CN104308342A - Central pulsation negative-pressure arc welding device and method - Google Patents
Central pulsation negative-pressure arc welding device and method Download PDFInfo
- Publication number
- CN104308342A CN104308342A CN201410458968.9A CN201410458968A CN104308342A CN 104308342 A CN104308342 A CN 104308342A CN 201410458968 A CN201410458968 A CN 201410458968A CN 104308342 A CN104308342 A CN 104308342A
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- arc
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- negative pressure
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Classifications
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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
- B23K9/24—Features related to 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
-
- 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
- B23K9/26—Accessories for electrodes, e.g. ignition tips
Abstract
The invention relates to a central pulsation negative-pressure arc welding device and method, and belongs to the technical field of welding equipment and methods. An inner cavity of a hollow tubular electrode and the center of an arc below the hollow tubular electrode enter a periodic negative-pressure state by virtue of an air extraction device, and when the center of the arc is in a normal-pressure state, the arc is in a free arc form; when the center of the arc is in a negative-pressure state, the arc is in a restrained state under the compression action of external atmospheric pressure; therefore, the arc is switched between a free arc and a restrained arc to implement the central pulsation negative-pressure arc welding method. The pulsation arc produced by the welding device and method has oscillation and stirring functions for a welding pool, so that liquid metal forms tiny isometric crystals, the formation of air holes is suppressed, and the mechanical performance of a welding joint is improved; the pulsation frequency and duty ratio of the arc are regulated to accurately control the oscillation and stirring of the welding pool, the welding penetration and heat input.
Description
Technical field
The present invention relates to is a kind of center pulsed negative pressure arc-welding apparatus and method, belongs to welding equipment and method and technology field.
Background technology
Solder technology is developed so far, and the target of pursuit is high-quality, efficient and high speed.Welding pool, as a process the most complicated in welding process, has important impact for welding quality, welding efficiency and speed of welding.Welding pool form and behavior are also often weld defects, as the key factor that pore, slag inclusion and weld crack etc. produce.And the crystallization process of welding pool affects the quality of weld seam and the mechanical property of welding point especially.Due to very complicated in welding pool crystallization process, be often easy to form thick columnar dendrite, affect the mechanical property of weld seam.Therefore, controlling the crystallization of welding pool metal, is one of important means obtaining good welds joint.For these problems, scholar is had to propose mechanical oscillation welding work pieces being applied to certain frequency and amplitude the earliest, molten bath is made to produce certain forced oscillation, break the columnar dendrite being easy to grow up, the structure changed in molten bath rises and falls and Energy distribution, reduce composition and cross cold-zone, thus control molten pool metal solidifies the tiny equiax crystal of formation.This method, achieves certain effect.In addition, some scholars have carried out the research of ultrasonic-TIG welding procedure, have studied the ultrasonic impact added welding pool.Viewpoint is: on the one hand, in transonic process, part energy is converted into heat energy by liquid absorption, this just causes the decay of ultrasonic amplitude, acoustic pressure gradient is from top to bottom defined in molten bath, the liquid metal causing the temperature in molten bath higher, at a high speed to molten bath flows, adds welding penetration.On the other hand, ultrasonic wave is delivered to after in molten bath, can produce strong stirring, convection current and effect of vibration to welding pool, causes the thick dendrite grown broken, makes it to become the forming core particle forming tiny equiax crystal.
Summary of the invention
The object of the invention is to overcome in existing solder technology the weld defect and deficiency that are easy to produce, provide a kind of center pulsed negative pressure arc-welding apparatus and method.The operation of this device and method is simple and easy, multiple welding surroundings can be adapted to, by the electric arc of periodically pulsing, welding pool is stirred and oscillation action, can not only become to increase welding penetration, and the formation of thick columnar dendrite in welding pool crystallization process can be suppressed, also be conducive to the effusion of gas in molten bath simultaneously, decrease gas pore in weld metal defect, greatly improve the mechanical property of welding point and the quality of weld seam.
For achieving the above object, the present invention adopts following technical scheme.
A kind of center pulsed negative pressure arc-welding apparatus, is characterized in that: it comprises:
Welding gun, is provided with hollow tube cathode in it;
Air extractor, the intracavity inter-connection of itself and described hollow tube cathode, makes the arc center below the inner chamber of hollow tube cathode and hollow tube cathode form negative pressure region.
Described welder also comprises pressure relief device, and wherein, described air extractor is communicated with described hollow tube cathode by described pressure relief device, and the pipeline being communicated with described pressure relief device and described hollow tube cathode is provided with valve.
Also comprise the pressure display unit for measuring and show pressure in described pressure relief device, described pressure display unit is connected with described pressure relief device.
Described welding gun is non-melt pole welding gun.
A kind of center pulsed negative pressure arc-welding method, it is characterized in that: there is the gas piping of air extractor to hollow tube cathode, by air extractor, described pipeline is bled process, hollow tube cathode inner chamber and place of below arc center thereof is made to form periodic negative pressure state, when arc center is in atmospheric pressure state, arc shape is free arc shape; When arc center is in negative pressure state, outside under atmospheric compression, arc shape is made to be contained state; Thus establish center pulsed negative pressure electric arc.
Described welding method, is characterized in that: periodically open and turn off described valve, makes hollow tube cathode inner chamber and place of below arc center thereof form periodic negative pressure state.
In welding process, the ripple frequency of center pulsed negative pressure electric arc can regulate and control.
Compared with prior art, the advantage of the inventive method is as follows:
Welder of the present invention and method produce center pulsed negative pressure electric arc, the stirring to welding pool and vibration can be realized, not only can suppress the formation of thick columnar dendrite, molten pool metal crystallization is made to form the equiax crystal of fine uniform, but also be conducive to the effusion of gas in molten bath, not easily form pore, improve the mechanical property of welding point.In addition, when electric arc is in contained form, the energy density of electric arc and electric arc penetration power, significantly higher than free electric arc, serve the effect increasing welding penetration.
Accompanying drawing explanation
Fig. 1 is this welding method device for carrying out said schematic diagram.
Fig. 2 is the sequential chart that valve is opened and closed.
In figure: 1, the source of welding current and control system thereof, 2, non-melt pole welding gun, 3, hollow tube cathode, 4, welding work pieces, 5, air extractor, 6, gas-guide pipeline A, 7, pressure relief device, 8, pressure display unit, 9, gas-guide pipeline B, 10, valve, 11, gas-guide pipeline C, 12, jointing, 13, welding cable A, 14, welding cable B, 15, free electric arc, 16, constrained arc.
Detailed description of the invention
Embodiments of the present invention are specifically described below with reference to accompanying drawing.Be illustrated in figure 1 this welding method device for carrying out said schematic diagram, this center pulsed negative pressure arc-welding apparatus mainly comprises the source of welding current and control system 1 thereof, non-melt pole welding gun 2, hollow tube cathode 3, welding work pieces 4, air extractor 5, pressure relief device 7, pressure display unit 8, valve 10,---------------gas-guide pipeline C 11---jointing 12---hollow tube cathode 3 forms a road gas piping to valve 10 to gas-guide pipeline B 9 to pressure relief device 7 to gas-guide pipeline A 6 to wherein air extractor 5, pressure display unit 8 is connected with pressure relief device 7, the source of welding current and control system 1 thereof---welding cable B 14---welding work pieces 4---non-melt pole welding gun 2---the welding cable A 13---source of welding current and control system 1 thereof, form a road electric loop, this welding method about the necessary gas circuit of welding gun and water route connection method be all conventional connection.So be no longer described.
Below in conjunction with Fig. 1, the step of this welder and method is described in detail:
First, by welding work pieces 4 and the welding wire that matches ready, non-melt pole welding gun 2 is in position suitable directly over welding work pieces 4, wire feeder is in the side of welding gun, the required gas circuit of welding gun is conventionally connected with water route,---gas-guide pipeline A 6---pressure relief device 7---gas-guide pipeline B 9---valve 10---this road exact connect ion of gas-guide pipeline C11---jointing 12---hollow tube cathode 3 of guaranteeing air extractor 5, under guaranteeing that valve 10 is in closed condition, start air extractor 5, pumped down process is carried out to pressure relief device 7.Observe pressure display unit 8, until the pressure in pressure relief device 7 reaches default negative pressure value.Now, start high-frequency arc strike by the source of welding current and control system 1 thereof, free electric arc 15 can be formed between hollow tube cathode 3 and welding work pieces 4.After free electric arc 15 is stable, control by-pass valve control 10 by the source of welding current and control system 1 thereof periodically open and close, when valve 10 is in closed condition, electric arc is free electric arc 15, when valve 10 is in opening state, electric arc is constrained arc 16, thus electric arc is periodically switched between free electric arc 15 and constrained arc 16, sets up center pulsed negative pressure electric arc.
In welding process, the frequency that can opened by the valve 10 changed as shown in Figure 2 and be closed and dutycycle change the ripple frequency of center pulsed negative pressure electric arc and the time of each arc shape arcing in one-period.Thus realize welding Bath vibration and stirring, welding penetration and the hot accurate control inputted.
Claims (7)
1. a center pulsed negative pressure arc-welding apparatus, is characterized in that: it comprises:
Welding gun, is provided with hollow tube cathode in it;
Air extractor, the intracavity inter-connection of itself and described hollow tube cathode, makes the arc center below the inner chamber of hollow tube cathode and hollow tube cathode form negative pressure region.
2. a kind of center according to claim 1 pulsed negative pressure arc-welding apparatus, it is characterized in that: it also comprises pressure relief device, wherein, described air extractor is communicated with described hollow tube cathode by described pressure relief device, and the pipeline being communicated with described pressure relief device and described hollow tube cathode is provided with valve.
3. a kind of center according to claim 2 pulsed negative pressure arc-welding apparatus, it is characterized in that: it also comprises the pressure display unit for measuring and show pressure in described pressure relief device, and described pressure display unit is connected with described pressure relief device.
4. a kind of center according to claim 1 pulsed negative pressure arc-welding apparatus, is characterized in that: described welding gun is non-melt pole welding gun.
5. a center pulsed negative pressure arc-welding method, it is characterized in that: there is the gas piping of air extractor to hollow tube cathode, by air extractor, described pipeline is bled process, hollow tube cathode inner chamber and place of below arc center thereof is made to form periodic negative pressure state, when arc center is in atmospheric pressure state, arc shape is free arc shape; When arc center is in negative pressure state, outside under atmospheric compression, arc shape is made to be contained state; Thus establish center pulsed negative pressure electric arc.
6. a kind of center according to claim 5 pulsed negative pressure arc-welding method, is characterized in that: periodically open and turn off described valve, makes hollow tube cathode inner chamber and place of below arc center thereof form periodic negative pressure state.
7. a kind of center according to claim 5 pulsed negative pressure arc-welding method, it is characterized in that: in welding process, the ripple frequency of center pulsed negative pressure electric arc can regulate and control.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410458968.9A CN104308342B (en) | 2014-09-10 | 2014-09-10 | Center pulsed negative pressure arc-welding apparatus and method |
| PCT/CN2014/088499 WO2016037393A1 (en) | 2014-09-10 | 2014-10-13 | Central negative-pressure electric arc welding apparatus and method |
| US14/865,491 US20160067811A1 (en) | 2014-09-10 | 2015-09-25 | Central negative pressure arc welding apparatus and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410458968.9A CN104308342B (en) | 2014-09-10 | 2014-09-10 | Center pulsed negative pressure arc-welding apparatus and method |
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| CN104308342A true CN104308342A (en) | 2015-01-28 |
| CN104308342B CN104308342B (en) | 2017-04-05 |
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| CN201410458968.9A Active CN104308342B (en) | 2014-09-10 | 2014-09-10 | Center pulsed negative pressure arc-welding apparatus and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105436672A (en) * | 2016-01-12 | 2016-03-30 | 北京工业大学 | Hollow cathode annular negative-pressure electric arc welding method |
| CN105499765A (en) * | 2016-01-12 | 2016-04-20 | 北京工业大学 | Annular negative-pressure consumable electrode arc welding method |
| CN105537723A (en) * | 2016-01-12 | 2016-05-04 | 北京工业大学 | Method of swinging electric arc welding with double hollow cathodes |
| CN107685193A (en) * | 2017-09-15 | 2018-02-13 | 哈尔滨工业大学（威海） | Pulsed negative pressure laser enhancing type lockhole TIG weld device |
| CN107790886A (en) * | 2017-09-15 | 2018-03-13 | 哈尔滨工业大学（威海） | Pulsed negative pressure formula laser enhancing KTIG and MIG composite welding apparatus and method |
| CN110340498A (en) * | 2019-07-16 | 2019-10-18 | 西南交通大学 | Hollow ring tungsten electrode GTA array silk filling increasing material manufacturing method and device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105436672A (en) * | 2016-01-12 | 2016-03-30 | 北京工业大学 | Hollow cathode annular negative-pressure electric arc welding method |
| CN105499765A (en) * | 2016-01-12 | 2016-04-20 | 北京工业大学 | Annular negative-pressure consumable electrode arc welding method |
| CN105537723A (en) * | 2016-01-12 | 2016-05-04 | 北京工业大学 | Method of swinging electric arc welding with double hollow cathodes |
| CN105537723B (en) * | 2016-01-12 | 2017-11-24 | 北京工业大学 | Double hollow cathode swing arc welding methods |
| CN105436672B (en) * | 2016-01-12 | 2017-12-08 | 北京工业大学 | A kind of hollow cathode ring-type negative pressure arc-welding method |
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| CN107685193A (en) * | 2017-09-15 | 2018-02-13 | 哈尔滨工业大学（威海） | Pulsed negative pressure laser enhancing type lockhole TIG weld device |
| CN107790886A (en) * | 2017-09-15 | 2018-03-13 | 哈尔滨工业大学（威海） | Pulsed negative pressure formula laser enhancing KTIG and MIG composite welding apparatus and method |
| CN107790886B (en) * | 2017-09-15 | 2019-09-17 | 哈尔滨工业大学（威海） | Pulsed negative pressure formula laser enhancing KTIG and MIG composite welding apparatus and method |
| CN110340498A (en) * | 2019-07-16 | 2019-10-18 | 西南交通大学 | Hollow ring tungsten electrode GTA array silk filling increasing material manufacturing method and device |
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| CN104308342B (en) | 2017-04-05 |
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