EP 0950441 A3 20010502 - Method of manufacturing long dual layer metal pipe
Title (en)
Method of manufacturing long dual layer metal pipe
Title (de)
Verfahren zur Herstellung eines doppelwandigen Metallrohres
Title (fr)
Procédé de fabrication d'un tube métallique à paroi double
Publication
Application
Priority
JP 9552998 A 19980408
Abstract (en)
[origin: EP0950441A2] The present invention relates to a method for manufacturing a long dual layer metal pipe (50) which comprises the following steps. Namely, a joined body (30) of inner metal pipes is inserted into a joined body (10) of outer metal pipes. The joined body (30) of inner metal pipes has an outer diameter smaller than an inner diameter of the joined body (10) of outer metal pipes. The joined body (30) of inner metal pipes has one or more joining portions. The joined body of outer metal pipes has one or more joining or clamping portions. Then the joined body of inner metal pipes is expanded to manufacture a dual layer metal pipe (50). <IMAGE>
IPC 1-7
IPC 8 full level
B21C 37/06 (2006.01); B21C 37/15 (2006.01); B21D 39/04 (2006.01); B23K 20/00 (2006.01)
CPC (source: EP)
B21C 37/06 (2013.01); B21C 37/154 (2013.01)
Citation (search report)
- [A] EP 0089379 A1 19830928 - KAWASAKI HEAVY IND LTD [JP]
- [A] FR 1072416 A 19540913 - FOSTER WHEELER LTD
- [A] US 1827437 A 19311013 - PASCOE ALFRED H
- [AD] PATENT ABSTRACTS OF JAPAN vol. 008, no. 002 (M - 266) 7 January 1984 (1984-01-07)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0950441 A2 19991020; EP 0950441 A3 20010502; CA 2268697 A1 19991008; JP H11290939 A 19991026; NO 991665 D0 19990408; NO 991665 L 19991011
DOCDB simple family (application)
EP 99106946 A 19990408; CA 2268697 A 19990408; JP 9552998 A 19980408; NO 991665 A 19990408