US4030525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion-resistant sheet steel weld
Assignee: Robert Bosch GmbH
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Filing: 1975-07-18
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Granted: 1977-06-21
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Expires: 1995-07-18
Abstract
Abstract To prevent flowing of coating material on corrosion-protected sheet steel, such as a zinc coating, when making overlap weld seams, the end portion of at least one of the steel sheets is formed with openings which extend from adjacent the outer edge of the end portion inwardly, to leave projections between the openings, the projections being entirely within the overlap and leaving a short strip of solid material in the overlap region, so that the weld will occur at concentrated hot spots of the material, and contamination of the welding electrodes by the zinc coating material is prevented. The openings may extend clear to the edge in the form of notches, leaving intervening teeth, or they may be punched holes.
Inventors
- 👤 Gerd Bassler
- 👤 Arno Altpeter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:30
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/23; B23K33/00; B23K33/004; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12292
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
154 words
Corrosion-resistant sheet steel weld in which two overlapping steel sheets (2, 4; 10, 13; 18, 19; 21, 23, 26) are placed with their respective end portions in overlapping relationships comprising two overlapping steel sheets (2, 4; 10, 13; 18, 19; 21, 23, 26); a coating of corrosion-resistant metal (1, 3) at adjacent, overlapping surfaces of said sheets; a resistance weld seam (8, 14, 38, 22) formed at the interface of said sheets at least in the regions of the overlap of said projections and the other sheet; and means providing for localized current density upon welding comprising openings (5, 11, 20, 24) formed in at least the end portions of at least one of the steel sheets extending from adjacent the outer edge of the end portion inwardly in said end portion leaving projections (6, 15, 25) between said openings, said openings having a depth less than the extent of overlap of said sheets.
Claim 2
Dependent Claim
154 words
Corrosion-resistant sheet steel weld in which two overlapping steel sheets (2, 4; 10, 13; 18, 19; 21, 23, 26) are placed with their respective end portions in overlapping relationships comprising two overlapping steel sheets (2, 4; 10, 13; 18, 19; 21, 23, 26); a coating of corrosion-resistant metal (1, 3) at adjacent, overlapping surfaces of said sheets; a resistance weld seam (8, 14, 38, 22) formed at the interface of said sheets at least in the regions of the overlap of said projections and the other sheet; and means providing for localized current density upon welding comprising openings (5, 11, 20, 24) formed in at least the end portions of at least one of the steel sheets extending from adjacent the outer edge of the end portion inwardly in said end portion leaving projections (6, 15, 25) between said openings, said openings having a depth less than the extent of overlap of said sheets.
Claim 3
Dependent Claim
17 words
Weld seam according to claim 1, wherein the weld extends slightly beyond the roots of the openings.
Claim 4
Dependent Claim
20 words
Weld according to claim 2, wherein the region of overlap is slightly greater than the maximum depth of the openings.
Claim 5
Dependent Claim
24 words
Weld according to claim 1, wherein the openings and hence the projections are uniformly spaced along the edge of said at least one sheet.
Claim 6
Dependent Claim
23 words
Weld according to claim 1, wherein the openings are open notches (5, 20, 24) and the projections are projecting teeth (6, 15, 25).
Claim 7
Dependent Claim
40 words
Weld according to claim 1, wherein the openings are holes (11) formed in the sheet leaving a continuous edge (10") joining the projections (10a) between the holes (11) in the region adjacent the terminal edge (10') of the sheet (10).
Claim 8
Dependent Claim
62 words
Weld according to claim 1, wherein the two steel sheets are the end portions (23, 26) of a single strip bent end-to-end to form a tubular structure; said coating of corrosion resistant metal comprises a zinc coating applied to at least one of the surfaces of said strip; and wherein the weld seam (8, 38, 22) extends longitudinally of the tubular structure.
Claim 9
Dependent Claim
64 words
Weld according to claim 1, wherein (FIGS. 1, 2) the openings are open notches (5) and the projections are projecting teeth (6), said teeth are wider at their root portions than at their free portions, and merge with the respective steel sheet at a curved portion to shape the notches between the projections to have a maximum radius of curvature at their root ends.
Claim 10
Dependent Claim
36 words
Weld according to claim 1, wherein the projections (15, 25) are formed with essentially parallel flanks and the root portions of the openings have a radius of curvature which is half the distance between the projections.
Claim 11
Dependent Claim
42 words
Weld according to claim 1, wherein the openings are open notches (20) and the projections are projecting teeth (15), the projecting teeth having parallel flanks (16) arranged at an angle (α) with respect to the side edges (17) of the steel sheets.
Claim 12
Dependent Claim
26 words
Weld according to claim 1, wherein said coating of corrosion-resistant metal comprises a zinc coating applied to at least one of the surfaces of said sheets.
Claim 13
Dependent Claim
67 words
Weld according to claim 11, wherein the openings are open notches (5, 20, 24) and the projections are projecting teeth (6, 15, 25), the openings and projections being essentially uniformly spaced along the edge of said at least one sheet; and wherein the seam extends slightly beyond the roots of the openings and the region of overlap is slightly greater than the maximum depth of the openings.
Claim 14
Dependent Claim
82 words
Weld according to claim 11, wherein the openings are holes (11) essentially uniformly spaced along the edge of said at least one sheet and formed in the sheet leaving a continuous edge (10") joining the projections (10a) between the holes (11) in the region adjacent the terminal edge (10' ) of the sheet (10); and wherein the weld seam extends slightly beyond the roots of the openings and the region of overlap is slightly greater than the maximum depth of the openings.
References Cited (Backward Citations)
US3510624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |