Brazing procedure in inert atmosphere
AssigneeMitsubishi Jukogyo Kabushiki Kaisha
InventorsChikara Fujiwara, Takashi Onda, Akira Fukushima
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Abstract
A brazing procedure including the steps of retaining a component (7) having a brazing section (2) therein by means of a die assembly (3, 4) which is compressed by a hot press (8), admitting (6) an inert gas into the component to produce an inert atmosphere inside the component having a pressure which is higher than the outer pressure, and then heating (5) the component thereby brazing the section. A brazing clearance is maintained at a proper amount prior to brazing, and the outer configuration of the component is maintained with enhanced precision. The brazing operation is also advantageous due to its reduced operating cost.
Claims17
A brazing process for brazing a hollow workpiece in the inside thereof comprising:
- providing a die having at least two die parts relatively moveable toward and away from each other, said die parts having die surfaces conforming to the external shape of the finished workpiece and forming a die cavity;
- providing brazing material on at least one interior section of a hollow workpiece to be brazed;
- positioning said hollow workpiece in said die cavity;
- pressing said die parts toward each other in a press so that said die surfaces conform to the desired external configuration of the finished workpiece;
- injecting an inert gas into the interior of said hollow workpiece at a pressure sufficient to urge said workpiece against said die surfaces;
- heating said workpiece to effect said brazing;
- and
- maintaining said pressure of said inert gas sufficient to urge said workpiece against said die surfaces and prevent inward deformation of said workpiece during said brazing.
Dependencies are inferred from the claim text.