Method and apparatus for detecting and regulating position of welding electron beam
US4654506A · kind A · utility
12Cited by
11References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1985 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Feb 20, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J37/304
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for detecting and regulating a focused condition of an electron beam emitted from an electron gun of an electron beam welding apparatus. An electron beam of a low intensity is first directed onto the workpiece. The coil current of an electromagnetic condenser lens used to focus the electron beam is then varied linearly. The resulting electrons and other radiation produced from the workpiece as a result of this irradiation is then sensed and a signal corresponding to the intensity thereof is produced. The focus position of the electron beam is determined in accordance with variations in this signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.