How Is the Quality of Brazed Plate Heat Exchangers Guaranteed?

Vacuum brazing technology was applied late in China and has made great progress in the use and development of vacuum brazing technology since the seventies. With the development of modern aviation, aerospace, and electronics industries, as well as the continuous emergence and application of many new high-temperature alloys, vacuum brazing technology with its unique advantages is bound to gain wider and wider application in the industrial field. The brazed plate heat exchanger in China is a new and special pressure vessel, its design, and manufacturing are in accordance with the United States, Japan, and other industrially developed countries, there are mandatory licensing requirements. In order to converge with the international market, China is also actively doing this work.

Here is the content list:

• Brazing process

• Quality Inspection Control

• Parameter selection principle

Brazing process

The process of vacuum brazing is the preparation of parts before brazing, assembly, loading of brazing material, application of flow inhibitor (if necessary), brazing, and furnace inspection. Depending on the structure of the component, loading of brazing material can also be carried out at the same time as assembly, i.e. the brazing material can be assembled as a part together with other parts. A typical example is the assembly of a brazed plate heat exchanger.

Quality Inspection Control

The brazing quality of brazed plate heat exchangers is mainly controlled by the technical sophistication and stability of the automatic vacuum brazing furnace, but quality inspection is also performed after brazing. When vacuum brazing, the surface of the parts and brazing seam is bright, making it easy to observe the brazing quality of the components directly with the naked eye or with a magnifying glass more than ten times. Brazed plate heat exchanger qualified by the appearance inspection, and the general air pressure test. Brazed plate heat exchangers with special requirements can be the hydraulic test. Pressure test after passing the brazed plate heat exchanger, but also the application of helium mass spectrometer for leakage test.

Parameter selection principle

Brazing process parameters selection principles in order to ensure adequate brazing penetration, reasonable alloying reaction, to avoid the generation of brazing defects, so as to obtain high-quality brazed joints, the need for comprehensive consideration and reasonable selection of brazing process parameters. The process parameters of brazed plate heat exchangers are vacuum level, heating speed, stabilization temperature and time, brazing temperature and time, cooling speed and mode, furnace discharge temperature, etc.

The brazed plate heat exchanger has the characteristics of a compact structure, and good sealing and pressure-bearing performance. Large heat transfer area in unit volume. The use of an ultra-thin plate structure makes the heat transfer effect reach the best state. The key technology of brazed plate heat exchanger production is the quality of stamping and vacuum brazing of the plates. If you have questions about brazed plate heat exchangers or want to buy heat exchangers, you can pay attention to Shanghai Jiangxing Chemical Equipment Co.Led. The company has been dedicated to the production and development of heat exchangers for decades and will surely meet your needs.