EP0195409A2
Expired / Lapsed
EP
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Plasma transfer welded arc torch
Assignee: UNITED OVERLAY SYSTEMS
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Filing: 1986-03-18
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Granted: —
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Expires: 2006-03-18
Abstract
Abstract @ A plasma arch torch having an upper body of a non-conductive material supporting an electrode and a lower body of a conductive material supporting a nozzle through which an arc is formed between the electrode and a work piece. A mixture of inert gas and a fusible powder may be blown through a passageway formed in said lower body and through passages formed in said nozzle onto the work piece. A liquid coolant is circulated through a reservoir formed in . the lower body, and an inert gas is discharged through an opening that circumvallates the nozzle. Both the nozzle and the torch as a whole are uniquely constructed to avoid many of the problems caused by the use of insulators and fluid seals. In addition, the novelty of construction enhances performance.
Inventors
- 👤 Andrew D. Cusimano
- 👤 Danny W. Humes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 17:08
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/28; B; B05; B05B; B05B7/00; B05B7/16; B05B7/22; B05B7/222; B05B7/226; B23; B23K; B23K9/00; B23K9/24; B23K9/28; B23K9/285; H05H1/32; H05H1/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
174 words
A plasma arc torch having upper (20) and lower (21) body members formed with coaxial passages, an electrode (23) supported from said upper body member and within said coaxial passages (50), and a nozzle having an axial arc port (50) through which an arc is formed between the electrode and a work piece, and characterized in that said lower body member comprises an outer metallic shell (21a) and an inner metallic sleeve (21b) which define a coolant reservoir {33) therebetween, said shell and sleeve having complementary annular upper and lower mating edges (31, 32), said upper edges and lower edges being welded together, respectively, to. seal the reservoir top and bottom; said outer shell having a plurality of passageways formed therein including at least one passageway (34, 35) for connecting the coolant reservoir with an external source of coolant, a second passageway (36) for connecting a pressurized mixture of powder and inert gas with said nozzle, and a third passageway (41) for connecting a shield gas with an annular discharge that encircles the nozzle.
Claim 2
Dependent Claim
174 words
A plasma arc torch having upper (20) and lower (21) body members formed with coaxial passages, an electrode (23) supported from said upper body member and within said coaxial passages (50), and a nozzle having an axial arc port (50) through which an arc is formed between the electrode and a work piece, and characterized in that said lower body member comprises an outer metallic shell (21a) and an inner metallic sleeve (21b) which define a coolant reservoir {33) therebetween, said shell and sleeve having complementary annular upper and lower mating edges (31, 32), said upper edges and lower edges being welded together, respectively, to. seal the reservoir top and bottom; said outer shell having a plurality of passageways formed therein including at least one passageway (34, 35) for connecting the coolant reservoir with an external source of coolant, a second passageway (36) for connecting a pressurized mixture of powder and inert gas with said nozzle, and a third passageway (41) for connecting a shield gas with an annular discharge that encircles the nozzle.
Claim 3
Dependent Claim
120 words
The plasma arc torch of claim 1, further characterized in that the lower end of said inner- metallic sleeve being internally threaded, said nozzle having a powder-gas discharge plate (29) supported on a tubular stem (29b) threadably engaged with the lower end of said sleeve, said powder-gas discharge plate having a plurality of passages (49) extending from an upper face to a lower face, said passages being angularly directed, convergent and circumferentially spaced around the axial arc port of said nozzle; and an annular plenum (52) defined between the upper face of said powder-gas discharge plate and the lower end of said outer metallic shell, said annular plenum being in communication with the second passageway and the plurality of. passages.
Claim 4
Dependent Claim
50 words
The plasma arc torch of claim 2, wherein the upper face of said powder-gas discharge plate is formed with an annular groove, the ends of the plurality of passages formed in said plate terminate. within said groove, and said groove defines one portion of the plenum for a powder-gas mixture.
Claim 5
Dependent Claim
41 words
The plasma arc torch of claim 1, wherein said outer metallic shell has an upper annular flange, said third passageway is formed through said flange interconnecting a radial inlet port with a discharge port formed in the underside of said flange.
Claim 6
Dependent Claim
46 words
The plasma arc torch of claim 1, wherein said upper body member comprises a machinable, electrical insulating material; and further comprising an electrically conductive holder threadably mounted to said upper body member for. supporting said electrode in space relation to said lower body member and nozzle.
Claim 7
Dependent Claim
19 words
The plasma arc torch of claim 5, further comprising means supported upon said upper body for cooling said electrode.
Claim 8
Dependent Claim
24 words
The plasma arc torch of claim 2, wherein the lower . end of said lower body is dished to. receive the powder-gas discharge plate.
Claim 9
Dependent Claim
161 words
A plasma arc torch having upper and lower body members formed with coaxial passages, an electrode supported from said upper body member and within said coaxial passages, and a nozzle supported from the lower.end of said lower body member, said nozzle having an axial passage through which an arc is formed between the electrode and a work piece, and characterized in that said lower body member and nozzle define an annular plenum; said lower body member being formed with a passageway for connecting a pressurized mixture of powder and inert gas with said annular plenum; said nozzle having a plurality of passages in open communication with said annular plenum, each passage being angularly directed and convergent with respect to the axial passage and circumferentially spaced around said axial passage whereby a pressurized mixture of powder and inert gas is passed through said lower body member into the annular plenum and convergently directed through the plurality of passages formed in the nozzle.
Claim 10
Dependent Claim
161 words
A plasma arc torch having upper and lower body members formed with coaxial passages, an electrode supported from said upper body member and within said coaxial passages, and a nozzle supported from the lower.end of said lower body member, said nozzle having an axial passage through which an arc is formed between the electrode and a work piece, and characterized in that said lower body member and nozzle define an annular plenum; said lower body member being formed with a passageway for connecting a pressurized mixture of powder and inert gas with said annular plenum; said nozzle having a plurality of passages in open communication with said annular plenum, each passage being angularly directed and convergent with respect to the axial passage and circumferentially spaced around said axial passage whereby a pressurized mixture of powder and inert gas is passed through said lower body member into the annular plenum and convergently directed through the plurality of passages formed in the nozzle.
Claim 11
Dependent Claim
34 words
The plasma arc torch of claim 8, wherein said lower body member is internally threaded, said nozzle having a powder-gas discharge plate supported on a tubular stem threadably engaged with the lower body member.
Claim 12
Dependent Claim
67 words
The plasma arc torch of claim 9, wherein the upper face of said powder-gas discharge plate is formed with an annular groove, the ends of the plurality of passages formed in said nozzle terminating within said groove, said groove defining at least one portion of the plenum for a-powder-gas. mixture and wherein the lower end of said lower body is dished to receive said powder-gas discharge plate.
References Cited (Backward Citations)
No citation records indexed.
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