What is a vacuum brazing furnace?

Vacuum brazing furnace is a large-scale heat treatment equipment specifically used for metal brazing treatment. The following is a detailed explanation about vacuum brazing furnaces:

1. Definition and characteristics
Vacuum brazing furnace is a specialized equipment for metal brazing in a vacuum environment. It can heat and braze workpieces under high vacuum or specific atmospheric conditions to achieve a strong connection between metals.

2. Main features
Vacuum environment: The vacuum brazing furnace operates under vacuum conditions, which can effectively avoid oxidation or contamination of the workpiece during the heating process, ensuring welding quality.
Temperature control: This device can be programmed with multiple different programs to control and program hundreds of heat treatment curve points, achieving precise temperature control. At the same time, it adopts zone temperature control technology, which is divided into six zones for temperature control: upper, lower, left and right, front and back, to ensure furnace temperature uniformity within ± 3 ℃.
Efficient processing: Vacuum brazing furnaces have the characteristics of large furnace loading and high efficiency, and do not require supplementary process treatment for complex parts and parts with special requirements.
Protection device: equipped with multi-point and single point temperature recorders and over temperature protection devices to ensure safe operation of the equipment.

3. Working principle
The working principle of a vacuum brazing furnace is to apply flux to the welding area of the workpiece that needs to be cleaned and cleaned, and then lay solder (powder, granular, or flake can be used), and then place another component that needs to be welded (the welding surface is also coated with flux). After positioning and fixing the two pieces, they are loaded into the furnace and heated by the heating system to the temperature where the solder melts, allowing the workpiece to be welded.

4. Main structure
The main structure of a vacuum brazing furnace includes the furnace body, heating chamber, vacuum system, air cooling system, inflation system, pressure divider system, water cooling system, electrical control system, etc. Among them, the heating system uses graphite tubes as heating elements, which are evenly distributed along the circumference of the heat zone to provide good furnace temperature uniformity. The vacuum system achieves high vacuum extraction through a combination of mechanical pumps, Roots pumps, and diffusion pumps.

5. Application field
Vacuum brazing furnace is mainly used for vacuum brazing of aluminum products such as aluminum alloy heat exchangers, as well as brazing of stainless steel, titanium alloys, hard alloys, high-temperature alloys, and non-ferrous metals. In addition, it can also be used for vacuum tempering treatment of materials such as high-speed steel, tooling steel, bearing steel, stainless steel, as well as aging and annealing treatment of non-ferrous metals. It is also widely used in the manufacturing process of stainless steel heat exchangers, oil coolers, stainless steel insulation cups, and other products.

In summary, vacuum brazing furnace is a powerful, efficient and reliable metal brazing equipment widely used in multiple fields, providing important support for the connection and treatment of metal materials.