EP0410875B1 - Elektrode für Plasmalichtbogenbrenner und entsprechender Brenner - Google Patents

Elektrode für Plasmalichtbogenbrenner und entsprechender Brenner Download PDF

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Publication number
EP0410875B1
EP0410875B1 EP90402132A EP90402132A EP0410875B1 EP 0410875 B1 EP0410875 B1 EP 0410875B1 EP 90402132 A EP90402132 A EP 90402132A EP 90402132 A EP90402132 A EP 90402132A EP 0410875 B1 EP0410875 B1 EP 0410875B1
Authority
EP
European Patent Office
Prior art keywords
electrode
torch
insert
face
nozzle
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.)
Expired - Lifetime
Application number
EP90402132A
Other languages
English (en)
French (fr)
Other versions
EP0410875A1 (de
Inventor
Patrick Degrigny
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Lincoln Electric Company France SA
Original Assignee
La Soudure Autogene Francaise
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 La Soudure Autogene Francaise, Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical La Soudure Autogene Francaise
Priority to AT90402132T priority Critical patent/ATE102431T1/de
Publication of EP0410875A1 publication Critical patent/EP0410875A1/de
Application granted granted Critical
Publication of EP0410875B1 publication Critical patent/EP0410875B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05H1/3442—Cathodes with inserted tip
    • 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
    • H05H1/3489—Means for contact starting

Definitions

  • the present invention relates to plasma arc work torches with short-circuit ignition. It relates firstly to an electrode for such a torch, of the type comprising an electroconductive support having an end provided with an emissive insert, in particular made of zirconium or hafnium.
  • Plasma cutting torches operating under oxidizing plasma gas are generally equipped with an emissive cathode of zirconium or hafnium, inserted in a copper part acting as an electroconductive support and cooler, the assembly being commonly called electrode.
  • the root of the arc clings to the center of the cathode, where a crater gradually forms on the surface of which a layer of zirconium oxide or hafnium develops.
  • this oxide is fluid and conductive and allows cathodic emission.
  • the oxide solidifies and becomes insulating. Upon solidification, an oxide bead frequently forms on the periphery of the crater, which protrudes from the front surface of the insert.
  • the insert is flush with the end face of the support.
  • the oxide bead protrudes beyond this end face. If this bead has no annoying character in the case of a conventional torch, where the electrode and nozzle are fixed and where the establishment of the arc is initiated by a high frequency discharge, in the case of torches with short-ignition circuit, as described in documents FR-A-2 556 549 and 2 562 748, where the ignition of the arc is obtained by producing a short circuit between the electrode and the nozzle, it sometimes happens that this bead d
  • the oxide forms an electrically insulating barrier which prevents the reliable passage of current between the electrode and the nozzle and, consequently, the reliable ignition of the arc.
  • the object of the invention is to improve the reliability of the ignition of the arc in short-circuit ignition torches, with a simple arrangement and not incurring the costs of manufacturing the torches.
  • it relates to an electrode for a plasma arc work torch, of the aforementioned type, characterized in that a part of the end of the support situated around the insert comprises at least one portion of material electroconductive protruding axially with respect to the insert.
  • the invention also relates to a plasma arc work torch, of the type comprising a torch body in which an electrode having an end face in which an emissive insert is mounted, and a nozzle having an internal face in look of the end face, are mounted movable relative to each other between a first working position, where said faces are spaced from each other and a second position where said faces are in mutual contact , characterized in that, in the second position, a space is provided between the insert and the portion facing the internal face of the nozzle.
  • the torch shown in Figure 1 to the extent necessary for understanding the invention is essentially that described in the document FR-A-2 556 549 cited above. It has a general symmetry of axis XX supposed to be vertical and comprises a tubular body 1 in which is fixed an axial electrode 2.
  • a nozzle holder 3, screwed onto the body 1, defines an abutment shoulder 4 for a shaped nozzle 5 cup mounted sliding axially and biased towards the shoulder 4 by a spring 6 and, in service, also by the pressure of the plasma gas arriving through the annular space 7 existing between the body 1 and the electrode 2.
  • the nozzle 5 which is pierced with a central axial hole 8 for the exit of the arc and the plasma, is axially movable between a normal working position, as shown, spaced from the lower end of the electrode , and a second arc ignition position by short circuit, in which the internal transverse face of the nozzle comes into contact with the lower end face 9 of the electrode by pressing on the metal part to be cut (not shown), an electric voltage being applied between the electrode and this part.
  • the electrode 2 essentially comprises a copper electroconductive support 10, the end face 9 of which is flat and horizontal.
  • a cylindrical counterbore 11 is machined in the end face, and in the flat and horizontal bottom 12 of the latter is formed a blind cylindrical recess 13 of smaller diameter.
  • the central part of the insert 14 forms a crater 15 the periphery of which is covered with a circular bead 16 electrically insulating zirconium oxide or hafnium oxide ( Figure 2). Thanks to the presence of the counterbore 11, this bead 16 does not protrude beyond the end face 9 of the support 10, so that the ignition of the arc by short circuit can continue to take place from reliably.
  • an oxidizing plasma gas which is for example air or oxygen

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Arc Welding Control (AREA)
  • Spark Plugs (AREA)

Claims (9)

  1. Elektrode für Plasmalichtbogenbrenner mit Kurzschlußzündung, mit einem elektrisch leitenden Träger (10), der ein mit einem emittierenden Einsatzstück (14) aus insbesondere Zirkonium oder Hafnium versehenes Ende aufweist, dadurch gekennzeichnet, daß ein Teil des um das Einsatzstück (14) herum angeordneten Trägerendes zumindest einen Abschnitt aus elektrisch leitendem Material umfaßt, der axial über das Einsatzstück übersteht.
  2. Elektrode nach Anspruch 1, dadurch gekennzeichnet, daß der überstehende Abschnitt kreisförmig ist.
  3. Elektrode nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der überstehende Abschnitt einstückig mit dem Träger (10) ausgebildet ist.
  4. Elektrode nach Anspruch 3, dadurch gekennzeichnet, daß das Einsatzstück (14) in einer Bohrung (13) befestigt ist, die im Boden einer kreisförmigen Vertiefung (11) vorgesehen ist, welche in die Stirnfläche (9) des Trägers (10) eingelassen ist.
  5. Elektrode nach Anspruch 4, dadurch gekennzeichnet, daß der Durchmesser der Vertiefung (11) größer als derjenige der Bohrung (13) ist.
  6. Plasmalichtbogenbrenner, mit einem Brennerkörper (1), in dem eine Elektrode (2) mit einer Stirnfläche (9), in der ein emittierendes Einsatzstück (16) befestigt ist, und eine Düse (5) mit einer der Stirnfläche gegenüberliegenden Innenfläche gegeneinander beweglich zwischen einer ersten Arbeitsstellung, in der die Flächen voneinander beabstandet sind, und einer zweiten Stellung zur Zündung des Lichtbogens, in der sich die Flächen gegenseitig berühren, angebracht sind, dadurch gekennzeichnet, daß in der zweiten Stellung ein Zwischenraum zwischen dem Einsatzstück (16) und dem Abschnitt (9) gegenüber der Innenfläche der Düse (5) vorgesehen ist.
  7. Brenner nach Anspruch 6, dadurch gekennzeichnet, daß die Elektrode nach einem der Ansprüche 1 bis 5 ausgebildet ist.
  8. Brenner nach Anspruch 6, dadurch gekennzeichnet, daß der Abschnitt gegenüber der Innenfläche der Düse (5) bezüglich dieser Innenfläche rückversetzt ist.
  9. Brenner nach Anspruch 8, dadurch gekennzeichnet, daß der gegenüberliegende Abschnitt der Boden einer Vertiefung (11) ist, die in der Innenfläche der Düse (5) ausgebildet ist.
EP90402132A 1989-07-28 1990-07-25 Elektrode für Plasmalichtbogenbrenner und entsprechender Brenner Expired - Lifetime EP0410875B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90402132T ATE102431T1 (de) 1989-07-28 1990-07-25 Elektrode fuer plasmalichtbogenbrenner und entsprechender brenner.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8910224 1989-07-28
FR8910224A FR2650470B1 (de) 1989-07-28 1989-07-28

Publications (2)

Publication Number Publication Date
EP0410875A1 EP0410875A1 (de) 1991-01-30
EP0410875B1 true EP0410875B1 (de) 1994-03-02

Family

ID=9384265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90402132A Expired - Lifetime EP0410875B1 (de) 1989-07-28 1990-07-25 Elektrode für Plasmalichtbogenbrenner und entsprechender Brenner

Country Status (10)

Country Link
US (1) US5083005A (de)
EP (1) EP0410875B1 (de)
JP (1) JPH0642991B2 (de)
KR (1) KR910004074A (de)
AT (1) ATE102431T1 (de)
CA (1) CA2021836C (de)
DE (1) DE69006965D1 (de)
FR (1) FR2650470B1 (de)
NO (1) NO903178L (de)
PT (1) PT94835B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2172662C1 (ru) * 2000-08-29 2001-08-27 Осинцев Григорий Владиславович Электрод для плазменной обработки

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1243170B (it) * 1990-11-29 1994-05-24 Trafimet Trafilerie Metalliche Torcia per taglio al plasma con innesco per contatto
FR2735710B1 (fr) * 1995-06-23 1997-07-25 Soudure Autogene Francaise Tete de torche a plasma et torche a plasma la comportant
FR2750286B1 (fr) * 1996-06-24 1998-07-24 Soudure Autogene Francaise Tete de torche a plasma
US5897795A (en) * 1996-10-08 1999-04-27 Hypertherm, Inc. Integral spring consumables for plasma arc torch using blow forward contact starting system
US5994663A (en) * 1996-10-08 1999-11-30 Hypertherm, Inc. Plasma arc torch and method using blow forward contact starting system
US5886315A (en) * 1997-08-01 1999-03-23 Hypertherm, Inc. Blow forward contact start plasma arc torch with distributed nozzle support
AU9477598A (en) * 1997-09-10 1999-03-29 Esab Group, Inc., The Electrode with emissive element having conductive portions
US6703581B2 (en) 2001-02-27 2004-03-09 Thermal Dynamics Corporation Contact start plasma torch
RU2239532C1 (ru) * 2003-07-16 2004-11-10 Осинцев Григорий Владиславович Электрод для плазменной обработки
US20070045241A1 (en) * 2005-08-29 2007-03-01 Schneider Joseph C Contact start plasma torch and method of operation
US8101882B2 (en) * 2005-09-07 2012-01-24 Hypertherm, Inc. Plasma torch electrode with improved insert configurations
DE102008062731C5 (de) 2008-12-18 2012-06-14 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Elektrode für einen Plasmabrenner
US8362387B2 (en) 2010-12-03 2013-01-29 Kaliburn, Inc. Electrode for plasma arc torch and related plasma arc torch
EP2681974B1 (de) * 2011-02-28 2020-06-17 Victor Equipment Company Plasmaschneidspitze mit erweiterten kühlkanälen
USD692402S1 (en) * 2012-03-08 2013-10-29 Hypertherm, Inc. Plasma torch electrode
US9949356B2 (en) 2012-07-11 2018-04-17 Lincoln Global, Inc. Electrode for a plasma arc cutting torch
KR101942019B1 (ko) * 2017-09-12 2019-01-24 황원규 플라즈마 토치
CN113038680B (zh) * 2021-02-05 2022-06-28 浙江大学 一种耐电弧烧蚀的电极结构及其制备方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930139A (en) * 1974-05-28 1975-12-30 David Grigorievich Bykhovsky Nonconsumable electrode for oxygen arc working
US4059743A (en) * 1974-10-28 1977-11-22 Eduard Migranovich Esibian Plasma arc cutting torch
FR2556549B1 (fr) * 1983-12-07 1986-10-17 Soudure Autogene Francaise Procede d'allumage d'un arc pour torche de soudage ou coupage et torche adaptee a mettre en oeuvre ce procede
SE452862B (sv) * 1985-06-05 1987-12-21 Aga Ab Ljusbagselektrod
US4810851A (en) * 1985-07-22 1989-03-07 Gossudarsvenny Proektny i Nauchno-Issledovatelsky Institute Nikelevo-Kobaltovoi Promyshylennosti Method of constantly restoring an electrode during plasma treatment of materials
US4769524A (en) * 1987-10-23 1988-09-06 Hardwick Steven F Plasma electrode
US4864097A (en) * 1988-09-23 1989-09-05 Emerson Electric Co. Plasma arc torch with confined and controlled plasma jet column

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2172662C1 (ru) * 2000-08-29 2001-08-27 Осинцев Григорий Владиславович Электрод для плазменной обработки

Also Published As

Publication number Publication date
FR2650470A1 (de) 1991-02-01
CA2021836C (fr) 1995-12-19
NO903178L (no) 1991-01-29
PT94835A (pt) 1992-02-28
PT94835B (pt) 1997-05-28
NO903178D0 (no) 1990-07-17
DE69006965D1 (de) 1994-04-07
CA2021836A1 (fr) 1991-01-29
FR2650470B1 (de) 1992-09-04
US5083005A (en) 1992-01-21
ATE102431T1 (de) 1994-03-15
JPH03151169A (ja) 1991-06-27
EP0410875A1 (de) 1991-01-30
KR910004074A (ko) 1991-02-28
JPH0642991B2 (ja) 1994-06-08

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