US3854028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed vertical electro-slag welding
Assignee: ESAB AB
•
Filing: 1973-09-18
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Granted: 1974-12-10
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Expires: 1993-09-18
Abstract
Abstract A process for electroslag welding in the vertical direction at high speeds, comprising, controlling the temperature of the molding shoes such that less than 35 per cent of the solidified weld surface area is covered by a patch network of solidified slag and by using a wire extension of increased length.
Inventors
- 👤 G Uttrachi
- 👤 D Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:52
CPC Classifications
B; B23; B23K; B23K25/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
197 words
A method of welding workpieces, having thicknesses of between 3/8 to 2 inches, in a substantially vertical direction, under a blanket of a molten conductive slag, at high speed, comprising the steps of: a. forming a substantially vertical joint between the edges of the workpieces to be welded; b. surrounding said joint at a predetermined starting location with means to form a cavity; c. depositing a granular flux into said cavity; d. submerging the end of a consumable filler wire electrode beneath the surface of said deposit of granular flux; e. initially establishing an electric arc under said deposite of flux for forming said molten slag within said cavity; f. passing a current of above about 500 amperes through said electrode; g. advancing said cavity forming means vertically upstream from said starting location at a speed of between 3-10 inches per minute while continuously feeding said electrode into said molten slag; and h. controllably cooling said cavity forming means so as to form a substantially discontinuous solidified slag cover upon the surface of the solidified weld metal which represents no more than 35 percent of the total solidified weld surface area per linear foot of weld length.
Claim 2
Independent Claim
197 words
A method of welding workpieces, having thicknesses of between 3/8 to 2 inches, in a substantially vertical direction, under a blanket of a molten conductive slag, at high speed, comprising the steps of: a. forming a substantially vertical joint between the edges of the workpieces to be welded; b. surrounding said joint at a predetermined starting location with means to form a cavity; c. depositing a granular flux into said cavity; d. submerging the end of a consumable filler wire electrode beneath the surface of said deposit of granular flux; e. initially establishing an electric arc under said deposite of flux for forming said molten slag within said cavity; f. passing a current of above about 500 amperes through said electrode; g. advancing said cavity forming means vertically upstream from said starting location at a speed of between 3-10 inches per minute while continuously feeding said electrode into said molten slag; and h. controllably cooling said cavity forming means so as to form a substantially discontinuous solidified slag cover upon the surface of the solidified weld metal which represents no more than 35 percent of the total solidified weld surface area per linear foot of weld length.
Claim 3
Dependent Claim
36 words
A method of welding as defined in claim 1 further comprising the step of maintaining an electrode extension of above about 2 inches for a tubular filler wire electrode having a diameter of about 3/32 inches.
Claim 4
Dependent Claim
34 words
A method of welding as defined in claim 2 wherein said tubular filler wire electrode has a total weight composition comprising less than .12% carbon; about 2% manganese; about .35% silicon and balance iron.
Claim 5
Dependent Claim
26 words
A method as defined in claim 3 wherein said slag cover represents between 5-25% of the total solidified weld surface area per linear foot of length.
Claim 6
Dependent Claim
15 words
A method as defined in claim 1 wherein said consumable filler wire electrode is solid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |