Abstract: In view of the intermelting leakage of fin and copper tube of air conditioner heat exchanger in the production process, the characteristics and mechanism of copper infiltration corrosion of aluminum are analyzed in combination with the leakage fault parts, and the inter melting phenomenon of fin and copper tube of heat exchanger is eliminated through standardized process design and operation treatment. The results show that the fin melting of heat exchanger can be significantly reduced by regulating the heating angle, adjusting the heating sequence of copper tube solder joints and designing and controlling the size of B value of heat exchanger, which provides an effective control method for the protection of aluminum copper penetration of air conditioner heat exchanger products.

Key words: Air conditioning, Brazing, Copper aluminum infiltration, Failure mechanism, Process optimization