CN1695866A - Welding control method of diplonema MAG and welding source - Google Patents
Welding control method of diplonema MAG and welding source Download PDFInfo
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Abstract
A dual-wire MAG welding control method features that the welding current feedback and voltage feedback are compared with the given signals in time shared mode, a control circuit is used to control welding, and during the welding two welders with constant frequency are used by keeping certain phase relation for high stability. Its welding power supply features that its controller uses a switching circuit consisting of current sampler, voltage sampler, switching switch, comparator, integral proportioner and amplifier connected to welding power output unit.
Description
Technical field
The present invention relates to be used for the control method and the source of welding current thereof of mariages MAG welding, belong to welding equipment and automatic field.
Background technology
Mariages MAG weldering also still is in developing stage at present as a kind of feasible efficient welding method, and everybody is also incomplete same to the understanding of this method, and the view of some particular problems is not also reached common understanding.From the form of its technology, mainly contain two kinds now, a kind of is synchronously two arcs (Twin arc), and another kind is separate double arc (Tandem), and the process characteristic of these two kinds of forms is different.For this form of Twin arc system, adopt two identical pulse sources of welding current (also can only use a power supply), two cover wire feeders, the ignition tip (two rhizoids are not mutually insulateds) that can hold two root bead silks, a shared molten bath.During welding, two power supply output pulse frequencies are identical, and the electric current that two welding wires pass through is also identical, and promptly two rhizoids are melted in the molten bath with identical speed.The advantage of Twin arc is exactly, and utilizes arc self-regulation, need not coordinating communication control between two power supplys, and system is simple relatively, as shown in Figure 1.But its shortcoming also clearly, and such as the poor controllability of electric arc, the power that influences each other between two root bead silks is bigger, is difficult to the accurately fusing and the droplet transfer of control two root bead silks.And this form of Tandem system as shown in Figure 2, also be to adopt two identical pulse sources of welding current, two cover wire feeders, different is the ignition tip that adopts two mutual insulatings, coordinate control by communication between two power supplys, the welding process that makes two power supplys is more rapidly with perfect.These two power supplys, pulse energy is constant, guarantees when any electric current molten drop of a pulse transition.With the different of Twin arc system maximum be exactly, the Tandem system can make two power supplys that different welding parameters is set respectively, each other can be by coordinating control, and the mutual interference degree in the time of so just can reducing the big electric current of double wire welding between the electric arc.Therefore, the Tandem welding method obtains the general high praise of industry.No matter yet which kind of process form, existing product all is not satisfactory especially at aspects such as arc stability and appearance of weld and phase place controllabilitys, and it is big to splash.Trace it to its cause, this is because improper the causing of control method of the inverter that adopts.
The control method of the present most welding inverter power sources pair closed loop control methods that adopt more, outer shroud is a Voltage loop, interior ring is an electric current loop, described in patent ZL99103518.6.The quantity of state of its control is an electric current I, and for the different welding methods that have the different welded condition stage, though the current waveform of each stage control requires difference, its feedback quantity but is the individual quantities electric current, does not therefore have the signal switching problem.The control method of this widespread in inverter type welder abbreviates two constant currents or many constant current control methods as, as described in patent 03127961.9.In the impulse welding termination process, be one in an arteries and veins for guaranteeing transient process, the time of its stage pulse and the size of pulse current all remain unchanged, but change the pulse base value time, so its frequency changes all the time.Yet for the mariages MAG welding of adopting Tandem technology, because welding machine and wire-feed motor are by two formations, in order to reduce the mutual interference of two welding equipment phases, improve welding stability, so just need between two welding equipments, set up the working mechanism of mutual coordination, promptly should make it stably work in predetermined state by coordinating the method for control.Therefore, when two welding machines were operated in relatively-stationary frequency, widespread just showed its inadaptability in two constant currents and many constant current control methods of monofilament welding equipment.And, even if adopting some other ways can control two welding machine phase relations fixes, also mostly is to be limited to homophase and anti-phase these two extreme cases, and it is adjustable arbitrarily adapting to different welding situations to reach phase place, so its application is very restricted.
Summary of the invention
Based on widespread in the control method of monofilament welding and the deficiency of existing mariages MAG welding control method, the objective of the invention is: adopt Tandem technology, propose a kind ofly can well control two welding machine co-ordinations, guarantee arc stability and good appearance of weld, reduce the controlled mariages MAG inversion welding control method and the corresponding source of welding current of phase place of the phase mutual interference of two electric arcs.
Double wire welding system control method proposed by the invention, it is characterized in that: it is a kind of welding current feedback and voltage feedback to be required timesharing and corresponding given signal comparison according to predetermined, and control main circuit by control circuit and weld, guarantee that in welding process welding frequency is constant, thereby two welding machines keep certain phase relation to guarantee the method for welding stability; This kind method is to realize respectively in two double wire welding power supplys with intercommunication mutually.Its system comprises main circuit part 8 and control circuit part 9, and wherein control circuit part 9 comprises core control section A again, control operating part B, peripheral unit control and operating part C, the input of front panel and keyboard/display part D.Wherein the input of control circuit part 9 comprises the coordination control signal C1 of the welding current sampling B1, voltage sample B2 and another welding machine that derive from main circuit part 8, the inverter circuit 8.3 and the wire-feed motor of its output control main circuit; Specifically, it mainly may further comprise the steps successively:
1) at first according to actual requirement, determines welding parameter: comprise wire feed rate V, crest voltage Up, time to peak Tp, frequency F, background current Ib, phase relation DLY; Its function realizes by the input and the keyboard/display part D of front panel;
2) when welding is carried out, frequency F and the time to peak Tp timer numerical value of determining stage pulse and base value stage correspondence according to input, and the startup software timer interrupts controlling automatically conversion, make it in the pulse base value stage, the given signal of output and the feedback signal of taking are given signal of electric current and current feedback signal, promptly guarantee the constant of electric current; In the peak value of pulse stage, the given signal of output and the feedback signal of taking are voltage given signal and voltage feedback signal, make welding machine at different different control signal and the given signals of welding stage output.Constitute different closed-loop controls thus, thereby guarantee to realize stable welding under the constant condition of every welding machine frequency, this realizes by control circuit part 9.Given A2 and switching signal A3 are according to parameter preset, and voltage and current control is finished in conversion simultaneously between base value and peak value;
3) in welding process, main welding machine is when being converted to peak value by base value, will be by serial communication circuit C1 to send a serial communication signals from welding machine, from welding machine by serial communication circuit C1 itself after receiving this signal, be set and be the base value stage, and, determine this base value time according to given phase relation DLY value, finish any designated phase difference control; This step interrupts realizing by serial communication.
4) in process 3) in, if receive the interrupt signal that main welding machine sends, then will weld according to own original default parameter, till the serial communication signals of receiving main welding machine from welding machine because factors such as interference fail to make from welding machine.
Design philosophy of the present invention is: for the selection of control method, also be core of the present invention, adopt the voltage-to-current control method.So-called voltage-to-current control method guarantees respectively in welding process that promptly crest voltage (Up) and background current (Ib) are constant.Its principle is: in the peak value of pulse stage, feedback signal is taked voltage, guarantee that voltage is a definite value, arc length is then recovered the main variation that relies on peak point current and is caused that average current changes and regulate that the regulating power of system is relevant with the maximum output current of power supply if electric arc is interfered.This mode is actually a kind of flat generator characteristic at peak phase.When arc length changes, the current deviation Δ I2 that this external characteristics produces will be greater than the current deviation Δ I1 with the decline generator characteristic, and it is fast that burn-off rate also just changes, that is the arc length of flat generator characteristic recover fast, self regulating action of power supply Arc System is stronger.This control mode can reach stable transient process of an arteries and veins by the adjustment of broad peak point current Ip scope in certain pulsewidth time T p scope.In the pulse base value stage, feedback signal is taked electric current, promptly guarantees the constant of electric current, thereby makes electric arc guarantee current stabilization in this stage, and the assurance arc stability burns and do not extinguish.Pattern has determined that whole pulse process frequency is constant thus, thus can be stable be operated under the predetermined phase difference, realize default welding process.
The source of welding current according to method design of the present invention, mainly comprise main circuit part 8 and be the control circuit part 9 of control centre that it is characterized in that: described control circuit part 9 adopts commutation circuit B and SCM system to link to each other with the power supply of another welding machine by serial communication circuit C1 with the single-chip microcomputer.Described commutation circuit B mainly comprises current acquisition circuit B1 and the voltage collection circuit B2 that input partly links to each other with main circuit respectively, and change-over switch B3, the comparing element B4, integration proportional controller B5, pulse-width modulation circuit B6, the IGBT drive circuit B8 that connect in turn.Wherein change-over switch B3 comprises two inputs, output and a control end: two inputs link to each other with electric current, voltage collection circuit B1, B2 respectively, control end links to each other with the switching signal A3 of SCM system output, control regularly switching by switching signal A3 from single-chip microcomputer, make it switch to collection voltage at the weld pulse peak phase, switch to the collection electric current in the weld pulse base value stage, output disconnecting comparing element B4.Another input of comparing element B4 links to each other with the given signal A2 of SCM system output, its function is to be used for finishing from the feedback current of B1 with from the feedback voltage of B2 and comparison from the value of given A2, and its difference is input to the integration ratio and regulates (PI) B5.Another of pulse-width modulation circuit B6 is input as holding circuit B7, and IGBT drive circuit B8 is output as inverter circuit 8.3.
Described control circuit part 9 mainly comprises core control section A, control operating part B, peripheral unit control and operating part C, the input of front panel and keyboard/display part D; Described core control section A is made up of SCM system A1, and the importation comprises current sample B1 and the voltage sample B2 that is input to A/D conversion A4 and is input to the voltage sample B2 that judges A5 in short circuit.Wherein A/D conversion A4 is used for passing through the processing of 80C196KC SCM system and display part D when welding, shows actual welding electric current and magnitude of voltage in real time; Short circuit is judged when signal A5 guarantees that short-circuit conditions takes place in welding process, SCM system energy acquired information; Described peripheral unit control and operating part C comprise that carrying out core control section A is input to the arc welding gun switch C3 of SCM system A1, given C4 of wire feed and the air valve C5 that input links to each other with SCM system A1 by photoelectricity isolated part C2 with serial communication C1, photoelectricity isolated part C2, the output that another welding machine carries out two-way communication by photoelectricity isolated part C2, the wire-feed motor alignment circuit C6 that input and the given C4 of wire feed, output link to each other with outside wire-feed motor; The welding parameter that keyboard display driver circuit D1 that input links to each other with SCM system A1, the welding parameter that input links to each other with keyboard display driver circuit D1 show that D3, output link to each other with SCM system A1 by keyboard display driver circuit D1 of comprising the input of described front panel and display part D presets the given D2 of coding knob that D4, output link to each other with SCM system.
Compared with prior art, the control method and the welding machine electric power of the present invention's employing have the following advantages:
1, welding process is stable, and it is little to splash, and arc stability is strong.Because the inventive method adopts the U/I control model, can better control the annoyance level of two electric arcs, select more excellent processing parameter matching, so can improve arc stability and reduction is splashed.
2, welding conditions are wide, and phase place can be mated arbitrarily.Welding machine according to control thought of the present invention is set up adopts two welding machines to intercom mutually, realizes that by software control the phase relation of two welding machines is mated, and can realize the phase adjusted control of two welding machines from complete homophase to complete anti-phase.
3, constantly switch between voltage and current by sampled signal, welding machine is operated under the relatively-stationary frequency, has guaranteed the stability of welding.And switch circuit because increased by one, increased the flexibility of welding machine control, when only needing voltage or a kind of sampled feedback signal of electric current, by make switching signal A3 put height or put low, same being suitable for, thus increased the flexibility of welding machine control greatly.
Description of drawings
Fig. 1 Twin arc welding system sketch
Fig. 2 Tandem welding system sketch
For Fig. 1 and Fig. 2, wherein: the 1-source of welding current, 2-tip, 3-wire-feed motor, 4-workpiece, 5-electric arc, 6-welding wire, the interface channel of two welding machines of 7-.
Fig. 3 machine structure composition diagram
Fig. 4 controls the physical circuit of operating part B
Fig. 5 main program software scenario figure
Fig. 6 welding procedure block diagram
Fig. 7 AD interrupts block diagram
Fig. 8 software timer interrupts block diagram
Two welding machines of Fig. 9 are walked the CIP block diagram
The specific embodiment
To describe this example in conjunction with the accompanying drawings now.
This example adopts pattern shown in Figure 2.
Example of the present invention separate unit machine structure composition diagram as shown in Figure 3, main generally two parts that comprise: source of welding current main circuit part 8 and be control core circuit part 9 with 80C196KC.The main circuit input voltage is three-phase 380V; Input rectifying 8.1 adopts Fuji's rectifier bridge rectification, and model is FUJ6RI100G-160; Inverter circuit 8.3 adopts the full-bridge inverting structure, and the IGBT that is BSM150GB120DN2 by four models forms; Intermediate-frequency transformer 8.4 adopts the ultracrystallite magnetic core, and transformation ratio is 15: 2; Magnetic core pulsactor, the about 40 μ H of inductance value are adopted in filtering 8.6; Control section adopts the control system based on the 80C196KC single-chip microcomputer, mainly finishes SECO, and can realize that the phase relation of two welding machines changes between 0 to 180 degree; Keyboard/display part adopts 8279 keyboards/display chip to realize that the management of keyboard and the dynamic scan of charactron show.Below in conjunction with accompanying drawing it is elaborated.
Its job order is: after three-phase input 380V alternating current at first partly carries out rectification and 8.2 filtering through 8.1 input rectifyings, become the direct current of 540V.After this become the alternating current of 20KHZ after this direct current is isolated through the step-down of (this is partly controlled by control circuit) inversion of 8.3 inverter circuits and 8.4 intermediate-frequency transformers, become the used big current low voltage direct current of welding then after the filtering through 8.5 output rectifiers and 8.6, supply with the output of 8.7 bonding powers.Because the operating frequency of above circuit is 20KHZ, outputting inductance also very little (about 40 μ H) is adjusted the control that inverse switch frequency or pulsewidth can reach the microsecond level simultaneously, so the type power supply reaction speed is fast, dynamic property is good.
The composition and the function of each several part are respectively:
Core control section A mainly is made up of the 80C196KC single-chip microcomputer, and its importation comprises that the current sample B1 signal and the voltage sample B2 signal that are input to A/D conversion A4 weld real-time weldingvoltage current value with acquisition; Be input to short circuit and judge the voltage sample B2 signal of A5, obtain short-circuit signal, reach the purpose of monitoring welded condition.Another importation obtains from portion C, comprises the coordination control information input of another welding machine that obtains and isolate the arc welding gun switch signal (C3) that (C2) back obtains by photoelectricity from serial communication circuit (C1).The 3rd input part assigns to show input driving circuit (D1) and coding knob given (D2) part in the keyboard of part D, obtains the welding initial parameter.Part A is mainly finished the response of welding parameters input and external signal as the core control section, and handles and transform the back through software B, C, D three parts are controlled, and makes whole welding system co-ordination, finishes predetermined welding purpose.
Hardware components of the present invention mainly at control operating part B, is characterized in that: added the conversion that change-over switch B3 controls feedback signal.Its importation is current sample B1 and the voltage sample B2 that derives from bonding power output 8.7; and the control of switching signal A3 in deriving from part A; timesharing turn-on current sampling B1 and voltage sample B2; then with the given A2 of corresponding period through comparing element B4 relatively after; be input to the integration ratio and regulate (PI) B5; after handling, signal outputs to pulse-width modulation circuit B6; be input to the guard signal that derives from holding circuit B7 in addition of B6 simultaneously; these two signals are after the PWM of B6 pulsewidth modulation; be input to IGBT drive circuit B8; be input to inverter circuit 8.3 after treatment, finish this control function.The physical circuit of B3, B4, B5 is as shown in Figure 4: wherein U1A is change-over switch B3, this example adopts H4053, its pin 1,2 meets voltage sample B2 and current sample B1 respectively, pin 10 meets switching signal A3 by resistance R 1, pin 15 is an output pin, its output signal and given signal A2 are input to the negative-phase input (2 pin) of amplifier U2 (CA3140) after relatively, constitute the integration ratio by feedback resistance R6 and capacitor C 1 and regulate (PI), and output to pulse-width modulation circuit B6 through resistance R 7.Wherein D1, R8, R9 constitute pressure limiting circuit, avoid R7 to output to the overtension of pulse-width modulation circuit B6.
Portion C is peripheral unit control and operating part.Wherein serial communication C1 is carrying out the two-way communication of this TV station welding machine core control section A and another welding machine, the coordination control and the signal feedback that comprise two welding machines, make it can work in predetermined form, keep two welding machines to work asynchronously on request or differ certain phase angle.Photoelectricity isolated part C2 is then carrying out and is deriving from the input of arc welding gun switch C3 to part A, and part A is to the output control of given C4 of wire feed and air valve C5.Wherein C4 reaches the purpose of the outside wire-feed motor of control again by wire-feed motor alignment circuit C6, makes itself and welding machine co-ordination.
Part D is the input and the keyboard/display part of front panel.Welding parameter presets D4 by keyboard display driver circuit D1 and the given D2 of matching coding knob, to core control section A input, realizes the setting of welding parameter, and shows that by welding parameter D3 shows.When welding, core control section A exports to welding parameter and shows D3 by keyboard display driver circuit D1, shows welding current and voltage, makes its energy real-time monitored welding parameter.
Because whole welding process of the present invention all carries out under the SCM system programme-control, so below in conjunction with control method of the present invention, and with reference to program flow diagram this example is further elaborated.
Fig. 5 is Single-chip Controlling mariages MAG GMAW inversion welding source main program software scenario figure.Software main program comprises: initialization subroutine, preset parameter, demonstration and counting subroutine, striking subprogram, time delay subroutine and welding subprogram.The concrete execution sequence of its main program is: behind the electrification reset, program brings into operation from initial address (80C196KC is 2080H), and system carries out initialization subroutine earlier, finishes the initial value of each parameter and sets.Turn-offing interrupt requests then, carry out the keyboard scan program, whether have operating key press, and carry out respective handling if detecting.Given in conjunction with coding knob in the high speed input checking subprogram of carrying out subsequently, obtain wire feed rate V, crest voltage Up, time to peak Tp, frequency F, welding parameters such as background current Ib, phase relation DLY are used for Control Welding Process, through display subroutine relevant parameter is set then to show.Calculation procedure is determined base value time T b=1/F-Tp according to the system clock that single-chip microcomputer adopted, and determines that according to the time of each count cycle the counter cycle of base value time and time to peak correspondence counts Nb and Np, uses for the control conversion.For other given parameter, then, be converted into corresponding machine program value according to concrete welding machine parameter.For in the high speed input subroutine if the welding switching signal is arranged through judgement, check that then the arc welding gun switch register has not open command, have then to change striking, welding procedure over to, up to detecting the welding end signal, withdraw from welded condition.Carry out the front program as not welding the commencing signal circulation once more of then delaying time behind the certain hour (as 20ms).
The concrete execution sequence of its main program is: behind the electrification reset, program brings into operation from initial address (80C196KC is 2080H), at first system is carried out initialization, comprises the definition of each parametric variable and register etc.At preset parameter and calculating section, the scanner uni that program will at first be carried out each parameter shows, and the welding parameter of user's input is deposited in corresponding registers and variable.Program will be calculated according to this parameter input subsequently, be converted into the relevant respective value of hardware to carry out follow-up welding control.To being used for software interrupt control, then at first calculate the base value time by frequency F and time Up to the required Counter Value of the control of switching signal A3 and given A2:
According to the time of each counter cycle, determine the Counter Value Np and the Nb of Tp and Tb correspondence then.When welding signal takes place, program will be carried out the striking program, and control otherwise enter welding procedure if there is the welding signal of stopping will to jump out program this moment.
Be illustrated in figure 6 as the welding procedure block diagram, mainly handle required processing of carrying out in real time and judgement in the welding process.Its process is: at first the welding situation is carried out " preliminary treatment ", " setting electric current " then, next " drawing arc not " judged, then do not carry out judgement " stopping welding denys " if do not drawing arc, if stop welding, then withdraw from, otherwise rebound carried out current settings again and drawing the circulation of arc whether judgement.If drawing arc through being judged as, then hold " open string work letter ", carry out two machine communication control." setting A/D and software timer interrupts " then.Next " establish background current ", " establishing the welding parameter flag bit " starts " setting software timer break period ".Certain hour carries out cycle criterion to " the welding stop signal being arranged not " at interval then, and the wait stop signal stops welding and jumps out program when taking place, otherwise circular wait is judged and the response interruption.
Control method of the present invention is mainly reflected in the welding procedure process, will control by respective interrupt in this process:
AD interrupts realizing the welding current of welding process and the real-time detection of weldingvoltage, and shows;
Software timing interrupts finishing the control of welding switching signal A3 and given A2;
Serial communication interrupts finishing two welding machine phase relation controls;
Accompanying drawing 7 interrupts block diagram for AD.When being welding, major function realizes the Presentation Function of weldingvoltage and electric current.Its implementation is: at first carry out pretreatment operation, finish some necessary settings, judge it is electric current or voltage then, and, reset sampling time next time and sample variation (realizing this operation) then by being provided with of timer and corresponding registers control bit according to sampling and demonstration that the result carries out curtage respectively.
Fig. 8 interrupts block diagram for software timer.This subprogram is mainly the base value of realization weld pulse and the size and the conversion and control of peak value, and given signal A2 and switching signal A3 among decision Fig. 3 control the conversion of voltage/current in real time and implement.Program is at first carried out " preliminary treatment ", comprises keeping the scene intact and timer value and base value, peak flag position are provided with.Judge " the welding gun input is arranged " then, then carry out judgement when not having and " then deny ", there is the welding gun input then to carry out " setting flag bit ", carry out then and judge " then denying ",, otherwise its execution " being background current " is judged if then then jump out program, be then " handle given and switching signal be electric current ", otherwise " handle given and switching signal be voltage ", " reduction is on-the-spot " jumps out this program then.
Fig. 9 is two welding machine serial communication interrupt routine block diagrams.Its function is according to actual requirement, and the phase relation of two welding machines of control is to guarantee two welding machine co-ordinations.When welding, main welding machine all sends the signal interruption request of coordinating in the particular moment of each welding interval, and responds interruption after welding machine is received this serial interrupt requests, requires the duty of control from welding machine according to default phase place.Adopt the benefit of external interrupt to be, not only software control is simple, and when the coordination signal that causes main welding machine to send owing to the interference in the transmission course or other reason fails to be taken place by situation about receiving from welding machine, can carry out corresponding welding control according to oneself predetermined welding procedure from welding machine, avoid from welding machine owing to receiving the wrong phenomenon of losing welding interval that causes.The interrupt procedure that concrete serial is interrupted is: when take place to interrupt corresponding after, welding process is set at the base value stage, set the time in base value stage then and wait for then, then carry out welding operation after then to jump out up to returning.
This double wire welding equipment welds for sheet metal, when adopting Φ 1.2mm welding wire, can realize 3m/min (thickness of slab δ=2mm) and 2m/min (the stable welding of high speed of thickness of slab δ=3mm), for slab, can realize the deposition rate of 10Kg/h, it is low to splash, forming, arc stability tightly only is 1.5m/min than the highest speed of welding of monofilament, has improved efficient greatly.The requirement that reaches design and use.
The above is an example of this equipment and control method thereof, and we also can carry out some conversion to it.Can adopt half-bridge inversion circuit to replace the full-bridge form such as the main circuit part, control section replaces 80C196KC to realize its function with DSP or other single-chip microcomputers, and SD7218 replacement 8279 etc. can be adopted in the display part.As long as it is consistent that its control thought and the present invention are narrated, all should be considered as the included scope of the present invention.
Claims (3)
1, a kind of mariages MAG welding control method, it is characterized in that: it is a kind of welding current feedback and voltage feedback to be required timesharing and the comparison of given signal according to predetermined, and control main circuit by control circuit and weld, guarantee that in welding process welding frequency is constant, thereby two welding machines keep certain phase relation to guarantee the method for welding stability; This kind method is to realize respectively in two double wire welding power supplys with intercommunication mutually; Its system comprises main circuit part (8) and control circuit part (9); Wherein control circuit part (9) comprises core control section (A) again, control operating part (B), peripheral unit control and operating part (C), the input of front panel and display part (D); Wherein the input of control circuit part (9) comprises the coordination control signal (C1) of the welding current sampling (B1), voltage sample (B2) and another welding machine that derive from main circuit part (8), the inverter circuit (8.3) and the wire-feed motor of its output control main circuit; Specifically, it mainly may further comprise the steps successively:
1) at first according to actual requirement, determines welding parameter: comprise wire feed rate V, crest voltage Up, time to peak Tp, frequency F, background current Ib, phase relation DLY; Its function realizes by input and display part (D) of front panel;
2) when welding is carried out, frequency F and the time to peak Tp timer numerical value of determining stage pulse and base value stage correspondence according to input, and the startup software timer interrupts controlling automatically conversion, make it in the pulse base value stage, the given signal of output and the feedback signal of taking are given signal of electric current and current feedback signal, promptly guarantee the constant of electric current; In the peak value of pulse stage, the given signal of output and the feedback signal of taking are voltage given signal and voltage feedback signal, make welding machine at different different control signal and the given signals of welding stage output, constitute different closed-loop controls thus, thereby guarantee to realize stable welding under the constant condition of every welding machine frequency, this realizes by control circuit part (9); Given (A2) and switching signal (A3) are according to parameter preset, and voltage and current control is finished in conversion simultaneously between base value and peak value;
3) in welding process, main welding machine is when being converted to peak value by base value, will be by serial communication circuit (C1) to send a serial communication signals from welding machine, from welding machine by serial communication circuit (C1) itself after receiving this signal, be set and be the base value stage, and, determine this base value time according to given phase relation DLY value, finish any designated phase difference control; This step interrupts realizing by serial communication;
4) in process 3) in, if receive the interrupt signal that main welding machine sends, then will weld according to own original default parameter, till the serial communication signals of receiving main welding machine from welding machine because factors such as interference fail to make from welding machine.
2, the source of welding current that designs according to method of the present invention, mainly comprise main circuit part (8) and be the control circuit part (9) of control centre that it is characterized in that: described control circuit part (9) adopts commutation circuit (B) and SCM system to link to each other with the power supply of another welding machine by serial communication circuit (C1) with the single-chip microcomputer; Described commutation circuit (B) mainly comprises current acquisition circuit (B1) and the voltage collection circuit (B2) that input partly links to each other with main circuit respectively, and the change-over switch (B3), comparing element (B4), integration proportional controller (B5), pulse-width modulation circuit (B6), the IGBT drive circuit (B8) that connect in turn; Wherein change-over switch (B3) comprises two inputs, output and a control end: two inputs link to each other with electric current, voltage collection circuit (B1), (B2) respectively, control end links to each other with the switching signal (A3) of SCM system output, switch by controlling from the switching signal (A3) of single-chip microcomputer regularly, make it switch to collection voltage at the weld pulse peak phase, switch to the collection electric current in the weld pulse base value stage, output disconnecting comparing element (B4); Another input of comparing element (B4) links to each other with the given signal (A2) of SCM system output, its function is for being used for finishing from the feedback current of (B1) with from the feedback voltage of (B2) and comparison from the value of given (A2), and its difference is input to the integration ratio and regulates (B5); Another of pulse-width modulation circuit (B6) is input as holding circuit (B7), and IGBT drive circuit (B8) is output as inverter circuit (8.3).
3, control power supply according to claim 2, it is characterized in that: control circuit part (9) mainly comprises core control section (A), control operating part (B), peripheral unit control and operating part (C), the input of front panel and keyboard/display part (D); Described core control section (A) is made up of SCM system (A1), and the importation comprises current sample (B1) and the voltage sample (B2) that is input to A/D conversion (A4) and is input to the voltage sample (B2) of judging (A5) in short circuit; Wherein A/D conversion (A4) is used for passing through the processing of 80C196KC SCM system and display part (D) when welding, shows actual welding electric current and magnitude of voltage in real time; Short circuit is judged when signal (A5) guarantees that short-circuit conditions takes place in welding process, SCM system energy acquired information; Described peripheral unit control and operating part (C) comprise that carrying out core control section (A) is input to the arc welding gun switch (C3) of SCM system (A1), wire feed given (C4) and the air valve (C5) that input links to each other with SCM system (A1) by photoelectricity isolated part (C2), the wire-feed motor alignment circuit (C6) that input given with wire feed (C4), output link to each other with outside wire-feed motor with serial communication (C1), photoelectricity isolated part (C2), the output that another welding machine carries out two-way communication by photoelectricity isolated part (C2); The input of described front panel and display part (D) comprise that welding parameter that keyboard display driver circuit (D1) that input links to each other with SCM system (A1), the welding parameter that input links to each other with keyboard display driver circuit (D1) show that (D3), output link to each other with SCM system (A1) by keyboard display driver circuit (D1) presets the coding knob given (D2) that (D4), output link to each other with SCM system.
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Assignee: Wuxi Zhouxiang Complete Set of Welding Equipment Co., Ltd. Assignor: Beijing University of Technology Contract fulfillment period: 2007.12.25 to 2012.12.25 contract change Contract record no.: 2008320001091 Denomination of invention: Welding control method of diplonema MAG and welding source Granted publication date: 20071212 License type: Exclusive license Record date: 2008.11.5 Assignee: Hangzhou Kell electric welding Co., Ltd. Assignor: Beijing University of Technology Contract fulfillment period: 2008.10.16 to 2013.10.15 contract change Contract record no.: 2008330001424 Denomination of invention: Welding control method of diplonema MAG and welding source Granted publication date: 20071212 License type: Exclusive license Record date: 20081028 |
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