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Vacuum Heat Treatment Furnace

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Vacuum Brazing Furnace

Vacuum Furnace Brazing

Brazing technology (Soldering and Brazing) is the earliest method used by humans to connect materials. With the emergence of new materials and new structural forms, brazing technology needs to face higher standard connection requirements. The endless emergence of new methods promotes brazing technology to play a key production advantage in the manufacturing of large generators, greatly improving the performance of large generators. The manufacturing level also lays a solid foundation for the precise production of large-scale generator sets, promoting the rapid development of the quality of large-scale generator sets put into production.

1 Technical principles of vacuum brazing technology

The vacuum brazing welding method has excellent performance and mainly uses metal materials with relatively low melting points of the weldment as filler metal. During the implementation of vacuum brazing technology, the filler metal and the weldment that are lower than the melting point of the weldment can be heated at the same time. This technology does not have strict restrictions on the thickness difference of the weldment. Once the filler metal reaches the melting temperature, it can be used to The liquid phase of the filler metal wets the weldment and fills the solid workpiece joint gap, thereby promoting the mutual diffusion of the welding parts to create a connection and realizing the connection of the welding parts. This technology can weld multiple welding parts and multiple joints at the same time, and the production efficiency is high. In some practical cases, the implementation conditions of brazing technology can be scientifically changed to ensure that the welds of a large number of weldments can be welded simultaneously, but contact with the deep structures of the weldments must be avoided. What needs to be noted during the vacuum brazing process is that once the liquid solder is spread on the surface or gap of the weldment, the solder will interact with the weldment, and the solder will cool and solidify into a strong joint. By fully cleaning the joint, it can effectively It greatly improves the stability of the joint and makes the joint seamlessly pluggable.

1.1 Vacuum brazing application

The furnace vacuum brazing method is more suitable for use in the manufacturing process of motors with larger production volumes and higher production efficiency. The welding parts assembled with solder need to be placed in a vacuum furnace for heating before brazing can be carried out. There is an inevitable close relationship between brazing equipment and brazing processes.

2 Application characteristics of vacuum brazing technology in large generator manufacturing

2.1 Control of solder metal

In brazing, the melting point of the solder must be lower than the welding material. The solder is a combination of two materials or components. A filler is attached to the gap or next to the gap. It is an important weld filler material in the brazing process. It can According to the height of the melting point, solder is divided into soft solder, hard solder, and high-temperature solder. The manufacturing of large generators gradually tends to complex structures and functional designs, and the requirements for brazing are also increasing. Therefore, the performance of the solder material largely determines the performance of the brazing process and the performance of the brazed joint. The material of the solder material must be strictly controlled during the manufacturing process of large generators to reduce the resistance of the fiber material and promote the scientific matching of the solder material and the weldment. A comprehensive consideration should be made based on the brazing heating process and economic cost constraints.

2.2 Design of joints

The design of brazed joints should take into account the structural requirements of large-scale generator manufacturing. During the actual welding operation, the brazing welding goals should be achieved based on the strength control of the welded joints, and the brazed welded joints should be designed scientifically. At the same time, because the manufacturing of large generators has very strict requirements on the accuracy of the components and components of the generator, it is necessary to strictly control the range of brazed joints and welds in the assembly of generator components and parts, in order to This improves brazing to the maximum extent

Excellent welding quality, fully ensuring welding efficiency. In addition, the brazed welding joints need to be screened and selected according to the specific welding process characteristics and the welding processing parts.

2.3 Parameters of vacuum brazing process

Brazing temperature is one of the most important process parameters in the vacuum brazing process. In addition to promoting the melting of the solder and the formation of a joint between the weld seam and the weldment, it can also complete the heat treatment process after brazing to improve the quality of the joint. The main basis for determining the brazing temperature is the specific melting point of the brazing material. For individual brazing methods, when determining the brazing temperature, the parameter standards of the heat treatment process must be fully taken into consideration. Heating speed and cooling speed will also have a certain obvious impact on the quality of welding joints. When brazing is performed while ensuring the heating and cooling speeds, the brazing material characteristics and implementation time must be fully considered to meet the actual temperature needs of different parts in the manufacturing of large generators.