Patent US3743776A successfully refreshed from Google Patents.
US3743776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for tracing seams for welding by electron bombardment
Assignee: Individual
•
Filing: 1971-05-05
•
Granted: 1973-07-03
•
Expires: 1991-05-05
Abstract
Abstract This invention concerns electron bombardment welding techniques. The invention teaches a method and a device for keeping a welding beam centered on a seam plane. The detector includes two detectors arranged symetrically with respect to a seam plane. They furnish a signal whose amplitude increases as the electronic beam spot moves away from the seam plane center and approaches the edge of one of the pieces being joined. A servo-system, without oscillation, brings the beam back into the axis of the seam plane. The device can be used in welding big pieces.
Inventors
- 👤 J Delort
- 👤 F Corcelle
- 👤 J Angely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:09
CPC Classifications
G; G06; G06K; G06K11/00; G06K11/02; H; H01; H01J; H01J37/00; H01J37/30; H01J37/304
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A device for keeping an electronic welding beam, operating with its full intensity, centered in a seam plane comprising: an electron gun, including deflection coils for producing said welding beam, a pair of detectors disposed symmetrically about said seam plane for measuring the flow of primary back scattered electrons resulting from said welding beam, the flow of primary back scattered electrons received by one of the detectors abruptly increasing as the welding beam intersects an edge of one of the pieces being welded along the seam plane, means, coupled to said detectors, for producing a signal indicative of the difference in the flow of said primary back scattered electrons measured by said probes and means responsive to said signal for controlling said deflection coils to center said welding beam in the seam plane in response to the compared value of said flow.
Claim 2
Independent Claim
142 words
A device for keeping an electronic welding beam, operating with its full intensity, centered in a seam plane comprising: an electron gun, including deflection coils for producing said welding beam, a pair of detectors disposed symmetrically about said seam plane for measuring the flow of primary back scattered electrons resulting from said welding beam, the flow of primary back scattered electrons received by one of the detectors abruptly increasing as the welding beam intersects an edge of one of the pieces being welded along the seam plane, means, coupled to said detectors, for producing a signal indicative of the difference in the flow of said primary back scattered electrons measured by said probes and means responsive to said signal for controlling said deflection coils to center said welding beam in the seam plane in response to the compared value of said flow.
Claim 3
Dependent Claim
107 words
The device of claim 1, wherein said means for producing said difference indicative signal includes first differential amplifier means coupled to said probes, said means for controlling including digital to analog converter means for producing a potential proportional to the output of said differential amplifier means, means for generating a pre-set voltage, and second differential amplifier means, one input of said second differential amplifier means being coupled to said pre-set voltage generating means, another input of said second differential amplifier means being connected to the output of said digital to analog converter means, the output of said second differential amplifier means being coupled to said deflection coils.
Claim 4
Dependent Claim
38 words
The device of claim 2, further including resistance means serially connected between said probes and said first differential amplifier means for blocking thermal electrons and ions for entering the probes whereby said probes receive only back scattered electrons.
Claim 5
Dependent Claim
38 words
The device of claim 3, wherein said probes are cylindrical in shape, the inputs thereto including a screen having an aperture, the diameter thereof being caused to vary in accordance with the intensity of the incident welding beam.
Claim 6
Dependent Claim
74 words
The device of claim 4, wherein said means for controlling further includes a safety system comprising: threshold gates means coupled to said first differential amplifier means, an operator signal and control means coupled to said threshold gate means for generating and operator signal and decreasing the electron beam power in response to an output from said threshold gate means indicating that the beam spot has deviated from the seam plane by a predetermined amount.
Claim 7
Dependent Claim
85 words
The device of claim 2 further including; a pulse source for altering the digital content of said digital to analog converter, a pair of coincident gates receiving pulses from said pulse source and coupled respectively to an incrementing and decrementing input of said converter, threshold gate means coupled between said first differential amplifier and said pair of coincident gates for selectively enabling one of said gates in response to the polarity of a signal having at least a predetermined value from said first differential amplifier.
References Cited (Backward Citations)
US3152238A
Cited
US3276902A
Cited
US3329813A
Cited
US3426174A
Cited
US3513285A
Cited
US3472997A
Cited
US3609288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |