US3696228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure vessel and method of making
Assignee: Hoskins Manufacturing Co
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Filing: 1970-09-24
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Granted: 1972-10-03
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Expires: 1990-09-24
Abstract
Abstract A pressure vessel with corrosion resistant lining and inexpensive overall is constructed in two steps. First a thinwalled vessel is prepared from integrally clad plate by conventional means, the cladding thus being of controlled quality, thickness and well bonded to the backing metal. Then the thickness of the backing metal is built up to the desired dimension preferably by electroslag deposition in the continuous casting process. The electroslag layer bonds to the backing layer without penetrating to the inner layer, and thus preserves the corrosion resistance of the lining. Heavy tube sheets are prepared in similar manner by depositing additional backing metal behind a clad metal plate.
Inventors
- 👤 Royal David Thomas Jr
- 👤 James E Norcross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:23
CPC Classifications
B; B23; B23K; B23K25/00; B21; B21D; B21D51/00; B21D51/16; B21D51/24; F; F16; F16L; F16L9/00; F16L9/02; F16L9/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
301 words
A method of producing heavy walled articles of bimetallic construction, comprising preparing at least a portion of a thin walled article from bimetallic clad metal having a wrought corrosion resisting layer on one side and a wrought layer of structural steel backing metal on the other side, the two layers being joined to make bimetallic clad metal, disposing at least a part of the above portion of the wall of the article vertical, setting up a first dam enclosing a portion of the vertical wall of the article at the wrought structural steel backing layer, electroslag welding in the space enclosed by the first dam against the wrought structural steel backing metal layer to deposit overlay metal, relatively advancing the first dam and the electroslag welding operation with respect to the article to form a first bead of overlay metal against the wrought structural steel backing layer and welded to it, setting up a second vertical dam enclosing a space against further vertical localized areas of the wrought structural steel backing metal layer and one edge of the previous overlay weld bead, electroslag welding in the space defined by the second dam to deposit overlay metal against the wrought structural steel backing metal layer and against the edge of the previous weld bead to weld to the wrought structural steel backing metal layer and to the previous weld bead, relatively advancing the second dam and the electroslag welding operation with respect to the article to make further beads of electroslag overlay metal, and artificially cooling the beads of overlay metal, thus depositing on the previously mentioned other side of the article an overlay layer welded to the wrought structural steel backing metal layer, the completed overlay layer being of such thickness that its strength is greater than said backing metal layer.
Claim 2
Independent Claim
301 words
A method of producing heavy walled articles of bimetallic construction, comprising preparing at least a portion of a thin walled article from bimetallic clad metal having a wrought corrosion resisting layer on one side and a wrought layer of structural steel backing metal on the other side, the two layers being joined to make bimetallic clad metal, disposing at least a part of the above portion of the wall of the article vertical, setting up a first dam enclosing a portion of the vertical wall of the article at the wrought structural steel backing layer, electroslag welding in the space enclosed by the first dam against the wrought structural steel backing metal layer to deposit overlay metal, relatively advancing the first dam and the electroslag welding operation with respect to the article to form a first bead of overlay metal against the wrought structural steel backing layer and welded to it, setting up a second vertical dam enclosing a space against further vertical localized areas of the wrought structural steel backing metal layer and one edge of the previous overlay weld bead, electroslag welding in the space defined by the second dam to deposit overlay metal against the wrought structural steel backing metal layer and against the edge of the previous weld bead to weld to the wrought structural steel backing metal layer and to the previous weld bead, relatively advancing the second dam and the electroslag welding operation with respect to the article to make further beads of electroslag overlay metal, and artificially cooling the beads of overlay metal, thus depositing on the previously mentioned other side of the article an overlay layer welded to the wrought structural steel backing metal layer, the completed overlay layer being of such thickness that its strength is greater than said backing metal layer.
Claim 3
Dependent Claim
41 words
A method of claim 1, in which the overlay layer is deposited against a vertical side of a cylindrical wall of the article and the article is rotated to relatively advance the electroslag welding operation while the dams are held stationary.
References Cited (Backward Citations)
US1709729A
Cited
US2133058A
Cited
US2191481A
Cited
US2427350A
Cited
US3444349A
Cited
US3555236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |