ALUMINUM-ALLOY BRAZING SHEET, MANUFACTURING METHOD THEREFOR, AND BRAZING METHOD FOR ALUMINUM HEAT EXCHANGER

摘要

The present invention provides an aluminum-alloy brazing sheet that encloses a flux. Said brazing sheet is used in a heat exchanger that is brazed by heating without the application of flux in an inert-gas atmosphere. This brazing sheet is characterized by comprising a core material, one or both surfaces of which are clad in an Al-Si aluminum-alloy brazing filler that contains 6-13% silicon. This brazing sheet is further characterized in that a fluoride flux is enclosed at the interface(s) between the core material and the brazing filler and some or all of said flux is subjected to melting and then solidification. This brazing sheet does not hamper hot rollability, and the problem of flux flying about and getting on equipment during hot rolling is also avoided.