Knowledge What is an example of brazing? (5 Steps Explained)
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Tech Team · Kintek Solution

Updated 2 months ago

What is an example of brazing? (5 Steps Explained)

Brazing is a process used to join two or more metal components by melting a filler material between them.

The base materials do not melt during this process.

What is an example of brazing? (5 Steps Explained)

What is an example of brazing? (5 Steps Explained)

1. Selection of Materials

In this example, the materials to be brazed are thin aluminum sheets that form the webs between the tubes of an automotive radiator.

The filler material, a copper/silver alloy, is chosen because it has a lower melting point than aluminum, which is crucial for the brazing process.

2. Preparation of Joints

The aluminum sheets and tubes are thoroughly cleaned to remove any oxide layer or contaminants.

This is essential for ensuring that the filler material can wet the surfaces effectively.

Since aluminum oxide is difficult to remove, a flux is used to assist in the removal of the oxide layer during the brazing process.

3. Application of Filler Material

Instead of placing the brazing alloy directly into each joint, it is roll-bonded onto the thin aluminum sheet.

This method ensures that the brazing alloy is present at every joint where it is needed.

The use of a roll-bonding technique simplifies the process and ensures uniform distribution of the filler material.

4. Brazing Process

The assembly is placed in a mesh belt furnace.

A dry nitrogen atmosphere is used to protect the flux from oxygen and water vapor, which could otherwise interfere with the brazing process.

The furnace is heated to a temperature above the melting point of the copper/silver alloy but below the melting point of aluminum.

This allows the filler material to melt and flow into the gaps between the aluminum components by capillary action.

5. Cooling and Final Assembly

After the filler material has melted and flowed into the joints, the assembly is allowed to cool.

As the filler material solidifies, it forms a strong bond between the aluminum components.

The final product is a heat exchanger core that is integral for the efficient functioning of automotive radiators and air conditioners.

This example demonstrates the versatility and effectiveness of brazing in manufacturing critical components where the strength and integrity of the joint are paramount.

The use of specific atmospheres and fluxes, along with careful temperature control, ensures that the brazing process achieves the desired results in terms of joint strength and reliability.

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