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Vacuum Brazing Furnace

Fixture Selection in Vacuum Brazing Furnace

Vacuum brazing can obtain precise and bright joints, and the joints have excellent mechanical properties and corrosion resistance. Compared with other brazing methods, it has obvious advantages in the control of parts oxidation and parts deformation. Devices, water-cooled cold plates, and boxes and boxes with special requirements are all very suitable. High-precision parts can be obtained directly, and the quality is easy to control. Now vacuum aluminum brazing is widely used in electronic product cooling systems.

Advantages of Vacuum Brazing

1.Vacuum brazing is carried out in a vacuum atmosphere, which significantly improves the corrosion resistance of the product, avoids various pollution, pollution-free processing equipment costs, and has good safety production conditions.

2.Vacuum brazing can save a large amount of expensive metal flux, and does not require complicated flux cleaning procedures, which reduces production costs.

3.Vacuum brazing solder has good wettability and fluidity, and can weld more complex and narrow-channel devices. Vacuum brazing improves the yield of products and obtains a strong and clean working surface.

4.Compared with other methods, the internal structure and fixtures of the furnace have a long service life, which can reduce the maintenance cost of the furnace.

5.There are many materials suitable for vacuum brazing, such as: aluminum, aluminum alloy, copper, copper alloy, stainless steel, alloy steel, low carbon steel, titanium, nickel, Inconel, etc. can be brazed in a vacuum electric furnace For welding, the designer determines the required material according to the use of the brazing device, among which aluminum and aluminum alloys are the most widely used.

The main process of vacuum brazing includes: parts processing, pre-brazing treatment, parts assembly and fixing, brazing, post-brazing treatment and quality inspection, etc., each process will affect the final brazing quality. The following discusses the design and selection of fixtures used in vacuum aluminum brazing furnaces.

Brazing Fixtures and General Design Principles

When brazing, the brazing parts should be assembled and positioned to ensure the mutual position between the parts and the joint gap required for brazing. The brazing jig involves the whole process of fixing, assembling, entering the furnace, brazing, and releasing the brazing parts. Whether the jig is reasonable and practical directly affects the brazing quality.

The principles and requirements of ordinary fixture design are also applicable to the design of brazing fixtures. For example, the fixture system must have a certain precision; the fixture system must have a certain rigidity to overcome the deformation during processing; the fixture system must have a compact structure, simple shape, Easy loading and unloading features.

In addition to the above principles, the brazing fixture has its own characteristics. Generally speaking, the following factors should be considered in the design of the brazing fixture: (1) The fixture material should be able to withstand the brazing temperature without losing strength, deformation and Release gas, and it is not easy to produce alloy reaction with the assembly weldment; (2) Pay attention to the temperature expansion and contraction of the fixture and parts. At the brazing temperature, it is necessary to ensure that the brazed parts have a suitable joint gap; (3) The fixture must ensure brazing The heat conduction in the zone, the resulting heat transfer has the least interference with the stable heating and cooling of the parts, and does not hinder the flow of the solder.

The factors to be considered in the design of the vacuum brazing fixture in the furnace are more complicated. Under the condition of ensuring the above requirements, the influence of gravity must also be considered. After the weldment is heated, the joint will relax due to expansion, and the solder will naturally flow downward. Therefore, attention must be paid to the clamping and placement of fixtures and weldments. The fixture structure should be as simple as possible. Brazing is a closed process, and the specific process is invisible. The simpler the fixture, the fewer unforeseen problems, so the fixture has high reliability and strong operability.

In addition to using the correct fixture and technical process, the quality of the brazing furnace selected in vacuum brazing is also a crucial factor. The RHVB vacuum high-temperature brazing furnace produced by SIMUWU has the advantages of good temperature control accuracy and high heating uniformity, and is an excellent product for handling high-temperature brazing processes. Under the premise of selecting appropriate process parameters, high-quality vacuum brazing can be realized.