CN201537764U - Multi-electrode output arc welding power supply - Google Patents

Abstract

The utility model relates to a welding power supply with four output electrodes, which belongs to the field of welding. The utility model mainly includes: a DC constant voltage source, six bridge arms, three inductors, four output electrodes, a system control circuit, a feedback circuit and a drive circuit. The specific connection method is: three half-bridges composed of six bridge arms are connected in parallel between the positive terminal and the negative terminal of the voltage source, one end of the three inductors is electrically connected to the midpoint of the three half-bridges, and the other end The three controllable output electrodes of the power supply are respectively electrically connected, and the other electrode is electrically connected to the zero point of the DC voltage source. The utility model is a four-electrode output arc welding power supply. The output of three electrodes among the four output electrodes is flexible and controllable, and the four electrodes are coordinated with each other, which can meet various multi-electrode arc welding processes.

Description

Multiple-electrode output arc welding power supply

Technical field

The utility model is a kind of multiple-electrode output arc welding power supply, belongs to material processing field.

Background technology

Arc-welding is converted to heat energy to electric energy as a kind of traditional welding method by arc process, in order to filler wire (welding rod) or mother metal, to realize the connection of metal.The essence of arc welding process is the process of a kind of heat transfer, mass transfer and power transmission, and various technology of arc welding all is the combination of different heat, matter, power transmittance process, and this combination must guarantee welding process and welding quality stable.Ripe at present arc welding process, its heat transfer, mass transfer and power transmission all have a relatively-stationary collocation relation, and this also must determine each welding method that its rational range of application is all arranged.

Along with the structural design of welding product, material are selected, service condition varied, the welding job amount rises gradually, and is more and more higher to the requirement of quality of welded and efficient.Therefore, improve welding production efficiency and welding quality, the efficient welding method that reduces weld defect becomes an urgent demand of actual production.Improve quality of welded and efficient dual mode nothing more than, the one, on original welding technique, exploit potentialities, plant, develop magnetic-control high efficiency MAG welder skill, develop AC-MIG welder's skill, develop CMT (cold metal transition) technology as developing T.I.M.E. welder by the change protective gas on planting the basis raw-gas protection welder by additional mechanical force by electric arc reversal and Waveform Control by complementary field control, or the like; The 2nd, adopt of the same race and combination xenogenesis technology, as laser and electric arc carry out the compound TANDEM mariages technology of compound Laser-Hybird technology, two melt pole electrical arcs, with the be placed in two-sided pair of arc technology on workpiece two sides of two electric arcs, or the like.Above-mentioned novel arc welding process is all developed at special process requirements, promote the quality and the efficient of technology of arc welding greatly, expanded the range of application of technology of arc welding, but these technologies also has certain limitation from the fit angle of heat transfer, mass transfer and power transmission.

Multielectrode gas-shielded electric arc technology is the new in recent years a kind of arc welding process that proposes; different with traditional multi-electrode electric arc; workpiece can connect and also can not connect the homonymy that the source of welding current, welding electrode (welding wire or tungsten electrode) can be placed on workpiece and also can be placed on the workpiece both sides, may realize conducting heat on principle, the independent assortment of mass transfer and power transmission.

Data-searching shows, external Welder author just pays close attention to the multi-electrode arc welding from the seventies, from the angle that improves deposition efficiency and speed of welding theoretic discussion and experimental study are carried out in the multi-electrode arc welding, but because the restriction of power level at that time mostly concentrates on the submerged-arc welding field and all be multifibres multi sphere mode; And just just at the early-stage in recent years for the research of multifibres list arc mode, as professor Wang Yuanliang of Xi'an Communications University welding efficiency, the appearance of weld characteristics of Double Wire Single Arc Preheating Wire Filling Welding are studied; Professor Zou Zengda of Shandong University has carried out deep research to the twin electrode Arc Welding Process, carrying out at present the research work of mariages list arc gas shielded arc welding, adopt a power supply, between two electrodes, produce electric arc, workpiece does not participate in conduction, the heat of electric arc is mainly used in filler wire, has only a part of heat seldom to act on mother metal, improves deposition efficiency greatly; The abundant penetrating judgment of opening of Kentucky, United States university is awarded, and connects on the basis of technology at its double sides double arc that takes the lead in proposing, to the work that conducts a research of the arc stability of bipolar electrode list electric arc.

The research of above-mentioned multi-electrode electric arc, the welding equipment of employing all are traditional electric welding machine or their combination, and the stability control of arc origin system is subjected to the restriction of many-sided factor, and this has also limited the further performance of the advantage of multi-electrode Arc Welding Process simultaneously.Multi-electrode electric arc technology has proposed new challenge for traditional source of welding current, require power supply that two output electrodes of surpassing are arranged, and the size of the output current of each electrode will be coordinated with other electrode output mutually with polarity, to keep the stability of multifibres list Arc System.The circuit topology and the control system of existing inversion welding source all can not satisfy this demand.

The utility model content

The utility model proposes a kind of control method of source of welding current main circuit topological structure He each electrode output current of many output electrodes, can realize the output of four electrodes, wherein three electrodes can carry out constant voltage, constant current or the control of permanent power selection according to the actual process demand, an other electrode is according to other three electrode input adaptive control, also can be according to the actual welding process requirements, close the output of four one or two electrodes in the electrode, make this four electrodes out-put supply be reduced to three electrodes or the two electrode sources of welding current.

The utility model provides a kind of arc-welding power supply device with four output electrodes, and by form electric arc and the realization connection to workpiece between described four electrodes, concrete scheme is as follows:

The utility model comprises a dc constant voltage source, six three half-bridges, three inductance, four output electrodes, system, control circuit, current feedback circuit, voltage feedback circuit, power calculation circuit and drive circuits that brachium pontis is formed; Wherein:

Described four output electrodes are respectively the first output electrode A, the second output electrode B, the 3rd output electrode C and the 4th output electrode D, wherein the first output electrode A, the second output electrode B, the 3rd output electrode C are direct controllable electrodes, be used to connect welding gun, directly controllable electrodes can be exported direct current or interchange, and can carry out constant current, constant voltage or the control of permanent power to output.The 4th output electrode D is indirect controllable electrodes, is used to connect workpiece, the vector of four electrode output currents and be zero.

The dc constant voltage source is made up of the constant-voltage DC source of two series connection, has anode and negative terminal, and the tie point 1M of two constant-voltage DC sources links to each other with the 4th output electrode D.

Six brachium pontis are formed three half-bridges, are respectively the first half-bridge 2-1, the second half-bridge 2-2 and the 3rd half-bridge 2-3, and three half-bridges are parallel between the anode and negative terminal in dc constant voltage source 1.

Three inductance are respectively the first inductance 8a, the second inductance 8b and the 3rd inductance 8c, and the end of the first inductance 8a links to each other with the mid point 2A of the described first half-bridge 2-1, and the other end links to each other with described first electrode A; The end of the second inductance 8b links to each other with the mid point 2B of the described second half-bridge 2-2, and the other end links to each other with second electrode B; The end of the 3rd inductance 8c links to each other with the mid point 2C of described the 3rd half-bridge 2-3, and the other end links to each other with third electrode C.

Between first inductance and first output electrode, be connected with the first current measuring element 7a, between second inductance and second output electrode, be connected with the second current measuring element 7b, be connected with the 3rd current measuring element 7c between the 3rd inductance and the 3rd output electrode, the first current measuring element 7a, the second current measuring element 7b link to each other with system, control circuit 3 by current feedback circuit 4 respectively again with the 3rd current measuring element 7c; The output current of detected first electrode A of current feedback circuit 4 received current detecting elements, second electrode B and third electrode C, and feed back to system, control circuit.

First electrode A, second electrode B, third electrode C and the 4th electrode D link to each other with voltage feedback circuit 5 respectively, and voltage feedback circuit links to each other with system, control circuit 3; Voltage feedback circuit 5, be used to receive the voltage signal of first electrode A, second electrode B, third electrode C and the 4th electrode D, and calculate voltage between first electrode A, second electrode B, third electrode C and the 4th electrode D respectively, and feed back to system, control circuit.

Current feedback circuit 4, voltage feedback circuit 5 link to each other with system, control circuit 3 by power calculation circuit 6 respectively; The current signal of power calculation circuit 6 received current feedback circuits 4 and the voltage signal of voltage feedback circuit 5, and calculate the power output of first electrode A, second electrode B and third electrode C and feed back to system, control circuit 3.

System, control circuit 3 links to each other with the drive end of six brachium pontis respectively by drive circuit 10, the control signal that drive circuit receiving system control circuit 3 sends, and six brachium pontis of control opening or turn-offing after amplifying.

Described six brachium pontis are respectively the first brachium pontis V1, the second brachium pontis V2, the 3rd brachium pontis V3, the 4th brachium pontis V4, the 5th brachium pontis V5 and the 6th brachium pontis V6, each brachium pontis constitutes by a semiconductor switching device, semiconductor switching device is a kind of device with a control utmost point and conducting when the control utmost point is provided a control signal, wherein the first brachium pontis V1 and the second brachium pontis V2 form the first half-bridge 2-1, the 3rd brachium pontis V3 and the 4th brachium pontis V4 form the second half-bridge 2-2, and the 5th brachium pontis V5 and the 6th brachium pontis V6 form the 3rd half-bridge 2-3.The method of attachment of first half-bridge is that the current output terminal of first brachium pontis links to each other with the current input terminal of second brachium pontis, and the method that links to each other of second half-bridge and the 3rd half-bridge is identical with first half-bridge.System, control circuit 3 comprises that six the road drive signal generating circuit, six the road drive signal generating circuit according to the actual welding demand, controlling described six brachium pontis in sequence opens or turn-offs, thereby control the output of three direct controllable electrodes, be specially: system, control circuit 3 sends the driving signal for the first brachium pontis V1, block the second brachium pontis V2 simultaneously and drive signal, then first electrode A output positive current; Give the second brachium pontis V2 when system, control circuit and send the driving signal, block the driving signal of the first brachium pontis V1 simultaneously, then first electrode A output negative current; If system, control circuit driven, blockade first brachium pontis alternately block, drive second brachium pontis, the then first electrode output AC electric current simultaneously; The control method of the second output electrode B and the 3rd output electrode C is the same with the control method of the first output electrode A.Described six the road drive signal generating circuit all includes pulse-width modulation circuit, regulates the pulsewidth that drives signal by the value of setting and the value of feedback of relatively output, thereby realizes constant current, constant voltage or the control of permanent power of each output stage.

System, control circuit 3 can be controlled three direct controllable electrodes output currents that link to each other with welding gun and be zero, thereby makes not output current of the indirect controllable electrodes that is connected with workpiece.System, control circuit also can control three with output electrode that welding gun links to each other in any one or two output current be zero, thereby make the source of welding current of four output electrodes be reduced to the Arc Welding Powers of three outputs or two outputs.

The utlity model has following advantage: the utility model is a kind of four electrode output arc welding power supplies, the output flexible and controllable of three electrodes in four output electrodes, and coordinate mutually between four electrodes, can satisfy various multi-electrode Arc Welding Process.

Description of drawings

Fig. 1 is a kind of circuit block diagram with multi-electrode arc-welding power supply device according to the utility model one embodiment.

The specific embodiment

Should clear and definite the utility model before in detail explaining at least one embodiment of the present utility model be not limited in following introduction, illustrate or accompanying drawing in its structure detail of showing and the application on the arrangements of elements.The utility model can have other embodiment or practice in many ways or realize.Also term that should clearly adopt below and buzz word only limit to task of explanation and should not be considered to a kind of restriction.

Figure 1 shows that a kind of four electrode arc-welding power supply devices, comprise dc constant voltage source 1, six brachium pontis (V1, V2 according to a kind of embodiment of the utility model, V3, V4, V5 V6) forms three half-bridge (2-1,2-2,2-3), three inductance (8a, 8b, 8c), four output electrodes (A, B, C, D), system, control circuit 3, current feedback circuit 4, voltage feedback circuit 5, power calculation circuit 6, drive circuit 10.

Dc constant voltage source 1, (1a 1b) forms, and has anode 1P, negative terminal 1E by the constant-voltage DC source of two series connection; The mid point 1M of two dc sources is directly output as the 4th electrode D, is used to connect workpiece 11.

Six brachium pontis (V1, V2, V3, V4, V5 V6), forms three half-bridges (the first half-bridge 2-1, the second half-bridge 2-2, the 3rd half-bridge 2-3) and is parallel between the anode 2P and negative terminal 2E of voltage source.

Three inductance (8a, 8b, 8c) be respectively first inductance, second inductance and the 3rd inductance, first inductance, second inductance and the 3rd inductance one end are electrically connected on the described first half-bridge 2-1 respectively, mid point (2A, the 2B of the second half-bridge 2-2 and the 3rd half-bridge 2-3,2C), the other end of first inductance, second inductance and the 3rd inductance be electrically connected on respectively on three controlled output electrodes of power supply (A, B, C).

First inductance, second inductance, the 3rd inductance and electrode A, B, C, between current measuring element 7a, 7b, 7c are installed, current measuring element 7a, 7b, 7c link to each other with current feedback circuit 4 respectively, current feedback circuit 4 links to each other with system, control circuit 3.

Electrode A, B, C, D link to each other with voltage feedback circuit 5 respectively, and voltage feedback circuit links to each other with system, control circuit 3.

Current feedback circuit 4, voltage feedback circuit 5 link to each other with power calculation circuit 6 respectively, and power calculation circuit 6 links to each other with system, control circuit 3.

System, control circuit 3 links to each other with drive circuit 10, drive circuit 10 respectively with six brachium pontis (V1, V2, V3, V4, V5, drive end V6) links to each other.

Above-mentioned dc constant voltage source is suitable for providing enough power output to a weld load that is made of three welding electrodes and workpiece.

Six brachium pontis (V1, V2, V3, V4, V5, V6) be made of a semiconductor switching device, semiconductor switching device can be a kind of device with a control utmost point and conducting when the control utmost point is provided a control signal, for example MOSFFET (MOS memory) or IGBT (igbt) etc.Each half-bridge of three half-bridges, when last brachium pontis is opened down the brachium pontis shutoff, the output cathode electric current, when brachium pontis is opened the brachium pontis shutoff instantly, the output negative pole electric current.Brachium pontis turn-offs also can to allow brachium pontis open down in first cycle in very first time section, brachium pontis is opened the brachium pontis shutoff under very first time section allowed in second cycle, repeat the state in the very first time section in the next again time period, so circulation, then exportable alternating current.

Current feedback circuit 4 is used for the output current of received current detecting element 7a, the detected electrode A of 7b, 7c, B, C, and feeds back to the chip controls circuit after adjusting.

Voltage feedback circuit 5 is used for the voltage signal of collecting electrode A, B, C, D, and calculates the voltage (being the voltage between each welding gun and the workpiece) between electrode A, B, C and the electrode D respectively, and feeds back to system, control circuit.

Power calculation circuit 6 is used for the current signal of received current feedback circuit 4 and the voltage signal of voltage feedback circuit 5, and calculates the power output of output electrode A, B, C and feed back to system, control circuit 3.

Drive circuit 10 is used for receiving system and controls the control signal that 3 circuit send, six brachium pontis of control after amplifying (V1, V2, V3, V4, V5, opening or turn-offing V6).

Electrode A, B, C in four output electrodes (A, B, C, D) are direct controllable electrodes, and electrode D is indirect controllable electrodes.

System, control circuit 3 comprises that six the road drive signal generating circuit and overheated, current foldback circuit; the six road main effects that drive signal generating circuit are according to the actual welding demand; control described six brachium pontis (V1 in sequence; V2; V3, V4, V5; V6) open or turn-off, thereby control the output of three direct controllable electrodes (A, B, C).Power supply is selected direct current when output for use, and when the output of an electrode is set to timing, then system, control circuit sends the driving signal for the switching device of the last brachium pontis in the half-bridge that electrode pair therewith answers, and blocks the driving signal of the switching device of second brachium pontis simultaneously; When the output of an electrode is set to when negative, then system, control circuit sends the driving signal for the switching device of the following brachium pontis in the half-bridge that electrode pair therewith answers, and blocks the driving signal of the switching device of first brachium pontis simultaneously.Power supply is selected for use when exchanging output, system, control circuit can be controlled the initialization time of each electrode according to set starting phase angle, calculate ac cycle according to set a-c cycle then, in first time period in each cycle, the switching device of the last brachium pontis in the half-bridge of answering to electrode pair takes place to drive signal, blocks the driving signal of the switching device of second brachium pontis simultaneously; In second time period in each cycle, the switching device of the following brachium pontis in the half-bridge of answering to electrode pair takes place to drive signal, blocks the driving signal of the switching device of first brachium pontis simultaneously.In addition, each road drives signal generating circuit and all includes pulse-width modulation circuit (PWM), regulates the pulsewidth that drives signal by the value of setting and the value of feedback of relatively output, thereby realizes constant current, constant voltage or the control of permanent power of each output stage.Holding circuit is used for monitoring the temperature of electric current and each switching device of each output stage, as overcurrent, when superheating phenomenon takes place, blocks each drive circuit immediately.

System, control circuit also can block an electrode or two pairing driving signals of electrode in three controllable electrodes according to the actual welding demand, thereby realizes output of three electrodes or the output of two electrodes.

System, control circuit can be controlled the output current of three direct controllable electrodes, thereby controls the output of another indirect controllable electrodes indirectly.

In addition; many output stages source of welding current of the present utility model is called another patent application about multielectrode gas-shielded welding process method of " double-sided multi-electrode penetrable electric arc welding method " as the name that cooperates the applicant's application; can realize heat, the matter between weld seam and mother metal, the independent assortment of power, promptly realize the global function welding.

Claims (5)

1. The multi-electrode output arc welding power supply is characterized in that it includes a DC constant voltage source, three half-bridges composed of six bridge arms, three inductors, four output electrodes, a system control circuit, a current feedback circuit, and a voltage feedback circuit. circuit, power calculation circuit and drive circuit; where: The four output electrodes are respectively the first output electrode, the second output electrode, the third output electrode and the fourth output electrode, wherein the first output electrode, the second output electrode and the third output electrode are directly controllable electrodes, It is used to connect the welding gun, the direct controllable electrode can output DC or AC, and can control the output with constant current, constant voltage or constant power; the fourth output electrode is an indirect controllable electrode, which is used to connect the workpiece, and the four electrodes output current The vector sum of is zero; The DC constant voltage source is composed of two constant voltage DC power supplies connected in series, with a positive terminal and a negative terminal, and the connection point of the two constant voltage DC power supplies is connected to the fourth output electrode; The six bridge arms form three half-bridges, namely the first half-bridge, the second half-bridge and the third half-bridge, and the three half-bridges are connected in parallel between the positive terminal and the negative terminal of the DC constant voltage source; The three inductances are respectively the first inductance, the second inductance and the third inductance, one end of the first inductance is connected to the midpoint of the first half-bridge, and the other end is connected to the first electrode; the second inductance One end is connected to the midpoint of the second half-bridge, and the other end is connected to the second electrode; one end of the third inductor is connected to the midpoint of the third half-bridge, and the other end is connected to the third electrode; A first current detection element is connected between the first inductance and the first output electrode, a second current detection element is connected between the second inductance and the second output electrode, and a second current detection element is connected between the third inductance and the third output electrode. There is a third current detection element, the first current detection element, the second current detection element and the third current detection element are respectively connected to the system control circuit through the current feedback circuit; the current feedback circuit receives the first electrode detected by the current detection element , the output current of the second electrode and the third electrode, and feed back to the system control circuit; The first electrode, the second electrode, the third electrode and the fourth electrode are respectively connected to the voltage feedback circuit, and the voltage feedback circuit is connected to the system control circuit; the voltage feedback circuit is used to receive the first electrode, the second electrode, the third electrode and the The voltage signal of the fourth electrode, and respectively calculate the voltage between the first electrode, the second electrode, the third electrode and the fourth electrode, and feed it back to the system control circuit; The current feedback circuit and the voltage feedback circuit are respectively connected to the system control circuit through the power calculation circuit; the power calculation circuit receives the current signal of the current feedback circuit and the voltage signal of the voltage feedback circuit, and calculates the first electrode, the second electrode and the third electrode. Power output and feedback to the system control circuit; The system control circuit is respectively connected to the driving ends of the six bridge arms through the drive circuit, and the drive circuit receives the control signal sent by the system control circuit, and controls the opening or closing of the six bridge arms after amplifying. 2. The multi-electrode output arc welding power source according to claim 1, characterized in that: the six bridge arms are respectively the first bridge arm, the second bridge arm, the third bridge arm, the fourth bridge arm, and the fifth bridge arm The bridge arm and the sixth bridge arm, each bridge arm is composed of a semiconductor switching device, a semiconductor switching device is a device that has a control pole and is turned on when the control pole is provided with a control signal, wherein the first bridge The bridge arm and the second bridge arm form the first half bridge, the third bridge arm and the fourth bridge arm form the second half bridge, the fifth bridge arm and the sixth bridge arm form the third half bridge, and the connection method of the first half bridge is The current output end of the first bridge arm is connected to the current input end of the second bridge arm, and the connection method between the second half bridge and the third half bridge is the same as that of the first half bridge. 3. The multi-electrode output arc welding power source according to claim 2, characterized in that: the semiconductor switching device is MOSFET or IGBT. 4. The multi-electrode output arc welding power source according to claim 1, characterized in that: the system control circuit controls the sum of the output currents of the three directly controllable electrodes connected to the welding torch to be zero, so that the indirectly controllable electrodes connected to the workpiece The control electrode does not output current. 5. The multi-electrode output arc welding power supply according to claim 1, characterized in that: the system control circuit controls the output current of any one or two of the three output electrodes connected to the welding torch to be zero, so that the four output The welding power supply of the electrode is simplified to a three-output or two-output arc welding power supply.

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