Patent US3644697A successfully refreshed from Google Patents.
US3644697A
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Protective gas for arc welding
Assignee: Individual
•
Filing: 1969-04-21
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Granted: 1972-02-22
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Expires: 1989-04-21
Abstract
Abstract A protective gas for the arc welding of materials such as highalloyed ferritic chrome steel, austenitic chrome-nickel steel and chrome-nickel-molybdenum steel includes a mixture of argon and nitrogen with the nitrogen content being 1 to 20 percent and preferably 5 to 10 percent by volume. An addition of more than trace amounts and up to 10 percent by volume of oxygen is also proposed. An advantageous form of the gas contains 5 percent by volume of nitrogen and 3 percent by volume of oxygen.
Inventors
- 👤 Alfred Krahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:27
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/38; B23K35/383
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
In the gas of claim 1 wherein said mixture contains 5 percent by volume of nitrogen and 3 percent by volume of oxygen.
Claim 2
Dependent Claim
66 words
In a process for obtaining a high-quality welding seam in the arc welding of metals selected from the group consisting of high-alloyed ferritic chrome steel, austenitic chrome-nickel steel, and chrome-nickel-molybdenum steel with the utilization of a protective gas, the improvement comprising the protective gas consisting of a mixture of argon and nitrogen with the nitrogen content being from 1 to less than 10 percent by volume.
Claim 3
Dependent Claim
18 words
In the process of claim 3 wherein the nitrogen content is from 5 to 10 percent by volume.
Claim 4
Dependent Claim
77 words
In a process for the arc welding of metals selected from the group consisting of high-alloyed ferritic chrome steel, austenitic chrome-nickel steel, and chrome-nickel-molybodenum steel with the utilization of a protective gas, the improvement comprising the protective gas consisting of a mixture of argon and nitrogen and oxygen with the nitrogen being from 1 to 20 percent by volume of the mixture and the oxygen being from more than trace amounts up to 10 percent by volume.
Claim 5
Dependent Claim
15 words
In the process of claim 5 wherein the oxygen is about 3 percent by volume.
Claim 6
Dependent Claim
75 words
In a process for the arc welding of metals selected from the group consisting of high-alloyed ferritic chrome steel, austenitic chrome-nickel steel, and chrome-nickel-molybdenum steel with the utilization of a protective gas, the improvement comprising the protEctive gas consisting of a mixture of argon and nitrogen and oxygen, the nitrogen content being from 5 to 10 percent by volume, and the oxygen content being more than trace amount and up to 10 percent by volume.
Claim 7
Dependent Claim
23 words
In the process of claim 7 wherein said mixture contains 5 percent by volume of nitrogen and 3 percent by volume of oxygen.
Claim 8
Dependent Claim
31 words
In the process of claim 7 including determining the content of the mixture constituents in accordance with the content of nitride constituents and deoxidizing elements in the material to be welded.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |