CN110977216A - Novel pulse ultrasonic electric arc composite welding device and welding method thereof - Google Patents
Novel pulse ultrasonic electric arc composite welding device and welding method thereof Download PDFInfo
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Abstract
A novel pulse ultrasonic electric arc hybrid welding device and a welding method thereof belong to the technical field of electric arc welding and welding metallurgy. The invention solves the problems of unstable output of the existing pulse ultrasonic field, poor heat dissipation of the transducer, incapability of working for a long time, complex equipment operation and high precision requirement. The transducer is connected with the amplitude transformer, and the amplitude transformer setting is in water cooling system, and the transducer passes through transducer walking platform and realizes its displacement along horizontal direction and vertical direction, and the electrode is worn to establish in the centre bore of transducer, and the electrode clamp is fixed on electrode walking platform through on the upper portion of electrode, and realizes its displacement along horizontal direction and vertical direction through electrode walking platform, is connected through the wire between welding source and the electrode, is connected through the wire between ultrasonic power source and the transducer. The pulse ultrasound is obtained by controlling the power of the ultrasonic power supply to output according to a certain frequency, and the pulse peak value and the base value are both adjustable.
Description
Technical Field
The invention relates to a novel pulse ultrasonic electric arc hybrid welding device and a welding method thereof, belonging to the technical field of electric arc welding and welding metallurgy.
Background
The arc welding has the advantages of simple operation, high production efficiency and easy realization of automation, and is widely applied to the manufacturing field and the industrial field, including the industries of automobiles, spaceflight, aviation, shipbuilding, navigation, weaponry, energy, buildings and the like. In the development of arc welding technology, the main goals of obtaining a better quality welding joint and higher welding efficiency are always achieved. The defects of the traditional electric arc welding are mainly low welding efficiency, joint deformation, small fusion depth, thick joint structure and the like.
Based on this, how to realize a high-quality and high-efficiency arc welding technology has become a research focus. When the ultrasound propagates in the medium, a series of effects, such as mechanical effect, thermal effect, chemical effect, biological effect and the like, are generated. Mechanical effects such as stirring, dispersion, impact fragmentation and acoustic suspension; thermal effects such as bulk heating caused by absorption of acoustic energy, localized heating at boundaries, etc.; chemical effects such as promoting oxidation and reduction, promoting metal grain refinement, etc. The arc welding process can be summarized as plasma heating, with the filler/parent material melting to form a molten pool, which solidifies to form the weld seam structure. The mechanical effect of the ultrasound should affect the arc plasma form and the molten pool oscillation, the thermal effect may change the welding energy, the chemical effect may improve the weld joint structure and improve the performance of the welding joint, and therefore, the ultrasound-arc hybrid welding method is born. There are patents, application numbers 200710144659.4 and 200710144660.7, which disclose a welding method in which ultrasonic waves are combined with arc welding processes of a non-consumable electrode and a consumable electrode, respectively, and a patent application number 201510131475.9, which discloses a pulse ultrasonic arc combined welding method for aluminum alloys. According to the report of the literature ' research on action mechanism and welding characteristics of ultrasonic-arc plasma, Shewang, Haerbin university of Industrial science, student's thesis, 2016, sixth chapter ', in the aluminum alloy welding process, when a pulse ultrasonic arc hybrid welding method is adopted, the welding process is more stable, the weld grains are obviously refined, and the mechanical property of a welded joint is obviously improved. However, the method has the advantages of intermittent ultrasonic existence, unadjustable pulse peak value and no ultrasonic effect on basic value, and is formed by a standing wave formula
It can be known that when the fundamental value does not have ultrasonic action, a certain time is needed to reconstruct the standing wave sound field when the peak value acts again, so that the sound field fluctuation in the pulse process is large, the control on electric arcs and molten drops is not facilitated, and meanwhile, the ultrasonic energy transmitted into the molten pool is limited. According to the book "Zhang Wen toma, Zhang Gong Fang, Du Xue Yu, weld metallurgy: basic principle [ M]Mechanical Industrial Press, 1995 "and literature" under the heading of Xiao Liang, Zhongsheng, Zhu Bao, et al]The hot working process 2016,45(7):6-10. it can be known that the arc form with periodic change can stir the molten pool and improve the weld structure, the ultrasound transmitted into the molten pool can promote the grain refinement and the structure evolution, the ultrasonic cavitation is the main reason of the change of the sound to the weld structure, and the threshold condition is generated:
PB＝P0+Pc
in the formula: pBIs the cavitation threshold, P0Is static pressure, PcIn order to be the strength of the liquid,
in the formula: pvIs the bubble internal vapor pressure, σ is the surface tension coefficient, R0The initial radius of the cavitation nuclei.
When the ultrasonic acts on the liquid, the amplitude of the alternating sound pressure is larger than the static pressure in the liquid, the peak value in the negative pressure phase of the sound pressure can not only counteract the static pressure of the liquid, but also locally form a negative pressure acting area in the liquid phase, and if the negative pressure can overcome the binding force among liquid molecules, the area can form a cavity, namely cavitation bubbles are generated; when the positive pressure phase comes, the cavitation bubbles are closed and collapsed, namely, the acoustic cavitation is realized. Therefore, how to obtain a stably-changing pulse ultrasonic field, improve the input of ultrasonic energy in the molten pool and improve the cavitation effect in the molten pool is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to solve the problems that the existing pulse ultrasonic field is unstable in output, a transducer is poor in heat dissipation, cannot work for a long time, is complex in equipment operation and has high precision requirement, and further provides a novel pulse ultrasonic electric arc composite welding device.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a novel pulse supersound electric arc hybrid welding device, it includes the supersound power, the transducer, transducer walking platform, welding power, the electrode clamp, electrode walking platform, become width of cloth pole and water cooling system, wherein the transducer is connected with become width of cloth pole, it sets up in water cooling system to become width of cloth pole, the transducer passes through transducer walking platform and realizes its displacement along horizontal direction and vertical direction, the electrode is worn to establish in the centre bore of transducer, the electrode clamp is passed through on the upper portion of electrode and is fixed on electrode walking platform, and realize its displacement along horizontal direction and vertical direction through electrode walking platform, be connected through the wire between welding power and the electrode, be connected through the wire between supersound power and the transducer.
Furthermore, the displacement adjustment precision of the transducer on the transducer walking platform and the displacement adjustment precision of the electrode on the electrode walking platform are both 0.01 +/-mm.
Furthermore, the water cooling system comprises a shell and a cooling water pipe arranged in the shell, the amplitude transformer is arranged in the shell in a penetrating mode, the cooling water pipe is arranged on the outer wall of the amplitude transformer in a coiling mode, a water inlet of the cooling water pipe penetrates through the upper portion of the shell and is communicated with an external water source, and a water outlet of the cooling water pipe penetrates through the lower portion of the shell and is connected with an external water storage unit.
Furthermore, the cooling water pipe is made of high-temperature-resistant polytetrafluoroethylene.
Furthermore, the electrode clamp is made of insulating materials and is fixedly connected with the electrode walking platform through screws.
A welding method using the welding device comprises the following steps:
the method comprises the following steps that firstly, the surface of a workpiece to be welded is cleaned sufficiently before welding, the workpiece to be welded is fixed, and the horizontal position of an energy transducer is fixed through an energy transducer walking platform, wherein the horizontal position is the welding starting position;
adjusting an electrode walking platform, and enabling an electrode to penetrate out of a central hole of the transducer from top to bottom, wherein the distance between the bottom surface of the transducer and the surface of a workpiece to be welded is 8-15 mm when a consumable electrode is welded, and the distance between the bottom surface of the transducer and the surface of the workpiece is 14-24 mm when the consumable electrode is welded;
adjusting and determining parameters of an ultrasonic power supply and a welding power supply, introducing welding shielding gas, carrying out common welding, then turning on the ultrasonic power supply to carry out ultrasonic auxiliary welding, converting a pulse power electric signal provided by the ultrasonic power supply by a transducer to form ultrasonic vibration, enabling an amplitude transformer to respond to power change of 1Hz-2000Hz, amplifying a vibration signal by the amplitude transformer, and sending out the vibration signal from the lower end face of the amplitude transformer; pulsed ultrasound is radiated into a molten pool through electric arc and protective gas radiation, and the molten pool generates acoustic cavitation effect and acoustic current effect under the action of the ultrasound; and when the welding is finished, the welding power supply is firstly closed, then the ultrasonic power supply is closed, and the welding work is finished.
Furthermore, the electric signal output by the ultrasonic power supply is 20kHz-100kHz, the ultrasonic output power adjusting range is 1W-3000W, the ultrasonic power supply realizes pulse power output, the pulse power frequency range is 0.01Hz-2000Hz, the peak value and base value adjusting range is 1W-3000W, and the duty ratio is 0-100%.
Further, when the low frequency is 0.01Hz to 10Hz, the arc form of the basic value stage is larger than that of the peak value stage, the voltage compression of the arc form of the basic value stage and the peak value stage is obvious, the arc form changes along with the change of the pulse frequency, the arc pulsation characteristic is obvious, when the frequency is larger than 10Hz, the arc form is stably compressed under the action of thermal inertia, the pulse frequency range applicable to non-consumable electrode welding is 0.01Hz to 2000Hz, and the pulse frequency range applicable to consumable electrode welding is 10Hz to 2000 Hz.
Compared with the prior art, the invention has the following effects:
the pulse ultrasonic is obtained by controlling the power of the ultrasonic power supply to be output according to a certain frequency, so that the pulse peak value and the base value can be adjusted, and the pulse peak value and the base value can be matched in any proportion; the transducer walking platform and the electrode walking platform are independent from each other, and the transducer and the electrode can be coaxially matched through the walking platform, the distance in the vertical direction of the transducer walking platform and the electrode walking platform can be randomly adjusted, the transducer walking platform and the electrode walking platform are not interfered with each other, the use precision of equipment is greatly improved, and the matching of sound field parameters and electrode parameters can be accurately obtained;
this application has set up water cooling system, and it has covered whole amplitude transformer for welding set homoenergetic enough effectively cools off, can guarantee that equipment uses for a long time.
Compared with the existing pulse ultrasonic/ultrasonic electric arc hybrid welding method, the ultrasonic effect is more obvious, the device is more convenient to use and better in stability, the device is suitable for welding various metal materials, the electric arc form can be regulated and controlled, molten drop transition is improved, cladding efficiency is improved, weld penetration is increased, weld grains are refined, the distribution of weld components is more uniform, welding pore defects are reduced, and the quality of a welded joint is improved.
The method and the device have the advantages that the characteristics of high peak power of the original pulse ultrasonic are kept, the fundamental value ultrasonic is introduced, the ultrasonic intensity in the molten pool is effectively improved, and more obvious influence is generated on the welding molten pool.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a schematic view showing the structure of a water cooling system (wherein the lower part of a cooling water pipe is a schematic cross-sectional view, and x represents water inlet and x represents water outlet);
FIG. 3 is a schematic diagram of pulsed ultrasound controlled arc morphology;
FIG. 4 is a schematic representation of the effect of pulsed ultrasound on the molten bath.
Detailed Description
The first embodiment is as follows: the embodiment is described by combining fig. 1 to 4, a novel pulse ultrasonic arc hybrid welding device, which comprises an ultrasonic power supply 1, a transducer 2, a transducer walking platform 3, a welding power supply 4, an electrode 5, an electrode clamp 6, an electrode walking platform 7, an amplitude transformer 8 and a water cooling system 9, wherein the transducer 2 is connected with the amplitude transformer 8, the amplitude transformer 8 is arranged in the water cooling system 9, the transducer 2 realizes the displacement of the transducer along the horizontal direction and the vertical direction through the transducer walking platform 3, the electrode 5 is arranged in a central hole of the transducer 2 in a penetrating manner, the upper part of the electrode 5 is fixed on the electrode walking platform 7 through the electrode clamp 6, the displacement of the electrode along the horizontal direction and the vertical direction is realized through the electrode walking platform 7, the welding power supply 4 is connected with the electrode 5 through a lead, and the ultrasonic power supply 1 is connected with the transducer 2 through a lead.
Depending on the welding method chosen, the welding power supply 4 may be divided into a GMAW power supply and a GTAW power supply;
the electrodes 5 can be divided into a consumable electrode 5 and a non-consumable electrode 5, depending on the welding method chosen; when the non-melting electrode is welded, the height of the tungsten electrode can be adjusted with high precision through the electrode walking platform 7, and the adjustment precision is 0.01 +/-mm. When the consumable electrode is welded, the distance between the contact tip and the workbench can be adjusted in high precision through the electrode walking platform 7, and the adjustment precision is 0.01 +/-mm.
The electrode 5 is penetrated out from the central hole of the transducer 2 by adjusting the electrode walking platform 7; the distance between the electrode 5 and the transducer 2 and the surface of the workpiece 10 is controlled by adjusting the electrode walking platform 7 and the transducer walking platform 3.
The transducer 2 and the electrode 5 can be well connected at any position in space under the control of the transducer walking platform 3 and the electrode walking platform 7, and the adjustment of the transducer 2 and the electrode 5 is not interfered with each other. The electrode walking platform 7 controls the electrode 5 to move horizontally/vertically, the displacement precision is 0.01mm, the transducer walking platform 3 controls the transducer 2 to move horizontally/vertically, the displacement precision is 0.01mm, the electrode 5 can penetrate out of a center hole of the transducer 2 by adjusting the horizontal positions of the electrode 5 and the transducer 2, and the electrode 5 is not in contact with the inner wall of the transducer 2.
The connection mode between the transducer 2 and the transducer walking platform 3 and the connection mode between the electrode 5 and the electrode walking platform 7 are not limited, as long as the horizontal or vertical displacement of the transducer 2 and the electrode 5 can be realized, for example, by sliding connection of a guide rail.
The lower part of the water cooling system 9 is provided with a water outlet 92-2, and the upper part is provided with a water inlet 92-1. When the composite welding device works, circulating water flows in from the water inlet end and flows out from the water outlet end, the water flow speed is adjustable, and the adjusting range is 1-10 m/min. Can realize the continuous cooling to become amplitude of cloth pole 8 through water cooling system 9, effectively stop the influence of the heat that electrode 5, transducer 2 produced to ultrasonic power supply 1 to make remaining heat can not influence electrode 5, transducer 2 and normally work, realized this application pulse ultrasonic arc hybrid welding device's continuous operation.
The ultrasonic power supply 1 can realize pulse power output, a pulse power electric signal provided by the ultrasonic power supply 1 is converted by the transducer 2 to form ultrasonic vibration, the amplitude transformer 8 can respond to power change of 1Hz-2000Hz, and a vibration signal is amplified by the amplitude transformer 8 and is emitted from the end face of the amplitude transformer 8. The pulse ultrasound described in this application is a pulse signal output by the ultrasound power supply 1.
The mutual interface inputs the desired working parameter in the control system, the drive circuit of the one-chip computer, through the two-way bridge DC-DC converting circuit, through controlling the drive pulse of two full-bridge converters, produce the square signal with phase shift in the primary and secondary sides of the transformer, can regulate the magnitude and flow direction of the power (matching circuit) through the regulation of the phase shift angle of the square wave, the electrical signal is spread, input to the ultrasonic transducer 2, output different pulse supersound.
The output frequency of the ultrasonic power supply 1 is controlled through a control system, and then the pulse peak value and the base value are adjusted, specifically: by setting a control system, the pulse ultrasonic basic value and the peak value are stably output at a certain power; the pulse ultrasonic output waveform is a square wave, the pulse base value is the same as the adjustable range of the peak value, and the adjustable range is 0W to the maximum power of the ultrasonic power supply 1; the ultrasonic power supply 1 can directly set the required pulse peak value/basic value power and frequency, and the duty ratio is adjustable;
the displacement adjusting precision of the transducer 2 on the transducer walking platform 3 and the displacement adjusting precision of the electrode 5 on the electrode walking platform 7 are both 0.01 +/-mm. The transducer walking platform 3/electrode walking platform 7 are both equipped with an electronic screen, which is capable of displaying displacement distances in real time.
The water cooling system 9 comprises a shell 91 and a cooling water pipe 92 arranged in the shell 91, the amplitude transformer 8 is arranged in the shell 91 in a penetrating mode, the cooling water pipe 92 is arranged on the outer wall of the amplitude transformer 8 in a coiling mode, a water inlet 92-1 of the cooling water pipe 92 penetrates through the upper portion of the shell 91 to be communicated with an external water source, and a water outlet 92-2 of the cooling water pipe 92 penetrates through the lower portion of the shell 91 to be connected with an external water storage unit. By adopting the design, the cooling water pipe 92 is arranged to realize the omnibearing cooling of the amplitude transformer 8. The external water storage unit adopts a structure capable of storing water in the prior art, such as a water tank, and the description is omitted here.
The cooling water pipe 92 is made of high-temperature-resistant polytetrafluoroethylene.
The electrode clamp 6 is made of insulating materials and is fixedly connected with the electrode walking platform 7 through screws. The electrode holder 6 has a certain resistance to high temperatures.
A welding method using the welding device comprises the following steps:
the method comprises the following steps that firstly, the surface of a workpiece to be welded is cleaned sufficiently before welding, the workpiece to be welded is fixed, and the horizontal position of an energy converter 2 is fixed through an energy converter walking platform 3, wherein the horizontal position is the welding starting position;
step two, adjusting an electrode walking platform 7, and enabling an electrode 5 to penetrate out of a central hole of the transducer 2 from top to bottom, wherein when a consumable electrode is welded, the distance between the bottom end surface of the transducer 2 and the surface of a workpiece to be welded is 8-15 mm, and when the consumable electrode is welded, the distance between the bottom end surface of the transducer 2 and the surface of the workpiece is 14-24 mm;
adjusting and determining parameters of the ultrasonic power supply 1 and the welding power supply 4, introducing welding shielding gas, carrying out common welding, then turning on the ultrasonic power supply 1 to carry out ultrasonic auxiliary welding, converting a pulse power electric signal provided by the ultrasonic power supply 1 by the transducer 2 to form ultrasonic vibration, enabling the amplitude transformer 8 to respond to power change of 1Hz-2000Hz, amplifying the vibration signal by the amplitude transformer 8, and sending out the vibration signal from the lower end face of the amplitude transformer 8; pulsed ultrasound is radiated into a molten pool through electric arc and protective gas radiation, and the molten pool generates acoustic cavitation effect and acoustic current effect under the action of the ultrasound; and when the welding is finished, the welding power supply 4 is firstly closed, then the ultrasonic power supply 1 is closed, and the welding work is finished. According to the quality of an actual welding product, the parameters of the ultrasonic power supply 1 are mainly peak power/basic power/pulse frequency, and the parameters of the welding power supply 4 are mainly welding current/welding voltage. The ordinary welding refers to ordinary GMAW welding or GTAW welding. The electric arc is in the pulsation change (shrink-expansion) under the effect of pulsed ultrasound, can stir liquid molten bath, the supersound is introduced into the molten bath and can take place cavitation effect and acoustic current effect simultaneously, wherein acoustic cavitation effect and acoustic current effect can improve the melt solidification structure, simultaneously, this application still has the effect of pulsed arc stirring molten bath, electric arc stirring, the effect that the ultrasonic-assisted dual regulation and control molten bath solidifies has been realized, compared with the prior art, its effect of improving the weld seam tissue is better, in consumable electrode welding, electric arc form compression can improve the electric arc energy, it can promote the molten drop transition to improve electric arc, simultaneously, supersound also can promote the molten drop transition (electric arc form compression electric arc energy promotes), transition frequency increases, the introduction of final pulsed ultrasound can show the increase welding cladding efficiency, improve the welded joint quality. The ultrasonic exists all the time in the welding process, so that the ultrasonic regulation and control effect is better. In the welding process, the transducer walking platform 3 and the electrode walking platform 7 are fixed after parameters are respectively adjusted, base materials are placed on the welding platform, and the welding platform moves to form a welding line.
The electric signal output by the ultrasonic power supply 1 is 20kHz-100kHz, the ultrasonic output power adjusting range is 1W-3000W, the ultrasonic power supply 1 realizes pulse power output, the pulse power frequency range is 0.01Hz-2000Hz, the peak value and base value adjusting ranges are 1W-3000W, and the duty ratio is 0-100%.
When the low frequency is 0.01Hz to 10Hz, the arc form of the basic value stage is larger than that of the peak value stage, the voltage compression of the arc forms of the basic value stage and the peak value stage is obvious, the arc form changes along with the change of the pulse frequency, the arc pulsation characteristic is obvious, when the frequency is larger than 10Hz, the arc form is stably compressed under the action of thermal inertia, the pulse frequency range applicable to non-consumable electrode welding is 0.01Hz to 2000Hz, and the pulse frequency range applicable to consumable electrode welding is 10Hz to 2000 Hz. In connection with fig. 3, the output pulse has an effect on the arc. Compared with the ordinary GTAW/GMAW arc, the arc shape shrinks by at least 10%. The base value arc and peak value arc forms alternate along with the frequency, and the high frequency time base value and the peak value arc forms have no difference, namely the arc forms are stably compressed.
Claims (8)
1. The utility model provides a novel pulse supersound electric arc hybrid welding device which characterized in that: it comprises an ultrasonic power supply (1), a transducer (2), a transducer walking platform (3), a welding power supply (4), an electrode (5), an electrode clamp (6), an electrode walking platform (7), an amplitude transformer (8) and a water cooling system (9), wherein the transducer (2) is connected with an amplitude transformer (8), the amplitude transformer (8) is arranged in a water cooling system (9), the transducer (2) realizes the displacement along the horizontal direction and the vertical direction through the transducer walking platform (3), the electrode (5) is arranged in a central hole of the transducer (2) in a penetrating way, the upper part of the electrode (5) is fixed on the electrode walking platform (7) through an electrode clamp (6), and the displacement along the horizontal direction and the vertical direction is realized through the electrode walking platform (7), the welding power supply (4) is connected with the electrode (5) through a lead, and the ultrasonic power supply (1) is connected with the transducer (2) through a lead.
2. The novel pulsed ultrasonic electric arc hybrid welding device according to claim 1, characterized in that: the displacement adjustment precision of the transducer (2) on the transducer walking platform (3) and the displacement adjustment precision of the electrode (5) on the electrode walking platform (7) are both 0.01 +/-mm.
3. The novel pulsed ultrasonic electric arc hybrid welding device according to claim 1 or 2, characterized in that: the water cooling system (9) comprises a shell (91) and a cooling water pipe (92) arranged in the shell (91), the amplitude transformer (8) penetrates through the shell (91), the cooling water pipe (92) is coiled on the outer wall of the amplitude transformer (8), a water inlet (92-1) of the cooling water pipe (92) penetrates through the upper portion of the shell (91) to be communicated with an external water source, and a water outlet (92-2) of the cooling water pipe (92) penetrates through the lower portion of the shell (91) to be connected with an external water storage unit.
4. The novel pulsed ultrasonic electric arc hybrid welding device according to claim 3, characterized in that: the cooling water pipe (92) is made of high-temperature-resistant polytetrafluoroethylene.
5. The novel pulsed ultrasonic electric arc hybrid welding device according to claim 1, 2 or 4, characterized in that: the electrode clamp (6) is made of insulating materials and is fixedly connected with the electrode walking platform (7) through screws.
6. A welding method using the welding apparatus according to any one of claims 1 to 5, characterized in that: it comprises the following steps:
the method comprises the following steps that firstly, the surface of a workpiece to be welded is cleaned sufficiently before welding, the workpiece to be welded is fixed, and the horizontal position of an energy transducer (2) is fixed through an energy transducer walking platform (3), wherein the horizontal position is the welding starting position;
adjusting an electrode walking platform (7), and enabling an electrode (5) to penetrate out of a central hole of the transducer (2) from top to bottom, wherein when the consumable electrode is welded, the distance between the bottom end surface of the transducer (2) and the surface of a workpiece to be welded is 8-15 mm, and when the consumable electrode is welded, the distance between the bottom end surface of the transducer (2) and the surface of the workpiece is 14-24 mm;
adjusting and determining parameters of an ultrasonic power supply (1) and a welding power supply (4), introducing welding shielding gas, carrying out common welding, then turning on the ultrasonic power supply (1) to carry out ultrasonic auxiliary welding, converting a pulse power electric signal provided by the ultrasonic power supply (1) by an energy converter (2) to form ultrasonic vibration, enabling an amplitude transformer (8) to respond to power change of 1Hz-2000Hz, amplifying a vibration signal by the amplitude transformer (8), and sending out the vibration signal from the lower end face of the amplitude transformer (8); pulsed ultrasound is radiated into a molten pool through electric arc and protective gas radiation, and the molten pool generates acoustic cavitation effect and acoustic current effect under the action of the ultrasound; and when the welding is finished, the welding power supply (4) is turned off, then the ultrasonic power supply (1) is turned off, and the welding work is finished.
7. The welding method according to claim 6, characterized in that: the electric signal output by the ultrasonic power supply (1) is 20kHz-100kHz, the ultrasonic output power adjusting range is 1W-3000W, the ultrasonic power supply (1) realizes pulse power output, the pulse power frequency range is 0.01Hz-2000Hz, the peak value and base value adjusting range is 1W-3000W, and the duty ratio is 0-100%.
8. The welding method according to claim 6 or 7, characterized in that: when the low frequency is 0.01Hz to 10Hz, the arc form of the basic value stage is larger than that of the peak value stage, the voltage compression of the arc forms of the basic value stage and the peak value stage is obvious, the arc form changes along with the change of the pulse frequency, the arc pulsation characteristic is obvious, when the frequency is larger than 10Hz, the arc form is stably compressed under the action of thermal inertia, the pulse frequency range applicable to non-consumable electrode welding is 0.01Hz to 2000Hz, and the pulse frequency range applicable to consumable electrode welding is 10Hz to 2000 Hz.
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| CN113579531A (en) * | 2021-08-13 | 2021-11-02 | 哈尔滨工业大学 | Method for ultrasonic pulse MAG composite welding of ultrahigh-strength steel |
| WO2023004866A1 (en) * | 2021-07-28 | 2023-02-02 | 广东铭利达科技有限公司 | Ultrasonic arc-assisting welding apparatus |
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