Method of manufacturing long dual layer metal pipe

Details Method of manufacturing long dual layer metal pipe Method of manufacturing long dual layer metal pipe

B - Operations, Transporting

21

D

B21D 39/04 (2006.01) B21C 37/06 (2006.01) B21C 37/15 (2006.01)

Patent

CA 2268697

A long dual layer metal pipe is manufactured in the following manner. Namely, a joined body of inner metal pipes is inserted into a joined body of outer metal pipes. The joined body of inner metal pipes has an outer diameter smaller than an inner diameter of the joined body of outer metal pipes. The joined body 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.

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