A vacuum brazing furnace joins two or more metal materials together. Using a dissimilar metal filler material, the brazing oven is heated until the filler metal begins to flow. As the component cools, the metal solidifies again and binds the materials together. The filler metal has a lower melting point than the materials being joined.
Vacuum brazing furnaces remove oxygen from the heating chamber to prevent oxidation of the metals during the heating process. Filler metals are then brought up to brazing temperature, filling the space between joints due to capillary action. Removing the oxide layer prevents contamination while the brazing cycle doesn’t cause thermal distortion like other metal joining processes.
A vacuum brazing oven consists of a double-walled heating chamber and a vacuum pump to remove oxygen from the vessel. Parts are loaded and sealed into the chamber and the temperature is raised to the melting point of the filler metal. The parts are then cooled, removed and inspected for quality.
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