US3575574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of backing strip removal
Assignee: ESAB AB
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Filing: 1969-07-07
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Granted: 1971-04-20
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Expires: 1989-07-07
Abstract
Abstract A method of making a butt weld between sheet steel members having a thickness of 0.2 in. or more, comprising the steps of welding the sheet steel members from one side only by the consumable-electrode arc welding process with the aid of a backing strip of steel which is welded on to but not fused through the welding operation, said backing strip having a thickness not less than 0.08 in., and subsequently removing the steel backing strip by a flame machining operation.
Inventors
- 👤 Goran Folke Almqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:24
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/02; B23K9/035
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
214 words
A method of producing and finishing a butt weld between a pair of heavy sheet steel members comprising the steps of disposing said sheet steel members with adjacent edges forming a butt joint, applying a steel backing strip having a thickness not less than 2 mm. (0.08 in.) against the underside of both of said sheet steel members along said butt joint, welding together the edges of said butt joint and a medial portion of said backing strip by arc welding with at least one fusible electrode supplied from above and advanced along said butt joint, adjusting the welding conditions so that the fusion zone in said backing strip has a depth less than the thickness of said backing strip and a width less than the width of said backing strip, whereby edge zones of said backing strip are not welded to said sheet steel members, and thermochemically removing said edge zones of said backing strip and at least the major portion of said medial portion of said backing strip between said edge zones by a stream of cutting oxygen discharged from a nozzle advanced along said backing strip, said nozzle being at an acute angle to said backing strip whereby the stream of cutting oxygen engages said backing strip ahead of said nozzle.
Claim 2
Independent Claim
214 words
A method of producing and finishing a butt weld between a pair of heavy sheet steel members comprising the steps of disposing said sheet steel members with adjacent edges forming a butt joint, applying a steel backing strip having a thickness not less than 2 mm. (0.08 in.) against the underside of both of said sheet steel members along said butt joint, welding together the edges of said butt joint and a medial portion of said backing strip by arc welding with at least one fusible electrode supplied from above and advanced along said butt joint, adjusting the welding conditions so that the fusion zone in said backing strip has a depth less than the thickness of said backing strip and a width less than the width of said backing strip, whereby edge zones of said backing strip are not welded to said sheet steel members, and thermochemically removing said edge zones of said backing strip and at least the major portion of said medial portion of said backing strip between said edge zones by a stream of cutting oxygen discharged from a nozzle advanced along said backing strip, said nozzle being at an acute angle to said backing strip whereby the stream of cutting oxygen engages said backing strip ahead of said nozzle.
Claim 3
Dependent Claim
38 words
A method as claimed in claim 1 including the step of adjusting the stream of oxygen to retain a small portion of the medial portion of the backing strip between said edge zones to form a low ridge.
Claim 4
Dependent Claim
24 words
A method as claimed in claim 1, the step of thermochemical removal consisting of a single pass of said nozzle along said backing strip.
References Cited (Backward Citations)
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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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |