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BRAZING METHOD

  • US 20170320170A1
  • Filed: 11/13/2015
  • Published: 11/09/2017
  • Est. Priority Date: 12/11/2014
  • Status: Active Grant
First Claim
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1. A brazing method for brazing an object to be processed, which is composed of an aluminum material and has a hollow portion, to form an inner join part that faces the hollow portion and also an outer join part that faces an external space, the brazing method comprising:

  • preparing the object to be processed that comprises a brazing sheet including;

    a core layer having a chemical composition in which the content of Mg is less than 0.2% (mass %, likewise hereinbelow), the remainder being composed of Al and unavoidable impurities; and

    a filler metal layer having a chemical composition that indispensably contains Si;

    4.0 to 13.0% and Bi;

    0.01 to 0.3%, and further contains at least one element selected from the group consisting of Li;

    0.004 to 0.08% and Be;

    0.006 to 0.12%, the Mg content being less than 0.1% and the remainder being composed of Al and unavoidable impurities, the filler metal layer being clad onto at least one side of the core layer;

    assembling the object to be processed such that the filler metal layer is present at locations that will form both the inner join part and the outer join part;

    next, applying a flux onto the filler metal layer that is present at the location that will form the outer join part; and

    subsequently, heating and brazing the object to be processed in an inert gas atmosphere.

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