US20020033386A1 - Device with a plasma torch - Google Patents
Device with a plasma torch Download PDFInfo
- Publication number
- US20020033386A1 US20020033386A1 US09/883,412 US88341201A US2002033386A1 US 20020033386 A1 US20020033386 A1 US 20020033386A1 US 88341201 A US88341201 A US 88341201A US 2002033386 A1 US2002033386 A1 US 2002033386A1
- Authority
- US
- United States
- Prior art keywords
- electrode
- nozzle
- connection
- voltage source
- pole
- 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.)
- Granted
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
- H05H1/44—Plasma torches using an arc using more than one torch
Definitions
- the invention relates to a device according to the preamble of claim 1 .
- a device of the kind mentioned above with merely one rod-shaped electrode is used for the welding of light metal and light metal alloys.
- the rod-shaped electrode is switched as a cathode and helium is used as a plasma gas.
- a very hot plasma is obtained which evaporates thin oxide layers. This is not the case in all light metal alloys, however.
- the workpiece to be worked can appropriately be switched as the counterelectrode. It is also possible to make the nozzle or the respective nozzle body from an electrically conductive material and to switch the same as a counterelectrode.
- both electrodes can also be switched as cathodes. This leads to the advantage that the required welding energy can be divided among both electrodes and they can therefore be provided with a thinner arrangement. This allows the production of very narrow receiving means of 9 mm width for example. With such devices it is therefore also possible to weld in corner zones of workpieces which are difficult to access, which substantially facilitates the constructional design of such pieces.
- each plasma arc can be made by means of a high-frequency pulse when the level of the voltage of the individual voltage pulses does not exceed the respective breakdown voltage of the path between the electrode and the respective counterelectrode.
- the ignition can also be initiated per se by respectively high voltage pulses which exceed the respective breakdown voltage.
- the measures according to claim 6 allow achieving an ionization of the plasma gas flowing from the nozzle in the zone between the electrode and the nozzle as a result of a high-frequency arc-over and, as a result, the ignition of an arc between the electrode and the workpiece as a result of the applied direct voltage. This leads to a substantial protection of the plasma torch, because the same is not encumbered by the otherwise common pilot arc.
- FIG. 1 shows a sectional view through a first embodiment of the device in accordance with the invention
- FIG. 2 shows a cross-sectional view through the device according to FIG. 1;
- FIG. 3 shows a sectional view through a second embodiment of the device in accordance with the invention.
- FIG. 4 shows a top view of the device according to FIG. 3;
- FIGS. 5 and 6 show a device according to FIGS. 3 and 4 with a power supply unit, shown in a partial sectional view, in a projection and top view;
- FIG. 7 shows a detail of the nozzle area
- FIG. 8 schematically shows the electric power supply of the device
- FIG. 9 shows a diagram of the progress over time of the voltage charging of the electrodes of a device in accordance with the invention.
- FIG. 10 shows a variant of the embodiment according to FIGS. 1 and 2 in a sectional view.
- a receiver 1 is provided in the embodiment according to FIGS. 1 and 2, which receiver is made from an electrically insulating material.
- Two holding devices 2 are inserted in said receiver 1 , at the end of which there are two electrodes 3 , 4 made of a thermally stable material such as tungsten for example.
- the holding devices 2 are made of an electrically well-conducting material and are provided with a central bore 5 which are connected in the upper and lower range via radial bores 6 with chambers 7 , 8 , of which the chambers 7 are each connected with a gas conduit 109 , 109 ′ through which plasma gas can be supplied separately, and the chambers 9 are each connected with an ejection nozzle 9 , 9 ′.
- Said nozzles 9 , 9 ′ are provided with conical inner walls, with the inner wall of nozzle 9 extending substantially parallel to the conical end zone of electrode 3 , whereby the free end of the electrode 3 can be flattened.
- the electrode 5 is provided with a substantially blunt arrangement in contrast to electrode 3 .
- a cooling conduit 10 is further provided in the receiver 1 , which conduit leads from an inlet 11 to an annular chamber 12 which is penetrated by holding device 2 of the electrode 4 , and from the same, divided into two branch conduits (FIG. 2), to a further annular chamber 13 which is penetrated by the holding device 2 of the electrode 3 and from the same to an outlet 14 .
- the electric connection of the two electrodes 3 , 4 or their holding devices 2 can be provided through screw caps 15 , or if the gas conduits 109 , 109 ′ are provided with electrically conducting walls, via the same. In the latter case the connection can be made through connecting nipples through which gas is supplied.
- a tubular guide means 16 is provided between the nozzles 9 , 9 ′, which guide means is provided for guiding a wire used as an additional material.
- the guide means 16 is offset.
- the receiver 1 can be provided with a very narrow arrangement.
- the electrode 3 extends in the position for use of the receiver 1 in a substantially vertical manner and the electrode 4 encloses with the same an acute angle which can usually be 20° to 70°.
- Two similar electrodes 3 are provided in the embodiment according to FIGS. 3 and 4, which electrodes both enclose an angle with the perpendicular.
- the receiver 1 is provided with flange-like projections 16 which are penetrated by screws 17 with which the receiver 1 can be fastened to a connecting head 18 , with the screws 17 engaging in threaded bores 19 of the connecting head 18 .
- Spring-biased connecting nipples 30 are held axially displaceable in said connecting head 18 , to which a water supply line 21 and a water discharge line 22 for supplying and discharging cooling water are connected, with said spring-biased connecting nipples 20 engaging, when the receiver 1 is closed, in the inlet and outlet 11 , 14 of the same.
- Fixed connecting nipples 23 are further provided in said connecting head 18 to which gas lines 24 are connected which convey helium for example.
- the fixed connecting nipples 23 engage in the inlets 25 of the gas conduits 109 , 109 ′ when the receiver 1 is closed. O-rings are used for sealing in the inlets 25 , as in the inlet and outlet 11 , 14 .
- a pin 26 which is arranged off-center is held in the connecting head 18 , which pin engages in a respective bore 27 of a receiver 1 . This ensures that a connection of a receiver 1 to the connecting head is only possible in a certain position in which the correct flow of the gas and cooling conduits is given.
- Receivers 1 which are equipped with different electrodes 3 , 4 can be connected to the connecting head 18 . Such an exchange can be performed very simply.
- FIG. 7 shows a detail of the nozzle body 9 for an electrode 3 which is provided with a conical or substantially tapered end.
- the inner wall 27 of the nozzle body 9 extends substantially parallel to the conical end of electrode 3 . This measure ensures that the plasma gas emerges directed in an inclined manner against the axis of nozzle 9 , therefore counteracting the tendency of the emerging plasma to diverge with increasing distance from the orifice of nozzle 9 owing to friction in the ambient air. As a result, only a small arc spot is obtained in a desired manner on the workpiece to be processed.
- Cold gas conduits 29 are provided in the nozzle body 9 and enclose its conical nozzle bore 28 . Said conduits are evenly distributed concentrically about the nozzle bore 28 .
- the axes of said cold gas conduits 29 most of which are provided in odd numbers such as 3, 5 or 7, form a generatrix of a conical surface whose axis lies concentrically to the axis of the nozzle bore 28 .
- Said cold gas conduits are open towards the chamber 8 and open at the face side of the nozzle body 9 .
- the plasma gas flowing through these cold gas conduits produces a cooling of the nozzle body 9 on the one hand and a further constriction of the plasma emerging from the nozzle 9 on the other hand and thus a reduction of the arc spot and thus an increase in the energy concentration in the same.
- the supply of the chamber 8 with plasma gas is performed through a gas conduit 109 , 109 ′, the upper radial bores 6 of the holder 2 , its central bore 5 and the lower radial bores 6 .
- FIG. 8 schematically shows the connection of the device in accordance with the invention.
- the electrodes 3 , 4 are each connected with a pole of a voltage source 31 , 32 each whose respective second pole is connected via a switching device 33 , 34 each to a workpiece 30 .
- the two switching devices 33 , 34 are mutually locked, so that only one switching device 33 or 34 each can be switched through. Only short switch-through times are provided for the two switching devices 33 , 34 , so that the electrodes 3 , 4 can only be charged in pulses.
- the electrode 3 which is disposed at the back as seen in the welding direction, is switched as a cathode and connected to the minus pole of the voltage source 32 .
- Typical values are a current application of approx. 170 A for a time of approx. 15 ms each and a break of approx. 3 ms. During this time the switching device 33 switches through and the electrode 4 connecting the plus pole of the current source 31 is charged with approx. 250 A for approx. 3 ms.
- FIG. 10 differs from the one of FIGS. 1 and 2 in such a way that helical ribs 35 are arranged in the chambers 8 which are in connection with the gas connections through the gas conduits 109 , 109 ′, with helically extending conduits remaining between said helical ribs through which the plasma gas flows to the nozzles 9 , 9 ′.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Plasma Technology (AREA)
- Arc Welding In General (AREA)
Abstract
Description
- The invention relates to a device according to the preamble of
claim 1. - A device of the kind mentioned above with merely one rod-shaped electrode is used for the welding of light metal and light metal alloys. In order to achieve a high welding speed at deep fusion penetration and narrow seams, the rod-shaped electrode is switched as a cathode and helium is used as a plasma gas. A very hot plasma is obtained which evaporates thin oxide layers. This is not the case in all light metal alloys, however.
- In order to also enable the welding of such alloys, welding is performed with direct current instead of alternating current, or the electrode is applied to the plus pole of the voltage source. Although a continual removal of the oxide layers is ensured and a welded joint is ensured which is free from cavities because the oxide skin is continuously torn open, this advantage is offset by the disadvantage of a welding speed which is reduced by approximately two-thirds as compared with a d.c. helium welding and a considerable increase of the width of the weld seams with an increased heat influence zone.
- It is the object of the present invention to avoid such disadvantages and to provide a method of the kind mentioned above which allows a high welding speed also in difficult alloys and which also ensures that any arising oxide layers are removed.
- This is achieved by a method of the kind mentioned above by the characterizing features of
claim 1. - As a result of the proposed measures it is possible to connect the two rod-shaped electrodes with different poles of the voltage sources. As a result, plasma pulses which are produced with an electrode connected to the plus pole of a voltage source can be used to tear open the oxide layers and with the subsequent plasma pulses which are connected with the minus pole of a voltage source and are therefore produced by an electrode switched as a cathode it is possible to weld the basic material in a clean manner and with a high penetration depth, with very narrow and smooth weld seams being obtained. By locking the switching devices which each only allow voltage pulses of approx. 1 to 5 milliseconds, it is ensured that only one electrode can be charged.
- The workpiece to be worked can appropriately be switched as the counterelectrode. It is also possible to make the nozzle or the respective nozzle body from an electrically conductive material and to switch the same as a counterelectrode.
- In the case of alloys that can be welded more easily, both electrodes can also be switched as cathodes. This leads to the advantage that the required welding energy can be divided among both electrodes and they can therefore be provided with a thinner arrangement. This allows the production of very narrow receiving means of 9 mm width for example. With such devices it is therefore also possible to weld in corner zones of workpieces which are difficult to access, which substantially facilitates the constructional design of such pieces.
- As a result of the two separate voltage sources they can also be controlled with respect to the pulse length and pulse power, thus enabling a highly substantial adaptation to the respective requirements.
- The ignition of each plasma arc can be made by means of a high-frequency pulse when the level of the voltage of the individual voltage pulses does not exceed the respective breakdown voltage of the path between the electrode and the respective counterelectrode. The ignition can also be initiated per se by respectively high voltage pulses which exceed the respective breakdown voltage.
- Very favorable conditions for the welding of very difficult alloys are obtained by the features of
claim 3. It has also proven to be advantageous to also provide the features ofclaim 2, with the electrode switched as a cathode preferably standing perpendicularly to the workpiece. - The features of
claim 4 allow keeping the wear and tear of the electrode, which is connected with the plus pole and is subject to higher stresses, at a very low level. - The features of
claim 5 provide a simple arrangement of the receiving means. It must be ensured however that the higher stressed electrode is cooled sufficiently well. - The measures according to
claim 6 allow achieving an ionization of the plasma gas flowing from the nozzle in the zone between the electrode and the nozzle as a result of a high-frequency arc-over and, as a result, the ignition of an arc between the electrode and the workpiece as a result of the applied direct voltage. This leads to a substantial protection of the plasma torch, because the same is not encumbered by the otherwise common pilot arc. - As a result of the ionization by the high-frequency arc-over, which imposes only very low thermal stresses on the nozzle, it is also possible when using helium as a plasma gas to easily ignite over larger distances between the electrode and workpiece of 10 mm for example.
- The use of a nozzle which is made from an electrically well-conducting material and its connection via a high-resistance electric resistor with the pole of the voltage source which is connected with the workpiece is also of advantage in devices in accordance with the invention in which the plus pole of the voltage source is connected with the electrode penetrating the nozzle.
- The features of
claim 8 allow using the device in a very universal manner. - The features of
claim - The invention is now explained in closer detail by reference to the enclosed drawing, wherein:
- FIG. 1 shows a sectional view through a first embodiment of the device in accordance with the invention;
- FIG. 2 shows a cross-sectional view through the device according to FIG. 1;
- FIG. 3 shows a sectional view through a second embodiment of the device in accordance with the invention;
- FIG. 4 shows a top view of the device according to FIG. 3;
- FIGS. 5 and 6 show a device according to FIGS. 3 and 4 with a power supply unit, shown in a partial sectional view, in a projection and top view;
- FIG. 7 shows a detail of the nozzle area;
- FIG. 8 schematically shows the electric power supply of the device;
- FIG. 9 shows a diagram of the progress over time of the voltage charging of the electrodes of a device in accordance with the invention;
- FIG. 10 shows a variant of the embodiment according to FIGS. 1 and 2 in a sectional view.
- A
receiver 1 is provided in the embodiment according to FIGS. 1 and 2, which receiver is made from an electrically insulating material. Twoholding devices 2 are inserted in saidreceiver 1, at the end of which there are twoelectrodes - The
holding devices 2 are made of an electrically well-conducting material and are provided with acentral bore 5 which are connected in the upper and lower range viaradial bores 6 withchambers chambers 7 are each connected with agas conduit chambers 9 are each connected with anejection nozzle - Said
nozzles nozzle 9 extending substantially parallel to the conical end zone ofelectrode 3, whereby the free end of theelectrode 3 can be flattened. Theelectrode 5 is provided with a substantially blunt arrangement in contrast toelectrode 3. - Furthermore, a
cooling conduit 10 is further provided in thereceiver 1, which conduit leads from aninlet 11 to anannular chamber 12 which is penetrated byholding device 2 of theelectrode 4, and from the same, divided into two branch conduits (FIG. 2), to a furtherannular chamber 13 which is penetrated by theholding device 2 of theelectrode 3 and from the same to anoutlet 14. - The electric connection of the two
electrodes holding devices 2 can be provided throughscrew caps 15, or if thegas conduits - In the embodiment according to FIGS. 1 and 2, a tubular guide means16 is provided between the
nozzles - As can be seen from FIG. 2, the
receiver 1 can be provided with a very narrow arrangement. - In the embodiment according to FIGS. 1 and 2, the
electrode 3 extends in the position for use of thereceiver 1 in a substantially vertical manner and theelectrode 4 encloses with the same an acute angle which can usually be 20° to 70°. - Two
similar electrodes 3 are provided in the embodiment according to FIGS. 3 and 4, which electrodes both enclose an angle with the perpendicular. - As is shown in FIG. 5, the
receiver 1 is provided with flange-like projections 16 which are penetrated byscrews 17 with which thereceiver 1 can be fastened to a connectinghead 18, with thescrews 17 engaging in threadedbores 19 of the connectinghead 18. - Spring-biased connecting
nipples 30 are held axially displaceable in said connectinghead 18, to which awater supply line 21 and a water discharge line 22 for supplying and discharging cooling water are connected, with said spring-biased connectingnipples 20 engaging, when thereceiver 1 is closed, in the inlet andoutlet nipples 23 are further provided in said connectinghead 18 to whichgas lines 24 are connected which convey helium for example. The fixed connectingnipples 23 engage in theinlets 25 of thegas conduits receiver 1 is closed. O-rings are used for sealing in theinlets 25, as in the inlet andoutlet - Furthermore, a
pin 26 which is arranged off-center is held in the connectinghead 18, which pin engages in arespective bore 27 of areceiver 1. This ensures that a connection of areceiver 1 to the connecting head is only possible in a certain position in which the correct flow of the gas and cooling conduits is given. -
Receivers 1 which are equipped withdifferent electrodes head 18. Such an exchange can be performed very simply. - FIG. 7 shows a detail of the
nozzle body 9 for anelectrode 3 which is provided with a conical or substantially tapered end. Theinner wall 27 of thenozzle body 9 extends substantially parallel to the conical end ofelectrode 3. This measure ensures that the plasma gas emerges directed in an inclined manner against the axis ofnozzle 9, therefore counteracting the tendency of the emerging plasma to diverge with increasing distance from the orifice ofnozzle 9 owing to friction in the ambient air. As a result, only a small arc spot is obtained in a desired manner on the workpiece to be processed. -
Cold gas conduits 29 are provided in thenozzle body 9 and enclose its conical nozzle bore 28. Said conduits are evenly distributed concentrically about the nozzle bore 28. The axes of saidcold gas conduits 29, most of which are provided in odd numbers such as 3, 5 or 7, form a generatrix of a conical surface whose axis lies concentrically to the axis of the nozzle bore 28. Said cold gas conduits are open towards thechamber 8 and open at the face side of thenozzle body 9. - The plasma gas flowing through these cold gas conduits produces a cooling of the
nozzle body 9 on the one hand and a further constriction of the plasma emerging from thenozzle 9 on the other hand and thus a reduction of the arc spot and thus an increase in the energy concentration in the same. The supply of thechamber 8 with plasma gas is performed through agas conduit holder 2, itscentral bore 5 and the lower radial bores 6. - FIG. 8 schematically shows the connection of the device in accordance with the invention. The
electrodes voltage source switching device workpiece 30. - The two
switching devices switching device switching devices electrodes - For numerous applications the
electrode 3, which is disposed at the back as seen in the welding direction, is switched as a cathode and connected to the minus pole of thevoltage source 32. - Typical values are a current application of approx. 170 A for a time of approx. 15 ms each and a break of approx. 3 ms. During this time the
switching device 33 switches through and theelectrode 4 connecting the plus pole of thecurrent source 31 is charged with approx. 250 A for approx. 3 ms. - With such a mode of operation it is also possible to favorably and rapidly weld even alloys which are difficult to weld, because by charging the
electrode 4 the plasma pulses thus produced will securely tear open any oxide skins and the basic material can be welded very favorably with the subsequent plasma pulses which are produced by charging theelectrode 3. - For certain applications it is also possible to insert two
electrodes 3 in thereceiver 1 and to connect both with the minus pole of onedirect voltage source 32 each and to charge the same substantially alternatingly. Overlap periods can also be provided, however. Since in this way the stress on eachelectrode 3 is respectively low,electrodes 3 with a small diameter can be used, thus enabling the construction of the receiver with a narrow design. - The embodiment according to FIG. 10 differs from the one of FIGS. 1 and 2 in such a way that
helical ribs 35 are arranged in thechambers 8 which are in connection with the gas connections through thegas conduits nozzles - The same is subjected to a twist which leads to a stabilization of the plasma emerging at a high speed from the
nozzles workpiece 30 to be processed.
Claims (12)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT453/2000U | 2000-06-21 | ||
AT0045300U AT4667U1 (en) | 2000-06-21 | 2000-06-21 | PLASMA TORCH |
ATGM453/2000 | 2000-06-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020033386A1 true US20020033386A1 (en) | 2002-03-21 |
US6410879B1 US6410879B1 (en) | 2002-06-25 |
Family
ID=3491008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/883,412 Expired - Fee Related US6410879B1 (en) | 2000-06-21 | 2001-06-18 | Device with a plasma torch |
Country Status (4)
Country | Link |
---|---|
US (1) | US6410879B1 (en) |
EP (1) | EP1166942B1 (en) |
AT (1) | AT4667U1 (en) |
CA (1) | CA2350977C (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9233432B2 (en) * | 2007-02-12 | 2016-01-12 | Yu Ming Zhang | Arc welder and related system |
CN101434000B (en) * | 2008-12-13 | 2011-03-23 | 东方电气集团东方汽轮机有限公司 | Small-interior diameter deep hole plasma spray welding gun |
US9831070B1 (en) | 2017-06-15 | 2017-11-28 | Enercon Industries Corporation | Surface treater with expansion electrode arrangement |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB691373A (en) * | 1950-04-28 | 1953-05-13 | Gen Electric Co Ltd | Improvements in and relating to processes for electric arc welding and to apparatus for carrying out such processes |
ZA706418B (en) * | 1969-10-01 | 1971-05-27 | British Railways Board | Improvements relating to plasma torches |
JPS5113473B2 (en) * | 1971-11-19 | 1976-04-28 | ||
FR2229493A1 (en) * | 1973-05-16 | 1974-12-13 | Pk Tekhno | Strip welding twin nozzle plasma gun - with opposed alternately pulsed current in either nozzle |
FR2232395B1 (en) * | 1973-06-06 | 1976-05-28 | Soudure Autogene Francaise | |
US3931489A (en) * | 1973-11-05 | 1976-01-06 | Kabel-Und Metallwerke Gutehoffnungshuette Aktiengesellschaft | Multiarc seam welding apparatus for thin metal sheet |
US4119828A (en) * | 1977-02-08 | 1978-10-10 | Vsesojuzny Nauchno-Issledovatelsky Proektno-Konstruktorsky I Tekhnologichesky Institut Elektrosvarochnogo Oborudovania | Method of plasma multiarc welding by permanently burning direct-current arcs |
DE2926210A1 (en) | 1979-06-29 | 1981-02-12 | Maschf Augsburg Nuernberg Ag | Combined arc welding - with plasma arc from tungsten needle partly overlapping consumable electrode arc |
DE4105407A1 (en) * | 1991-02-21 | 1992-08-27 | Plasma Technik Ag | PLASMA SPRAYER FOR SPRAYING SOLID, POWDER-SHAPED OR GAS-SHAPED MATERIAL |
US5798497A (en) * | 1995-02-02 | 1998-08-25 | Battelle Memorial Institute | Tunable, self-powered integrated arc plasma-melter vitrification system for waste treatment and resource recovery |
WO1996039794A1 (en) * | 1995-06-05 | 1996-12-12 | Tohoku Unicom Co., Ltd. | Power supply for multielectrode discharge |
JPH11117845A (en) | 1997-10-11 | 1999-04-27 | Masahide Ichikawa | Multiple ignition pulse generating circuit in internal combustion engine |
US6121571A (en) * | 1999-12-16 | 2000-09-19 | Trusi Technologies Llc | Plasma generator ignition circuit |
-
2000
- 2000-06-21 AT AT0045300U patent/AT4667U1/en not_active IP Right Cessation
-
2001
- 2001-06-18 US US09/883,412 patent/US6410879B1/en not_active Expired - Fee Related
- 2001-06-19 EP EP01890189A patent/EP1166942B1/en not_active Expired - Lifetime
- 2001-06-20 CA CA002350977A patent/CA2350977C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2350977C (en) | 2009-05-12 |
AT4667U1 (en) | 2001-10-25 |
EP1166942B1 (en) | 2006-08-09 |
EP1166942A3 (en) | 2004-01-02 |
EP1166942A2 (en) | 2002-01-02 |
US6410879B1 (en) | 2002-06-25 |
CA2350977A1 (en) | 2001-12-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6215088B1 (en) | Method for the partial fusion of objects | |
US4564740A (en) | Method of generating plasma in a plasma-arc torch and an arrangement for effecting same | |
US2960594A (en) | Plasma flame generator | |
US8921731B2 (en) | Protective nozzle cap, protective nozzle cap retainer, and arc plasma torch having said protective nozzle cap and or said protective nozzle cap retainer | |
US3562486A (en) | Electric arc torches | |
US8575510B2 (en) | Nozzle for a liquid-cooled plasma burner, arrangement thereof with a nozzle cap, and liquid-cooled plasma burner comprising such an arrangement | |
US5109150A (en) | Open-arc plasma wire spray method and apparatus | |
US2468807A (en) | Water-cooled gas blanketed arcwelding torch | |
KR20120117945A (en) | Norzle for a liquid-cooled plasma torch, nozzle cap for a liquid-cooled plasma torch and plasam torch head with same | |
US11865651B2 (en) | Electrodes for gas- and liquid-cooled plasma torches | |
US9073141B2 (en) | Electrode for plasma cutting torches and use of same | |
CA1067584A (en) | Method and torch for sustaining multiple coaxial arcs | |
CA2350977C (en) | A device with a plasma torch | |
KR102443992B1 (en) | TIG welding torch with constriction nozzle for spot welding and nozzle for electrode used therein | |
GB2365810A (en) | Reverse polarity dc plasma arc welding | |
JP7176780B2 (en) | TIG welding torch with narrow nozzle for spot welding | |
CN110891724A (en) | Welding gun | |
KR102306164B1 (en) | Collet module for argon gas welding torch | |
US2951934A (en) | Welding torch | |
JPH0785992A (en) | Multi-electrode plasma jet torch | |
GB2095520A (en) | Plasma arc apparatus | |
JPH01148472A (en) | Plasma jet torch | |
US6215089B1 (en) | Plasma welding torch | |
JPH07227674A (en) | Multielectrode welding method and electrode structure, torch and device for implementing such method | |
CN219818335U (en) | Welding gun |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: INOCON TECHNOLOGIE GES.M.B.H., AUSTRIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHWANKHART, GERHARD;REEL/FRAME:011920/0035 Effective date: 20010514 |
|
FEPP | Fee payment procedure |
Free format text: PAT HOLDER CLAIMS SMALL ENTITY STATUS, ENTITY STATUS SET TO SMALL (ORIGINAL EVENT CODE: LTOS); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20100625 |