CN109454315B - Multi-tungsten electrode argon arc heat source, control method and welding device - Google Patents
Multi-tungsten electrode argon arc heat source, control method and welding device Download PDFInfo
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- CN109454315B CN109454315B CN201811615325.5A CN201811615325A CN109454315B CN 109454315 B CN109454315 B CN 109454315B CN 201811615325 A CN201811615325 A CN 201811615325A CN 109454315 B CN109454315 B CN 109454315B
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- 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
- B23K9/1675—Arc welding or cutting making use of shielding gas and of a non-consumable electrode making use of several electrodes
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- 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
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1087—Arc welding using remote control
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- 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
- B23K9/32—Accessories
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Abstract
The invention provides a multi-tungsten electrode argon arc heat source, a control method and a welding device, and belongs to the technical field of surfacing welding, aiming at the problem that the deposition speed is low due to the fact that the low dilution rate is ensured in the existing tungsten electrode argon arc surfacing welding process. A multi-tungsten electrode argon arc heat source comprises N welding power supplies, N change-over switches, M tungsten electrodes and argon protective gas; n, M are all positive integers greater than or equal to 3; the cathode of each welding power supply is connected with one or more tungsten electrodes, the end faces of M tungsten electrodes are arranged into a linear shape or a surface shape, the distance between two adjacent tungsten electrodes can ensure the transmission of electric arcs, and three adjacent tungsten electrodes are respectively connected with different welding power supplies; m tungsten electrodes are positioned above the base material; the positive electrode of each welding power supply is connected with the base material through a change-over switch; argon shield gas is distributed between the tungsten electrode and the base metal. The welding device comprises the heat source and a welding torch; the M tungsten poles of the heat source are simultaneously disposed within the torch.
Description
Technical Field
The invention relates to a heat source for argon tungsten-arc surfacing, in particular to a multi-argon tungsten-arc heat source, a control method and a welding device, and belongs to the technical field of surfacing.
Background
The surfacing is a process of depositing a material with certain performance on the surface of a weldment to obtain a deposited metal layer with special performances of wear resistance, heat resistance and the like on the surface of the weldment. The surfacing welding can obviously prolong the service life of a weldment, save manufacturing and maintenance cost, shorten repair time and improve productivity, so the surfacing welding is widely applied to manufacturing and maintenance work of various industries.
The argon tungsten-arc surfacing has the advantages of stable electric arc, less splashing, good visibility, easy control of the shape of a surfacing layer and the like, but in order to ensure low dilution rate and small electric arc energy, the deposition speed is not high, and the argon tungsten-arc surfacing is only suitable for small workpieces with high surfacing quality requirements and complex shapes at present.
Disclosure of Invention
The invention provides a multi-tungsten electrode argon arc heat source, a control method and a welding device, aiming at the problem that the deposition speed is low due to the fact that the low dilution rate is ensured in the existing tungsten electrode argon arc surfacing process.
A multi-tungsten electrode argon arc heat source comprises N welding power supplies, N change-over switches, M tungsten electrodes and argon protective gas; n, M are all positive integers greater than or equal to 3;
the cathode of each welding power supply is connected with one or more tungsten electrodes, the end faces of M tungsten electrodes are arranged into a linear shape or a surface shape, the distance between two adjacent tungsten electrodes can ensure the transmission of electric arcs, and three adjacent tungsten electrodes are respectively connected with different welding power supplies; m tungsten electrodes are positioned above the base material;
the positive electrode of each welding power supply is connected with the base material through a change-over switch; argon shield gas is distributed between the tungsten electrode and the base metal.
Preferably, the switch has a set frequency on and off and is capable of passing currents on the order of hundreds of amperes.
Preferably, the welding power supply has steep characteristics.
The invention also provides a heat source control method, which comprises the following steps:
the electric arcs are switched among the M tungsten electrodes by controlling the change-over switch, only one electric arc burns at any time, and a linear heat source or a surface-shaped heat source is obtained.
The invention also provides a welding device, which comprises the heat source and the welding torch;
the M tungsten poles of the heat source are simultaneously disposed within the torch.
The invention has the beneficial effects that the invention is a heat source based on tungsten electrode argon arc, which is implemented by adopting a plurality of tungsten electrodes and can form a line heat source or a surface heat source. The invention has the advantages that a plurality of tungsten electrodes are adopted, the implementation can be realized by using three power supplies at least, the electric arc is switched among the plurality of tungsten electrodes, only one electric arc is burnt at any time, therefore, for each tungsten electrode, the electric arc is burnt in a small part of time, the tungsten electrode is cooled in the rest time, the current bearing capacity of the tungsten electrode is greatly improved, and the electric arc energy can be greatly improved. Because the heat source is a linear heat source or a surface heat source, the energy density of the electric arc is not increased for the base metal, so that the deposition rate can be improved while the dilution rate is ensured, and the problem of low deposition rate of the argon tungsten-arc welding is solved.
Drawings
FIG. 1 is a schematic diagram of a multi-tungsten argon arc heat source according to the present invention;
FIG. 2 is a schematic diagram of six tungsten electrodes arranged in a straight line to form a linear heat source;
FIG. 3 is a schematic view of a surface heat source formed by nine tungsten electrodes;
FIG. 4 is a schematic view of a circular surface heat source formed by six tungsten electrodes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The multi-tungsten electrode argon arc heat source comprises N welding power supplies, N change-over switches, M tungsten electrodes and argon protective gas; n, M are all positive integers greater than or equal to 3;
the cathode of each welding power supply is connected with one or more tungsten electrodes, M tungsten electrodes are arranged and formed, except the first tungsten electrode and the last tungsten electrode, the rest tungsten electrodes are at least two adjacent tungsten electrodes, the distance between every two adjacent tungsten electrodes can ensure the transmission of electric arcs, and the three adjacent tungsten electrodes are respectively connected with different welding power supplies; m tungsten electrodes are positioned above the base material;
the positive electrode of each welding power supply is connected with the base material through a change-over switch; argon shield gas is distributed between the tungsten electrode and the base metal.
In the embodiment, a plurality of tungsten electrodes are arranged to form a heat source, at least three welding power supplies are used for controlling the power supply of the tungsten electrodes, one change-over switch is used for controlling the on-off of a welding loop of one welding power supply, and adjacent three tungsten electrodes are respectively connected with different welding power supplies, for example: electrifying a first tungsten electrode by using a first welding electrode, adding an electric arc between the first tungsten electrode and a base metal, carrying out electric arc combustion on the first tungsten electrode, electrifying a second tungsten electrode adjacent to the first tungsten electrode by using a second welding electrode, transmitting the electric arc of the first tungsten electrode to the second tungsten electrode, only one electric arc is burnt, burning one or two electric arcs at the moment of switching the electric arcs, electrifying a third tungsten electrode adjacent to the second tungsten electrode by using a third welding electrode, transmitting the electric arc of the second tungsten electrode to the third tungsten electrode, … …, transmitting the electric arcs to the last tungsten electrode and the last tungsten electrode to continue transmitting according to the sequence, switching the electric arcs among a plurality of tungsten electrodes, only one electric arc is burnt at any moment, so that only a small part of time is spent on burning the electric arc for each tungsten electrode, and the tungsten electrodes are cooled in the rest of time, the current carrying capacity of the tungsten electrode is greatly improved, and the electric arc energy can be greatly improved. In the embodiment, the tungsten electrode can be arranged and formed into a required shape according to the process requirement, so that the energy density of the electric arc is not increased for the base metal, the deposition rate can be improved while the dilution rate is ensured, and the problem of low deposition rate of tungsten electrode argon arc surfacing is solved.
In a preferred embodiment, M tungsten electrodes of the present embodiment are arranged in a line to form a line heat source: including straight lines and curved lines.
In a preferred embodiment, M tungsten electrodes of the present embodiment are arranged to form a surface, thereby forming a surface heat source.
In a preferred embodiment, the M tungsten electrodes of the present embodiment are arranged in a circular shape to form an annular surface heat source.
In the preferred embodiment, since success or failure of arc switching between tungsten electrodes depends largely on the tungsten electrode spacing, the present embodiment makes the spacing between two adjacent tungsten electrodes the same.
In a preferred embodiment, the changeover switch of the present embodiment has on/off of a set frequency and can pass a current of the order of hundreds of amperes.
Each welding power supply and a plurality of tungsten electrodes form a welding loop, a change-over switch is connected in series in each welding loop, the on-off of a frequency control loop can be set to control the switching of electric arcs, and the switching frequency of the change-over switch is required to be ensured in order to ensure the uniform distribution and energy of a heat source.
In a preferred embodiment, the welding power supply has steep characteristics.
Since a higher voltage is required for arc striking, the voltage of the arc drops significantly after arc striking. If the characteristics of the welding power supply are the same as those of the common power supply, the power supply is easy to be short-circuited, the heat source current cannot be adjusted, and the welding power supply is overheated and burns off when being serious. Therefore, the output characteristic of the welding power supply is adjusted by changing the degree of primary interstage coupling, so that the output voltage of the welding power supply drops greatly after secondary arc discharge without increasing primary current according to a transformation ratio, and the voltage drop is realized.
The present embodiment also provides a heat source control method including:
the electric arcs are switched among the M tungsten electrodes by controlling the change-over switch, only one electric arc burns at any time, and a linear heat source or a surface-shaped heat source is obtained.
The present embodiment also provides a welding apparatus including the heat source and the welding torch of the present embodiment;
the M tungsten electrodes of the heat source are simultaneously disposed within a single torch. The welding torch is required to ensure that: the tungsten electrodes connected with the same welding power supply are electrically communicated, and the tungsten electrodes connected with different welding power supplies are electrically insulated.
Since success of arc switching between tungsten electrodes depends largely on the tungsten electrode spacing, the torch is designed to ensure that the spacing between the tungsten electrodes is the same.
Example 1: as shown in fig. 1 and 2, the heat source of the present embodiment includes three welding power sources, three change-over switches, six tungsten electrodes, and argon shield gas; the six tungsten electrodes are arranged in a straight line and are respectively represented by numbers 1-6; three power supplies, designated respectively A, B, C; the No. 1 and No. 4 tungsten electrodes are connected with a welding power supply A, the No. 2 and No. 5 tungsten electrodes are connected with a welding power supply B, and the No. 3 and No. 6 tungsten electrodes are connected with a welding power supply C; in the embodiment, the distance between the tungsten electrodes is 1-6mm, the welding current is 30-500A, the switching frequency of the switch is 1-1000 Hz, and the distance between the tungsten electrodes and the base metal is 2-6 mm;
when the heat source works, the change-over switch enables the welding loop of the power supply A to be electrified, the electric arc firstly burns an arc on the No. 1 tungsten electrode, then the change-over switch enables the welding loop of the power supply B to be electrified, the electric arc is switched from the No. 1 tungsten electrode to the No. 2 tungsten electrode, the change-over switch enables the welding loop of the power supply A to be powered off, then the welding loop of the power supply C is electrified, the electric arc is switched from the No. 2 tungsten electrode to the No. 3 tungsten electrode, the electric arc is sequentially switched to the No. 6 tungsten electrode at a set frequency, and then the. The spot heat source of the tungsten electrode argon arc is expanded into a line heat source by switching the electric arc among a plurality of tungsten electrodes. Because the electric arc is switched among six tungsten electrodes, for each tungsten electrode, only one sixth of the time is used for burning the electric arc, and the tungsten electrode is cooled in the rest time, so that the current carrying capacity of the tungsten electrode is greatly improved, the electric arc energy is greatly improved, the energy density acting on the base metal is not increased, and the dilution rate is not increased.
Example 2: as shown in fig. 3, the heat source of the present embodiment includes three welding power sources, three switches, nine tungsten electrodes, and argon shield gas; nine tungsten electrodes are arranged in a 3 x 3 array and are respectively represented by numbers 1-9; three power supplies, designated respectively A, B, C; the No. 1, No. 4 and No. 7 tungsten electrodes are connected with a welding power supply A, the No. 2, No. 5 and No. 8 tungsten electrodes are connected with a welding power supply B, and the No. 3, No. 6 and No. 9 tungsten electrodes are connected with a welding power supply C; in the embodiment, the distance between the tungsten electrodes is 1-6mm, the welding current is 30-500A, the switching frequency of the switch is 1-1000 Hz, and the distance between the tungsten electrodes and the base metal is 2-6 mm;
when the heat source works, the change-over switch enables the welding loop of the power supply A to be electrified, the electric arc firstly burns the electric arc on the No. 1 tungsten electrode, then the change-over switch enables the welding loop of the power supply B to be electrified, the electric arc is switched from the No. 1 tungsten electrode to the No. 2 tungsten electrode, the change-over switch enables the welding loop of the power supply A to be powered off, then the welding loop of the power supply C is powered on, the electric arc is switched from the No. 2 tungsten electrode to the No. 3 tungsten electrode, the electric arc is sequentially switched to the No. 9 tungsten electrode at a set frequency, then the electric arc is sequentially switched to the No. 1 tungsten electrode, and the point heat source of the tungsten electrode argon. Because the electric arc is switched among nine tungsten electrodes, only one ninth of the time is used for burning the electric arc for each tungsten electrode, and the tungsten electrodes are cooled in the rest time, so that the current carrying capacity of the tungsten electrodes is greatly improved, the electric arc energy is greatly improved, the energy density acting on the parent metal is not increased, and the dilution rate is not increased.
Example 2: as shown in fig. 4, the heat source of the present embodiment includes three welding power sources, three change-over switches, six tungsten electrodes, and argon shield gas; the six tungsten electrodes are circularly arranged and are respectively represented by numbers 1-6; three power supplies, designated respectively A, B, C; the No. 1 and No. 4 tungsten electrodes are connected with a welding power supply A, the No. 2 and No. 5 tungsten electrodes are connected with a welding power supply B, and the No. 3 and No. 6 tungsten electrodes are connected with a welding power supply C; in the embodiment, the distance between the tungsten electrodes is 1-6mm, the welding current is 30-500A, the switching frequency of the switch is 1-1000 Hz, and the distance between the tungsten electrodes and the base metal is 2-6 mm;
when the heat source works, the change-over switch enables the welding loop of the power supply A to be electrified, the electric arc firstly burns an arc on the No. 1 tungsten electrode, then the change-over switch enables the welding loop of the power supply B to be electrified, the electric arc is switched from the No. 1 tungsten electrode to the No. 2 tungsten electrode, the change-over switch enables the welding loop of the power supply A to be powered off, then the welding loop of the power supply C is enabled to be electrified, the electric arc is switched from the No. 2 tungsten electrode to the No. 3 tungsten electrode, the electric arc is sequentially switched to the No. 6 tungsten electrode at a set frequency, and. The spot heat source of the tungsten electrode argon arc is expanded into a circular surface heat source by switching the electric arc among a plurality of tungsten electrodes. Because the electric arc is switched among six tungsten electrodes, for each tungsten electrode, only one sixth of the time is used for burning the electric arc, and the tungsten electrode is cooled in the rest time, so that the current carrying capacity of the tungsten electrode is greatly improved, the electric arc energy is greatly improved, the energy density acting on the base metal is not increased, and the dilution rate is not increased.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (3)
1. A control method of a multi-tungsten electrode argon arc heat source comprises the following steps that the heat source comprises N welding power supplies, N change-over switches, M tungsten electrodes and argon protective gas; n, M are all positive integers greater than or equal to 3;
the cathode of each welding power supply is connected with one or more tungsten electrodes, the end faces of M tungsten electrodes are arranged into a linear shape or a surface shape, the distance between two adjacent tungsten electrodes can ensure the transmission of electric arcs, and three adjacent tungsten electrodes are respectively connected with different welding power supplies; m tungsten electrodes are positioned above the base material;
the positive electrode of each welding power supply is connected with the base material through a change-over switch; argon protective gas is distributed between the tungsten electrode and the base metal;
the control method is characterized by comprising the following steps:
the electric arcs are switched among the M tungsten electrodes by controlling the change-over switch, only one electric arc burns at any time, and a linear heat source or a surface-shaped heat source is obtained.
2. The method for controlling a multiple tungsten argon arc heat source according to claim 1, wherein the switch can be turned on and off at a set frequency and can pass a current of the order of hundreds of amperes.
3. The method for controlling a multiple tungsten argon arc heat source according to claim 2, wherein the welding power source has a steep characteristic.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811615325.5A CN109454315B (en) | 2018-12-27 | 2018-12-27 | Multi-tungsten electrode argon arc heat source, control method and welding device |
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| CN201811615325.5A CN109454315B (en) | 2018-12-27 | 2018-12-27 | Multi-tungsten electrode argon arc heat source, control method and welding device |
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| CN109454315B true CN109454315B (en) | 2020-10-13 |
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| CN111843129B (en) * | 2020-07-10 | 2021-11-05 | 江苏亨通海洋光网系统有限公司 | Multi-gun automatic welding and repair welding device for armored copper pipe in optical cable |
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Patent Citations (9)
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| US4143260A (en) * | 1973-10-26 | 1979-03-06 | Fagersta Aktiebolag | Multi electrode torch |
| CN1600491A (en) * | 2004-10-22 | 2005-03-30 | 哈尔滨工业大学 | Dual tungsten electrodes welding torch in use for argon are welding |
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