EP1284589A2 - Procédé de soudage par plasma - Google Patents

Procédé de soudage par plasma Download PDF

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Publication number
EP1284589A2
EP1284589A2 EP02017831A EP02017831A EP1284589A2 EP 1284589 A2 EP1284589 A2 EP 1284589A2 EP 02017831 A EP02017831 A EP 02017831A EP 02017831 A EP02017831 A EP 02017831A EP 1284589 A2 EP1284589 A2 EP 1284589A2
Authority
EP
European Patent Office
Prior art keywords
plasma
gas
tube
process gas
introducing
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Withdrawn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
EP02017831A
Other languages
German (de)
English (en)
Other versions
EP1284589A3 (fr
Inventor
Erwin Dr. Bayer
Stefan Laure
Jürgen Dr. Steinwandel
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.)
MTU Aero Engines AG
Original Assignee
DaimlerChrysler AG
MTU Aero Engines GmbH
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 DaimlerChrysler AG, MTU Aero Engines GmbH filed Critical DaimlerChrysler AG
Publication of EP1284589A2 publication Critical patent/EP1284589A2/fr
Publication of EP1284589A3 publication Critical patent/EP1284589A3/fr
Withdrawn legal-status Critical Current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
    • H05H1/30—Plasma torches using applied electromagnetic fields, e.g. high frequency or microwave energy

Definitions

  • the invention relates to a method for plasma welding according to claim 1.
  • Tungsten inert gas welding Tungsten inert gas welding
  • MAG metal active gas welding
  • TIG welding an arc burns between a non-consumable one Tungsten electrode and the workpiece, wherein the workpiece is melted.
  • the arc has a divergence angle of about 45 °. That means the distance between TIG torch and workpiece significantly affects the power density and this overall is comparatively low. Due to the high thermal conductivity A considerable proportion of the heat flows into the environment of the metals Weld off. At a limited by the life of the electrode current and thus also limited arc power result from it relatively small welding speeds.
  • the plasma jet at different Plasma welding process are constricted, thereby reducing the Arc divergence to about 10 ° (visually) can be effected.
  • This is at the technically usual distances between plasma torch and workpiece a higher Power density and resulting at identical arc performance a higher Welding speed reached.
  • a disadvantage of the described method is that the possible current intensity limited by the life of the electrodes and thus the welding speed is limited. This leads to a high heat load of Component, wide heat affected zones and beyond to a considerable delay of the workpiece.
  • the object of the invention is to specify a new method for plasma welding, which avoids the disadvantages of the prior art.
  • the ignition of the gas mixture takes place in particular by absorption of electromagnetic Radiation in the radio frequency range. But it is also possible that the gas mixture by absorption of electromagnetic radiation from the Microwave range can be ignited.
  • the coupling of the radio frequency energy in the gas mixture is carried out inductively by means of the wound around the RF-transparent tube Coupling coil.
  • the coupling coil can be configured such that a optimal coupling of the electromagnetic energy in the gas mixture possible is.
  • the pilot plasma can advantageously in a high-current arc discharge or in a electrodeless microwave discharge are generated.
  • an already ionized gas enters the RF transparent Pipe. There, the ionized gas is mixed with the second process gas.
  • the ignition threshold becomes Ignition of the gas mixture from the pilot plasma gas and the second process gas reduced. It is thus generated a high-energy plasma, in which almost the entire Radio frequency energy can be coupled.
  • the RF transparent tube is advantageously a tube with dielectric properties.
  • a tube made of SiO 2 or Al 2 O 3 in each case pure form without doping is used as rf-transparent tube.
  • the properties of the plasma jet with respect to a reduced diameter and a reduced beam angle divergence are improved.
  • the cylindrically symmetrical plasma jet propagates in parallel in the method according to the invention, whereby the influence of the change in distance between burner and workpiece on the Einbrandform of the plasma jet is reduced in the workpiece.
  • Another advantage is that it improves the accessibility to the plasma jet, caused by a larger possible distance between burner and workpiece.
  • the tangential feed of the second process gas supports the invention Generation of a plasma beam with low beam angle divergence.
  • Radial acceleration caused by the cross-sectional constriction of the expansion nozzle in Direction of the nozzle exit is further amplified, the non-uniform move accelerated free charge carriers in the direction of the expansion nozzle outlet ever narrower spiral paths, causing the centripetal acceleration of the charge carriers increases.
  • This movement is by the charge carriers even after exit retained from the expansion nozzle in the work space. Because of the different Ion and electron mobility locally no charge neutrality is present an axially oriented magnetic field is induced in the plasma jet, which leads to a Flow constriction of the plasma jet after exiting the nozzle leads.
  • the inventive Plasma beam by means of inexpensive and robust radio frequency systems, e.g. Oscillating circuit systems with a frequency of approx. 300 kHz up to the typical UHF range (about 1 -150 MHz) can be generated.
  • radio frequency systems e.g. Oscillating circuit systems with a frequency of approx. 300 kHz up to the typical UHF range (about 1 -150 MHz)
  • the energy efficiency increased compared to conventional plasma welding processes is also the energy efficiency increased compared to conventional plasma welding processes. So it is possible generate radio frequency-induced plasmas involving power coupling is greater than 90%. This results in comparison to welding processes with high-power diodes a 1.5 times and compared to laser welding a 20 times greater energy efficiency.
  • the second Process gas before entering the inductive coupling path ie before entering the RF-transparent Working tube, powder is supplied.
  • the invention Use method as a powder deposition welding process.
  • the plasma jet after exiting the expansion nozzle to supply the powder.
  • Another advantage of the plasma welding process according to the invention is that the Heat affected zone of the plasma jet is significantly reduced on the workpiece, What a lower heat input, a reduced workpiece distortion and a Reduction of the material damage has the consequence.
  • a low-defect welding regarding less edge notches and low porosity of the weld allows.
  • the second process gas is in such the inductive coupling zone is introduced, e.g. by means of one or more nozzles that the second process gas flowing into the pipe has a tangential and an inward direction the gas outlet opening of the pipe directed axial flow component having.
  • the metallic expansion nozzle seen in the flow direction of the plasma, the plasma side a convergent Inlet and plasma jet side on a free or divergent spout.
  • the flow velocity of the charge carriers of the plasma is convergent Enema up to the divergent spout increased.
  • FIGURE shows a possible embodiment for carrying out the invention Process.
  • a pilot plasma torch 1 receives a first process gas (not shown), e.g. Nitrogen, fed.
  • a pilot plasma 2 is generated, which is passed into a rf-transparent working tube 3.
  • the working tube 3 has a gas inlet opening 4 and a gas outlet opening 5.
  • a second process gas 6 in the working tube 3 initiated.
  • the supply of the second process gas 6 takes place in such a way that the second process gas 6 has a tangential and one in the direction of the gas outlet opening 5 directed axial flow component (not shown).
  • the working tube 3 is wrapped with a coupling coil 13, which by means of a not shown radio frequency energy is supplied.
  • a coupling coil 13 which by means of a not shown radio frequency energy is supplied.
  • absorption of Radio energy is in the area 14, in which the working tube 3 from the coupling coil 13 is wound, a rf plasma 7 ignited.
  • a metallic expansion nozzle 10 attached at the gas outlet opening 5 of the working tube 3 .
  • the expansion nozzle 10 has on its underside, so at the rf plasma 7 facing side a convergent inlet 11. By this narrowing become the charge carriers in the plasma 7 up to the outlet opening 15 always accelerated further.
  • the rf plasma 7 then passes as a plasma jet 8 through the outlet opening 15 of the expansion nozzle 10 in the working space 9 a.
  • the outlet 12 of the expansion nozzle 10 is shown in the present illustration as a divergent outlet. However, it is also any other outlet form, e.g. a free outlet possible.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)
EP02017831A 2001-08-16 2002-08-08 Procédé de soudage par plasma Withdrawn EP1284589A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10140298 2001-08-16
DE10140298A DE10140298B4 (de) 2001-08-16 2001-08-16 Verfahren zum Plasmaschweißen

Publications (2)

Publication Number Publication Date
EP1284589A2 true EP1284589A2 (fr) 2003-02-19
EP1284589A3 EP1284589A3 (fr) 2007-02-21

Family

ID=7695702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02017831A Withdrawn EP1284589A3 (fr) 2001-08-16 2002-08-08 Procédé de soudage par plasma

Country Status (4)

Country Link
US (1) US6686555B2 (fr)
EP (1) EP1284589A3 (fr)
CA (1) CA2398194C (fr)
DE (1) DE10140298B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103237405A (zh) * 2013-05-14 2013-08-07 哈尔滨工业大学 一体化等离子体发生装置

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10136951B4 (de) * 2001-07-28 2005-05-04 Mtu Aero Engines Gmbh Verfahren zum Laser-Plasma-Hybridschweißen
DE10159152A1 (de) 2001-12-01 2003-06-12 Mtu Aero Engines Gmbh Verfahren zur Gasreinigung
GB0414680D0 (en) * 2004-06-30 2004-08-04 Boc Group Plc Method and apparatus for heating a gas stream
JP2008518784A (ja) * 2004-11-05 2008-06-05 ジーケイエヌ ドライヴライン インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング 焼入れ可能な鋼のプラズマ・タップホール溶接
DE102006019664B4 (de) * 2006-04-27 2017-01-05 Leibniz-Institut für Plasmaforschung und Technologie e.V. Kaltplasma-Handgerät zur Plasma-Behandlung von Oberflächen
US7737383B2 (en) * 2006-08-25 2010-06-15 Thermal Dynamics Corporation Contoured shield orifice for a plasma arc torch
DE102008018589A1 (de) * 2008-04-08 2009-11-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zum Zünden eines Lichtbogens
CN102271452A (zh) * 2010-06-03 2011-12-07 成都阳流科技发展有限公司 一种热等离子体弧焰发生器
CN103237402B (zh) * 2013-05-14 2015-10-21 哈尔滨工业大学 大气等离子体加工装置
CN113365402B (zh) * 2020-03-06 2023-04-07 上海宏澎能源科技有限公司 限制等离子束的装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3280364A (en) * 1963-03-05 1966-10-18 Hitachi Ltd High-frequency discharge plasma generator utilizing an auxiliary flame to start, maintain and stop the main flame
US4665296A (en) * 1984-04-28 1987-05-12 Neturen Co., Ltd. Method of and apparatus for igniting a high-frequency torch to create a high-temperature plasma of high purity
EP0977470A2 (fr) * 1994-03-17 2000-02-02 Fuji Electric Co., Ltd. Procédé et dispositif de génération d'un plasma inductif
DE19835224A1 (de) * 1998-08-05 2000-02-10 Stefan Laure Plasmagenerator

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157407A3 (fr) * 1984-04-04 1986-12-03 General Electric Company Méthode et appareil pour produire un flux de plasma avec un jet de plasma chauffé et chargé
US4982067A (en) * 1988-11-04 1991-01-01 Marantz Daniel Richard Plasma generating apparatus and method
DE4021182A1 (de) * 1990-07-03 1992-01-16 Plasma Technik Ag Vorrichtung zur beschichtung der oberflaeche von gegenstaenden
NO174450C (no) * 1991-12-12 1994-05-04 Kvaerner Eng Anordning ved plasmabrenner for kjemiske prosesser
US5279669A (en) * 1991-12-13 1994-01-18 International Business Machines Corporation Plasma reactor for processing substrates comprising means for inducing electron cyclotron resonance (ECR) and ion cyclotron resonance (ICR) conditions
US5560844A (en) * 1994-05-26 1996-10-01 Universite De Sherbrooke Liquid film stabilized induction plasma torch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3280364A (en) * 1963-03-05 1966-10-18 Hitachi Ltd High-frequency discharge plasma generator utilizing an auxiliary flame to start, maintain and stop the main flame
US4665296A (en) * 1984-04-28 1987-05-12 Neturen Co., Ltd. Method of and apparatus for igniting a high-frequency torch to create a high-temperature plasma of high purity
EP0977470A2 (fr) * 1994-03-17 2000-02-02 Fuji Electric Co., Ltd. Procédé et dispositif de génération d'un plasma inductif
DE19835224A1 (de) * 1998-08-05 2000-02-10 Stefan Laure Plasmagenerator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103237405A (zh) * 2013-05-14 2013-08-07 哈尔滨工业大学 一体化等离子体发生装置

Also Published As

Publication number Publication date
DE10140298A1 (de) 2003-03-13
CA2398194A1 (fr) 2003-02-16
US20030052097A1 (en) 2003-03-20
US6686555B2 (en) 2004-02-03
CA2398194C (fr) 2009-07-14
DE10140298B4 (de) 2005-02-24
EP1284589A3 (fr) 2007-02-21

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