Vacuum brazing furnace is a kind of advanced welding equipment, whose main feature is welding in a vacuum environment. This method of brazing is achieved by using a metallic material with a lower melting point than the base material as the brazing material, and by using the liquid brazing material to wet the base material and fill the gap between the workpiece interfaces so that it diffuses into the base material. This method is particularly suitable for products requiring high quality and the welding of easily oxidised materials.

Selection of vacuum brazing furnace manufacturers

Choosing the right vacuum brazing furnace manufacturer is crucial for welding quality and productivity. A good vacuum brazing furnace manufacturer should have advanced technology and rich experience, and be able to provide customised solutions to meet various needs. These manufacturers usually provide one-stop services from design, manufacturing to maintenance according to customers' specific needs, ensuring that customers can get the best welding results.

Vacuum brazing steps

The brazing process in a vacuum brazing furnace typically consists of the following key steps.

1.Cleaning the workpiece:Before welding, the workpiece needs to be carefully processed and rigorously cleaned to remove oil and excessive oxide film to ensure that the interface assembly gap. The gap is generally required to be between 0.01 ~ 0.1 mm to ensure that the brazing material can be evenly distributed and fully wet the base material.

2.Apply solder: apply brazing material to the interface of the workpiece. The coating process needs to be uniform and appropriate amount to ensure that the brazing material can completely cover the interface area, while avoiding excessive brazing material leading to unnecessary waste or affecting the welding quality.

3.Preheat the workpiece: Preheat the workpiece in the vacuum brazing furnace. Preheating not only improves the fluidity of the brazing material, but also reduces the stress concentration during the welding process, thus improving the welding strength and reliability.

4.Vacuum treatment:Close the vacuum cover and start the vacuum treatment, so that the pressure inside the workpiece is lower than atmospheric pressure. This process can effectively exclude oxygen and other impurities in the air to prevent oxidation of the workpiece at high temperatures, thus ensuring the quality of the weld.

5.Heating welding:Heating the workpiece in a vacuum environment, so that the brazing material melts and wets the base material to complete the welding process. The control of heating temperature and time is the key factor, which needs to be precisely adjusted according to different materials and process requirements.

Precautions

The following points should be noted during the welding process.

1.Ensure vacuum environment:Maintain a vacuum environment during the welding process to avoid oxidation. Any entry of outside air will affect the welding quality, so it must be ensured that the whole welding process is carried out under strict vacuum conditions.

2.Control temperature and time:Reasonably control the heating temperature and time to ensure that the brazing material fully wets the base material and completes the diffusion. Too high a temperature or too long a time can lead to a deterioration in material properties, while too low a temperature or too short a time can lead to an inadequate weld.

3.Check workpiece cleanliness:Ensure that the surface of the workpiece is clean and free of oil and oxide film to ensure a quality weld. Any residual impurities will affect the wettability and diffusivity of the brazing material, thus reducing the strength and reliability of the weld.

4.In short, the welding method of vacuum brazing furnace has the characteristics of high efficiency, high quality and environmental protection, and is widely used in aerospace, automobile manufacturing, electronics industry and other fields. By following the positive can give full play to the advantages of vacuum brazing furnace, to achieve high-quality welding results.