Brazing is a crucial process in various industries, and understanding the different heat sources used can help you choose the best method for your needs.
3 Key Methods Explained
1. Furnace Brazing
Furnace brazing involves joining metallic materials using a molten filler metal.
The parts are placed in a furnace where the filler metal is heated to its melting point.
This method is ideal for mass production because it can handle large volumes of parts simultaneously.
The furnace can operate under various atmospheres, including exothermic, hydrogen, argon, and vacuum.
2. Induction Brazing
Induction brazing uses electromagnetic induction to heat the filler metal.
An alternating current is passed through a coil, generating a magnetic field.
When the parts to be brazed are placed within this field, eddy currents are induced, causing them to heat up.
This method is highly efficient and repeatable, making it suitable for high production runs.
Induction brazing is versatile and can be used in various applications, such as brazing carbide to a shaft or sealing containers in the food and pharmaceutical industries.
3. Inert Gas Brazing
Inert gas brazing involves brazing in an environment filled with an inert gas like nitrogen, helium, or argon.
The inert gas helps prevent oxidation of the materials being brazed by displacing oxygen in the surrounding atmosphere.
Before brazing, the workpiece is typically evacuated and then flushed with the inert gas to remove any remaining water molecules.
This method is particularly useful when using flux for brazing, as the inert gas provides a protective atmosphere that enhances the integrity of the braze joint.
The inert gas must have a dew point of less than 51 ℃ to be effective.
Each of these methods offers unique advantages and is chosen based on factors such as the type of materials being joined, the geometry of the joint, and the production volume required.
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