Method of producing metal tubular member

Details Method of producing metal tubular member Method of producing metal tubular member

2011-01-11

2011-01-11

Bryant, David P (Department: 3726)

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

C029S890080, C029S515000, C029S508000, C029S505000, C029S451000

Reexamination Certificate

active

07866044

ABSTRACT:
A method of producing a metal tubular member that is composed of two or more tube forming bodies and has at least one portion at which the tube forming bodies are superposed on each other, wherein one open annular end section of one of the tube forming bodies, which one annular end section is positioned on the inner side in the superposed section, and the other open annular end section of the other tube forming body, which the other annular end section is positioned on the outer side, are integrally joined by welding. The one annular end section is inserted into the other annular end section with the outside diameter of the one annular end section pressed by a die so as to be smaller in diameter than the inside diameter of the other annular end section, and then pressing force applied to the one annular end section on the inner side is released to cause it to be in tight contact with the inner surface of the other annular end section on the outer side.

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PCT International Search Report dated Aug. 9, 2005.

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