Method of producing multiple-wall, composite tubular structures
US4449281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1982 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | Mar 16, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49865
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A double-wall composite pipe is produced by inserting an inner pipe in an outer pipe, filling the inner pipe with cold water under pressure to cause the inner pipe to expand plastically into tight contact with the outer pipe, applying heat to the outer part of the outer pipe by high-frequency induction heating, thereby to establish a locally heated zone thereof around the circumference thereof and causing the heated zone to travel from one end to the other end of the outer pipe thereby to cause it to successively expand locally in diameter in the travelling heated zone. The pressure in the inner pipe then is removed, the pipes thereafter being permitted to attain the ambient temperature, thereby to obtain an interference fit therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.