EP2063689B1 - Silberlegierungselektrode für Plasmabrenner - Google Patents

Silberlegierungselektrode für Plasmabrenner Download PDF

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Publication number
EP2063689B1
EP2063689B1 EP08169245A EP08169245A EP2063689B1 EP 2063689 B1 EP2063689 B1 EP 2063689B1 EP 08169245 A EP08169245 A EP 08169245A EP 08169245 A EP08169245 A EP 08169245A EP 2063689 B1 EP2063689 B1 EP 2063689B1
Authority
EP
European Patent Office
Prior art keywords
electrode
torch
plasma
insert
silver
Prior art date
Legal status (The legal status 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 status listed.)
Revoked
Application number
EP08169245A
Other languages
English (en)
French (fr)
Other versions
EP2063689A1 (de
Inventor
Benoit Barthelemy
Corinne Chovet
Frédéric Richard
Peter Uhlig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lincoln Electric Co France SA
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Air Liquide Welding France
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=39494854&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2063689(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude, Air Liquide Welding France filed Critical Air Liquide SA
Publication of EP2063689A1 publication Critical patent/EP2063689A1/de
Application granted granted Critical
Publication of EP2063689B1 publication Critical patent/EP2063689B1/de
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05H1/32—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
    • H05H1/3442—Cathodes with inserted tip

Definitions

  • the invention relates to a silver alloy electrode for plasma cutting torch, automatic or manual, preferably an automatic torch, a plasma torch provided with such an electrode and its use in a plasma cutting operation of a part metallic.
  • the arc plasma cutting torches all rely on a similar architecture including an electrode formed of a body within which is fixed an emissive insert, a gas diffuser and a nozzle for constricting the plasma jet.
  • the electrodes used in these plasma torches are formed of a body of copper and / or copper alloy in which is fixed an electron emitting insert or emissive insert Depending on the oxidizing nature or not the plasma gas used in the torch, the insert is either tungsten or hafnium or zirconium.
  • tungsten insert electrode is used, whereas if an inert or reducing gas, such as nitrogen, argon, hydrogen, CH 4 or mixtures thereof, is used, a tungsten insert electrode is used, whereas if the gas is oxidizing, that is ie containing or formed of oxygen or CO 2 , an insert made of hafnium or zirconium is used which will be less rapidly degraded than a tungsten insert by the oxidizing action of the gas.
  • an inert or reducing gas such as nitrogen, argon, hydrogen, CH 4 or mixtures thereof
  • EP-A-1147692 proposed an electrode formed of an alloy of copper and tellurium.
  • EP-A-980197 suggested the incorporation of the hafnium or tungsten insert into a silver alloy sleeve, itself attached to the copper electrode body.
  • the document US-B-6563075 has also suggested the use of an electrode whose body is formed of copper or pure silver, the use of pure silver having the disadvantage of increasing the manufacturing cost of the electrode.
  • a problem that arises is therefore to further improve, and if possible significantly, the lifetime of these electrodes and more particularly to reduce the wear rate of the inserts of the electrodes, when used in a plasma cutting torch. to perform a plasma cutting operation and without the need to change the architecture of current plasma torches.
  • a plasma torch electrode that is to say designed and adapted to be mounted in a plasma arc torch, formed of an electrode body comprising a cavity in which is fixed an insert emissive, characterized in that said electrode body is formed of an alloy containing between 91 and 92.95% by weight of silver, from 2 to 7% by weight of copper, less than 1% by weight of aluminum and less than 1% by weight of nickel.
  • the invention also relates to a plasma torch comprising a torch body provided with an emissive insert electrode according to the invention, as well as to a plasma arc cutting method, in which a torch or an electrode is used.
  • a plasma arc cutting method in which a torch or an electrode is used.
  • a metal part in particular a steel plate, stainless steel, aluminum or an aluminum alloy, copper, or galvanized steel or electro-galvanized (ie with surface coating of zinc) .
  • the electrode 1 according to the invention is of "bicorps" type, that is to say that it consists of an electrode body 2 serving as a support for an emitting tip 3 in hafnium or tungsten.
  • This insert 3 typically of cylindrical shape, is fixed by soldering, stamping, crimping or other within a cavity 4, such as a blind hole, arranged at the downstream end 2a of the electrode body 1.
  • the electrode body 2 is formed of a silver alloy.
  • the silver content of the alloy is between 91 and 92.95% by weight (based on the weight of the alloy constituting the electrode body), and if possible higher.
  • the other alloying elements or secondary alloying elements may be copper, aluminum or nickel, in particular alloys containing between 91 and 92.95% silver and silver. 2 to 7% by weight of copper may be used.
  • the presence in the form of traces of other metallic elements is also possible or even inevitable with regard to impurities.
  • the electrode body 2 can be made of an alloy comprising about 7% copper, about 1% aluminum and / or nickel and silver for the rest, apart from the presence of unavoidable impurities.
  • the electrode body 2 has an elongate shape, preferably generally tubular or cylindrical, and comprises, at its upstream end 2b, a blind internal recess 5 sized to receive the plunger tube of the plasma torch in which the electrode 1 is inserted, as shown in Figure 3 .
  • the electrode 1 is usually cooled by a cooling fluid, such as deionized water or a mixture of water and glycol, circulating in the circuit. torch cooling.
  • a cooling fluid such as deionized water or a mixture of water and glycol
  • This cooling fluid is bathed inside the hollow electrode 1 to evacuate the heat released by the arc while being guided in particular by the dip tube of the torch.
  • Conventional fastening means 6 allow attachment of the electrode 1 in the body of the plasma torch, for example a thread or a tapping arranged in the electrode body 2 allowing a screwing of the electrode 1 in the body of the torch. Such attachment is conventional in plasma cutting torches.
  • the electrode body 2 in which is fixed the emitting insert 3 is formed of an alloy containing between 91 and 92.95% by weight of silver.
  • the use of such a silver alloy significantly improves the heat transfer, that is to say the energy transfer of molten metal bath of the insert 3 to the circuit of torch cooling.
  • the thermal conductivity of silver being stronger than that of copper or its alloys, the heat transfer from hot zones to the cooling circuit is more easily performed.
  • the evaporation of hafnium and / or tungsten during the arc phases is decreased and / or slowed down.
  • This better heat transfer also limits the volume of the hafnium bath and / or molten tungsten that can be ejected during the extinction of the plasma.
  • the electric transfer is also improved by the use of this silver-based alloy due to its higher electrical conductivity.
  • the star represented in Figure 3 corresponds, in turn, the wear of a standard copper alloy electrode, namely a cupro-tellurium alloy, supporting a hafnium insert.
  • a standard copper alloy electrode namely a cupro-tellurium alloy, supporting a hafnium insert.
  • such an electrode manufactured according to the prior art has a service life of between 150 and 200 cutting cycles of 20 seconds each, which corresponds to a maximum permissible wear of approximately 2 mm.
  • the intensity of the cutting current is 120 A and the plasma gas used is oxygen.
  • an electrode according to the invention makes it possible to obtain a significantly longer lifetime since the curve obtained (right on Fig. 3 ) shows that the silver electrode according to the invention undergoes regular wear until reaching a crater depth close to 2.5 mm after about 300 to 325 cutting cycles.
  • An electrode according to the invention therefore has improved performance in terms of lifetime compared to a conventional copper alloy electrode.
  • an electrode according to the invention undergoes regular wear until reaching a crater depth close to 2.7 mm after about 600 cutting cycles, or about 44 minutes. However, the electrode was not destroyed at the end of the test and about 200 additional cycles could be performed for a total cutting time of the order of 53 minutes.
  • a plasma torch provided with an electrode according to the invention can be used to operate a plasma arc cut of a metal part, such as a plate or a sheet, in particular of carbon steel, with or without a surface coating, made of steel stainless steel, copper, aluminum, titanium or light alloy.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)

Claims (6)

  1. Elektrode (1) für Plasmabrenner, die aus einem Elektrodenkörper (2) gebildet ist, der einen Hohlraum (4) umfasst, innerhalb dessen ein Emissionseinsatz (3) befestigt ist, dadurch gekennzeichnet, dass der Elektrodenkörper (2) aus einer Legierung geformt ist, die zwischen 91 und 92,95 Gewichts-% Silber, von 2 bis 7 Gewichts-% Kupfer, weniger als 1 Gewichts-% Aluminium und weniger als 1 Gewichts-% Nickel enthält.
  2. Elektrode nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Elektrodenkörper (2) eine längliche Form aufweist und eine blinde innere Aussparung (5) aufweist.
  3. Elektrode nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Elektrodenkörper (2) ein abwärts liegendes Ende (2a) umfasst, das den Emissionseinsatz (3) trägt, ein aufwärts liegendes Ende (2b), in dessen Bereich die blinde innere Aussparung (5) mündet, und Befestigungsmittel (6), die entwickelt und ausgelegt sind, um eine Befestigung der Elektrode (1) im Körper eines Plasmabrenners zu ermöglichen.
  4. Elektrode nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Emissionseinsatz (3) aus Wolfram, Hafnium oder Zirkonium ist.
  5. Plasmabrenner, der einen Brennerkörper umfasst, der mit einer Elektrode (1) mit Emissionseinsatz (3) nach einem der vorhergehenden Ansprüche versehen ist.
  6. Verfahren zum Plasmaschneiden eines Metallteils, in dem ein Brenner nach Anspruch 5 oder eine Elektrode nach einem der Ansprüche 1 bis 4 zum Schneiden eines Metallteils, insbesondere einer Platte aus Stahl, rostfreiem Stahl, Aluminium oder aus einer Aluminiumlegierung, verwendet wird.
EP08169245A 2007-11-20 2008-11-17 Silberlegierungselektrode für Plasmabrenner Revoked EP2063689B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0759176A FR2923977B1 (fr) 2007-11-20 2007-11-20 Electrode en alliage d'argent pour torche a plasma.

Publications (2)

Publication Number Publication Date
EP2063689A1 EP2063689A1 (de) 2009-05-27
EP2063689B1 true EP2063689B1 (de) 2012-09-26

Family

ID=39494854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08169245A Revoked EP2063689B1 (de) 2007-11-20 2008-11-17 Silberlegierungselektrode für Plasmabrenner

Country Status (2)

Country Link
EP (1) EP2063689B1 (de)
FR (1) FR2923977B1 (de)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0794697B2 (de) 1991-04-12 2009-12-16 Hypertherm, Inc. Lichtbogen-Plasmaschneidvorrichtung
US5310988A (en) 1992-05-20 1994-05-10 Hypertherm, Inc. Electrode for high current density plasma arc torch
FR2698301B1 (fr) 1992-11-20 1994-12-23 Soudure Autogene Francaise Torche de coupage plasma.
US5380976A (en) 1992-12-11 1995-01-10 Hypertherm, Inc. Process for high quality plasma arc and laser cutting of stainless steel and aluminum
JPH08288095A (ja) * 1995-04-19 1996-11-01 Komatsu Ltd プラズマアークトーチ用電極
US5857888A (en) * 1996-10-28 1999-01-12 Prometron Technics Corp. Method of manufacturing a plasma torch eletrode
US6020572A (en) 1998-08-12 2000-02-01 The Esab Group, Inc. Electrode for plasma arc torch and method of making same
FR2787676B1 (fr) 1998-12-18 2001-01-19 Soudure Autogene Francaise Piece d'usure pour torche de travail a l'arc realisee en cuivre allie
FR2805194B1 (fr) 2000-02-18 2002-06-28 Air Liquide Procede et installation de travail a l'arc plasma avec melange gazeux a base d'hydrogene, d'azote et/ou d'argon
FR2807283B1 (fr) 2000-03-30 2002-10-11 Soudure Autogene Francaise Torche a plasma avec amorcage par contact entre l'electrode et la tuyere
US6483070B1 (en) 2001-09-26 2002-11-19 The Esab Group, Inc. Electrode component thermal bonding
US6563075B1 (en) * 2001-12-20 2003-05-13 The Esab Group, Inc. Method of forming an electrode
FR2852479A1 (fr) * 2003-03-14 2004-09-17 Air Liquide Electrode a insert en hf-zr pour torche de coupage plasma
EP1578177A1 (de) 2004-03-19 2005-09-21 La Soudure Autogene Francaise Verfahren zum Plasmaschneiden mittels Zweistromgas

Also Published As

Publication number Publication date
FR2923977A1 (fr) 2009-05-22
EP2063689A1 (de) 2009-05-27
FR2923977B1 (fr) 2010-03-26

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