Pressure-differential method for sleeve-to-tube joining
US4514614A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 1982 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Aug 18, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/0284
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The pressure-differential method for sleeve-to-tube joining comprises inserting a sleeve within a tube and joining the sleeve to the tube. An internal heating device is then inserted into the sleeve for bonding the sleeve to the tube. The portion of the sleeve to be joined is then sealed so that the portion of the sleeve to be joined may be internally pressurized. Once the sleeve has been so pressurized, the heating operation may be begun. In the case of welding, as the welding progresses the molten weld pool under the arc is continuously driven by the internal pressure gradient toward the external tube. In this manner the arc force is cushioned by the molten pool at all times thus preventing the weld arc from piercing through the sleeve. In the case of brazing, as the heating progresses the sleeve becomes more pliable such that the internal pressure causes the sleeve and braze material to closely contact the inner surface of the tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.