EP1575342A2 - Plasma-Schneidbrenner mit verschiedenen Gas-Zufuhrkreislaufen - Google Patents

Plasma-Schneidbrenner mit verschiedenen Gas-Zufuhrkreislaufen Download PDF

Info

Publication number
EP1575342A2
EP1575342A2 EP05300121A EP05300121A EP1575342A2 EP 1575342 A2 EP1575342 A2 EP 1575342A2 EP 05300121 A EP05300121 A EP 05300121A EP 05300121 A EP05300121 A EP 05300121A EP 1575342 A2 EP1575342 A2 EP 1575342A2
Authority
EP
European Patent Office
Prior art keywords
gas
plasma
chamber
cutting
orifices
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.)
Withdrawn
Application number
EP05300121A
Other languages
English (en)
French (fr)
Other versions
EP1575342A3 (de
Inventor
Edmond Baillot
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.)
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 a Directoire et Conseil de Surveillance 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 a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude filed Critical La Soudure Autogene Francaise
Publication of EP1575342A2 publication Critical patent/EP1575342A2/de
Publication of EP1575342A3 publication Critical patent/EP1575342A3/de
Withdrawn legal-status Critical Current

Links

Images

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
    • H05H1/3494—Means for controlling discharge parameters

Definitions

  • the present invention relates to a plasma arc work torch circuit of differentiated gas injection, in particular a plasma cutting torch, an installation comprising such a torch and its use in a plasma cutting process.
  • Figure 1 shows a general diagram of a plasma cutting plant conventional device generally comprising at least one connected electrical power source 101 by its poles, on the one hand, to the electrode of a torch 102 and, on the other hand, to the workpiece 103 forming the other electrode.
  • a source of ignition gas 104 or pilot gas supplies the torch 102 via a control means 105 of the pilot gas pressure.
  • a valve of sectioning 106 and a member 110, internal or external to the torch, allow the implementation relationship of the different power circuits to the torch.
  • the sectioning valve 106 allows to open the pilot gas circuit to the torch 102 or to close it according to the steps of sequencing related to cutting work.
  • a cutting gas source 107 feeds the torch 102 via a regulation means 108 of the cutting gas pressure, a valve of sectioning 9 and a member 110 for connecting the power supply circuits to the 2.
  • the cutting gas circuit can thus be opened or closed according to the steps of sequencing related to cutting work.
  • a device 111 for managing the operating sequences of the plasma cutting plant controls the opening / closing of sectioning 106 and 109, as well as the up / downs of the source electrical 101 as well for the phases of priming as for the cutting phases.
  • the device 111 also controls, before, simultaneously or after, the opening control of shutoff valves 106 and 109, the commissioning of regulating bodies 105 and 108.
  • the device 111 controls, from information indicating the transfer of the arc, for example via a current sensor (no shown) placed in the electrical circuit connecting the electric power source 101 to the piece 103, on the one hand, the substitution of the pilot gas by the cutting gas in causing the closing of the pilot gas shutoff valve 106 and the opening, quasi simultaneous operation of the cutting gas valve 109, and on the current of the electrical source 101, according to a predefined ramp to pass from the value of the pilot current to the value of the cutting current in order to establish a plasma arc 112 adapted to the cutting operation that must ensue.
  • a current sensor no shown
  • an opening ramp of said member 108 or pre-defined pressure rise is controlled before, simultaneously with or after the opening control of the shutoff valve 109.
  • a cycle stop command is sent to the device 110 which controls then the electrical source 101 to stop the current and, after a predefined time, the closing the cutting gas valve 109.
  • the pressure regulating member 108 is a controllable member to distance according to an operating instruction, it is controlled according to a ramp predefined closing, or lowering pressure by the device 111 before, simultaneously or after closing the sectioning gas cutting valve 9.
  • Torch 102 So the design of the gas injection in the arc chamber or chamber
  • the plasmagen of Torch 102 usually results from a compromise between injection to obtain a stable pilot arc, an efficient drilling phase, good cutting performance and arc-extinguishing without erosion of consumable parts, i.e. essentially nozzle and electrode.
  • the gas flow thus obtained is generally designed to optimize the steady state cutting performance, to the detriment of the performance of the other stages of the cutting process.
  • Figure 2 shows the lower parts of a nose or head of torch operating according to this principle, that is to say the torch 102 of Figure 1.
  • the electrode 6 is connected to one of the terminals of the power generator while being isolated from the nozzle 2 and the nozzle support by an insulating intermediate 4.
  • the supply circuits A and return B heat transfer liquid such as water distilled, for example, allow to evacuate the heat received by the nozzle 2 during the cutting, so as to avoid wear too fast thereof.
  • the gas is injected into the arc chamber 8, also called plasmagene chamber 8, by calibrated orifices D fed by a single circuit C of gas and carried by a diffuser part 7.
  • the dimensions and the distribution of said orifices D of the diffuser part 7 are depending on the chosen process and work intensity.
  • a single and unique gas injection circuit is therefore provided whatever the phase of the process, ie the same circuit serves to the supply of ignition gas and then plasma gas.
  • the same orifices D of the diffuser part 7 are used for the passage of the priming gas and that of the cutting gas.
  • the pilot arc of initiation is established by arc blowing between electrode 6 and nozzle 2, whether in continuous or alternating polarization, high frequency or other.
  • the characteristics of the pilot arc are related to the flow regime (arrows 11) of the pilot gas in the arc chamber 8, themselves determined by the characteristics of the injection: dimensions, number, orientation .... of the gas inlet ports D.
  • the pilot arc is then poorly stabilized at the electrode 6, its length and its tension are highly variable, and its average length is sometimes too short, which is detrimental to the arc transfer performance to the sheet 14.
  • the problem to be solved is therefore to improve the torches of the prior art by proposing a particular arrangement of plasma cutting torches to establish different gas flow regimes depending on the phase of operation, namely the priming phase and the cutting phase, so that the flow can be adjusted function of the specific characteristics of each phase.
  • the solution of the invention is then a plasma torch having a main body having a plasmagene chamber and a first working gas supply circuit opening into said plasmagene chamber for feeding said plasmagenic chamber into working gas, characterized in that it comprises a second gas supply circuit priming opening in said plasmagene chamber for supplying said chamber plasmagene as priming gas, said second priming gas supply circuit being at least partly separate from the first working gas supply circuit.
  • the invention also relates to a plasma arc work installation comprising a torch according to the invention, in particular an automatic plasma cutting installation.
  • the installation of the invention may furthermore comprise means supply gas supply and priming gas supply means, a source electrical current and control means, in particular a digital control.
  • the invention also relates to a method of cutting plasma of a metal part implementing such a torch or such an installation.
  • Figure 3 is a schematic representation of the part downstream, also called nose or head, a plasma torch according to the invention.
  • the torch described in FIG. 3 according to the invention is globally similar to that of the Figure 2, except that the gas supply circuits are differentiated at the level of of the injection of the cutting gas C and the ignition gas or pilot gas E. Thanks to such differentiation of the diet, we can better manage the feeding of the plasma chamber 8 in different gases and therefore improve their performance according to their own role in the sequencing of a section.
  • the supply of the arc gas chamber 8 cut is made by a plurality of calibrated orifices D and the supply of the arc chamber 8 in pilot gas is completely independent by a plurality of calibrated orifices F separate from the D.
  • Differentiation and optimization of the gas flow rely on an injection differentiated and staged, feeding a single diffuser 7 provided with sealing means 9, such joints or the like, necessary for the effective differentiation of the gas circuits.
  • pilot gas and the cutting gas do not pass through the same gas circuits in the torch body and are not distributed in room 8 plasmagenic through the same dispensing orifices which pass through the diffuser part 7.
  • the characteristics of the ignition arc or pilot arc are also clearly better because it has exceptional stability and a long arc length.
  • the results are even more noticeable as regards the constancy of the height of transfer, that is to say the distance between the end of the nozzle and the workpiece.
  • the height of transfer is defined as the height for which one is able to go from the scheme blown arc at the transferred arc regime. This height is detected simultaneously closed the two current return circuits, namely nozzle and sheet.
  • a measuring device present of current is arranged on the sheet circuit.
  • the pilot arc stage one Torch control to get closer to the sheet until current passes actually by the coin circuit.
  • the transfer is semi active. We lock the scheme transfer by opening the electric circuit of the nozzle. The entire current then passes through the sheet. The transfer is complete. Then the drilling step can begin with change of gas type (cutting gas pilot gas) and progressive increase of the intensity.
  • This technique of differentiation of the gas circuits can be applied by example to optimize the injection and flow properties for the phase of drilling of the sheet, after priming, but Page: 7 it could be generalized to the drilling phase, laser cutting or jet cutting of water.
  • the lateral blowing of molten metal projections by the Plasma jet, during drilling can be better controlled, which contributes to greatly increase the service life of nozzles which, without this optimization, are subject to the impact a large amount of molten metal splashes.
  • Figure 3 abstracts from the techniques of gas supply to the part lower part of the torch body where the gas diffuser or diffusers are located, these techniques being already well known from the state of the art.
  • the arrangement of the invention is advantageously applicable to all torches manual or automatic plasma cutting, irrespective of the applications, namely cutting of structural steels, stainless steels, aluminum alloys or other metals which may be cut by a plasma cutting; whatever plasmagene fluid is used, namely liquid, pure gas or mixture of several gases, of oxidizing or non-oxidizing type, neutral or chemically active, by example reducer, and whatever the power of the jet plasma (or laser or water jet).

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Arc Welding In General (AREA)
  • Plasma Technology (AREA)
EP05300121A 2004-03-09 2005-02-16 Plasma-Schneidbrenner mit verschiedenen Gas-Zufuhrkreislaufen Withdrawn EP1575342A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0450477 2004-03-09
FR0450477A FR2867405B1 (fr) 2004-03-09 2004-03-09 Torche de coupage plasma a circuits d'injection de gaz differencies

Publications (2)

Publication Number Publication Date
EP1575342A2 true EP1575342A2 (de) 2005-09-14
EP1575342A3 EP1575342A3 (de) 2006-02-15

Family

ID=34814588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05300121A Withdrawn EP1575342A3 (de) 2004-03-09 2005-02-16 Plasma-Schneidbrenner mit verschiedenen Gas-Zufuhrkreislaufen

Country Status (3)

Country Link
US (1) US20050199594A1 (de)
EP (1) EP1575342A3 (de)
FR (1) FR2867405B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9681529B1 (en) * 2006-01-06 2017-06-13 The United States Of America As Represented By The Secretary Of The Air Force Microwave adapting plasma torch module
ATE477884T1 (de) 2006-10-24 2010-09-15 Trumpf Inc Bewegliche gehäuse für lasereinrichtungen

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3027446A (en) * 1960-09-15 1962-03-27 Thermal Dynamics Corp Arc torch
US3313908A (en) * 1966-08-18 1967-04-11 Giannini Scient Corp Electrical plasma-torch apparatus and method for applying coatings onto substrates
DE1940040A1 (de) * 1968-08-07 1970-03-12 Hitachi Ltd Plasmabrenner
US5166494A (en) * 1990-04-24 1992-11-24 Hypertherm, Inc. Process and apparatus for reducing electrode wear in a plasma arc torch
US5070227A (en) * 1990-04-24 1991-12-03 Hypertherm, Inc. Proceses and apparatus for reducing electrode wear in a plasma arc torch
DE4034731A1 (de) * 1990-10-30 1992-05-07 Mannesmann Ag Plasmabrenner zum schmelzen und warmhalten von in gefaessen zu behandelnden materialien
US5290995A (en) * 1991-12-20 1994-03-01 Esab Welding Products, Inc. Plasma arc cutting system having fluid metering and power control systems
US5414237A (en) * 1993-10-14 1995-05-09 The Esab Group, Inc. Plasma arc torch with integral gas exchange
US6121570A (en) * 1998-10-28 2000-09-19 The Esab Group, Inc. Apparatus and method for supplying fluids to a plasma arc torch
US6772040B1 (en) * 2000-04-10 2004-08-03 Hypertherm, Inc. Centralized control architecture for a plasma arc system
US6717096B2 (en) * 2001-02-27 2004-04-06 Thermal Dynamics Corporation Dual mode plasma arc torch

Also Published As

Publication number Publication date
FR2867405A1 (fr) 2005-09-16
US20050199594A1 (en) 2005-09-15
EP1575342A3 (de) 2006-02-15
FR2867405B1 (fr) 2006-04-28

Similar Documents

Publication Publication Date Title
CA2667597A1 (fr) Dispositif et procede de soudage automatique sous eau pour la realisation sur une surface d'un joint a souder
FR2817017A1 (fr) Refroidissement integral des injecteurs de decollage d'une chambre de combustion a deux tetes
CH543711A (fr) Générateur à jet de plasma
CA2290146A1 (fr) Ensemble tuyere/porte-tuyere pour torche a plasma
FR2852541A1 (fr) Procede de coupage plasma avec double flux de gaz
WO1999053734A1 (fr) Torche et procede de coupage ou soudage a l'arc electrique
EP0155254B1 (de) Lichtbogenplasmabrenner
EP1933607A1 (de) Plasma-Schneidbrenner mit Kühlkreislauf und adaptativem Steigrohr
EP1575342A2 (de) Plasma-Schneidbrenner mit verschiedenen Gas-Zufuhrkreislaufen
EP1125671B1 (de) Steuerung der Strömung des Schneidplasmagases durch den Zündgasdruck
EP2282866A2 (de) Verfahren und vorrichtung zur brennschneidung eines stahlteils mit druck- oder flussratenanstieg des gasförmigen sauerstoffs nach beginn der durchstechung
FR3000866A1 (fr) Torche a plasma d'arc avec regulation selective du debit de gaz plasmagene
FR2865424A1 (fr) Procede et installation de coupage plasma a courant asservi au gaz plasmagene
FR2774549A1 (fr) Electrode pour torche a plasma
EP2377373B1 (de) Verfahren zum erzeugen eines plasmaflusses
FR3012759A3 (fr) Systeme pour et procede de soudage et/ou de rechargement avec fil additionnel
WO1991001077A1 (fr) Torche a plasma
FR3067559B1 (fr) Procede de coupage plasma et torche pour la mise en oeuvre de ce procede
EP3625456B1 (de) Vorrichtung zur regelung der durchflussmenge einer treibflüssigkeit für ein elektrisches triebwerk
FR3019707A1 (fr) Torche a plasma d'arc avec chambre d'arc a geometrie amelioree
FR2798247A1 (fr) Torche a plasma avec systeme d'electrode a longue duree de vie
WO2013114007A1 (fr) Torche à plasma d'arc avec amélioration du centrage axial de l'électrode
FR2697319A1 (fr) Procédé et outil d'usinage thermique pour allumer un mélange gaz combustible-oxygène de chauffage capable de réduire l'émission de bruit à l'allumage.
FR2943568A1 (fr) Procede de coupage plasma avec controle de l'extinction de l'arc en fin de coupe
EP1578177A1 (de) Verfahren zum Plasmaschneiden mittels Zweistromgas

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR LV MK YU

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR LV MK YU

17P Request for examination filed

Effective date: 20060816

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: L'AIR LIQUIDE, S.A. A DIRECTOIRE ET CONSEIL DE S

Owner name: AIR LIQUIDE WELDING FRANCE

18W Application withdrawn

Effective date: 20060918