parts made of precise, complex and different materials, such as honeycomb structural plates, turbine blades, cemented carbide tools and printed circuit boards. Before brazing, the workpiece must be carefully processed and strictly cleaned to remove oil stains and excessive oxide films and ensure the assembly clearance of the interface. Clearance is usually required to be between 0.0 1 and 0. 1 mm. ..

Extended data:

Characteristics of brazing:

1, the surface of the joint is smooth, the air tightness is good, the shape and size are stable, the structure and performance of the weldment have little change, and the same or different metals and some nonmetals can be connected. During brazing, the whole workpiece can be heated, and multiple welds can be welded at one time, which improves the productivity. However, the strength of brazed joints is low, so lap joints are often used to improve the strength of joints by increasing the lap length; In addition, the preparation work before brazing is more demanding.

2. The solder melts, but the weldment does not melt. In order to make the brazing part firmly connected and enhance the adhesion of solder, solder should be used to remove oxides on the surfaces of solder and weldment.

3. Hard solder, with high strength, can be used to connect parts that bear loads, and is widely used, such as cemented carbide tools and bicycle frames. Soft solder, with low welding strength, is mainly used for welding weldments that do not bear load but require good sealing, such as containers and instrument components.

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