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Title:
METHOD FOR MANUFACTURING INTERNAL/EXTERNAL DOUBLE TUBULAR BODY
Document Type and Number:
Japanese Patent JP2006026690
Kind Code:
A
Abstract:

To easily manufacture an internal/external double tubular body which has high heat resistance and does not cause fine wrinkles, crack or buckling on the surface, by reversing work, regarding the manufacturing method of the internal/external double tubular body to be used on a reformer for fuel cells, for example, or the like.

The internal/external double tubular body is manufactured by performing butt welding of a metallic tubular body 2 having workability better than that of a metallic tubular body 1 having oxidation resistance at a high temperature on one end of the metallic tubular body 1 and reversing the metallic tubular body 2 having good workability successively from the side of the free end to the side of the inside surface or the outside surface of the metallic tubular body 1 having the oxidation resistance at a high temperature. As the metallic tubular body 1 having the oxidation resistance at the high temperature, for example, stainless steel whose heat-resistant temperature is ≥ 900°C is used and as the metallic tubular body 2 having good workability, for example, stainless steel whose elongation percentage is ≥ 45% is used.


Inventors:
UNNO HISASHI
KOJIMA NOBUHISA
KENGYOYA SATORU
Application Number:
JP2004209447A
Publication Date:
February 02, 2006
Filing Date:
July 16, 2004
Export Citation:
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Assignee:
SANKEI GIKEN KOGYO CO LTD
International Classes:
B21D51/18; B21D19/12; H01M8/06
Domestic Patent References:
JP2004025215A2004-01-29
JPH09224850A1997-09-02
JPS5252163A1977-04-26
JPS6373923A1988-04-04
JP2866002B21999-03-08
Attorney, Agent or Firm:
Ryuji Takahashi
Shigeyuki Motoi