Patent US4119828A successfully refreshed from Google Patents.
US4119828A
Expired / Lapsed
US
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Method of plasma multiarc welding by permanently burning direct-current arcs
Assignee: VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY PROEKTNO-KONSTRUKTORSKY I TEKHNOLOGICHESKY INSTITUT ELEKTROSVAROCHNOGO OBORUDOVANIA
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Filing: 1977-02-08
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Granted: 1978-10-10
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Expires: 1997-02-08
Abstract
Abstract A method of plasma multiarc welding by permanently burning direct-current arcs of different polarities makes use of a plasma forming gas and shielding mediums and the arcs are located so that the adjacent arcs have opposite polarities, consisting, according to the invention, in that all arcs are started between nonconsumable electrodes and a workpiece or some arcs are started between nonconsumable electrodes and a workpiece and other arcs are started between consumable electrodes and a workpiece, the currents of all arcs and the distance between the arcs being set so that the ratio of the product of the currents of two adjacent arcs to the distance therebetween is equal or more than 6.10 3 A 2 /cm.
Inventors
- 👤 David Grigorievich Bykhovsky
- 👤 Arkady Leonidovich Bolotnikov
- 👤 Gennady Egorovich Strepetov
- 👤 Alexandr Ivanovich Danilov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:24
CPC Classifications
B; B23; B23K; B23K10/00; B23K10/02; B23K35/00; B23K35/22; B23K35/38; B23K35/383
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
180 words
A method of plasma multiarc welding using a common weld pool by permanently burning direct-current arcs of different polarities comprising positioning at least three electrodes adjacent to each other, each of said electrodes being nonconsumable, positioning a workpiece to be welded in spaced relation to said three electrodes, providing a plasma-forming gas and a shielding medium to the space between said three electrodes and said workpiece, providing a direct-current power source across each of said three electrodes and said workpiece simultaneously to create at least three electric arcs, each arc being between one of said three electrodes and the workpiece such that the polarity of each arc is selected to be of straight polarity or of reversed polarity so that the arcs adjacent one another have opposite polarities, wherein the three electrodes positioned adjacent to each other and the direct-current power source provided to said electrodes are set so that the ratio of the product of the currents of two adjacent arcs to the distance between said arcs is greater than or equal to 9.5·10 4 amps squared per centimeter.
Claim 2
Independent Claim
180 words
A method of plasma multiarc welding using a common weld pool by permanently burning direct-current arcs of different polarities comprising positioning at least three electrodes adjacent to each other, each of said electrodes being nonconsumable, positioning a workpiece to be welded in spaced relation to said three electrodes, providing a plasma-forming gas and a shielding medium to the space between said three electrodes and said workpiece, providing a direct-current power source across each of said three electrodes and said workpiece simultaneously to create at least three electric arcs, each arc being between one of said three electrodes and the workpiece such that the polarity of each arc is selected to be of straight polarity or of reversed polarity so that the arcs adjacent one another have opposite polarities, wherein the three electrodes positioned adjacent to each other and the direct-current power source provided to said electrodes are set so that the ratio of the product of the currents of two adjacent arcs to the distance between said arcs is greater than or equal to 9.5·10 4 amps squared per centimeter.
Claim 3
Independent Claim
201 words
A method of plasma multiarc welding using a common weld pool by permanently burning direct-current arcs of different polarities comprising positioning at least three electrodes adjacent to each other, each of said electrodes being alternating consumable and nonconsumable, positioning a workpiece to be welded in spaced relation to said three electrodes, providing a plasma-forming gas and a shielding medium to the space between said three electrodes and said workpiece, providing a direct-current power source across each of said three electrodes and said workpiece simultaneously to create at least three electric arcs, each arc being between one of said three electrodes and the workpiece such that the polarity of each arc is selected to be of straight polarity or of reversed polarity so that the arcs adjacent one another have opposite polarities, and such that all consumable electrodes have the same polarity and all nonconsumable electrodes have the opposite polarity, wherein the three electrodes positioned adjacent to each other and the direct-current power source provided to said electrodes are set so that the ratio of the product of the currents of two adjacent arcs to the distance between said arcs is greater than or equal to 9.5·10 4 amps squared per centimeter.
Claim 4
Independent Claim
201 words
A method of plasma multiarc welding using a common weld pool by permanently burning direct-current arcs of different polarities comprising positioning at least three electrodes adjacent to each other, each of said electrodes being alternating consumable and nonconsumable, positioning a workpiece to be welded in spaced relation to said three electrodes, providing a plasma-forming gas and a shielding medium to the space between said three electrodes and said workpiece, providing a direct-current power source across each of said three electrodes and said workpiece simultaneously to create at least three electric arcs, each arc being between one of said three electrodes and the workpiece such that the polarity of each arc is selected to be of straight polarity or of reversed polarity so that the arcs adjacent one another have opposite polarities, and such that all consumable electrodes have the same polarity and all nonconsumable electrodes have the opposite polarity, wherein the three electrodes positioned adjacent to each other and the direct-current power source provided to said electrodes are set so that the ratio of the product of the currents of two adjacent arcs to the distance between said arcs is greater than or equal to 9.5·10 4 amps squared per centimeter.
Claim 5
Dependent Claim
36 words
A method of welding low-alloy steels as claimed in claim 1, wherein carbon dioxide is used as the plasma-forming and shielding gas for the straight polarity arcs and argon is used for the reversed polarity arcs.
Claim 6
Dependent Claim
44 words
A method of welding low-alloy steel as claimed in claim 1, wherein a mixture CO 2 +O 2 is used as the plasma-forming gas for the straight polarity arcs, CO 2 is used in the shielding medium and argon for the reversed polarity arcs.
Claim 7
Dependent Claim
41 words
A method of welding stainless steels as claimed in claim 1, wherein a mixture Ar+H 2 is used as the plasma-forming gas for the straight polarity arcs and argon is used for the reversed polarity arcs and in the shielding medium.
Claim 8
Dependent Claim
42 words
A method of welding stainless steels as claimed in claim 1, wherein CO 2 is used as the plasma-forming gas for the straight polarity arcs, argon is used for the reversed polarity arcs and CO 2 is used in the shielding medium.
Claim 9
Dependent Claim
44 words
A method of welding low-alloys and stainless steels as claimed in claim 1, wherein CO 2 is used as the plasma-forming gas for the straight polarity arcs, argon is used for the reversed polarity arcs and a flux is used as the shielding medium.
Claim 10
Dependent Claim
38 words
A method of welding copper as claimed in claim 1, wherein N 2 is used as the plasma-forming gas for the straight polarity arcs and in the shielding medium and argon is used for the reversed polarity arcs.
Claim 11
Dependent Claim
37 words
A method of welding copper and aluminum as claimed in claim 1, wherein a mixture Ar+He is used for the straight and reversed polarity arcs as the plasma-forming gas and argon is used in the shielding medium.
Claim 12
Dependent Claim
38 words
A method of welding copper and aluminum as claimed in claim 1, wherein a mixture Ar+He is used as the plasma-forming gas for the straight and reversed polarity arcs and a flux is used in the shielding medium.
Claim 13
Dependent Claim
41 words
A method of welding aluminum as claimed in claim 1, wherein a mixture Ar+O 2 is used as the plasma-forming gas for the straight polarity arcs, and wherein argon is used for the reversed polarity arcs and in the shielding medium.
Claim 14
Dependent Claim
37 words
A method of welding aluminum as claimed in claim 1, wherein argon is used as the plasma-forming gas for the straight and reversed polarity arcs, and wherein argon and a flux are used as the shielding medium.
Claim 15
Dependent Claim
32 words
A method of welding low-alloy steels as claimed in claim 2, wherein CO 2 is used in the shielding medium and as the plasma-forming gas for consumable and nonconsumable straight polarity electrodes.
Claim 16
Dependent Claim
45 words
A method of welding low-alloy steels as claimed in claim 2, wherein a mixture CO 2 +O 2 is used as the plasma-forming gas for the straight polarity arcs and CO 2 is used in the shielding medium when consumable reversed polarity electrodes are employed.
Claim 17
Dependent Claim
47 words
A method of welding stainless steels as claimed in claim 2, wherein a mixture Ar+H 2 is used as the plasma-forming gas for the straight polarity arcs and argon is used in the shielding medium when consumable reversed polarity electrodes and nonconsumable straight polarity electrodes are employed.
Claim 18
Dependent Claim
42 words
A method of welding stainless steels as claimed in claim 2, wherein CO 2 is used as the plasma-forming gas for the straight polarity arcs and in the shielding medium when consumable reversed polarity electrodes and nonconsumable straight polarity electrodes are employed.
Claim 19
Dependent Claim
48 words
A method of welding stainless and low-alloy steels as claimed in claim 2, wherein CO 2 is used as the plasma-forming gas for the straight polarity arcs and a flux is used in the shielding medium when consumable reversed polarity electrodes and nonconsumable straight polarity electrodes are employed.
Claim 20
Dependent Claim
41 words
A method of welding copper as claimed in claim 2, wherein N 2 is used as the plasma-forming gas for the straight polarity arcs and in the shielding medium when consumable reversed polarity electrodes and nonconsumable straight polarity electrodes are employed.
Claim 21
Dependent Claim
45 words
A method of welding copper as claimed in claim 2, wherein a mixture Ar+He is used as the plasma-forming gas for the straight polarity arcs and argon is used in the shielding medium when consumable reversed polarity electrodes and nonconsumable straight polarity electrodes are employed.
Claim 22
Dependent Claim
46 words
A method of welding copper as claimed in claim 2, wherein a mixture Ar+He is used as the plasma-forming gas for the straight polarity arcs and a flux is used in the shielding medium when consumable reversed polarity electrodes and nonconsumable straight polarity electrodes are employed.
Claim 23
Dependent Claim
55 words
A method of plasma multiarc welding as claimed in claim 2, wherein the workpiece to be welded is aluminum and wherein a mixture Ar+He is used as the plasma-forming gas for the reversed polarity arcs and argon is used in the shielding medium when consumable straight polarity electrodes and nonconsumable reversed polarity electrodes are employed.
Claim 24
Dependent Claim
56 words
A method of plasma multiarc welding as claimed in claim 2, wherein the workpiece to be welded is aluminum and wherein argon is used as the plasma-forming gas for the reversed polarity arcs and a mixture Ar+O 2 is used in the shilding medium when consumable straight polarity electrodes and nonconsumable reversed polarity electrodes are employed.
Claim 25
Dependent Claim
56 words
A method of plasma multiarc welding as claimed in claim 2, wherein the workpiece to be welded is aluminum and wherein a mixture Ar+He is used as the plasma-forming gas for the reversed polarity arcs and a flux is used in the shielding medium when consumable straight polarity electrodes and nonconsumable reversed polarity electrodes are employed.
Claim 26
Dependent Claim
57 words
A method of plasma multiarc welding as claimed in claim 2, wherein the workpiece to be welded is aluminum and wherein argon is used as the plasma-forming gas for the reversed polarity arcs and wherein argon and a flux is used as the shielding gas when consumable straight polarity electrodes and nonconsumable reversed polarity electrodes are employed.
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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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |