The function of brazing is to join two or more metal or ceramic components together using a filler material with a lower melting point than the workpiece materials. The brazing process involves melting the filler material and allowing it to flow into the gaps between the parts to be joined through capillary action. Once cooled, the filler material solidifies, forming a strong and sealed joint.
The function of brazing can be summarized into the following steps:
1. Checking the fit of the joint: It is important to ensure that the gap between the metal pieces is neither too wide nor too narrow, as this can weaken the bond between them.
2. Cleaning the metal surfaces: Before brazing, the metal surfaces need to be cleaned to remove any contaminants such as grease, oil, rust, and scale. These contaminants can weaken or prevent the formation of a bond between the workpieces.
3. Assembling the parts: The components to be brazed must be precisely aligned and held in proper position throughout the brazing process. Clamps or support fixtures can be used to ensure proper alignment.
4. Brazing the assembly: The assembly is heated in a furnace, causing the filler material to melt and flow between the metal pieces. The temperature used is above the melting point of the filler material but below the solidus temperature of the parent materials. This allows the filler material to form a strong joint without melting the base metal.
5. Cleaning the finished assembly: After brazing, the finished assembly may need to be cleaned to remove any residues or contaminants from the brazing process.
The function of furnace brazing, a specific type of brazing, is to join metal pieces together using heat and a dissimilar metal filler material. Furnace brazing offers several advantages over other metal-joining methods, such as controlled heat levels, increased production, and the ability to join large batches of components. Different types of furnaces, such as vacuum, continuous, controlled atmosphere, or reduced atmosphere furnaces, can be used for furnace brazing depending on the specifications of the part and project.
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