B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
B21C 37/06 (2006.01) B21C 37/15 (2006.01) B23K 20/08 (2006.01) B21B 1/38 (2006.01) B21B 19/08 (2006.01)
Patent
CA 2072465
NEC 36452 ABSTRACT METHOD OF MANUFACTURING BI-METALLIC TUBING This invention relates to a method for producing bi-metallic tubing wherein a layer (3,31) of a first metal is metallurgically bonded to the exterior surface of a core component (1,29) of a second metal incompatible for solid state bonding with the first metal by processes other than explosive bonding, the resulting cylindrical bonded composite (15,25) is placed within the bore of a thick-walled tube (33) of a metal compatible for solid state bonding with the first metal and the assembly (39) is heated and expanded by passing it over a profiled mandrel (43). In passing over the mandrel sufficient pressure is developed at the interface between the bonded composite and the thick-walled tube to form a metallurgical bond at the interface. When the first metal is the same as the metal of the thick-walled tube the interface is eliminated and a bi-metallic tube consisting of a single outer layer of the first metal with a bonded lining of the second metal is produced. The method is advantageous for producing large diameter tubes having all outer layer of cheaper metal. for example, steel and a lining of more expensive metal corrosion- resistant metal, for example, nickel alloy.
Imperial Chemical Industries Plc
Marks & Clerk
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