CN104475923B - CO2 short circuiting welding synchronous pulse magnetic control device and method - Google Patents

CO2 short circuiting welding synchronous pulse magnetic control device and method Download PDF

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CN104475923B
CN104475923B CN201410739393.8A CN201410739393A CN104475923B CN 104475923 B CN104475923 B CN 104475923B CN 201410739393 A CN201410739393 A CN 201410739393A CN 104475923 B CN104475923 B CN 104475923B
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welding
synchronous
field
frequency
waveform
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CN104475923A (en
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常云龙
路林
梅强
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Shenyang University of Technology
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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
    • B23K9/08—Arrangements or circuits for magnetic control of 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

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  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)

Abstract

The invention provides a CO2 short circuiting welding synchronous pulse magnetic control device and method, belongs to the technical field of welding electromagnetic control and particularly relates to a welding method controlling the short circuiting arc droplet transfer mode through external longitudinal synchronous magnetic field. The method is characterized in that a synchronous magnetic control theory is provided, in other words, the process of CO2 short circuiting welding droplet transfer includes an arcing droplet formation period, a droplet short circuiting and liquid bridge formation period and a necking and energy reduction period, magnetic pluses of different varieties are applied into different periods, the requirements on different current and electromagnetic force can be met in different periods of short circuiting transfer accordingly, especially under the small and medium current, on the basis of waveform control, the smooth and fast droplet transfer can be promoted through synchronous magnetic control, and the purposes of spattering reduction and formation optimization can be achieved.

Description

A kind of short circuiting transfer CO 2 The device and method that weldering lock-out pulse magnetic field controls
Technical field
The invention belongs to a kind of welding Electromagnetic Control technical field, control short circuiting arc transfer manner of droplet and the welding method of transient process particularly to a kind of additional longitudinal synchronous field.
Background technology
CO2Gas shielded arc welding from the 1950's come out since, with its low cost, energy-efficient, simple to operate, facilitate implementation automatization and receive much attention.But CO2Welding owing to mode of metal transfer is many based on short circuiting transfer, during welding, existence is splashed greatly, appearance of weld differs from two big shortcomings.This not only causes welding wire and melts the waste problem that but deposition rate is relatively low in a large number, and substantial amounts of splashing result also in heavy follow-up scarfing cinder work, brings great inconvenience for actual production.And this two big shortcoming also limit short circuiting transfer CO2It is welded in the further application in terms of larger current cut deal.In order to solve to splash and shape the problem of difference, people are explored from many aspects.From the perspective of welding material and protection gas, although by using the flux-cored wire containing rare earth (REM) active element such as trace element or K, Na, Ba or application CO2With Ar or CO2With Ar, He and O2Hybrid protection gas (T.I.M.E. weldering) although improving arc shape, achieve reduce splash effect, but lose CO2The economic traits that solid welding has, welding cost is greatly increased.And in terms of welding equipment, the wave control technology such as Surface Tension Transition (STT), control liquid bridge transition (CBT) or cold metal transfer (CMT) are used to achieve good effect, be suitable to filament plate sheet welding, but the most do not solve fundamental contradiction, i.e. liquid bridge shrinks transition and needs bigger electric current, and reduce to splash and wish less liquid bridge electric current, especially when medium current, arc voltage are higher, molten drop presents non axial repulsion transition, and the problem increased of splashing could not solve always at all.In order to preferably realize CO2Weldering molten drop steadily smoothly transits, and Chinese scholars has carried out numerous studies, and wherein externally-applied magnetic field is exactly a kind of effective ways.Externally-applied magnetic field is possible not only to control arc shape and motor process, form, size and the transition frequency to molten drop, the flowing of liquid metal and crystallization process, internal grain tissue size form have extremely important impact.Magnetic control solder technology generally uses the method for regulation magnetic field technological parameter to realize externally-applied magnetic field to CO at present2Effective control of welding process.Abroad, document is had to report outside Longitudinal Magnetic-field Has size and polarity to CO2Weldering affects behavior with MIG weldering spatter loss coefficient, wherein when the size of outside Longitudinal Magnetic-field Has is 300Gauss and polarity of the magnetic field is S under upper N, and CO2The splashing of weldering is reduced to relatively low, and when magnetic field size is 500Gauss and polarity is N under upper S, then the splashing of MIG weldering is relatively low, it is seen that the size in magnetic field and polarity are for reducing CO2There is certain rule in the behavior that affects that weldering is splashed.At home, scholar is had to control CO by longitudinal magnetic field2Gas shielded arc welding splashes, and has carried out the CO under outside Longitudinal Magnetic-field Has controls under different welding conditions2Welding experiment, research shows, under certain welding conditions, outside Longitudinal Magnetic-field Has can efficiently control CO2, there is an optimal magnetic field range in the spatter in welding circuit-shorting transition, it is thus achieved that preferably technological effect, in the range of this, the magnetic field control effect to splashing is preferable simultaneously.But above-mentioned externally-applied magnetic field is based on constant and unordered incorporation way mostly, do not consider, in problems such as the magnetic fields of short circuiting transfer different phase applying varying strength or frequency, to cannot guarantee that magnetic field and each droplet transfer course synchronization.It addition, must have the external magnetic field parameter range of accommodation of broadness for magnetic control means, and it can be fine-tuned, existing apparatus can not fully meet above-mentioned requirements.Based on above-mentioned cognition, the present invention is directed to above-mentioned problem demanding prompt solution and launch research, propose the thought that a kind of additional synchronous field controls, it is achieved Electromagnetic Control accurately controls from coarse being adjusted to of parameter, controls in order from being randomly incorporated into of magnetic field.
Summary of the invention
It is an object of the invention to provide one can be at short circuiting transfer CO2Form section, molten drop short circuit and liquid bridge include arcing molten drop during the weldering droplet transfer and form the different phase including section, necking down and energy reduction section by applying different types of magnetic field impulse, to meet the short circuiting transfer different phase needs to different electromagnetic forces, especially under small area analysis and medium current, can control to promote by applying synchronous field the smooth fast transition of molten drop, it is achieved reduce the device and method that the synchronous field of the shaped objects that splashes, improves controls.
The present invention is achieved by the following technical solutions:
A kind of for short circuiting transfer CO2The method that weldering synchronous field controls, it is characterised in that: the method is to carry out in accordance with the following steps:
(1) by CO2The welding current waveform taked of plan that inversion welding source output obtains through secondary development and arc voltage waveform；
(2) detected by CO by Hall element2The current impulse of inversion welding source output, extract preset welding current waveform and arc voltage waveform, obtain short circuit transition and include that arcing molten drop forms section, molten drop short circuit and liquid bridge and forms section, necking down and the energy reduction section characteristic information in interior different phase, as the foundation of synchronous field generating means preset synchronization exciting curent waveform；
(3) produced the supply of synchronous excitation electric current by the synchronous field generating means using double inverse method and Single-chip Controlling method to make and be arranged on CO2Magnet exciting coil on welding gun produces synchronous field and realizes short circuiting transfer CO2During the weldering droplet transfer, the synchronous field of the different phase including arcing molten drop formation section, molten drop short circuit and liquid bridge formation section, necking down and energy reduction section controls.
Preset welding current waveform and arc voltage waveform in (1) step are consistent with the welding current waveform that common waveform controls and arc voltage waveform, but preset welding current waveform and the frequency of arc voltage waveform, i.e. molten drop transition frequency increase under suitable externally-applied magnetic field effect.
(2) the synchronous excitation electric current exported by synchronous field generating means in step has direct current, square wave alternating-current and pulse output waveform form, can produce D.C. magnetic field, low frequency and high-frequency impulse magnetic field；Magnet exciting coil is made up of coil, magnetic core, heat insulation and cooling-part；Synchronous field includes D.C. magnetic field, low frequency and high-frequency impulse magnetic field, wherein low frequency pulsed magnetic fields frequency range is: 1 ~ 100Hz, and it can make electric arc expand, and makes arc shape present sector or bell shape, high-frequency impulse field frequency scope is: 0.35 ~ 20KHz, and it has magnetic compression electric arc effect；Marginal portion, lock-out pulse magnetic field strength range is: 10 ~ 28mT, intermediate intensity scope is: 5 ~ 12mT；Lock-out pulse exciting curent scope is 1 ~ 300A.
A kind of as above for short circuiting transfer CO2The device that weldering synchronous field controls, it is characterised in that: this device is mainly by CO2Inversion welding source, Hall element, synchronous field generating means, CO2Welding gun, magnet exciting coil and welding cable composition； CO2The both positive and negative polarity of inversion welding source is respectively connected to CO2Welding gun and workpiece, Hall element is enclosed within CO2On welding cable between inversion welding source and workpiece, the signal output part of Hall element is connected with the signal input part of synchronous field generating means, the current output terminal of synchronous field generating means be arranged on CO2Magnet exciting coil on welding gun is connected.
CO2Inversion welding source can export with common waveform controls welding current waveform and arc voltage waveform is consistent but preset welding current waveform that frequency is higher and arc voltage waveform.
The unidirectional current function that synchronous field generating means has exciting curent size, field frequency and a magnet exciting coil temperature display function and offer continuously adjusts, it can produce the supply of synchronous excitation electric current and be arranged on CO2Magnet exciting coil on welding gun produces synchronous field and realizes short circuiting transfer CO2During the weldering droplet transfer, the synchronous field of the different phase including arcing molten drop formation section, molten drop short circuit and liquid bridge formation section, necking down and energy reduction section controls.
The magnet exciting coil being made up of coil, magnetic core, heat insulation and cooling-part, the synchronous field produced by exciting curent, including D.C. magnetic field, low frequency and high-frequency impulse magnetic field, wherein low frequency pulsed magnetic fields frequency range is: 1 ~ 100Hz, and high-frequency impulse field frequency scope is: 0.35 ~ 20KHz.
Advantages of the present invention:The present invention is directed to short circuiting transfer CO2Weldering droplet transfer process forms section, molten drop short circuit and liquid bridge include arcing molten drop and forms the characteristic information in each stage including section, necking down and energy reduction section, it is embodied as following synchronous field to control: during arcing and molten drop are formed, apply a low frequency magnetic pulses, electric arc is expanded, move on arc root speckle, reduce the arc spot pressure inhibition to molten drop, and then molten drop non axial repulsion transition probability when reducing big electric current；In liquid bridge formation section in the case of welding current reduces, by applying a bigger high frequency magnetic field impulse, liquid bridge is promoted to be formed and quickly form necking down；In necking segment, liquid bridge quick-fried disconnected before, welding current declines rapidly the undue gathering preventing energy on liquid bridge.During small area analysis welding, owing to droplet volume is little, liquid bridge can be broken at this moment by Surface Tension Transition, but during big electric current welding, molten drop is the biggest, fully relying on Surface Tension Transition and be not enough to break liquid bridge, now apply a high-strength magnetic pulse, its electromagnetic force produced promotes molten drop steadily to come off together with surface tension.Use synchronous field to control to make molten drop transition frequency increase under suitable externally-applied magnetic field effect, and be expected to solve liquid bridge and shrink transition and need larger current, and reduce spattering problem when needing the root problem of smaller current and big electric current that splashes.
Accompanying drawing explanation
Fig. 1 is the short circuiting transfer CO under synchronous field controls2Welding system schematic diagram.
Figure marks: 1 CO2Inversion welding source, 2 Hall elements, 3 synchronous field generating meanss, 4 CO2Welding gun, 5 magnet exciting coils, 6 workpiece, 7 welding cables and 8 welding wires.
Detailed description of the invention
Embodiment one
Short circuiting transfer CO under synchronous field control2Welding system composition specifically includes: CO2Inversion welding source 1, Hall element 2, synchronous field generating means 3, CO2Welding gun 4, magnet exciting coil 5, workpiece 6, welding cable 7 and welding wire 8.One of which is used for short circuiting transfer CO2The device that weldering synchronous field controls includes: CO2Inversion welding source 1, synchronous field generating means 3 and magnet exciting coil 5 form.It is characterized in that: CO2Inversion welding source 1 can export with common waveform controls welding current waveform and arc voltage waveform is consistent but preset welding current waveform that frequency is higher and arc voltage waveform；The unidirectional current function that synchronous field generating means 3 has exciting curent size, field frequency and a magnet exciting coil temperature display function and offer continuously adjusts, it can produce the supply of synchronous excitation electric current and be arranged on CO2Magnet exciting coil 5 on welding gun 4 produces synchronous field and realizes short circuiting transfer CO2During the weldering droplet transfer, the synchronous field of the different phase including arcing molten drop formation section, molten drop short circuit and liquid bridge formation section, necking down and energy reduction section controls, its input voltage is 220V alternating current, output synchronous excitation current range is 1 ~ 300A, 5 magnet exciting coils that its load is made up of coil, magnetic core, heat insulation and cooling-part, the synchronous field produced by exciting curent includes D.C. magnetic field, low frequency and high-frequency impulse magnetic field, wherein low frequency pulsed magnetic fields frequency range is: 1 ~ 100Hz, and high-frequency impulse field frequency scope is: 0.35 ~ 20KHz.CO2Gas shielded arc welding uses negative polarity power supply connection.I.e. CO2The positive pole of inversion welding source 1 meets CO2Welding gun 4, negative pole connects workpiece 6.
The method is to carry out in accordance with the following steps:
(1) by CO2The current impulse that the plan of inversion welding source 1 output is taked, it specifically includes: start i.e. arcing section CO in each cycle of short circuiting transfer2Inversion welding source 1 applies a bigger narrow welding current pulse to welding wire, in order to striking also promotes wire melting；Form section at molten drop and apply a wider constant current pulse, in order to each cycle can form the molten drop of certain volume (i.e. certain droplet size)；Form section in molten drop short circuit and liquid bridge and reduce welding current, and raise welding current at liquid bridge contraction section subsequently；Liquid bridge quick-fried disconnected before reduce rapidly electric current, and apply a high and wide constant current pulse in electric arc resume combustion section subsequently, it is therefore intended that make electric arc stable state resume combustion.
(2) detected by CO by Hall element 22The current impulse that the plan of inversion welding source 1 output is taked, extract preset welding current waveform and arc voltage waveform, obtain short circuit transition and include that arcing molten drop forms section, molten drop short circuit and liquid bridge and forms section, necking down and the energy reduction section characteristic information in interior different phase, as the foundation of synchronous field generating means 3 preset synchronization exciting curent waveform；
(3) produced the supply of synchronous excitation electric current by synchronous field generating means 3 and be arranged on CO2Magnet exciting coil 5 on welding gun 4 produces synchronous field and realizes short circuiting transfer CO2During the weldering droplet transfer, the synchronous field of different phase controls.It specifically includes: apply a wider low frequency magnetic pulses in arcing section, makes electric arc expand in fan-shaped or bell shape, and lasts till that molten drop forms section；Form section at molten drop, apply a direct current or low frequency magnetic pulses will promote electric arc arc root to extend, anode spot moves, reduce electric arc to molten drop pressure；Then formed when section welding current declines in molten drop short circuit and liquid bridge and add rapidly a narrow and big magnetic field impulse, on the one hand liquid bridge is promoted to shrink, on the other hand the heat of input is increased, in case now affecting molding because heat input reduces, causing molten pool metal spreadability poor, reinforcement is excessive, insufficient width, affecting cut deal welding, the purpose at this moment adding magnetic field impulse is to promote liquid bridge to be formed；Necking segment is liquid bridge necking down explosion early stage, welding current quickly reduces, and energy reduces, and now applies the high frequency magnetic field impulse that an intensity is bigger, the electromagnetic force of this high-strength magnetic pulses generation promotes the droplet transfer together with surface tension, and high-strength magnetic pulse persistance to energy reduces section.
(4) after molten drop comes off, entering restarting section, repeating said process, until completing welding job.
By CO in (1) step and (3) step2The welding current waveform of inversion welding source 1 output and arc voltage waveform and the synchronous excitation current waveform exported by synchronous field generating means 3 are for short circuiting transfer CO2Different phase synchronism output including arcing molten drop formation section, molten drop short circuit and liquid bridge formation section, necking down and energy reduction section during the weldering droplet transfer.
In (1) step by CO2Preset welding current impulse waveform and the arc voltage impulse waveform of inversion welding source 1 output are consistent with the welding current waveform that common waveform controls and arc voltage waveform, but the frequency of preset welding current waveform and arc voltage waveform i.e. molten drop transition frequency increases under lock-out pulse the action of a magnetic field.
In (3) step, the low frequency magnetic field frequency range in synchronous field is: 1 ~ 100Hz, and high frequency magnetic field frequency range is: 0.35 ~ 20KHz.Synchronous field marginal portion strength range is: 10 ~ 28mT, and intermediate intensity scope is: 5 ~ 12mT.Welding current scope is: 130 ~ 220A.The inventive method to be embodied as step as follows:
Step one: according to the welding material of workpiece, thickness of slab (or wall thickness) and speed of welding requirement, select CO2 welding condition, such as welding current, arc voltage, protection gas (CO2) flow, welding wire model and extension elongation, groove type and angle etc..
Step 2: by CO2The both positive and negative polarity of inversion welding source 1 is respectively connected to CO2Welding gun 4 and workpiece 6；Hall element 2 is enclosed within CO2On welding cable 7 between inversion welding source 1 and workpiece 6；The signal output part of Hall element 2 is connected with the signal input part of synchronous field generating means 3；By the current output terminal of synchronous field generating means 3 be arranged on CO2Magnet exciting coil 5 on welding gun 4 is connected.
Step 3: open CO2Inversion welding source 1, Hall element 2 and synchronous field generating means 3 carry out CO2Welding operation.
Step 4: detected by CO by Hall element 22The current impulse that the plan of inversion welding source 1 output is taked, extract preset welding current waveform and arc voltage waveform, obtain short circuit transition and include that arcing molten drop forms section, molten drop short circuit and liquid bridge and forms section, necking down and the energy reduction section characteristic information in interior different phase, as the foundation of synchronous field generating means 3 preset synchronization exciting curent waveform.
Step 5: form section, by CO in arcing section and molten drop2Inversion welding source 1 applies a bigger narrow welding current pulse and a wider constant current pulse respectively to welding wire, so that striking also promotes wire melting to form the molten drop of certain volume (i.e. certain droplet size), and synchronous field generating means 3 will apply low frequency exciting curent one i.e. low-frequency pulse electromagnetic force of low frequency magnetic field of generation to magnet exciting coil 5 during arcing and molten drop are formed, electric arc is expanded, move on arc root speckle, reduce the arc spot pressure inhibition to molten drop, and then molten drop non axial repulsion transition probability when reducing big electric current；Section, CO is formed at liquid bridge2Inversion welding source 1 will reduce welding current, meanwhile, synchronous field generating means 3 produces a bigger high frequency magnetic field the biggest high-frequency impulse electromagnetic force by magnet exciting coil 5 applies a bigger high-frequency excitation electric current, promotes liquid bridge formed and quickly form necking down；In necking segment CO2By applying a pulse welding electric current with certain slope, inversion welding source 1 promotes that liquid bridge shrinks, meanwhile, synchronous field generating means 3 will reduce exciting curent to prevent the superfluous gathering of energy；And liquid bridge quick-fried disconnected before, CO2Inversion welding source 1 by reduce rapidly welding current with prevent energy on liquid bridge undue assemble while produced an i.e. high amplitude pulses electromagnetic force in high-strength magnetic field by synchronous field generating means 3 by magnet exciting coil 5 being applied a high-strength exciting curent, it will promote molten drop steadily to come off together with surface tension.Complete CO with this2Weldering one cycle multiple-pulse synchronous field of short circuiting transfer process controls.
Step 6: repeat above-mentioned welding process, until all having worked.
The range of accommodation of the speed of welding in step one is: 3.5 ~ 5.5m/min
Low frequency magnetic field frequency range in synchronous field in step 5 is: 1 ~ 100Hz, and high frequency magnetic field frequency range is: 0.35 ~ 20KHz.Synchronous field marginal portion strength range is: 10 ~ 28mT, and intermediate intensity scope is: 5 ~ 12mT.Synchronous excitation current range is 1 ~ 300A.The size and Orientation of electromagnetic force is determined by the size and Orientation of exciting curent.

Claims (6)

1. one kind is used for short circuiting transfer CO2The method that weldering synchronous field controls, it is characterised in that: the method is to carry out in accordance with the following steps:
Step one: by CO2The welding current waveform taked of plan that inversion welding source (1) output obtains through secondary development and arc voltage waveform；
Step 2: detected by CO by Hall element (2)2The current impulse that inversion welding source (1) exports, extract preset welding current waveform and arc voltage waveform, obtain short circuit transition and include that arcing molten drop forms section, molten drop short circuit and liquid bridge and forms section, necking down and the energy reduction section characteristic information in interior different phase, as the foundation of synchronous field generating means (3) preset synchronization exciting curent waveform；
Step 3: produced the supply of synchronous excitation electric current by the synchronous field generating means (3) using double inverse method and Single-chip Controlling method to make and be arranged on CO2Magnet exciting coil (5) on welding gun (4) produces synchronous field and realizes short circuiting transfer CO2During the weldering droplet transfer, the synchronous field of the different phase including arcing molten drop formation section, molten drop short circuit and liquid bridge formation section, necking down and energy reduction section controls；
The synchronous excitation electric current exported by synchronous field generating means (3) in step 2 has direct current, square wave alternating-current and pulse output waveform form, can produce D.C. magnetic field, low frequency and high-frequency impulse magnetic field；Magnet exciting coil (5) is made up of coil, magnetic core, heat insulation and cooling-part；Synchronous field includes D.C. magnetic field, low frequency and high-frequency impulse magnetic field, wherein low frequency pulsed magnetic fields frequency range is: 1 ~ 100Hz, and it can make electric arc expand, and makes arc shape present sector or bell shape, high-frequency impulse field frequency scope is: 0.35 ~ 20kHz, and it has magnetic compression electric arc effect；Marginal portion, lock-out pulse magnetic field strength range is: 10 ~ 28mT, intermediate intensity scope is: 5 ~ 12mT；Lock-out pulse exciting curent scope is 1 ~ 300A.
One the most according to claim 1 is used for short circuiting transfer CO2The method that weldering synchronous field controls, it is characterized in that: preset welding current waveform and arc voltage waveform in (1) step are consistent with the welding current waveform that common waveform controls and arc voltage waveform, but preset welding current waveform and the frequency of arc voltage waveform, i.e. molten drop transition frequency can change under additional the action of a magnetic field.
3. one kind is used for short circuiting transfer CO as claimed in claim 12The device that the method that weldering synchronous field controls is used, it is characterised in that: this device is by CO2Inversion welding source (1), Hall element (2), synchronous field generating means (3), CO2Welding gun (4), magnet exciting coil (5) and welding cable (7) composition； CO2The both positive and negative polarity of inversion welding source (1) is respectively connected to CO2Welding gun (4) and workpiece (6), Hall element (2) is enclosed within CO2On welding cable (7) between inversion welding source (1) and workpiece (6), the signal output part of Hall element (2) is connected with the signal input part of synchronous field generating means (3), the current output terminal of synchronous field generating means (3) be arranged on CO2Magnet exciting coil (5) on welding gun (4) is connected.
Device the most according to claim 3, it is characterised in that: CO2Inversion welding source (1) can export but the preset welding current waveform of changeable frequency and arc voltage waveform consistent with the welding current waveform that common waveform controls and arc voltage waveform.
Device the most according to claim 3, it is characterised in that: synchronous field generating means (3) has exciting curent, field frequency continuously adjusts and magnet exciting coil temperature display function, and it can produce the supply of synchronous excitation electric current and be arranged on CO2Magnet exciting coil (5) on welding gun (4) produces synchronous field and realizes short circuiting transfer CO2During the weldering droplet transfer, the synchronous field of the different phase including arcing molten drop formation section, molten drop short circuit and liquid bridge formation section, necking down and energy reduction section controls.
Device the most according to claim 3, it is characterized in that: the magnet exciting coil (5) being made up of coil, magnetic core, heat insulation and cooling-part, the synchronous field produced by exciting curent, including D.C. magnetic field, low frequency and high-frequency impulse magnetic field, wherein low frequency pulsed magnetic fields frequency range is: 1 ~ 100Hz, and high-frequency impulse field frequency scope is: 0.35 ~ 20kHz.
CN201410739393.8A 2014-12-08 2014-12-08 CO2 short circuiting welding synchronous pulse magnetic control device and method Active CN104475923B (en)

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CN104816079B (en) * 2015-04-22 2017-04-19 上海工程技术大学 Rotary magnetic field generating device for welding and working method thereof
CN105328317A (en) * 2015-11-24 2016-02-17 南昌航空大学 System capable of controlling CO2 welding spatter ratio through applied magnetic field device
EP3508297B1 (en) * 2016-09-05 2021-03-10 Panasonic Intellectual Property Management Co., Ltd. Arc welding control method
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EP3702083A1 (en) * 2019-02-27 2020-09-02 FRONIUS INTERNATIONAL GmbH Device and method for welding a workpiece
CN111299758B (en) * 2019-12-16 2021-10-26 沈阳工业大学 Molten drop form control device and method for carbon dioxide gas shielded welding
CN114939710A (en) * 2022-06-15 2022-08-26 辽宁新远特种焊接技术有限公司 Method for promoting falling of short-circuit transition molten drops in carbon dioxide gas shielded welding

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CN102133679B (en) * 2011-01-29 2013-03-06 北京工业大学 Device and method for assisting gas metal arc welding by using externally applied magnetic fields
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