High reliability double-chambered shielding system for welding
US4528436A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 1984 |
| Grant date | Jul 9, 1985 |
| Priority date | — |
| Expiry date | Mar 20, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/326
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An improved system (50) for shielding a circumferential region about elongate workpieces from air contamination during welding or heat treatment includes a pair of generally cylindrical shields (52, 54) which define central openings for receiving the workpieces, and which are positioned in longitudinally spaced apart relationship about the joint or region to be welded or heat treated. The shields (52, 54) are of symmetrical but otherwise identical construction. For example, the shield (52) includes a first annular chamber (70) and associated annular diffuser positioned adjacent the process zone, and a second annular chamber (86) and associated cylindrical diffuser (90) extending away from the zone. The chambers (70, 86) are connected to independent sources of inert gas, which flows both into and out away from the process zone to eliminate air contamination from aspiration and the like. A slotted sleeve (98) is preferably provided over the shields (52, 54) to substantially enclose the circumferential region therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.