US3752952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for precision setting of the electron beam in electron beam welding
Assignee: Messer Griesheim GmbH
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Filing: 1971-03-23
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Granted: 1973-08-14
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Expires: 1991-03-23
Abstract
Abstract A process for the precise setting of the electron beam in electron beam welding by the capturing of the electrons scattered back from the moving workpiece or workpieces and/or through sensing of the secondary electrons in which the setting is performed by determining the directional distribution of the leaked back electrons and/or secondary electrons as a function of the geometry of the weld cavity produced. Since the angular distribution of the electrons leaked back by the weld cavity and/or the secondary electrons emitted therefrom is asymmetric in the half-space above the welding point, this distribution permits the geometry of the weld cavity to be deduced respectively the corresponding setting of the electron beam to be determined precisely.
Inventors
- 👤 J Ruge
- 👤 H Eggers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:00
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/30; H01J37/304; B; B23; B23K; B23K15/00; B23K15/0013; H01J37/02; H01J37/21
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
In combination in welding apparatus, a source of an electron welding beam, and means for automatically adjusting the focus of said beam relative to the surface of workpiece means, said automated beam focusing means comprising plural spaced electron detectors for recovering electronS reflected and emitted at a weld cavity in the workpiece means, in associated, differing spacial directions, responsive to the impingement of said electron beam thereon, said electron reflected and emitted at said weld cavity exhibiting an asymmetrical electron angular distribution pattern, means for focusing said electron beam relative to the workpiece means, difference determining means operably connected to said electron detectors for providing a difference signal dependent upon the asymmetry of the angular distribution pattern of electrons reflected and emitted by the weld cavity as sent by said electron detectors, and means responsive to said difference signal for controlling said electron beam focusing means.
Claim 2
Dependent Claim
146 words
In combination in welding apparatus, a source of an electron welding beam, and means for automatically adjusting the focus of said beam relative to the surface of workpiece means, said automated beam focusing means comprising plural spaced electron detectors for recovering electronS reflected and emitted at a weld cavity in the workpiece means, in associated, differing spacial directions, responsive to the impingement of said electron beam thereon, said electron reflected and emitted at said weld cavity exhibiting an asymmetrical electron angular distribution pattern, means for focusing said electron beam relative to the workpiece means, difference determining means operably connected to said electron detectors for providing a difference signal dependent upon the asymmetry of the angular distribution pattern of electrons reflected and emitted by the weld cavity as sent by said electron detectors, and means responsive to said difference signal for controlling said electron beam focusing means.
Claim 3
Dependent Claim
38 words
A combination as in claim 1 further comprising means for traversing said electron beam relative to the workpiece means in a given direction, and wherein said electron detectors are spaced in a direction parallel to said given direction.
Claim 4
Independent Claim
99 words
The method of automatically maintaining the focus of an electron welding beam in a preferred relationship with respect to a weld seam formed in workpiece means, comprising the steps of directing said electron beam to said workpiece means via focusing means, measuring at discrete locations the spacial distribution pattern of electrons reflected and emitted at a weld cavity in said workpiece means responsive to said incident electron beam, measuring the asymmetry of the reflected and emitted electron angular distribution, and adjusting the focus of the electron beam relative to the workpiece means in accordance with the measured distribution asymmetry.
Claim 5
Independent Claim
99 words
The method of automatically maintaining the focus of an electron welding beam in a preferred relationship with respect to a weld seam formed in workpiece means, comprising the steps of directing said electron beam to said workpiece means via focusing means, measuring at discrete locations the spacial distribution pattern of electrons reflected and emitted at a weld cavity in said workpiece means responsive to said incident electron beam, measuring the asymmetry of the reflected and emitted electron angular distribution, and adjusting the focus of the electron beam relative to the workpiece means in accordance with the measured distribution asymmetry.
Claim 6
Dependent Claim
47 words
The method as in claim 3 further comprising the steps of moving the workpiece means relative to the beam, directing the electron beam orthogonal to the workpiece means, and detecting an asymmetry of the reflected and emitted spacial electron distribution oriented in the direction of workpiece motion.
References Cited (Backward Citations)
US3291959A
Cited
US3329813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |