US4404447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a welded can body
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1981-04-09
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Granted: 1983-09-13
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Expires: 2001-04-09
Abstract
Abstract A method of manufacturing a welded can body from tinplate or a tin-iron alloy plated steel sheet comprises overlapping the opposite marginal portions of a blank of the tinplate or the tin-iron plated steel sheet to form a can body preform having an overlapping portion, applying at least to the cut edges of the marginal portions of the blank a fluxing agent promoting wetting of steel with molten tin, and electrical resistance seam welding the overlapping portion in a nonoxidizing atmosphere by employing a pair of wire electrodes each covered by a layer of metallic tin on the surface thereof facing the overlapping portion. The welded portion has improved corrosion resistance, as an extruded weld portion and a remaining cut edge surface portion thereof are covered with tin transferred from the surfaces of the wire electrodes and/or the tinplate during the welding operation.
Inventors
- 👤 Yoichi Kitamura
- 👤 Hisashi Hotta
- 👤 Chikara Yurita
- 👤 Makoto Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:35
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/06; B23K11/061; B23K11/062; B23K11/063; B23K11/16; B23K11/163; B23K11/30; B23K11/309
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
194 words
In a method of manufacturing a welded can body from a surface treated steel sheet selected from the group consisting of a tinplate with a tin-iron alloy plated steel sheet, said method including overlapping opposite marginal portions of a blank of said surface treated steel sheet to form a can body preform having an overlapping portion, said opposite marginal portions having cut edges, and disposing said overlapping portion between a pair of wire electrodes supported by a pair of supporting electrodes for electrical resistance seam welding, the improvement which comprises: providing as said wire electrodes a pair of wire electrodes each having a flat surface facing said overlapping portion, and covered with metallic tin; applying at least to the cut edges of said marginal portions of said blank a fluxing agent promoting wetting of steel with molten tin; bringing said flat surfaces of said wire electrodes into contact with said overlapping portion; and conducting said electrical resistance seam welding in a nonoxidizing atmosphere to form a welded portion, whereby tin transferred from the surfaces of said wire electrodes covers an extruded weld portion and a remaining cut edge surface portion of said welded portion.
Claim 2
Dependent Claim
194 words
In a method of manufacturing a welded can body from a surface treated steel sheet selected from the group consisting of a tinplate with a tin-iron alloy plated steel sheet, said method including overlapping opposite marginal portions of a blank of said surface treated steel sheet to form a can body preform having an overlapping portion, said opposite marginal portions having cut edges, and disposing said overlapping portion between a pair of wire electrodes supported by a pair of supporting electrodes for electrical resistance seam welding, the improvement which comprises: providing as said wire electrodes a pair of wire electrodes each having a flat surface facing said overlapping portion, and covered with metallic tin; applying at least to the cut edges of said marginal portions of said blank a fluxing agent promoting wetting of steel with molten tin; bringing said flat surfaces of said wire electrodes into contact with said overlapping portion; and conducting said electrical resistance seam welding in a nonoxidizing atmosphere to form a welded portion, whereby tin transferred from the surfaces of said wire electrodes covers an extruded weld portion and a remaining cut edge surface portion of said welded portion.
Claim 3
Dependent Claim
50 words
A method as set forth in claim 1, wherein said tinplate has a tin coating weight not greater than about 2.8 g/m 2 , and the amount of said metallic tin on said wire electrodes is in the range of about 6 g/m 2 to about 17 g/m 2 .
Claim 4
Dependent Claim
173 words
In a method of manufacturing a welded can body from tinplate, including overlapping opposite marginal portions of a tinplate blank to form a can body preform having an overlapping portion, said opposite marginal portions having cut edges, and disposing said overlapping portion between a pair of wire electrodes supported by a pair of supporting electrodes for electrical resistance seam welding, the improvement which comprises: providing as said wire electrodes a pair of wire electrodes each having a flat surface facing said overlapping portion, said flat surface being greater in width than said overlapping portion; applying at least to the cut edges of said marginal portions of said blank a fluxing agent promoting wetting of steel with molten tin; bringing said flat surfaces of said wire electrodes into contact with said overlapping portion; and conducting said electrical resistance seam welding in a nonoxidizing atmosphere to form a welded portion, whereby tin transferred from the surfaces of said tinplate covers an extruded weld portion and a remaining cut edge surface portion of said welded portion.
Claim 5
Dependent Claim
173 words
In a method of manufacturing a welded can body from tinplate, including overlapping opposite marginal portions of a tinplate blank to form a can body preform having an overlapping portion, said opposite marginal portions having cut edges, and disposing said overlapping portion between a pair of wire electrodes supported by a pair of supporting electrodes for electrical resistance seam welding, the improvement which comprises: providing as said wire electrodes a pair of wire electrodes each having a flat surface facing said overlapping portion, said flat surface being greater in width than said overlapping portion; applying at least to the cut edges of said marginal portions of said blank a fluxing agent promoting wetting of steel with molten tin; bringing said flat surfaces of said wire electrodes into contact with said overlapping portion; and conducting said electrical resistance seam welding in a nonoxidizing atmosphere to form a welded portion, whereby tin transferred from the surfaces of said tinplate covers an extruded weld portion and a remaining cut edge surface portion of said welded portion.
Claim 6
Dependent Claim
23 words
A method as set forth in claim 3, wherein said tinplate contains at least about 2.8 g/m 2 of tin on its surface.
Claim 7
Dependent Claim
134 words
In a method of manufacturing a welded can body from a tin-iron alloy plated steel sheet, said method including overlapping opposite marginal portions of a blank of said steel sheet to form a can body preform having an overlapping portion, said marginal portions having cut edges, and disposing said overlapping portion between a pair of wire electrodes supported by a pair of supporting electrodes for electrical resistance seam welding, the improvement which comprises: providing as said wire electrodes a pair of wire electrodes each having a flat surface facing said overlapping portion, said flat surface being greater in width than said overlapping portion, and covered with metallic tin; applying to the cut edges and the surfaces of said marginal portions of said blank a fluxing agent promoting the wetting of steel with molten tin;
Claim 8
Dependent Claim
134 words
In a method of manufacturing a welded can body from a tin-iron alloy plated steel sheet, said method including overlapping opposite marginal portions of a blank of said steel sheet to form a can body preform having an overlapping portion, said marginal portions having cut edges, and disposing said overlapping portion between a pair of wire electrodes supported by a pair of supporting electrodes for electrical resistance seam welding, the improvement which comprises: providing as said wire electrodes a pair of wire electrodes each having a flat surface facing said overlapping portion, said flat surface being greater in width than said overlapping portion, and covered with metallic tin; applying to the cut edges and the surfaces of said marginal portions of said blank a fluxing agent promoting the wetting of steel with molten tin;
Claim 9
Dependent Claim
56 words
bring said flat surfaces of said wire electrodes into contact with said overlapping portion; and conducting said electrical resistance seam welding in a nonoxidizing atmosphere to form a welded portion, whereby tin transferred from the surfaces of said wire electrodes covers an extruded weld portion and a remaining cut edge surface portion of said welded portion.
Claim 10
Dependent Claim
56 words
bring said flat surfaces of said wire electrodes into contact with said overlapping portion; and conducting said electrical resistance seam welding in a nonoxidizing atmosphere to form a welded portion, whereby tin transferred from the surfaces of said wire electrodes covers an extruded weld portion and a remaining cut edge surface portion of said welded portion.
Claim 11
Dependent Claim
34 words
A method as set forth in claim 5, wherein the amount of said metallic tin on said wire electrodes is in the range of about 6 g/m 2 to about 25 g/m 2 .
Claim 12
Dependent Claim
18 words
A method as set forth in claim 1, 3, or 5, wherein said fluxing agent comprises carboxylic acid.
Claim 13
Dependent Claim
22 words
A method as set forth in claim 1, 3, or 5, wherein said fluxing agent comprises a hydrohalogenic acid salt of ethanolamine.
Claim 14
Dependent Claim
53 words
A method as set forth in claim 1 or 5, wherein said tin-iron alloy plated steel sheet is a low carbon steel sheet covered with a layer composed substantially of an alloy layer of FeSn 2 , said layer having a coating weight of 0.05 to 1.0 g/m 2 in terms of tin.
Claim 15
Dependent Claim
38 words
A method as set forth in claim 9, wherein said layer has a metallic tin layer on said alloy layer of FeSn 2 , said metallic tin layer being thinner than said alloy layer of FeSn 2 .
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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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |