brazing process

What Is The Vacuum Brazing Process?

Brazing refers to a welding method in which a filler material with a melting point lower than that of the workpieces, and the workpieces themselves, are heated simultaneously to the melting temperature of the filler material. This method involves using the liquid solder to fill the gaps in the solid workpieces, thus creating a metallic connection. During soldering, it is essential to first remove any oxide layers and oil residues from the contact surfaces of the base materials. This facilitates the capillary action of the solder once it melts, enhancing the solder’s wetting and capillary flow properties.

Brazing Process

The workpieces, which have been cleaned on the surfaces, are assembled in a lap joint configuration, and the solder is placed near or between the joint gaps. When the workpieces and the solder are heated to slightly above the solder’s melting point temperature (the workpieces remain unmelted), the solder melts and, aided by capillary action, is drawn into and fills the gaps between the solid workpieces. The liquid solder and the workpiece metals mutually diffuse and dissolve into each other, forming the brazed joint upon cooling.

Advantages of Brazing Process

1. The brazing process can reach temperatures of 500-700 degrees, and the strength of the aluminum sheet increases after cooling following the brazing process.

2. A continuous tunnel-type brazing furnace can accommodate the welding of large components, with typical cold plate dimensions for 52 battery cells reaching 120*85.

3. Brazing can join different types of aluminum sheets, such as pure aluminum and aluminum alloy sheets, with a high-strength brazed layer.

4. Brazing can join thin and thick plates without producing weld seam protrusions.

Disadvantages of Brazing Process

1. Brazing furnaces have large volumes and consume significant energy.

2. Brazing requires the use of flux, which may lead to environmental pollution.

3. Brazing demands higher process requirements, necessitating skilled expertise and experience; improper handling can lead to defects such as porosity and cracks.

4. Brazing is relatively costly, as it requires the purchase of flux and brazing equipment.

Vacuum Brazed Liquid Cooling Plate

Vacuum brazing is a manufacturing process used to join components for higher thermal performance and lighter solutions. A vacuum brazed liquid cooling plate refers to a type of water-cooled plate that is fabricated by processing two metal plates with internal channels and fin structures (typically folded or scraped fins) and then carefully sealing them within a vacuum chamber for heating. The lower-melting-point filler metal melts into the joints of the cooling plate through capillary action under the appropriate process conditions, connecting the two plates with internal channels and fin structures to form internal flow passages. A vacuum system can be connected to the workpiece to maintain a pressure lower than atmospheric pressure inside the workpiece during vacuum brazing.

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