1.Introduction

Vacuum brazing is a special form of welding technology that is performed in a vacuum environment to ensure that it is not oxidized during the welding process. This technique is often used to connect metal parts, especially where cleanliness is required. Vacuum brazing furnace, as the key equipment to realize this process, plays a vital role in modern manufacturing industry.

2.Introduction of vacuum brazing furnace

Vacuum brazing furnace is a heating equipment specially designed for the implementation of vacuum brazing process. The working principle is to create a high vacuum environment in a sealed chamber, and then uniformly heat the workpiece by means of resistance heating or induction heating, so that it reaches the solder melting temperature, thus completing the welding process. Compared to traditional welding methods, vacuum brazing furnaces provide more precise temperature control, effectively avoiding material oxidation problems, and significantly improving welding quality.

3.the working principle of vacuum brazing furnace

Preheating stage: First put the parts to be welded into the vacuum brazing furnace, close the furnace door and start the vacuum system to reduce the pressure in the furnace to the required level.

Heating stage: The workpiece is heated through an electric heating element or induction coil until the desired temperature of the drill is reached

Holding stage: Maintain a constant high temperature for a period of time to ensure that the filler metal is completely melted and fully combined with the base metal.

Cooling stage: After the heating is stopped, the workpiece temperature is reduced to room temperature by inert gas or natural cooling.

4.Detailed explanation of process flow
Preparation stage: Select the appropriate filler metal, and clean the surface of the workpiece to remove oil and oxide layer.

Loading stage: The cleaned workpiece is placed in the special fixture according to the designed layout and placed in the designated position in the vacuum brazing furnace.

Vacuuming stage: start the vacuum pump and pump out the air in the furnace until it reaches the set vacuum value.

Heating stage: According to the material characteristics and the type of filler metal to set the appropriate heating curve, through electric heating or induction heating to gradually heat up the workpiece.

Insulation stage: When the temperature reaches the melting point of the filler metal, the constant temperature state is maintained to ensure full diffusion and wetting time.

Cooling stage: turn off the heating power supply, open the cooling procedure, use ammonia or other protective gases to quickly cool down and prevent workpiece deformation.

5. Application Scenarios

Vacuum brazing furnace is widely used in aerospace, automobile manufacturing, electronic component assembly and other fields, especially suitable for complex structural parts and dissimilar materials connection. For example, in the assembly process of aircraft engine blades, high-precision vacuum brazing technology is required to ensure the formation of a strong and reliable joint between the components.

6.Conclusion
In summary, vacuum brazing furnace, as an efficient, environmentally friendly and widely applicable welding equipment, plays an irreplaceable role in modern industrial production. Through a deep understanding of the vacuum brazing process and principles, we can make more effective use of this advanced technology to provide more high-quality products and services for various industries.