|关键词: 微通道换热器 扁管槽 炉中钎焊 焊缝成形
|Key process improvement for welding between flat tube and manifold of microchannel heat exchanger
Yin Xuntong, Duan Yujian
|Through research on the process of furnace brazing between flat tube and manifold of microchannel heat exchanger, based on the related theoretical knowledge and experimental data, the existing structure of flat tube groove is improved. The improved flat tube groove structure is adopted, the welding quality is improved significantly, the flat tube is hardly close to one side of flat tube groove, so the defects of weld tail are greatly reduced, and the average defect rate decreased from 20% to：percentage of weld defects in the middle section not more than 2%, percentage of weld defects in the fixed section not more than 5%. thus a good weld formation is achieved, and the risk of leakage is reduced,the welding quality is guaranteed.In addition, on the basis of the welding experiment, the causes of welding defects and improvement mechanism are analyzed.
|Key words: microchannel heat exchanger flat tube groove furnace brazing weld forming