US4302658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding silicon steel
Assignee: Allegheny Ludlum Corp
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Filing: 1980-09-29
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Granted: 1981-11-24
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Expires: 2000-09-29
Abstract
Abstract A process for improving the mechanical properties of welded silicon steel. The weld heat affected area of welded silicon steel is heat treated while retaining the welded lengths within a clamping fixture so as to restrain movement thereof from the initiation of welding through the completion of the heat treatment.
Inventors
- 👤 Jack M. Beigay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:46
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
In a process for welding two lengths of steel having from 2.5 to 4.0% silicon and less than 0.008% boron, comprising the steps of: clamping said lengths in a fixture to restrain movement thereof, welding said clamped lengths, and heat treating the weld heat affected area of said lengths at a temperature in excess of 1500° F., wherein the improvement comprises: retaining said clamped lengths within the fixture from the initiation of the welding step through the completion of the heat treating step, and after heat treating, cold rolling the welded length.
Claim 2
Dependent Claim
92 words
In a process for welding two lengths of steel having from 2.5 to 4.0% silicon and less than 0.008% boron, comprising the steps of: clamping said lengths in a fixture to restrain movement thereof, welding said clamped lengths, and heat treating the weld heat affected area of said lengths at a temperature in excess of 1500° F., wherein the improvement comprises: retaining said clamped lengths within the fixture from the initiation of the welding step through the completion of the heat treating step, and after heat treating, cold rolling the welded length.
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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) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |