! Harbin Institute of Technology, National Key to Modern Welding Technology. The contact part of the fin and the plate, the contact part of the gasket and the plate, the contact part 3 of the joint and the plate, and the contact part 4 of the two plates shown are all welded by a vacuum brazing technique. In order to ensure the quality of brazed joints. Each layer of aluminum plate-fin coolers is brazed on two separate LT-3 plates, and a cavity is located in the middle to facilitate the flow of cooling water from the middle. This design of the joint facilitates the flow of coolant in the intermediate cavity during use of the cooler, but due to the LT-3 plate and fin, the plate and the plate, the plate and the joint, and the plate and the middle A large number of brazed joints exist between the gaskets. These joints require one-time welding in the vacuum brazing process, and it is very easy for some joints to be unwelded in the brazing process. The shape of each joint is as shown. ) For each piece of fins and plate combination diagram. ') Metallographic photos for solder joints. When assembling, the fins and the plate should be in close contact to ensure the welding quality. After welding, analysis shows that the LT-3 aluminum sheet contains a considerable amount of Mg in the skin. Vacuum brazing is a method of brazing in a vacuum furnace without adding flux. The Mg contained in the welding material is used. Alloying elements play an important role in removing oxide films. Mg can reduce A1 oxide at the brazing temperature, and can react with A1, 0 on the surface of the base metal to directly remove the oxide film, so that the solder can be smoothly wetted and spread on the surface of the base metal, and this element can also Remove 0 and moisture from the brazing atmosphere. Welding Technology, 2001, Gan Weiping, Wei Jiahong, Xiao Yaqing, et al. Calculation of Composite Coating Ratio for Hot Rolling of Three Layers Composite Aluminum Alloy Strip . Chinese Journal of Nonferrous Metals, 1998, 2) 206-209. Yang Zhiqiang, Sun Hai'an. Automotive aluminum heat exchanger manufacturing technology and new aluminum applications. Light Metal, 1998, 2) 52-55. Zhong Xiangyang, Jiang Jinlong. Vacuum Brazing Industry of Tube and Tube Heat Exchangers and Factors Affecting Brazing Quality . Welding, 1999, 11) 23-26. (Editor: Song Xuhong)
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Research on Vacuum Brazing Technology of Aluminum Cooler for High-class Car
Research on Vacuum Brazing Technology of Aluminum Cooler for High-class Car
The core tips:! Harbin Institute of Technology, National Key to Modern Welding Technology. The contact part of the fin and the plate, the contact part of the gasket and the plate, the contact part 3 of the joint and the plate, and the contact part 4 of the two plates shown are all welded by a vacuum brazing technique. To ensure the brazing