Patent US4247306A successfully refreshed from Google Patents.
US4247306A
Expired / Lapsed
US
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Detection of flaws in metal members
Assignee: Elkem ASA
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Filing: 1979-01-17
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Granted: 1981-01-27
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Expires: 1999-01-17
Abstract
Abstract A method of detecting flaws in metal members is disclosed. The metal member is exposed to high frequency heating whereupon the temperature profile across the work piece is measured, preferably by recording with an infrared camera. The recorded data can be used for automatic marking or repair of the metal member.
Inventors
- 👤 Arnulf Berge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:36
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A method of detecting surface flaws in a non-magnetic metallic workpiece comprising: (a) heating said non-magnetic metallic workpiece by passing said workpiece through an induction heater for induction heating with a high frequency current; (b) scanning said non-magnetic metallic workpiece with an infrared camera to determine a temperature profile of the scanned portion of said non-magnetic metallic workpiece within 3 seconds of the time of heating; (c) generating an output signal in said first infrared camera corresponding to said temperature profile; (d) feeding said output signal to a data processor which controls a grinding apparatus for automatically grinding said workpiece in accordance with said temperature profile; (e) reheating said non-magnetic metallic workpiece by passing it through a second induction heater; (f) scanning said non-magnetic workpiece with a second infrared camera to determine a new temperature profile; (g) generating a correction signal corresponding to said new temperature profile; and (h) feeding said correction signal to said data processor to automatically adjust the grinding apparatus.
Claim 2
Independent Claim
163 words
A method of detecting surface flaws in a non-magnetic metallic workpiece comprising: (a) heating said non-magnetic metallic workpiece by passing said workpiece through an induction heater for induction heating with a high frequency current; (b) scanning said non-magnetic metallic workpiece with an infrared camera to determine a temperature profile of the scanned portion of said non-magnetic metallic workpiece within 3 seconds of the time of heating; (c) generating an output signal in said first infrared camera corresponding to said temperature profile; (d) feeding said output signal to a data processor which controls a grinding apparatus for automatically grinding said workpiece in accordance with said temperature profile; (e) reheating said non-magnetic metallic workpiece by passing it through a second induction heater; (f) scanning said non-magnetic workpiece with a second infrared camera to determine a new temperature profile; (g) generating a correction signal corresponding to said new temperature profile; and (h) feeding said correction signal to said data processor to automatically adjust the grinding apparatus.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |