The process flow of aluminum vacuum brazing usually includes the following steps:
1. Cleaning: Clean the aluminum joints to be brazed to remove dirt and oxides on the surface.
2. Flux application: Apply flux to the surface of the joint after cleaning. The flux can improve the wettability of the brazed joint and promote the melting and filling of the flux.
3. Assembly: Assemble the fluxed joints together, ensuring proper clearance between joints.
4. Vacuum treatment: put the assembled joint into a vacuum furnace, evacuate and maintain a certain vacuum degree, usually 10^-3~10^-5Pa.
5. Heating: The joint is heated in a vacuum environment to melt the flux and fill the joint gap.
6. Cooling: After heating for a certain period of time, stop heating and keep the vacuum state, so that the joint is gradually cooled and solidified.
7. Cleaning: Take the cooled joint out of the vacuum furnace, clean and remove excess flux and oxides.
Aluminum vacuum brazing has the following advantages:
1. High-quality welded joints: Brazing in a vacuum environment can eliminate problems such as oxidation and pollution, and ensure the quality of welded joints. Brazing in a vacuum environment can reduce the influence of the atmosphere on the joints and avoid the negative impact of impurities in the gas on the welded joints, so that high-quality and reliable welded joints can be obtained.
2. Low-temperature brazing: Aluminum has a low melting point, so low-temperature brazing is generally used. Low-temperature brazing in a vacuum environment can avoid the evaporation and oxidation of aluminum at high temperature, reduce the thermal impact on aluminum, and prolong the service life of the material.
3. Uniformity of the joint: Brazing in a vacuum environment can make the flux fully wet the surface of the joint and distribute evenly in the gap. This ensures that the flux adequately fills the gaps in the joint, creating a strong connection and increasing the strength and stability of the joint.
1. High strength and reliability: Aluminum vacuum brazing can form a firm welded joint with high strength and reliability. Brazing in a vacuum environment can ensure that the flux fully fills the joint gap, making the joint uniform and filled with solder, thereby enhancing the strength and reliability of the welded joint.
2. Low temperature brazing: Aluminum has a low melting point and can be brazed at low temperature. Low-temperature brazing in a vacuum environment can reduce the thermal impact on aluminum and avoid material deformation and performance damage. At the same time, low-temperature brazing can also reduce energy consumption and working hours, and improve production efficiency.
3. Good surface quality: Aluminum vacuum brazing can avoid oxidation and pollution problems and ensure the surface quality of welded joints. Brazing in a vacuum environment can eliminate impurities in the atmosphere, keep the surface of the joint clean, and reduce the possibility of surface oxidation. As a result, vacuum brazing of aluminum produces smooth, flawless welded joints.
4. Applicable to various aluminum alloys: Aluminum vacuum brazing is applicable to various aluminum alloy materials, including pure aluminum and various aluminum alloys. Aluminum alloy has the characteristics of light weight, high strength, and corrosion resistance, and is widely used in aviation, aerospace, automobile, electronics and other fields. Aluminum vacuum brazing can realize the connection of different aluminum alloy materials to meet various application requirements
