B - Operations – Transporting – 21 – K
Patent
B - Operations, Transporting
21
K
13/11, 26/155
B21K 21/00 (2006.01) B23K 20/12 (2006.01) F16L 55/00 (2006.01)
Patent
CA 1145534
ABSTRACT OF THE DISCLOSURE An inner stainless-steel tube having an outer frustoconical faying surface is fitted into an outer carbon-steel tube having a matching inner frustoconical faying surface, and these tubes are friction welded over their entire faying surfaces by pressing the tubes together in their axial direction to obtain a high contact pressure due to a wedge action and, at the same time, imparting rotation thereto relative to each other thereby to obtain an integrally bonded, laminated, tubular blank, which is then extended by a suitable process such as rolling into a clad steel tube. The tubular blank can also be slit in its axial direction and flattened into a laminated flat blank, which can be rolled into a clad steel plate. The inner tube may be replaced by a solid core metal. In this case, an integrally bonded blank made up of the inner core metal and the outer tube is extended into a clad steel tube or into a clad steel shape.
358935
Fetherstonhaugh & Co.
Kawasaki Jukogyo Kabushiki Kaisha
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