WO1990010366A1 - Torche a arc de plasma - Google Patents

Torche a arc de plasma Download PDF

Info

Publication number
WO1990010366A1
WO1990010366A1 PCT/GB1990/000318 GB9000318W WO9010366A1 WO 1990010366 A1 WO1990010366 A1 WO 1990010366A1 GB 9000318 W GB9000318 W GB 9000318W WO 9010366 A1 WO9010366 A1 WO 9010366A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
torch
nozzle
sleeve
plasma arc
Prior art date
Application number
PCT/GB1990/000318
Other languages
English (en)
Inventor
Charles Peter Heanley
Peter Malcolm Cowx
John Arthur Lafford
John Kenneth Pargeter
Original Assignee
Tetronics Research & Development Company Limited
International Mill Service Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetronics Research & Development Company Limited, International Mill Service Inc. filed Critical Tetronics Research & Development Company Limited
Publication of WO1990010366A1 publication Critical patent/WO1990010366A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/28—Cooling arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3436—Hollow cathodes with internal coolant flow

Definitions

  • This invention relates to plasma arc torches, e.g. of an electric arc furnace.
  • the electrode of a plasma arc torch requires cooling.
  • An object of one aspect of the invention is to facilitate improved cooling of the electrode.
  • a plasma arc torch having an electrode and an electrode cooling system comprising a passage having: an axially extending delivery portion for delivery of fluid to cool the electrode; an axially extending return portion for return of the fluid, one of the delivery and return portions being located within the other; and walls defining a restricted radially extending intermediate portion connecting the delivery and return portions adjacent the electrode.
  • radially extending it is intended to include passages which are curved or otherwise formed in section, so as to have a component in the axial direction.
  • the restricted intermediate portion of the passage speeds up the flow of cooling fluid adjacent the electrode so that cooling flow of cooling fluid adjacent the electrode so that cooling efficiency can be increased.
  • the intermediate portion extends undivided in all radial directions.
  • the width between the walls of the intermediate portion preferably decreases with increasing radius. This compensates for the increasing width of the passage in a circumferential direction thereby reducing or removing the reduction in the velocity of the fluid which would otherwise occur in the direction of increasing radius in the intermediate portion.
  • the invention provides a plasma arc torch comprising a nozzle, an electrode housed within the nozzle such that an annular gas channel is defined therebetween, an electrode support tube connected at its forward end to the electrode and having a rearward axially extending portion maintained in spaced relationship from the nozzle by an annular spacer, which spacer includes a plurality of circumferentially spaced fins defining gas channels therebetween and wherein the fins are arranged in substantially helical orientation to promote helical gas flow within the gas channel.
  • Helical flow of the gas serves to equalise the gas flow within the gas channel before it reaches the electrode.
  • the spacer includes flow restricting means. This acts as a resistance to the gas flow being pushed back into the torch due to pressure fluctuations in the furnace. Such back flow may result in contaminated gas contacting the electrode which results in rapid erosion.
  • the gas used may typically be argon, hydrogen, helium nitrogen or other inert gases may alternatively be used.
  • the torch In use the torch can become coated in powder or fused material so that when it becomes necessary to retract the torch from a furnace there must be sufficient clearance to allow for the increased diameter of the torch casing due to the accumulated debris.
  • apparatus for pivotally mounting a circulating plasma torch comprising a housing, a support defining an aperture through which the torch extends in use, ball joint means pivotally connecting the support member to the housing and a sleeve removably locatable in the aperture and not extending significantly therebeyond, to space the torch casing radially from the support member.
  • FIG. 1 is a sectional elevation of a plasma arc torch embodying aspects of the invention
  • Figure 2 is a sectional elevation of a housing for a plasma arc torch embodying aspects of the invention and fitted to an electric arc furnace;
  • Figure 3 is a schematic view of an electric arc furnace including a plasma arc torch
  • FIG 4 is a perspective view of the gas flow spacer of the torch of Figure 1
  • FIG. 5 is a sectional elevation of another plasma arc torch embodying aspects of the invention.
  • the electrode 2 is received in a nozzle 6 having an annular end fitting 7 mounted coaxially with the electrode.
  • the nozzle end fitting 7 defines an aperture 37 through which the electrode projects so as to define a gas ejection channel 8 therebetween.
  • the nozzle end fitting 7 includes a rearwardly extending tubular portion 9 connected to a nozzle support tube 10 which is maintained in radially spaced relationship from the electrode support tube 5 by an annular gas flow spacer 11.
  • a tubular outer casing 12 is connected at its forward end to the nozzle end fitting 7.
  • An electrode coolant tube 13 extends coaxially within the electrode support tube 5 so as to define a coolant supply passage.
  • a supply portion 14 of the passage is defined within the tube 13 and a coolant return portion 15 is defined between the exterior of the tube and the electrode support tube 5.
  • the electrode coolant tube 13 connects at its forward end with an annular flow directing member 16 located coaxially within the electrode support tube 5 such that its front end surface 17 is axially spaced from the rear surface 18 of the electrode 2 so as to provide walls to define a radially extending intermediate portion of the passage, communicating between the coolant supply and return channels 14 and 15 respectively.
  • a ⁇ usped projection 20 projects axially from the rear surface 18.
  • the flow directing member 16 defines a throat 21, part of the supply portion of the passage.
  • the throat is profiled to progressively constrict the flow path of coolant in the direction towards the electrode, the throat being flared at its forward end in the vicinity of the cusped projection 20 so that, with the cusp 20, it directs the coolant into the intermediate portion 19.
  • the portion 19 is illustrated as generally plane in cross section. However, in alternatives (not illustrated) the intermediate portion may be curved or otherwise formed in section so as to have a component resolved in the axial direction.
  • the width between the walls of the intermediate portion 19, i.e. between the flow directing member 16 and the rear face 18 of the electrode decreases progressively with increasing radius, i.e. outwardly.
  • the width of the passage in a circumferential direction increases as the radius increases.
  • the decrease in the width between the walls may completely balance the increase in the circumferential direction so that the coolant velocity remains substantially constant in the intermediate portion across the electrode.
  • the velocity of the coolant is preferably sufficient that the temperature of the returned coolant does not exceed 37 degrees Celsius.
  • the intermediate portion preferably has no divisions so that it extends undivided in all radial directions.
  • the external surface 36 of the flow directing member 16 defines part of the return portion of the passage with the support tube 5.
  • the exterior of the flow direction, member 16 is tapered in the direction away from the electrode, i.e. in the direction of return flow, such that the flow path becomes wider as coolant follows the return portion 15.
  • a number of circumferentially spaced location lugs 22 project radially from the flow directing member 16 into contact with the electrode support tube 5, rearward motion of the member 16 being prevented by abutment of the lugs with an annular shoulder 31 formed in the support tube 5 and forward motion of the flow directing member being prevented by abutment of the lugs with a cylindrical sleeve 32 acting as a spacer between the lugs and the electrode 2.
  • the flow directing member 16 is thereby precisely and firmly located in axial alignment with the tubular components of the torch 1 to ensure that the coolant flow path is circumferentially uniform.
  • a nozzle coolant tube 23 is nested between the nozzle support tube 10 and the outer casing 12 so as to define a nozzle coolant supply channel 24 within the tube 23 and an outermost nozzle coolant return channel 25.
  • the nozzle coolant tube 23 connects at its forward end with a flow directing collar 26 comprising two separable halves which are held together as a complete annulus and in contact with the tubular portion 9 of the nozzle end fitting 7 by means of a spring clip 27.
  • the collar 26 includes a conically tapered portion 28 at its forward end, which portion projects into a similarly tapered recess 29 formed in the end fitting 7.
  • the tapered portion 28 is spaced from the walls of the recess 29 so as to define an annular cavity 30 communicating between the nozzle coolant supply and return channels 24 and 25.
  • the collar 26 has a sleeve portion 33 at its rearward end which locates within a groove 34 formed externally in the tubular portion 9, the sleeve portion 33 being keyed to the groove 34 such that the collar 26 is positively and accurately located relative to the nozzle end fitting 7.
  • the spring clip 27 extends circumferentially around the sleeve portion 33.
  • the sleeve portion 33 is nested within the nozzle coolant tube 23 and is attached thereto, axially extending channels (not shown) being provided through the sleeve portion for the passage of nozzle coolant from within the nozzle coolant supply channel 24 into the annular cavity 30.
  • the gas flow spacer 11 is located rearwardly of the flow directing member 16 and is formed as a generally tubular sleeve of electrically insulating material, e.g. acetal.
  • the gas flow spacer 11 includes circumferentially spaced fins 35 which extend into contact with the nozzle support tube 10 and define therebetween helical flow channels 70 as seen in Figure 4 through which gas withi.n the gas channel 8 is able to pass longitudinally, the fins thereby being arranged to induce helical flow in that part of the gas channel which is located forward of the gas flow spacer 11.
  • the channels are dimensioned so as to present ' a restriction to the gas flow in order to impede the reverse flow of gas within the ejection channel 8 under conditions of pressure fluctuation in the furnace 40.
  • the electrode support tube 5 is connected to an electrical supply such that the electrode becomes the cathode of the plasma torch 1.
  • a flow of gas is supplied through the gas channel 8 such that once an arc has been established at the electrode 2 the gas which is ejected from the nozzle 6 is ionised and forms a plasma flame 44.
  • a supply of coolant flows through the electrode coolant tube 13 and follows a flow path through the. coolant supply channel 14, through the flow directing member 16 into the annular space 19 and is returned via the coolant return channel 15.
  • the flow path is constricted to its minimum cross-sectional area within the annular space 19 where the coolant is directed axially towards the cusped projection 20 and then radiates outwardly so as to pass over the rearward surface of the electrode 2 thereby providing direct cooling of the electrode.
  • Nozzle coolant is directed along the nozzle coolant channel 24 and passes through the sleeve portion 33 into the annular cavity 30 from which it exits to return through the nozzle coolant return channel 25. • The flow path of the nozzle coolant is most restricted in the vicinity of the annular cavity 30 where coolant absorbs heat from the nozzle end fitting 7.
  • the plasma torch 1 is mounted for use in an electric arc furnace 40 as shown in Figure 3 by means of a ball joint 41 such that the torch extends downwardly with nozzle 6 in proximity with the surface of a melt 42.
  • the ball joint 41 allows the torch 1 to be swivelled such that in use the nozzle 6 circulates in a closed path such as a circle or ellipse over the surface 42 so as to distribute the heating effect provided by a plasma 44 generated by the torch.
  • FIG. 2 Detail of the ball joint 41 is seen in Figure 2 where the outer casing 12 of the torch 1 is received in a split sleeve 45.
  • the sleeve 45 is formed from two halves which are held together by an O-ring 46.
  • the sleeve 45 is received within a tubular support 47 which is pivotable relative to a housing 48 by means of a part spherical annulus 49 slidably received within annular guides 50.
  • the sleeve 45 Adjacent the upper end 51 of the sleeve 45 the sleeve projects radially to form a collar 52, the tubular support 47 being conformably recessed such that downward movement of the sleeve is prevented by abutment on the collar with a shoulder 53 of the tubular support.
  • the sleeve 45 is retained against upward movement by an annular cap 54 which overlays the collar 52 and is held in place by means of an annular V-clamp 55.
  • the annulus 49 includes an upwardly extending tubular portion 57 having a radially extending lip 56 against which the cap 54 i.s compressed by means of the V-clamp 55.
  • the torch 1 is supplied with electrical power by means of a pair of water cooled arc leads 60 and with ejection gas by means of a gas supply line 61.
  • the arc leads 60 are flexible and comprise plaited braids of wire mounted in a water cooled sleeve. Connection to the furnace is made such that the electrode 2 is made cathode and the melt 43 is made anode.
  • Electrode coolant supply and return hoses 62 are provided together with nozzle coolant supply and return hoses 63.
  • Coolant water for the arc leads and for the electrode coolant supply and nozzle coolant supply is obtained from separate cold water sources using the coldest available water available on the site.
  • the V-clamp 55 When it is required to remove the torch 1 for inspection or renewal of the electrode 2 or nozzle 6 the V-clamp 55 is released and the cap 54 removed such that the torch together with the sleeve 45 can be raised relative to the support 47 and the housing 48.
  • the sleeve 45 slides readily within the tubular support 47 and subsequently the lower portion of the casing 12 is able to pass through the tubular support with sufficient clearance to accommodate surface debris which has accumulated in use within the furnace 40.
  • the thickness of the sleeve 45 is therefore designed to correspond to the required clearance around the casing 12. This arrangement thereby enables the torch 1 to be removed through the ball joint 41 without completely disassembling the ball joint components even when the casing 12 has accumulated debris in use.
  • the sleeve 45 can be removed from the torch 1 by removing the O-ring 46 so that the split sleeve 45 is separable into its component halves.
  • the torch 1 may then be serviced and subsequently reassembled into the furnace for reuse.
  • the arc leads may be cooled by water which has first been circulated through the electrode coolant flow path.
  • a heat exchanger may be used to recover heat from the returning water which can then be recirculated.
  • the coolant flow paths as indicated in the accompanying drawings may be reversed if required.
  • the O-ring 46 may alternatively be replaced by a spring clip.
  • FIG. 5 Another alternative is illustrated in Figure 5.
  • the electrode 2 is brazed to a carrier 40 which is removable from the electrode support tube 5.
  • the carrier 40 has an internal screw thread 42 which engages a conforming external thread 44 on the electrode support tube 5.
  • the thread should be of sufficient length to conduct the operating current to the electrode.
  • Two O-rings 46 and 48 seal the carrier 40 to the support tube 5 so as to prevent leakage of the coolant.
  • the rear face 18 of the electrode is recessed to receive the front of the flow directing member 16 so that the rim 50 of the rear face 18 of the electrode engages the lugs 22 on the flow directing member directly, without the need for a sleeve corresponding to the sleeve 32 in Figure 1.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)

Abstract

L'invention concerne une torche à arc de plasma comprenant une électrode et un système de refroidissement de l'électrode pourvu d'un passage ayant des parties d'alimentation et de retour à direction axiale placées l'une dans l'autre, pour l'alimentation de l'électrode en agent refroidissant et pour le retour de ce dernier en provenance de l'électrode. Selon l'un des aspects de l'invention, les deux parties sont reliées par une partie de régulation à direction radiale disposée de manière à augmenter la vitesse de l'agent refroidissant à proximité de la face arrière de l'électrode.
PCT/GB1990/000318 1989-03-03 1990-03-01 Torche a arc de plasma WO1990010366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898904858A GB8904858D0 (en) 1989-03-03 1989-03-03 Improvements in or relating to plasma arc torches
GB8904858.1 1989-03-03

Publications (1)

Publication Number Publication Date
WO1990010366A1 true WO1990010366A1 (fr) 1990-09-07

Family

ID=10652654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/000318 WO1990010366A1 (fr) 1989-03-03 1990-03-01 Torche a arc de plasma

Country Status (3)

Country Link
AU (1) AU5170890A (fr)
GB (1) GB8904858D0 (fr)
WO (1) WO1990010366A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2355379A (en) * 1999-10-12 2001-04-18 Tetronics Ltd Plasma torch electrode
WO2004093502A1 (fr) * 2003-04-11 2004-10-28 Hypertherm, Inc. Procede et appareil d'alignement des composants d'un chalumeau de soudage au plasma
EP1933607A1 (fr) 2006-12-13 2008-06-18 L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Torche de coupage plasma avec circuit de refroidissement à tube plongeur adaptatif
WO2010115397A2 (fr) * 2009-04-08 2010-10-14 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Tuyaux de refroidissement, logements d'électrode et électrode pour une torche à plasma à arc électrique et ensemble comprenant ces éléments ainsi que torche à plasma à arc électrique dotée de ces éléments
DE102009059108A1 (de) * 2009-12-18 2011-06-22 Holma Ag Elektrode mit Kühlrohr für eine Plasmaschneidvorrichtung
GB2568106A (en) * 2017-11-07 2019-05-08 Tetronics International Ltd Plasma Torch Assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569661A (en) * 1969-06-09 1971-03-09 Air Prod & Chem Method and apparatus for establishing a cathode stabilized (collimated) plasma arc
US4055741A (en) * 1975-12-08 1977-10-25 David Grigorievich Bykhovsky Plasma arc torch
US4369919A (en) * 1980-10-31 1983-01-25 Npk Za Kontrolno Zavarachni Raboti Plasma torch for processing metals in the air and under water
US4564740A (en) * 1978-01-09 1986-01-14 Institut Elektrosvarki Imeni E. O. Patona Akademii Nauk Ukrainskoi Ssr Method of generating plasma in a plasma-arc torch and an arrangement for effecting same
EP0271032A2 (fr) * 1986-12-11 1988-06-15 Castolin S.A. Procédé d'application d'une couche à l'intérieur de tubes ou de corps creux de sections étroites et torche à pulvérisation par plasma

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569661A (en) * 1969-06-09 1971-03-09 Air Prod & Chem Method and apparatus for establishing a cathode stabilized (collimated) plasma arc
US4055741A (en) * 1975-12-08 1977-10-25 David Grigorievich Bykhovsky Plasma arc torch
US4564740A (en) * 1978-01-09 1986-01-14 Institut Elektrosvarki Imeni E. O. Patona Akademii Nauk Ukrainskoi Ssr Method of generating plasma in a plasma-arc torch and an arrangement for effecting same
US4369919A (en) * 1980-10-31 1983-01-25 Npk Za Kontrolno Zavarachni Raboti Plasma torch for processing metals in the air and under water
EP0271032A2 (fr) * 1986-12-11 1988-06-15 Castolin S.A. Procédé d'application d'une couche à l'intérieur de tubes ou de corps creux de sections étroites et torche à pulvérisation par plasma

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2355379A (en) * 1999-10-12 2001-04-18 Tetronics Ltd Plasma torch electrode
WO2001028299A1 (fr) * 1999-10-12 2001-04-19 Tetronics Limited Electrode pour torche au plasma
JP2006523006A (ja) * 2003-04-11 2006-10-05 ハイパーサーム インコーポレイテッド プラズマアークトーチの構成要素の整列のための方法および装置
US6946617B2 (en) 2003-04-11 2005-09-20 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
EP1621052A1 (fr) 2003-04-11 2006-02-01 Hypertherm, Inc. Procede et appareil d'alignement des composants d'un chalumeau de soudage au plasma
US7019255B2 (en) 2003-04-11 2006-03-28 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma ARC torch
EP2271190A3 (fr) * 2003-04-11 2011-08-24 Hypertherm, INC. Procédé et dispositif pour aligner les composants d'une torche à plasma d'arc
US7193174B2 (en) 2003-04-11 2007-03-20 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
AU2004229670B2 (en) * 2003-04-11 2008-10-09 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
US7754996B2 (en) 2003-04-11 2010-07-13 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
EP2265098A3 (fr) * 2003-04-11 2011-11-02 Hypertherm, INC. Procédé et dispositif pour aligner des composants d'une torche a plasma d'arc
WO2004093502A1 (fr) * 2003-04-11 2004-10-28 Hypertherm, Inc. Procede et appareil d'alignement des composants d'un chalumeau de soudage au plasma
EP1933607A1 (fr) 2006-12-13 2008-06-18 L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Torche de coupage plasma avec circuit de refroidissement à tube plongeur adaptatif
DE102009016932A1 (de) * 2009-04-08 2010-10-21 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Kühlrohre, Elektrodenaufnahmen und Elektrode für einen Lichtbogenplasmabrenner sowie Anordnungen aus denselben und Lichtbogenplasmabrenner mit denselben
WO2010115397A3 (fr) * 2009-04-08 2011-03-03 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Tuyaux de refroidissement, logements d'électrode et électrode pour une torche à plasma à arc électrique et ensemble comprenant ces éléments ainsi que torche à plasma à arc électrique dotée de ces éléments
WO2010115397A2 (fr) * 2009-04-08 2010-10-14 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Tuyaux de refroidissement, logements d'électrode et électrode pour une torche à plasma à arc électrique et ensemble comprenant ces éléments ainsi que torche à plasma à arc électrique dotée de ces éléments
CN102388681A (zh) * 2009-04-08 2012-03-21 谢尔贝格芬斯特瓦尔德等离子机械有限公司 用于电弧等离子喷枪的冷却管、电极容纳部和电极以及由它们组成的装置和包括这些部件的电弧等离子喷枪
DE102009016932B4 (de) * 2009-04-08 2013-06-20 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Kühlrohre und Elektrodenaufnahme für einen Lichtbogenplasmabrenner sowie Anordnungen aus denselben und Lichtbogenplasmabrenner mit denselben
US9204526B2 (en) 2009-04-08 2015-12-01 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Cooling pipes, electrode holders and electrode for an arc plasma torch
CN107018618A (zh) * 2009-04-08 2017-08-04 谢尔贝格芬斯特瓦尔德等离子机械有限公司 冷却管、电极容纳部和电极以及装置和电弧等离子喷枪
US9743504B2 (en) 2009-04-08 2017-08-22 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Cooling pipes, electrode holders and electrode for an arc plasma torch
DE102009059108A1 (de) * 2009-12-18 2011-06-22 Holma Ag Elektrode mit Kühlrohr für eine Plasmaschneidvorrichtung
GB2568106A (en) * 2017-11-07 2019-05-08 Tetronics International Ltd Plasma Torch Assembly
WO2019092416A1 (fr) * 2017-11-07 2019-05-16 Tetronics (International) Limited Ensemble torche à plasma
GB2568106B (en) * 2017-11-07 2022-09-21 Tetronics Tech Limited Plasma Torch Assembly

Also Published As

Publication number Publication date
AU5170890A (en) 1990-09-26
GB8904858D0 (en) 1989-04-12

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