US3597583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Consumable welding electrode
Assignee: Duria Werk Karl Kempf GmbH
•
Filing: 1969-08-19
•
Granted: 1971-08-03
•
Expires: 1989-08-19
Abstract
Abstract A consumable welding electrode for making welded joints which are resistant to rusting, acid attack and heat comprises a core rod which contains alloy-producing components and a sheath which contains both alloy-producing components and flux-producing components. The proportions of the alloy-producing components in the sheath and those in the core rod are such that when the electrode is used, the core rod and the sheath deposit alloys which have substantially the same compositions. To achieve this effect, the proportions of the alloy components in the sheath must be adjusted relatively to those in the core rod to allow for the fact that the sheath is consumed more rapidly than the core rod as it is made of powdered components whereas the core rod is of solid metal. With the constituents of the core rod and of the sheath adjusted in this way, the weld produced by the electrode will have a uniform composition so that no underalloyed corrosion-sensitive spots can occur.
Inventors
- 👤 Hans Joachim Hulsewig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:20
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/308; B23K35/3086; B23K35/36; B23K35/365
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
In a consumable welding electrode for making welded joints which are resistant to rusting, acid attack and heat, wherein said electrode comprises a core rod and a sheath surrounding said core rod, said core rod containing alloy-producing components and said sheath containing alloy-producing components and fluxproducing components, the improvement which comprises that said alloy-producing components in said sheath and said alloyproducing components in said core rod are present in such proportions relative to each other that-considering the different consumption rates of the alloy-producing components in said sheath and said core rod-when said electrode is used and said sheath and said core rod are consumed, said core rod and said sheath deposit alloys which have substantially the same compositions.
Claim 2
Dependent Claim
118 words
In a consumable welding electrode for making welded joints which are resistant to rusting, acid attack and heat, wherein said electrode comprises a core rod and a sheath surrounding said core rod, said core rod containing alloy-producing components and said sheath containing alloy-producing components and fluxproducing components, the improvement which comprises that said alloy-producing components in said sheath and said alloyproducing components in said core rod are present in such proportions relative to each other that-considering the different consumption rates of the alloy-producing components in said sheath and said core rod-when said electrode is used and said sheath and said core rod are consumed, said core rod and said sheath deposit alloys which have substantially the same compositions.
Claim 3
Dependent Claim
45 words
An electrode as claimed in claim 1, wherein said core rod comprises an austenitic steel including from about 17 percent to 20 percent chromium and from about 8 percent to about 14 percent nickel by weight and said sheath also includes chromium, nickel and iron.
Claim 4
Dependent Claim
43 words
An electrode as claimed in claim 2, wherein said core rod also includes up to about 5 percent molybdenum and up to about 1 percent niobium-tantalum by weight and said sheath also includes components selected from the group consisting of molybdenum and niobium-tantalum.
Claim 5
Dependent Claim
39 words
An electrode as claimed in claim 1, wherein said core rod and said sheath are cylindrical, said sheath having an outside diameter from about two to about two and a half times greater than that of said core rod.
Claim 6
Dependent Claim
103 words
An electrode as claimed in claim 1, wherein said sheath includes from about 10 percent to about 30 percent ferrochromium, up to about 15 percent nickel powder, from about 20 percent to about 40 percent iron powder, from 0 percent to about 5 percent ferromanganese, from 0 percent to about 10 percent ferromolybdenum, from 0 percent to about 3 percent ferroniobium-tantalum, from about 10 percent to about 20 percent titanium dioxide, from about 2 percent to about 10 percent calcium carbonate, from 0 percent to about 10 percent fluorspar, from about 7 percent to about 22 percent silicate by weight and a binder.
Claim 7
Dependent Claim
129 words
In a consumable welding electrode for making welded joints which are resistant to rusting, acid attack and heat, wherein said electrode comprises a core rod and a sheath surrounding said core rod, said core rod containing alloy-producing components and said sheath containing alloy-producing components and flux-producing components, the improvement which comprises that said sheath is made of powdered material while said core rod is a solid body, said sheath and said core rod containing substantially the same alloy-producing components, the relative proportions of said alloy-producing components in said sheath and said core rod being adapted to the different consumption rates of said powder-containing sheath and said solid core rod body so that said sheath and said core rod body upon consumption deposit alloys that have substantially the same composition.
Claim 8
Dependent Claim
129 words
In a consumable welding electrode for making welded joints which are resistant to rusting, acid attack and heat, wherein said electrode comprises a core rod and a sheath surrounding said core rod, said core rod containing alloy-producing components and said sheath containing alloy-producing components and flux-producing components, the improvement which comprises that said sheath is made of powdered material while said core rod is a solid body, said sheath and said core rod containing substantially the same alloy-producing components, the relative proportions of said alloy-producing components in said sheath and said core rod being adapted to the different consumption rates of said powder-containing sheath and said solid core rod body so that said sheath and said core rod body upon consumption deposit alloys that have substantially the same composition.
Claim 9
Dependent Claim
48 words
An electrode as claimed in claim 6, wherein said alloy-producing components comprise at least one metal that is easily oxidized under the conditions of welding, said sheath containing a larger proportion of said metal than said core rod to allow for a faster consumption rate of said sheath.
Claim 10
Dependent Claim
12 words
An electrode as claimed in claim 7, wherein said metal is chromium.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |