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Application of vacuum brazing heat treatment technology
Advantages of vacuum brazing technology
Vacuum brazing is an advanced welding method in which the workpiece is in a vacuum state, that is, in a negative pressure atmosphere, the solder is heated into liquid by a heat source, and the gaps between solid parts are filled by the action of capillaries, and a metallurgical bond is formed with them. Its advantages: it can connect parts by metallurgical methods without melting the parent material, and has good adaptability to dissimilar metals and tools with different qualities.
Preparation before vacuum brazing
For vacuum brazing, the preparation work before brazing has a significant impact on the quality of brazing. In a sense, it is one of the keys to determine the success or failure of brazing.
First, soak the parts, the silver-copper-palladium materials processed according to the drawings, and the brazing fixtures in gasoline, carefully clean the grease in the parts and the holes of the parts with a small brush, and then wash them again with clean gasoline. After evaporation, use an ultrasonic gas phase cleaning machine to clean for 20~30min and then dry them to allow the cleaning liquid to fully evaporate. Otherwise, if the oil is not completely removed, the brazing material will not be able to wet the fiber joint surface. After cleaning, put on fine yarn gloves and place the three sections of mx4nm solder in the welding holes respectively, and then put the assembled workpiece with the holes facing up (the solder in the holes should not be too long) in the welding fixture and put it into the furnace. When entering the furnace, be careful to prevent vibration to avoid changing the position of the parts in the fixture.
Selection of vacuum brazing temperature
The selection of vacuum brazing temperature is very important, so the furnace temperature uniformity must meet the process requirements. When the vacuum degree in the furnace is evacuated to 0.67Pa (above 5×10-3Tam), it is allowed to enter the furnace for heating, and the heating rate is controlled at 15℃/min. Inert gas should be refilled as much as possible during the vacuum process. The main purpose is to clean the oxidizing atmosphere in the furnace. When the temperature continues to rise to the brazing temperature, start the purified gas protection heating (99.999% high-purity hydrogen) to prevent the alloy elements from volatilizing at high temperatures. After 40 minutes of heat preservation, air cooling and start the phoenix fan to quickly cool to room temperature, and brazing is completed.
The quality of the parts after vacuum brazing meets the requirements, there is uniform solder seepage at the weld, the surface of the parts is bright and non-oxidized, and 100% of the parts are subjected to tensile tests. The tensile force of the weld is above 455N and does not fall off.
After vacuum brazing of parts and components, all technical indicators have reached the technical standards, and the process is reliable. After brazing, there is no need for post-weld heat treatment, which simplifies the process and reduces costs.
Vacuum Brazing Furnace