US3649805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma generating method and means
Assignee: ADVANCED ROBOTICS Corp
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Filing: 1970-04-29
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Granted: 1972-03-14
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Expires: 1990-04-29
Abstract
Abstract An inert gas welding torch is used to create plasma by directing one or more discrete high velocity jet gas streams into a welding arc between the electrode and the workpiece. The plasma stream is controllable with regard to energy content or location by varying the amount or direction of the inert gas flow. The plasma stream is insensitive to variations of arc length, and permits abnormally high current densities in the electrode. When used with consumable electrodes, the invention is useful for casting as well as for deep welding heavy plate materials in a single pass.
Inventors
- 👤 Roderick Rohrberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:30
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/341; B; B22; B22D; B22D23/00; B22D23/06; B22D23/10; B23; B23K; B23K10/00; B23K10/02; H05H1/3463; H05H1/3421; H05H1/3478
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
126 words
A method of progressively welding together two workpiece components by a series of heat passes by a welding torch, said method comprising: striking an arc between a welding electrode and at least one of said workpiece components, forcefully directing at least one jet stream of ionizable gas at a predetermined flow rate into said arc at a point external to said welding torch along a path angularly disposed to the direction of current flow in said arc, moving said electrode relative to said workpiece components along a welding path in a first welding pass, and reducing the flow rate of said jet stream and the amplitude of current in said arc whereby welding heat is applied by said arc for at least one subsequent welding pass.
Claim 2
Independent Claim
126 words
A method of progressively welding together two workpiece components by a series of heat passes by a welding torch, said method comprising: striking an arc between a welding electrode and at least one of said workpiece components, forcefully directing at least one jet stream of ionizable gas at a predetermined flow rate into said arc at a point external to said welding torch along a path angularly disposed to the direction of current flow in said arc, moving said electrode relative to said workpiece components along a welding path in a first welding pass, and reducing the flow rate of said jet stream and the amplitude of current in said arc whereby welding heat is applied by said arc for at least one subsequent welding pass.
Claim 3
Independent Claim
68 words
A method for joining at least two confronting workpiece portions together, comprising: arranging said two portions in desired final relationship and with a space gap therebetween, inserting a consumable welding electrode wire entirely through said gap, applying electrical current to said electrode and said portions to produce an arc therebetween, and forcefully directing at least one jet stream of ionizable gas into said arc to penetrate the same.
Claim 4
Independent Claim
68 words
A method for joining at least two confronting workpiece portions together, comprising: arranging said two portions in desired final relationship and with a space gap therebetween, inserting a consumable welding electrode wire entirely through said gap, applying electrical current to said electrode and said portions to produce an arc therebetween, and forcefully directing at least one jet stream of ionizable gas into said arc to penetrate the same.
Claim 5
Dependent Claim
31 words
The method set forth in claim 2 above, further including: simultaneously moving said electrode along said gap and feeding additional electrode wire into said arc during said current and gas flow.
Claim 6
Dependent Claim
39 words
The method set forth in claim 2 above, wherein: a plurality of discrete jet streams of said gas are directed toward said arc in a conical pattern untIl said streams enter said gap and form a single unitary stream.
Claim 7
Dependent Claim
28 words
The method set forth in claim 4 above, wherein: the total cross-sectional area of all said jet streams combined substantially equals the cross-sectional area of said unitary stream.
Claim 8
Independent Claim
82 words
A method of joining together at least two workpiece portions, comprising: forming a hole in one of said portions, contacting said one portion with the other of said two portions at the location of said hole, inserting a consumable welding electrode within said hole, applying electrical current to said electrode and at least one of said workpiece portions to create an arc, and directing at least one stream of ionizable gas into said hole with a force sufficient to penetrate said arc.
Claim 9
Independent Claim
82 words
A method of joining together at least two workpiece portions, comprising: forming a hole in one of said portions, contacting said one portion with the other of said two portions at the location of said hole, inserting a consumable welding electrode within said hole, applying electrical current to said electrode and at least one of said workpiece portions to create an arc, and directing at least one stream of ionizable gas into said hole with a force sufficient to penetrate said arc.
Claim 10
Dependent Claim
26 words
The method set forth in claim 6 above, wherein: said ionizable gas is directed toward said hole in a plurality of discrete streams surrounding said electrode.
Claim 11
Independent Claim
87 words
A method of joining together at least two workpiece portions, comprising: forming a hole in each of said two portions, placing said portions in desired final relationship with said two holes in substantially continuous and coaxial alignment, inserting a consumable welding electrode through said holes, applying electrical current to said electrode and said workpiece portions to cause an arc between said electrode and both of said portions, and directing at least one stream of ionizable gas into said holes with a force sufficient to penetrate said arc.
Claim 12
Independent Claim
87 words
A method of joining together at least two workpiece portions, comprising: forming a hole in each of said two portions, placing said portions in desired final relationship with said two holes in substantially continuous and coaxial alignment, inserting a consumable welding electrode through said holes, applying electrical current to said electrode and said workpiece portions to cause an arc between said electrode and both of said portions, and directing at least one stream of ionizable gas into said holes with a force sufficient to penetrate said arc.
Claim 13
Independent Claim
83 words
A method of welding two relatively thick workpiece elements together between two confronting surfaces thereof, consisting of: positioning said two elements in desired final relationship with a gap between said two surfaces, positioning a welding electrode portion between said two surfaces and extending substantially through said gap, applying an electric current to said electrode and at least one of said two elements to cause arcing along said electrode portion, and simultaneously flowing a stream of inert gas through said arc and said gap.
Claim 14
Independent Claim
83 words
A method of welding two relatively thick workpiece elements together between two confronting surfaces thereof, consisting of: positioning said two elements in desired final relationship with a gap between said two surfaces, positioning a welding electrode portion between said two surfaces and extending substantially through said gap, applying an electric current to said electrode and at least one of said two elements to cause arcing along said electrode portion, and simultaneously flowing a stream of inert gas through said arc and said gap.
Claim 15
Dependent Claim
41 words
The method set forth in claim 9 above, further including: feeding additional welding electrode into said gap during said arcing, and simultaneously translationally moving said electrode along a welding path defined by said gap to progressively fuse said two elements together.
References Cited (Backward Citations)
US3324278A
Cited
US3484575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |