Patent ID: 9364913
Filing Date: 2016-06-14
CPC Classification: B23K,B32B,C22C,F28D,F28F,Y10T

Claim Text:
1. A method for manufacturing a heat exchanger that includes sheet materials and a flow passage through which a refrigerant passes, the method comprising: stacking the sheet materials; brazing the sheet materials without use of flux, each sheet material including (i) a core alloy containing Al as a major component, more than 0 mass % and less than or equal to 1.8 mass % of Mn, and unavoidable impurities, and (ii) a brazing filler alloy cladded to a surface of the core alloy, the brazing filler alloy containing Al as a major component, 0.1 to 1.2 mass % of Mg, 4 to 13 mass % of Si, 0.01 to 0.15 mass % of Bi, and unavoidable impurities; or each sheet material including (i) a core alloy containing Al as a major component, more than 0 mass % and less than or equal to 1.8 mass % of Mn, 0.3 to 1.3 mass % of Mg, and unavoidable impurities, and (ii) a brazing filler alloy cladded to a surface of the core alloy, the brazing filler alloy containing Al as a major component, 0.1 to 1.2 mass % of Mg, 4 to 13 mass % of Si, and unavoidable impurities; and producing a fillet length of more than or equal to 30 mm, wherein the brazing of the sheet materials includes: the reducing of the partial pressure of oxygen includes: the joining of the both side end parts of the sheet materials includes: