EP3154736A1 - SCHWEIßBRENNER ZUM SCHWEIßEN ODER SCHNEIDBRENNER ZUM SCHNEIDEN MITTELS EINES LICHTBOGENS - Google Patents
SCHWEIßBRENNER ZUM SCHWEIßEN ODER SCHNEIDBRENNER ZUM SCHNEIDEN MITTELS EINES LICHTBOGENSInfo
- Publication number
- EP3154736A1 EP3154736A1 EP15723130.9A EP15723130A EP3154736A1 EP 3154736 A1 EP3154736 A1 EP 3154736A1 EP 15723130 A EP15723130 A EP 15723130A EP 3154736 A1 EP3154736 A1 EP 3154736A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- current
- arc
- arc current
- welding
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0205—Non-consumable electrodes; C-electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0211—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in cutting
- B23K35/0216—Rods, electrodes, wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
- B23K35/327—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C comprising refractory compounds, e.g. carbides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/073—Stabilising the arc
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/29—Supporting devices adapted for making use of shielding means
- B23K9/291—Supporting devices adapted for making use of shielding means the shielding means being a gas
- B23K9/296—Supporting devices adapted for making use of shielding means the shielding means being a gas using non-consumable electrodes
Definitions
- the invention relates to a welding torch for welding or cutting torch for cutting by means of an arc with a non-consumable electrode, wherein the electrode is adapted to be energized with an arc current.
- the invention further relates to a method for welding or cutting by means of a low-current arc, an electrode for a welding torch for welding or for a cutting torch for cutting by means of an arc, as well as uses of such an electrode for a welding torch for welding or for a cutting torch for cutting.
- Arc current source connected.
- an arc can burn between the electrode and the workpiece.
- Arcs can be described using a static arc curve. This arc characteristic results from the arc voltage as a function of the arc current. At low arc current (up to about 70 A), this arc characteristic shows a strongly decreasing characteristic. This area is commonly referred to as the Ayrton area. In this area, however, it is difficult or impossible to set a stable operating point. In conventional Sch gutt. Cutting torches can thus hardly operate a stable arc in this range of low arc current. With increasing
- Arc current strength shows the arc characteristic an increasing character and it can be set stable operating points. Thus, a stable arc can be operated.
- welding or cutting torches for example for the welding of thin sheets, of foils, for the joining of micro-components (for example in the electronics industry), for plasma cutting or for thermal spraying, it can However, prove necessary that even at low arc currents stable arcs can be operated.
- the invention is therefore based on the object to be able to set a stable arc in a welding torch for welding or a cutting torch for cutting even at low arc currents.
- the electrode of the welding torch for welding and the cutting torch for cutting is adapted to be energized with an arc current.
- the electrode is electrically connected to a corresponding arc current source. Furthermore, a workpiece to be welded or a workpiece to be cut is electrically connected to the arc current source. Thus, the arc between the electrode and the workpiece can burn.
- the electrode is used in particular as a cathode, the workpiece as the anode.
- the invention relates to four different aspects which, however, produce the same effects and lead to the same results. All four aspects thus individually solve the underlying task.
- the electrode has a groove area (tapering area). In this groove region, the electrode has a smaller diameter than in the regions of the electrode adjoining this groove region in the axial direction.
- the groove area itself extends in particular along the axial extent of the electrode.
- the electrode is in particular substantially cylindrical
- the diameter of the electrode within the groove area is particularly constant along the axial extent of the electrode.
- the groove area is thus in particular cylindrical.
- the diameter of the electrode within the groove area may also vary.
- the groove portion may also have any convenient form.
- the groove region has a shape of two truncated cones arranged one above the other, these truncated cones propagating in the direction of the respective region of the electrode adjoining the groove region.
- the electrode has a
- the poor or non-conductive material is in particular a thermally poor or thermally non-conductive material.
- this material has a comparatively low thermal conductivity compared to the electrode material.
- the poor or non-conductive material is formed as an electrically poor or electrically non-conductive material. That bad or not conductive
- Material is thus introduced into the electrode as a thermal and / or electrical insulator.
- ceramic is used as a poor or non-conductive material.
- the poor or non-conductive material is referred to as insulator for the sake of simplicity.
- the insulator is constantly distributed, in particular in the direction of the axial extent of the electrode.
- the insulator has in the direction of the axial extent in particular constant dimensions.
- Cross-sectional area formed by the insulator is in particular a
- the insulator is designed as a circular ring.
- the outer diameter of this annulus corresponds to the diameter of the electrode, the inner diameter of the annulus is in particular constant along the axial extent of the electrode.
- the insulator also has a positive influence on a mechanical stability of the electrode.
- the electrode is arranged between two current contact points with a heating current independent of the
- Arc current to be energized Arc current to be energized.
- the two current contact points are arranged on the electrode itself.
- the heating current is thus at a first
- the heating current is not conducted from the electrode to other elements (such as the workpiece or elements of the welding or cutting torch).
- the heating current is
- the welding or cutting torch has for this purpose in particular an expedient
- a fourth aspect of the invention relates to a welding torch or
- Cutting torch which is designed as a plasma welding torch for plasma welding or as a plasma cutting torch for plasma cutting.
- Plasma welding or plasma cutting torch are adapted to be energized with a pilot arc current.
- the pilot arc current is in
- Plasma cutting torch has for this purpose a convenient adjusting device for adjusting the pilot arc current.
- Centrifugal gas supplied which is ionized by the high temperature and the high energy of the arc (at least partially).
- the arc thus creates a plasma.
- argon or a gas mixture of argon with proportions of hydrogen or helium is used as plasma gas.
- an external gas is supplied, which acts as a protective gas.
- a plasma gas nozzle as a further element of the plasma welding or.
- Plasma cutting torch powered with the pilot arc current.
- a pilot arc (or auxiliary arc) can be ignited between the electrode (as the cathode) and this further element (as the anode).
- This pilot arc is a so-called non-transmitting arc.
- the arc (or main arc) between the electrode and the workpiece can be ignited.
- the arc or main arc is a transmitting
- the invention is particularly suitable for build-up welding, welding or soldering of one, two or more workpieces of metallic materials, in particular by means of tungsten inert gas welding and plasma welding. Furthermore, the invention is particularly suitable for the thermal separation of workpieces made of metallic materials, in particular by means of plasma cutting.
- the invention is also suitable for thermal spraying, in particular for arc spraying and plasma spraying.
- plasma spraying a plasma is generated by the arc analogous to plasma welding. This plasma flows in the form of a plasma jet in the direction of the (to be coated) workpiece.
- a powder is introduced, which is melted by the temperature of the plasma. The plasma jet entrains the molten powder, thereby conveying the molten powder in the direction of the workpiece.
- the effect is achieved that the arc stably attaches to the electrode and even at low
- the temperature of the electrode is specifically influenced, controlled and / or adjusted.
- the invention achieves heat stabilization of the electrode.
- the temperature or temperature distribution of the electrode is particularly dependent on the geometry of the electrode and a cooling of the welding or cutting torch.
- the temperature or temperature distribution of the electrode determines how electrons are emitted from the electrode.
- electrons can be emitted from the electrode by means of field emission through electromagnetic fields. This type of electron emission leads to unstable arcs.
- electrons can be emitted by thermal emission due to the temperature of the electrode. By thermal emission, electrons can easily leave the electrode and pass into the workpiece. By thermal emission, the arc can stably attach to the electrode and burn stable.
- Electrode targeted and increased. This ensures that the arc stably attaches to the electrode and even at lower
- each of the four aspects of the invention enables a safe ignition of the arc.
- the ignition voltage so the value of the arc voltage, which is needed to ignite the arc can be reduced.
- a risk of influencing peripheral devices can be reduced.
- Arc current strengths (especially at arc currents of less than about 70 A) a stable arc can be adjusted.
- the invention is therefore particularly suitable for applications of welding or cutting torches, in which it is necessary that even at low arc current strengths stable arcs are operated, for example, in the welding of thin sheets of films, in the joining of micro-components (for example, in the electronics industry), plasma cutting or thermal spraying. Due to the increased stability of the arc and thus the stability of the arc.
- Cutting process is optimally loaded.
- wear of the electrode can be reduced and a lifetime of the electrode can be increased.
- a lifetime of the electrode can be increased.
- Breaking the welding or cutting process can be avoided. Costs for the welding or cutting process can be reduced. Furthermore, a high directional stability of the arc is ensured. Thus, in particular a secure melting of two sheet edges is possible.
- Warmed electrode tip or reduced heat dissipation is to be understood as meaning the region of the electrode between the groove region and an arc-side end of the electrode, to which the arc at the electrode attaches.
- the electrode and in particular the electrode tip are heated by the arc current and the arc. Due to the groove area, heat can not be dissipated so easily from the electrode tip into the remaining electrode or to other elements of the welding or cutting torch.
- the temperature distribution in the electrode in particular based on the geometry of the groove region, can be influenced substantially independently of the arc current intensity and the thermal emission of the electrode can be increased.
- an electrode tip is heated by the insulation region in the course of the second aspect of the invention or a heat dissipation is reduced.
- the electrode tip is to be understood as meaning the region of the electrode between the insulation region and the arc-side end of the electrode.
- the electrode Due to the heating current, the electrode is "externally heated” in the third aspect.
- the heating current thus results in resistance heating of the electrode. Due to the current flow due to the heating current and due to the electrical resistance of the electrode, heating of the electrode takes place.
- the generated Joule heat is proportional to the converted electrical power and a corresponding period of time.
- the generated heat and thus the heating of the electrode are freely adjustable.
- the heating current heats the electrode in addition to the arc current and the arc. Thus, the temperature distribution in the electrode is affected regardless of the arc current intensity and increases the thermal emission of the electrode.
- the electrode can be heated by the heating current without an arc burning.
- a cold electrode can thus be preheated and a safe ignition of the arc without a high ignition voltage can be made possible.
- the heating current or the heating current intensity is set as a function of the arc current intensity.
- the heating current is reduced when the arc current is increased.
- the pilot arc current is adjusted to the arc current.
- the pilot arc is mostly used only for igniting the arc and then off. In the course of the invention, however, the pilot arc is maintained even when the arc is burning. Through the pilot arc is the
- Temperature distribution in the electrode is affected regardless of the arc current intensity and increases the thermal emission of the electrode.
- the groove area and / or the insulation area are comparatively close to the arc-side end of the electrode in relation to the axial one
- the groove area and / or the isolation area are at a certain distance from the
- this particular distance is in particular a maximum of 20% of the axial extent of the energized region of the electrode.
- the particular distance is in particular between 1 mm and 5 mm.
- the entire cross-sectional area of the electrode is in the
- Insulation region formed from the poorly conductive or non-conductive material (or from the insulator).
- the insulator is arranged, in particular from the arc-side end of the electrode, behind the electrical connection from the electrode to the arc current source.
- the arc current can flow unhindered across the arc between the electrode and the workpiece to be welded or cut. Due to the lowest possible heat dissipation, the temperature of the electrode tip can be increased as much as possible simultaneously.
- the electrode is connected at two current contact points with a Schustromquelle for energizing the heating current.
- the heating current source can be present in addition to the arc current source.
- the heating current source and the arc current source may also be formed as a common power source independently providing the heating current and the arc current.
- the positions of the two current contact points on the electrode can be changed.
- the distance of the two current contact points on the electrode to each other can be changed. This distance determines a second free length of the electrode in which the heating current flows.
- the heating of the electrode can be adjusted by means of this second free length.
- Joule heat is adjusted by means of the current intensity / of the heating current and by means of the second free length l 2 .
- Joule heat is the heat energy per time, which is due to continuous losses of
- Resistive lining (electrical resistance of the conductor based on its length) is formed.
- the electrode is preferably formed from pure tungsten or tungsten with dopants (for example cerium, thorium, lanthanum and / or other rare earths). Such electrodes are particularly suitable for tungsten inert gas welding and plasma welding. More preferably, the electrode is formed of hafnium, zirconium and / or tantalum. Such electrodes are particularly suitable for plasma cutting. An electrode made of tungsten with doping of rare earths is particularly suitable. In particular, these rare earth dopants are present as oxides in a mixture with tungsten.
- dopants for example cerium, thorium, lanthanum and / or other rare earths.
- the welding or cutting torch has a temperature sensor which is adapted to determine a temperature of the electrode. Furthermore is the welding or cutting torch or the Schustromquelle adapted to adjust the heating current or a current intensity of the heating current.
- a suitable Schustrom-adjusting device may be present.
- the heating current is preferably set as a function of the measured temperature of the electrode.
- the temperature of the electrode can be controlled and controlled by means of the heating current.
- the pilot arc current is increased as the arc current is reduced.
- the pilot arc is thus operated with an increased pilot arc current.
- the arc can thus be stabilized more strongly by means of the pilot arc.
- the pilot arc current is reduced as the arc current is increased. Since the arc can burn stably at higher arc currents due to the arc curve, the pilot arc can be operated at higher arc currents with increasingly less pilot arc current. Preferably, the pilot arc current is reduced when the arc current reaches a first limit. This first limit is preferably 100 A.
- the pilot arc current is reduced. More preferably, the pilot arc current is switched off when the arc current reaches a second limit or
- This second limit value is preferably 200 A. From this second limit value, the arc burns sufficiently stable that the pilot arc can be switched off. If the arc current intensity falls below the second limit again, the pilot arc current can be switched on again and increased consecutively with decreasing arc current.
- the heating current is set in dependence on the arc current.
- the electrode is energized with the heating current before the arc is ignited, in particular before the electrode is energized with the arc current.
- the electrode is thus by means of the heating current to a convenient
- Arc voltage value which is needed to ignite the arc, reduced.
- Arc can not be safely ignited, this can lead to significant wear of the electrode, which in turn can lead to misfires, process failures or errors in the welded or cut workpiece and thus to increased costs.
- the invention further relates to a method for welding or cutting, an electrode for a welding torch for welding or a cutting torch for cutting, as well as uses of such an electrode for a welding torch for welding or for a cutting torch for cutting.
- Figure 1 shows schematically a preferred embodiment of a welding torch for welding according to a first preferred aspect of the invention.
- Figure 2 shows schematically a preferred embodiment of a welding torch according to the invention for welding according to a second preferred aspect of the invention.
- Figure 3 shows schematically a preferred embodiment of a welding torch according to the invention for welding according to a third preferred aspect of the invention.
- Figure 4 shows schematically a preferred embodiment of a welding torch according to the invention for welding according to a fourth preferred aspect of the invention.
- Welding torch according to the invention for welding schematically shown and designated 100, 200, 300 and 400 respectively.
- the respective welding torch 100, 200, 300 and 400 each have a preferred embodiment of an electrode 10, 20, 30 or 40 according to the invention.
- the welding torches 100, 200, 300 and 400 are each configured to perform a preferred embodiment of a method according to the invention.
- the welding torches 100, 200 and 300 in FIGS. 1, 2 and 3 are in this example each designed as a tungsten inert gas welding torch for tungsten inert gas welding.
- the welding torch 400 is as a
- Plasma welding torch designed for plasma welding.
- a first workpiece 151 is welded to a second workpiece 152 by a joining operation.
- Workpieces 151 and 152 and the electrodes 10, 20, 30 and 40 are provided with a
- Arc current source 140 electrically connected.
- the electrode 10, 20, 30 or 40 is thus energized with an arc current.
- the electrode 10, 20, 30 or 40 is used in particular as the cathode and the workpieces 151 and 152 as the anode.
- An arc 120 burns between the electrode 10, 20, 30 or 40 and the
- the welding torch 100 further comprises a protective gas nozzle 130 to the
- the welding torch 100 and the electrode 10 in Figure 1 are according to a
- the electrode 10 is formed in this example of tungsten with a rare earth doping.
- the electrode 10 has a groove region 11.
- the groove region 11 extends in the form of a radial recess in the axial direction of the electrode 10. Within this groove region, the electrode has a diameter 12.
- the diameter 12 is constant in the axial extent of the electrode.
- the electrode 10 has a diameter 13, which is for example between 1, 0 and 6.4 mm.
- the groove area 1 1 thus has a smaller diameter 12 than in the regions adjacent to the groove area 1 1 a and 1 1 b.
- An electrode tip 14 is to be understood below as the region of the electrode 10 between the groove region 1 1 and an arc-side end 15 of the electrode 10. At this arc-side end 15 of the electrode, the arc 120 starts at the electrode 10.
- the electrode 10 tapers conically to the
- the groove portion 1 1 is arranged comparatively close to the arc-side end 15 of the electrode 10.
- An axial extent of the electrode tip 14 and thus a distance between the groove area 11 and the arc-side end 15 is in this case in particular at most 20% of the axial extent of an energized area 18 of the electrode 10.
- This energized area 18 of the electrode 10 is the area between the arc-side end 15 and a current transfer point 17 at which the arc current is transferred to the electrode 10.
- the axial extent of the electrode tip 14 and the distance between the groove portion 1 1 and arc-side end 15 is for example between 1 mm and 5 mm.
- a heat dissipation from the electrode tip 1 can be reduced and the resistance heating can be increased.
- the temperature within the electrode tip 14 is increased and the temperature distribution within the electrode 10 is affected. Furthermore, thus a thermal emission of electrons is increased. Due to the elevated temperature within the electrode tip 14, electrons can be
- Electrons are indicated in FIG. 1 by reference numeral 16.
- the thermal emission of electrons 16 Due to the increased thermal emission of electrons 16 it is achieved that the arc 120 stably attaches to the electrode 10 and burns stable.
- the thermal emission of electrons 16 is in turn increased by increasing the temperature in the electrode tip 14 and by influencing the temperature distribution within the electrode 10. Furthermore, the thermal emission of electrons 16 is increased by the increased resistance heating and the reduced heat dissipation.
- the welding torch 200 and the electrode 20 in Figure 2 are according to a
- the electrode 20 has an insulation region 21.
- the isolation region 21 extends in axial extent of the electrode 20. In this example, the isolation region 21 extends over the entire cross-sectional area of the electrode 20.
- the isolation region 21 thus has a diameter 22 which is identical to a diameter 23 of the electrode 20 in one the isolation region 21 adjacent region 21a and 21b of the electrode 20 is.
- the diameter 22 is constant along the axial extent of the electrode 20.
- the isolation region 21 may for example also be formed as a circular ring. The circular ring has a positive influence on the mechanical stability of the electrode 20.
- the insulation region 21 is formed of a material which is electrically and thermally poorly conductive, in this example of ceramic.
- the remaining regions of the electrode 20 are formed in this example of tungsten with a rare earth doping.
- An electrode tip 24 is to be understood below as the region of the electrode 20 between the insulation region 21 and the arc-side end 25 of the electrode 20.
- the arc current is conducted to the electrode 20 within the electrode tip 24.
- Insulation region 1 1 and arc-side end 25 is for example 1 mm to 5 mm analogous to the groove portion 11 is through the isolation region 21 a
- Temperature within the electrode tip 24 increases and affects the temperature distribution within the electrode 20. Furthermore, thus, a thermal emission of electrons 26 is increased. Analogous to the groove area 1 is also by the
- Insulation region reaches that the arc 120 stably attaches to the electrode 20 and burns stable.
- the welding torch 300 and the electrode 30 in FIG. 3 are according to FIG.
- the electrode 30 is formed in this example of tungsten with a rare earth doping.
- the electrode 30 is in addition to the arc current source 140 with a
- a first current contact point 32a on the electrode 30 is electrically connected to a first pole of the heating current source 31, and a second current contact point 32b on the electrode 30 is electrically connected to a second pole of the heating current source 31.
- a Wienstrom-adjusting device 33 is adapted to adjust the heating current and in particular to regulate the Schustromch.
- a temperature sensor 34 is provided, by means of which the temperature of the electrode 30 is determined.
- the heating current setting device 33 is in particular configured to set the heating current as a function of the temperature of the electrode 30.
- the temperature sensor 34 transmits the specific temperature of the electrode 30 to the Schustrom-adjusting device 33 for this purpose.
- the heating current increases or influences the temperature and the temperature distribution within the electrode 30.
- the temperature is set by the Wienstrom-adjusting device 33 to predetermined values. Due to the elevated temperature within the electrode 30 and the influence of the temperature distribution within the electrode 30, the thermal emission of electrons 36 is increased. Due to the increased thermal emission of electrons 36 it is achieved that the arc 120 stably attaches to the electrode 30 and burns stable.
- the welding torch 400 and the electrode 40 in FIG. 4 are according to FIG.
- the welding torch 400 is designed as a plasma welding torch.
- the electrode 40 is formed in this example of tungsten with a rare earth doping.
- the welding torch 400 has a plasma gas nozzle 410.
- Plasma gas nozzle 410 is a plasma gas in the direction of the workpiece 151,
- argon, 420 supplied in the form of a plasma gas flow.
- This plasma gas is ionized by the heat of the arc 120 and forms a plasma arc 430 toward the workpiece 151.
- the electrode 40 and the plasma gas nozzle 410 are electrically connected to a pilot arc current source 41.
- the electrode 40 becomes in addition to the
- Arc current supplied with a pilot arc current Arc current supplied with a pilot arc current.
- a pilot arc current adjusting means 43 is arranged to control the pilot arc current
- the pilot arc current is adjusted as a function of the arc current.
- the pilot arc current thus also influences the temperature distribution in the electrode 40.
- the temperature distribution stabilizes the arc 120.
- a temperature sensor 45 may be provided.
- the pilot arc current adjusting device 43 may be configured to adjust the pilot arc current depending on the temperature of the electrode 40 determined by this temperature sensor 45.
- the electrode 40 is energized with the pilot arc current, as long as the
- Arc current is less than 200 A.
- the pilot arc current is continuously increased as the arc current decreases.
- the arc 120 stably attaches to the electrode 40 even at low arc current levels and burns stable.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Plasma Technology (AREA)
- Arc Welding In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014008867.7A DE102014008867A1 (de) | 2014-06-16 | 2014-06-16 | Schweißbrenner zum Schweißen oder Schneidbrenner zum Schneiden mittels eines Lichtbogens |
EP14002374.8A EP2957373A1 (de) | 2014-06-16 | 2014-07-10 | Schweißbrenner zum Schweißen oder Schneidbrenner zum Schneiden mittels eines Lichtbogens |
PCT/EP2015/001024 WO2015192934A1 (de) | 2014-06-16 | 2015-05-19 | SCHWEIßBRENNER ZUM SCHWEIßEN ODER SCHNEIDBRENNER ZUM SCHNEIDEN MITTELS EINES LICHTBOGENS |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3154736A1 true EP3154736A1 (de) | 2017-04-19 |
Family
ID=51178611
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14002374.8A Withdrawn EP2957373A1 (de) | 2014-06-16 | 2014-07-10 | Schweißbrenner zum Schweißen oder Schneidbrenner zum Schneiden mittels eines Lichtbogens |
EP15723130.9A Withdrawn EP3154736A1 (de) | 2014-06-16 | 2015-05-19 | SCHWEIßBRENNER ZUM SCHWEIßEN ODER SCHNEIDBRENNER ZUM SCHNEIDEN MITTELS EINES LICHTBOGENS |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14002374.8A Withdrawn EP2957373A1 (de) | 2014-06-16 | 2014-07-10 | Schweißbrenner zum Schweißen oder Schneidbrenner zum Schneiden mittels eines Lichtbogens |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP2957373A1 (de) |
DE (1) | DE102014008867A1 (de) |
WO (1) | WO2015192934A1 (de) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1217533A (en) * | 1984-02-02 | 1987-02-03 | Westinghouse Electric Corporation | Method and apparatus for arc welding using preheated electrode |
JPS61108492A (ja) * | 1984-11-01 | 1986-05-27 | Toyota Motor Corp | 電極用アルミナ繊維強化銅複合材料 |
JPH0331507Y2 (de) * | 1986-03-19 | 1991-07-04 | ||
US5670072A (en) * | 1994-04-22 | 1997-09-23 | General Electric Company | Method and apparatus for joining metal components with mitigation of residual stresses |
US5527441A (en) * | 1994-05-04 | 1996-06-18 | General Electric Company | Welding electrode with flat blade |
JP3137985B2 (ja) * | 1994-04-22 | 2001-02-26 | ゼネラル・エレクトリック・カンパニイ | 高いトーチ走行速度を用いて溶接金属部品における残留応力を緩和する方法 |
US5866869A (en) * | 1997-02-24 | 1999-02-02 | Illinois Tool Works Inc. | Plasma pilot arc control |
US6429400B1 (en) * | 1997-12-03 | 2002-08-06 | Matsushita Electric Works Ltd. | Plasma processing apparatus and method |
JP3906590B2 (ja) * | 1998-12-09 | 2007-04-18 | 松下電器産業株式会社 | Tig溶接装置 |
JP5901111B2 (ja) * | 2010-10-07 | 2016-04-06 | 大陽日酸株式会社 | 溶接ガス及びプラズマ溶接方法 |
DE102010053721B4 (de) * | 2010-11-30 | 2014-05-15 | Kjellberg Stiftung - Rechtsfähige Stiftung des bürgerlichen Rechts | Brenner für das Wolfram-Inertgas-Schweißen sowie Elektrode zur Verwendung bei einem solchen Brenner |
-
2014
- 2014-06-16 DE DE102014008867.7A patent/DE102014008867A1/de not_active Withdrawn
- 2014-07-10 EP EP14002374.8A patent/EP2957373A1/de not_active Withdrawn
-
2015
- 2015-05-19 EP EP15723130.9A patent/EP3154736A1/de not_active Withdrawn
- 2015-05-19 WO PCT/EP2015/001024 patent/WO2015192934A1/de active Application Filing
Also Published As
Publication number | Publication date |
---|---|
DE102014008867A1 (de) | 2015-12-17 |
WO2015192934A1 (de) | 2015-12-23 |
EP2957373A1 (de) | 2015-12-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2025368C3 (de) | Elektrischer Lichtbogenbrenner | |
EP2191925B1 (de) | Verfahren, Vorrichtung und Computerprogram zum Plasma-Stichlochschweißen mit aktiver Veränderung des Durchdringungsstroms während des Schweissens | |
EP0372500A2 (de) | Plasmalichtbogenschweissvorrichtung | |
EP2810733B1 (de) | Verfahren zum Metallschutzgasschweißen | |
EP2829349B1 (de) | Schweißbrenner und Schweißgerät mit Hohlelektrode und potentialfrei zugeführtem Schweißzusatzwerkstoff, Schweißverfahren und Verwendung eines Prozessgases | |
DE2416422A1 (de) | Verfahren und vorrichtung zum lichtbogenschweissen | |
EP3116675A1 (de) | Verfahren zum wolfram-inertgasschweissen | |
DE3328777C2 (de) | ||
EP2667689B1 (de) | Elektrode für Plasmaschneidbrenner sowie deren Verwendung | |
DE3426410A1 (de) | Schweissbrenner zum plasma-mig-schweissen | |
EP2457681A1 (de) | Brenner für das Wolfram-Inertgas-Schweißen sowie Elektrode zur Verwendung bei einem solchen Brenner | |
DE102015001457A1 (de) | Verfahren zum Schweißen oder Schneiden mittels eines Lichtbogens | |
WO2015192934A1 (de) | SCHWEIßBRENNER ZUM SCHWEIßEN ODER SCHNEIDBRENNER ZUM SCHNEIDEN MITTELS EINES LICHTBOGENS | |
DE837430C (de) | Elektrode fuer die Lichtbogenschweissung in einem inerten Gas und Verfahren zu ihrerHerstellung | |
EP1974845B1 (de) | Verfahren zum manuellen Zünden eines Löt- oder Schweißlichtbogens | |
DE102008028166B4 (de) | Vorrichtung zur Erzeugung eines Plasma-Jets | |
DE2513090C2 (de) | Verfahren zum Plasma- MIG-Schweißen | |
EP3385618B1 (de) | Verfahren zum flammrichten und verwendung einer brenneranordnung hierfür | |
DE2459309A1 (de) | Verfahren zum zuenden eines lichtbogens beim lichtbogenschweissen | |
DE2162024C3 (de) | Vorrichtung zur Plasmaerzeugung | |
DE202016004798U1 (de) | Warmdrahtschweissbaugruppe für tiefe und schmale ausgesparte Spalte | |
DE102014013047A1 (de) | Schweißbrenner und Schweißverfahren mit ringförmiger Elektrodenanordnung | |
DE2334470C3 (de) | Vorrichtung zum Lichtbogen-Auftragsschweißen mit zwei Elektroden | |
WO2016124335A1 (de) | Verfahren zum schweissen oder schneiden mittels eines lichtbogens | |
EP2529873B1 (de) | Lichtbogenprozesssteuereinheit zur Steuerung der Lichtbogenstromstärke bei Pulsschweissen unter Schutzgas; Verfahren zum Pulsschweissen unter solcher Prozesssteuerung |
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 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20161216 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: LINDE GMBH |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20201201 |