VERFAHREN ZUR FORTLAUFENDEN HERSTELLUNG EINES DOPPELWAND-WELLROHRES MIT ROHRMUFFE, DAS DOPPELWAND-WELLROHR UND DIE VORRICHTUNG ZUR DURCHFÜHRUNG DES VERFAHRENS

摘要

The method involves extruding external tube (37) and internal tube (39). The internal tube and troughs (40) of external tube are welded together and external tube is expanded to form expanded area for pipe socket (41). A transition portion (61) is formed between pipe socket and adjacent trough and area between internal and external tubes is vented into adjacent elevation (38) in the vicinity of transition portion. Independent claims are also included for the following: (1) twin-wall pipe; and (2) apparatus for manufacture of twin-wall pipe.