CN102615384A - Power supply device for welding and welding machine - Google Patents
Power supply device for welding and welding machine Download PDFInfo
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- CN102615384A CN102615384A CN2012100147666A CN201210014766A CN102615384A CN 102615384 A CN102615384 A CN 102615384A CN 2012100147666 A CN2012100147666 A CN 2012100147666A CN 201210014766 A CN201210014766 A CN 201210014766A CN 102615384 A CN102615384 A CN 102615384A
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Abstract
The invention provides a power supply apparatus for welding and a welding machine. When the electrode is set in the short circuit state to measure the calculated resistor value and the inductance value of the voltage applied to the front end of the electrode, the measurement under the short circuit and other abnormal conditions can be prevented. In the measuring mode of determining total resistance value R and total inductance value L to the front end of the electrode (12) related to the calculation of front end voltage, in the actual measurement of each measured value, determining whether the detected output voltage Vm is the abnormal value resulting from short circuit or other abnormal conditions or not. When it is determined to be abnormal, an abnormal reporting apparatus records abnormality. To be specific, the operator, based on the reported abnormality, can identify the abnormality and prevent the measurement from continuing when short circuit abnormality occurs.
Description
Technical field
The welding that the present invention relates to implement FEEDBACK CONTROL according to the calculating of terminal voltage before the electrode is with supply unit and possess the bonding machine of this welding with supply unit.
Background technology
Arc welding with supply unit for example shown in patent documentation 1; Be constituted as: through inverter circuit; To carry out the direct current after the rectification to interchange input electric power and be transformed to high-frequency alternating current from source power supply; Through rectification circuit and direct current reactor, will carry out the adjusted high-frequency alternating current of voltage by welding transformer and be transformed to the direct current output power that is suitable for arc welding.The output power that is generated by supply unit is fed into the electrode that is supported by welding torch, between electrode front end and welding object, produces electric arc thus, carries out the welding of welding object.
In addition; The detection of output current and output voltage is carried out in this welding with supply unit; Control device will be constantly detected output current and output voltage feed back to the PWM control of inverter circuit, and implement to make constantly output power to become the control of appropriate value, improve welding performance.
Patent documentation 1:JP spy opens flat 8-103868 communique
Yet; In order to produce suitable electric arc; The preferred output voltage that not only will in supply unit, detect is reflected to the controlling value of inverter circuit, also calculates the preceding terminal voltage of the electrode that correctly produces this electric arc, and terminal voltage before the electrode that calculates is reflected to controlling value.
Because the situation of separating between the welding torch that in fact welds (electrode) and the supply unit is more, the form that connects via power cable (power cable) between the two is general use form.Therefore, the cable length of power cable is different because of each user, so the resistance value of cable itself is different; And according to any intermediate position of cable; For example lay in several weeks as if unnecessary length is reeled, then according to the situation of laying point-blank or the difference of winding number, inductance value is also different.Therefore, for the resistance between the outside electrode of the supply unit of realizing the further raising of welding performance, can not ignore comprising power cable and the variation in voltage amount of inductance.
Therefore; Be reflected in the mode of controlling value of inverter circuit at the output voltage that will in supply unit, detect; Can produce following worry: the magnitude of voltage that deviates from terminal voltage before the real electrode is reflected to the controlling value of inverter circuit; This can hinder and produce suitable electric arc, hinders the further raising of welding performance.
The mensuration of the employed resistance value of calculating of terminal voltage and inductance value is to carry out under the state of terminal shortcircuit before making electrode before such electrode; But under the situation of short circuit unusual (poor short circuit); It is big that the evaluated error of resistance value or inductance value becomes, and uses these and the precision of the value of the preceding terminal voltage calculated is very low.In addition,, then all of a sudden produce electric arc at the electrode front end sometimes, so under near the situation the operator is positioned at electrode, bring uneasy sense can for this operator if likewise the preceding terminal shortcircuit of electrode is unusual.
Summary of the invention
The present invention makes in order to solve above-mentioned problem; Its purpose be to provide a kind of under the electric pole short circuit state to electrode before the employed resistance value of calculating and the inductance value of terminal voltage when measuring, can prevent in the welding that has produced the mensuration of carrying out under the unusual state of short circuit with supply unit and possess the bonding machine of this welding with supply unit.
In order to solve above-mentioned problem; Invention described in the technical scheme 1 is that supply unit is used in a kind of welding; It possess with direct current be transformed to high-frequency alternating current inverter circuit, carry out the alternating current after the conversion the voltage adjustment welding transformer and generate the DC converting mechanism of the direct current output power that is suitable for welding according to the secondary side alternating current of this welding transformer; It also possesses controlling organization; This controlling organization be based on the said output power that generated to the supply of electrode and welding object between be used in the mechanism that the electric arc of welding produces; And based on the preceding terminal voltage of calculating said electrode by detected output current of testing agency in this device and output voltage; Preceding terminal voltage based on calculating is controlled said inverter circuit; Wherein, Said welding has the mode determination of carrying out the processing that comprises resistance value calculation mechanism and inductance value calculation mechanism with supply unit, and possesses front end voltage calculation mechanism, and said resistance value calculation mechanism is made as short-circuit condition with said electrode and handles; The magnitude of voltage of the said output voltage when being made as the rated current value based on the said output current that will produce by the action of said inverter circuit; Calculate the total resistance value on the path till the said electrode front end, said inductance value calculation mechanism is made as short-circuit condition with said electrode and handles, the current attenuation amount that begins when being set at the rated current value based on the said output current that will be produced by the action of said inverter circuit; Calculate the total inductance value on the path till the said electrode front end; Said front end voltage calculation mechanism is to by said total resistance value and the relevant voltage variety of said total inductance value on the magnitude of voltage correction of the detected said output voltage of said testing agency and the path till said electrode front end, calculate said before terminal voltage, said welding also possesses with supply unit: the unusual decision mechanism of short circuit; Whether it judges in the practical measurement under said mode determination, is the unusual caused exceptional value of main cause of short circuit that comprises said electrode by the detected said output voltage of said testing agency; With exception reporting mechanism, it reports this situation when unusual being judged as by the unusual decision mechanism of said short circuit.
In this invention; Measure with electrode before under the mode determination of the relevant total resistance value till the electrode front end of the calculating of terminal voltage and total inductance value; In the practical measurement of each measured value, judge by the unusual decision mechanism of short circuit whether detected output voltage is the unusual caused exceptional value of main cause of short circuit that comprises electrode.Be judged as by the unusual decision mechanism of short circuit when unusual, unusual by the report of exception reporting mechanism.Thus, the short-circuit condition of the electrode that when practical measurement, requires is under the unusual situation, should be unusual through report, thus can discern by the operator, so prevent to continue practical measurement having produced under the unusual situation of short circuit.As a result, the operator can carry out practical measurement again, can help to obtain the high preceding terminal voltage of precision.In addition, the generation of the unexpected electric arc that can suppress to cause unusually because of short circuit helps the improvement of operating environment.
Invention described in the technical scheme 2 be the welding described in the technical scheme 1 with supply unit in; Possess and measure preceding decision mechanism; This is measured before the preceding practical measurement of decision mechanism in said mode determination; Enforcement is used to confirm the applying of assigned voltage of the short-circuit condition of said electrode; Judge based on this voltage application whether said output voltage is the unusual caused exceptional value of main cause of short circuit that comprises said electrode, said exception reporting mechanism decision mechanism before by said mensuration is judged as and reports this situation when unusual.
In this invention; Before the practical measurement in mode determination; Implement to be used to confirm the applying of assigned voltage of the short-circuit condition of electrode by decision mechanism before measuring, judge based on this voltage application whether output voltage is the unusual caused exceptional value of main cause of short circuit that comprises electrode.Be judged as by decision mechanism before measuring when unusual, unusually by the report of exception reporting mechanism.Thus, before practical measurement, the short-circuit condition of the electrode that when practical measurement, requires is under the unusual situation, should be unusual through report, thus can discern by the operator, so avoided also carrying out practical measurement having produced under the unusual situation of short circuit.
Invention described in the technical scheme 3 be the welding described in the technical scheme 2 with supply unit in, the little magnitude of voltage of voltage that the voltage that when judging before the mensuration that decision mechanism carries out before by said mensuration said electrode is applied applies in being set to than practical measurement.
In this invention; Because the voltage that applies that when before mensuration, judging electrode is applied is set to than applying the little magnitude of voltage of voltage in the practical measurement; So the generation of the unexpected electric arc that can prevent reliably to cause unusually because of short circuit can help the further improvement of operating environment.
Invention described in the technical scheme 4 is to possess the bonding machine that each described welding of technical scheme 1～3 constitutes with supply unit.In this invention, a kind of bonding machine of also having measured resistance value and inductance value under the unusual situation of short circuit having produced of preventing can be provided.
The invention effect
According to the present invention; Can provide a kind of electrode is made as short-circuit condition measure electrode before during the employed resistance value of calculating and the inductance value of terminal voltage, can prevent producing the welding also measured under the unusual situation of short circuit with supply unit and possess the bonding machine of this welding with supply unit.
Description of drawings
Fig. 1 is the pie graph of supply unit of the arc welding machine of this embodiment of expression.
Fig. 2 is used for the key diagram that the variation to inductance value describes.
Fig. 3 is used for the key diagram that the computational methods to resistance value and inductance value describe.
Fig. 4 is the employed sequential chart when describing of the judgement to short-circuit condition.
Symbol description:
10 arc welding machines (bonding machine)
Supply unit is used in 11 welding
12 wire-electrode (electrode)
22 inverter circuits
23 welding transformers
24 rectification circuits (DC converting mechanism)
25 direct current reactors (DC converting mechanism)
31 control device (decision mechanism, exception reporting mechanism before controlling organization, front end voltage calculation mechanism, resistance value calculation mechanism, inductance value calculation mechanism, the unusual decision mechanism of short circuit, the mensuration)
33 current sensors (testing agency)
34 voltage sensors (testing agency)
36 exception reporting devices (exception reporting mechanism)
The M welding object
The I output current
The Ip1 current value
The Ip2 current value
The V output voltage
Vs output voltage (actual output)
Vm output voltage (detection)
Terminal voltage before the Va
R adds up to resistance value
L adds up to inductance value
L (I) function
The specific embodiment
Below, according to accompanying drawing the embodiment after the present invention is specialized is described.
Fig. 1 representes the arc welding machine 10 of consumable electrode type.In arc welding machine 10; Positive side lead-out terminal welding with supply unit 11 connects the wire-electrode 12 that is supported by welding torch TH; Minus side lead-out terminal at this supply unit 11 connects welding object M; Through the power supply of the direct current output power that generates by this supply unit 11, carry out arc welding to wire-electrode 12.At this moment, because wire-electrode 12 time is consumed in welding, so welding wire generator 13 is given corresponding to consumption.To wire-electrode 12 and welding object M, supply with output power via the power cable 14 that the lead-out terminal with supply unit 11 is connected.
It is that interchange input power converter with the three-phase that provides from source power supply is the device that is suitable for the direct current output power of arc welding that supply unit 11 is used in welding.Exchange input electric power and be transformed to direct current through the rectifier smoothing circuit 21 that is made up of diode bridge and smmothing capacitor, the direct current after the conversion is transformed to high-frequency alternating current through inverter circuit 22.Inverter circuit 22 is made up of the bridgt circuit that has used 4 switch element TR such as IGBT, implements the PWM control based on control device 31.
The high-frequency alternating current that is generated by inverter circuit 22 is transformed to the secondary side alternating current that is adjusted into the assigned voltage value by welding transformer 23.The rectification circuit 24 and direct current reactor 25 of the secondary side alternating current of welding transformer 23 through having used diode is transformed to the direct current output power that is suitable for arc welding.
The direct current reactor 25 of this embodiment uses the supersaturation reactor with supersaturation characteristic.The characteristic of direct current reactor 25 is as shown in Figure 2, and the big high galvanic areas of ratio rated current value Ia that comprises current value I p1 is the common characteristic zone A1 fixing with the MIN inductance value La of necessity.On the other hand, becoming low current zone below the rated current value Ia is the supersaturation characteristic zone A2 (current value I p2, inductance value Lb) that the minimizing inductance value along with current value increases linearly gradually.Promptly; Through the direct current reactor 25 that adopts such characteristic; Thereby it is little in high galvanic areas inductance value; So the influence to being used for the level and smooth Waveform Control of electric current is little, prevented arc cutting thereby increase inductance value in the low current zone passage, generated at all suitable direct current output power of whole galvanic areas.
As shown in Figure 1, the switch element TR of 31 pairs of inverter circuits 22 of control device implements PWM control, makes the direct current output power be the control of appropriate value often.At this moment, control device 31 carries out output current I and the detection of output voltage V constantly, carries out the feedback to PWM control based on detected output current I and output voltage V.
That is, possess current sensor 33 on the power line of the minus side lead-out terminal in supply unit 11, control device 31 detects the output current I of supply units 11 via this current sensor 33 in handling part (CPU) 32.In addition, possess voltage sensor 34 between the power line after adjacent rectification circuit 24, control device 31 detects the output voltage V of supply units 11 via this voltage sensor 34 in handling part 32.Control device 31 carries out the calculating of the dutycycle (duty) of PWM control based on by detected constantly output current I of handling part 32 and output voltage V, generates the pwm control signal to inverter circuit 22 outputs.
At this, in PWM control, as the output voltage V that is used to control, preferred employing correctly produces the preceding terminal voltage Va of the wire-electrode 12 of electric arc, but the direct detection of preceding terminal voltage Va is difficult.For this reason; Control device 31 will remain on the storage device (diagram slightly) by the voltage variety 12 from voltage sensor 34 to electrode in advance; Detected output voltage V is constantly carried out the correction of this voltage variety; With terminal voltage Va before obtaining, and implement to have adopted the PWM of the preceding terminal voltage Va that is calculated to control.
Yet; The voltage variety 12, there is the voltage variety (from lead-out terminal via the voltage variety that by resistance value R2 and inductance value L2 cause of power cable 14 till electrode 12 front ends) of inner voltage variety of supply unit 11 (till by resistance value R1 and the caused voltage variety of inductance value L1) and outside from rectification circuit 24 to lead-out terminal from voltage sensor 34 to electrode.In order not receive the influence of user mode; The calculating of terminal voltage Va before can the builtin voltage variable quantity of supply unit 11 being enrolled as correction term in advance; But the external voltage variable quantity is because the cable of power cable 14 is long or any intermediate position (straight-run or coiling lay, its winding number) waits, condition is because of each user's difference, so largely receive resistance value R2, the particularly influence of the variation of inductance value L2.
For this reason; The user is provided with arc welding machine 10 at the scene; Also comprise when becoming correct user mode in being laid in of power cable 14, measure the resistance value R and the inductance value L that obtain after the resistance value R1 of inside and inductance value L1 and outside resistance value R2 and inductance value L2 added up to.Total resistance value R that mensuration obtains and total inductance value L are maintained in the control device 31.
In addition; In the supply unit 11 of this embodiment, has mode determination; This mode determination is carried out and is used to the processing carrying out above-mentioned total resistance value R and add up to the mensuration of inductance value L; According to the operation of the console switch that is equipped with in the supply unit 11 (diagram slightly), control device 31 can move to mode determination.In addition, also can constitute: the remote controller (all not shown) that is equipped with in the welding torch switch that is equipped with among the use welding torch TH, the welding wire generator 13 moves to mode determination from the position of leaving supply unit 11.In addition; When the mensuration of mode determination; Need wire-electrode 12 be made as the state with welding object M short circuit; But as shown in Figure 1 in this embodiment, not with wire-electrode 12 and welding object M direct short-circuit, but make the leading section that is provided in welding torch TH and measure to contact chip THa and welding object M short circuit that wire-electrode 12 is supplied power.In this case, also can make the special fixtures that short circuit uses uses.
If mode determination is described in detail, as shown in Figure 3, at first, make inverter circuit 22 work, output current I increases to current value I p1.This current value I p1 is in the monomer of the direct current reactor with supersaturation characteristic 25, with the current value of the fixing common characteristic zone A1 of inductance value La.In fact, as shown in Figure 2, owing to characteristic squints because of any intermediate position of power cable 14 etc.,, be set to the current value of the common characteristic zone A1 that has considered this side-play amount so add up to inductance value L to fix with the value La1 of skew.And, measure the average voltage level Ve in the interval that keeps with such current value I p1.Thus, at first calculate total resistance value R through following formula (a).
R＝Ve/Ip1···(a)
Then, the action of inverter circuit 22 is stopped, picking up counting from moment T0 at this moment.Simultaneously; Carry out with moment T0 is the sampling of the output current I that changes constantly of starting point; The moment that will reach conduct and the current value Δ Ip1 (Ip1 * 36.8%) of the corresponding current attenuation amount of time constant is made as T1, tries to achieve time (time constant) τ 1 between this moment T1-T0.Thus, calculate through following formula (b) at the total inductance value La1 of characteristic zone A1 variation usually (being inductance value La in the monomer of reactor 25).
La1＝R·τ1(＝Ve·τ1/Ip1)···(b)
Then, make inverter circuit 22 actions once more, output current I is adjusted to the rated current value Ip2 in the A2 of supersaturation characteristic zone.After adjustment, the action of inverter circuit 22 is stopped, picking up counting from moment T2 at this moment.Simultaneously; Carry out with moment T2 is the sampling of the output current I that changes constantly of starting point; The moment that will reach conduct and the current value Δ Ip2 (Ip2 * 36.8%) of the corresponding current attenuation amount of time constant is made as T3, tries to achieve time (time constant) τ 2 between this moment T3-T2.Thus, the total inductance value Lb1 that A2 changes in supersaturation characteristic zone (in the monomer of reactor 25, being inductance value Lb) is calculated by following formula (c).
Lb1＝R·τ2＝(Ve·τ2/Ip2)···(c)
Then, as shown in Figure 2, the total inductance value La1 of the common characteristic zone A1 that calculates and the total inductance value Lb1 of supersaturation characteristic zone A2 augment through straight line, obtain adding up to the function L (I) of inductance value L as electric current I.Then, the function L (I) of the total inductance value L that obtains like this and the total resistance value R that had before obtained are remained in the control device 31.Thus, mode determination finishes.
Then, control device 31 is in when action welding, terminal voltage Va before being calculated by following formula (d) according to constantly output current I and output voltage V.
Va＝V-L(I)·dI/dt-RI···(d)
In addition, if with concrete numeric representation, with current value I p1=400 [A] output 10 [ms] clock of output current I, afterwards, make inverter circuit 22 disconnections according to the connection of inverter circuit 22.When average voltage level Ve during this period is 4 [V],, calculate total resistance value R, R=Ve/Ip1=4/400=0.01 [Ω] according to above-mentioned formula (a).
Then; The current value Δ Ip1 that current value I p1 becomes the current attenuation amount suitable with timeconstant 1 is Δ Ip1=400 * 0.368=147 [A]; Output current I is 3 [ms] from the timeconstant 1 that 400 [A] reach 147 [A] if make inverter circuit 22 break off afterwards, then according to above-mentioned formula (b)
La1＝R·τ1＝0.01×3＝0.03[mH]
In common characteristic zone A1, calculate the total inductance value La1 of the inductance value La of the monomer that comprises direct current reactor 25.In addition, above-mentioned current value I p1 needs to infer according to the specification of the direct current reactor 25 that uses in advance, and is set at the value that does not reach supersaturation characteristic zone A2.
Then, inverter circuit 22 is connected, output current I is made as for example suitable with the minimum current of the arc welding machine 10 current value I p2=20 [A] in the A2 of supersaturation characteristic zone, output 10 [ms] clock afterwards, turn-offs inverter circuit 22.The current value Δ Ip2 that current value I p2 becomes the current attenuation amount suitable with timeconstant 2 does
ΔIp2＝20×0.368＝7[A]
If output current I is 10 [ms] from the timeconstant 2 that 20 [A] reach 7 [A] after the disconnection inverter circuit 22, then according to above-mentioned formula (c),
Lb1＝R·τ2＝0.01×10＝0.1[mH]
In the A2 of supersaturation characteristic zone, calculate the total inductance value Lb1 of the inductance value Lb of the monomer that comprises direct current reactor 25.
Then, augment, thereby obtain adding up to the function L (I) of inductance value L, and, can calculate preceding terminal voltage Va constantly according to above-mentioned formula (d) according to this function and the total resistance value R that had before obtained through the straight line that carries out these La1=0.03 [mH], Lb1=0.1 [mH].In addition, the above-mentioned concrete numerical value of enumerating is an example, is not to be defined in this.
Even also can suitably calculate preceding terminal voltage Va in the welding of this embodiment that adopts direct current reactor 25 like this in supply unit 11, can carry out the control constantly of inverter circuit 22 more rightly based on the preceding terminal voltage Va that suitably calculates thus with supersaturation characteristic.Therefore, through with the complementary effect of the reactor 25 that adopts the supersaturation characteristic, can be created on all direct current output powers of using of arc welding more suitably of whole galvanic areas.
Yet, before the above-mentioned practical measurement of mode determination, carry out the judgement (judging before measuring) whether electrode 12 (contact chip THa) becomes sufficient short-circuit condition.Specifically, as shown in Figure 4, before the practical measurement of carrying out, electrode 12 (contact chip THa) is applied the for example voltage about 15 [V] implementing to make output current I increase to current value I p1.In addition, below the output voltage V of above-mentioned use is divided into actual outlet side and detection side, the output voltage of actual outlet side is made as " Vs ", the output voltage of detection side is made as " Vm ".
The output voltage V s of 15 [V] when judging before measuring applies, and is under the normal situation in the short-circuit condition of electrode 12 (contact chip THa), is near the small magnitude of voltage 0 [V] by the handling part 32 detected output voltage V m of control device 31.Therefore, detected output voltage V m is lower than and is used for the unusual threshold value of judging of short circuit, handling part 32 be judged as be in can practical measurement short-circuit condition.On the other hand, producing under the unusual situation of short circuit, the magnitude of voltage of detected output voltage V m uprises.Be used for the unusual threshold value of judging of short circuit if be higher than, then to be judged as be the short circuit abnormality that can not suitably carry out ensuing practical measurement to handling part 32.So handling part 32 makes 36 work of exception reporting device report unusually to the operator.
The pronounce device etc. of report such as in addition, exception reporting device 36 is reported by having used at the display of outfits such as supply unit 11 or welding torch TH, welding wire generator 13, the work sound through buzzer or relay constitutes.In addition, on one side under the situation that discharges on one side the arc welding machine 10 that inert gas welds, also can carry out previous exception reporting by the unlocking noise of gas from the leading section of welding torch TH.Then, the operator receives this exception reporting, carries out the reliable short circuit of electrode 12 (contact chip THa), implements to measure according to judging before measuring once again.
Then, because it is also conceivable that when implementing practical measurement, the short-circuit condition of electrode 12 (contact chip THa) takes place unusual, so the handling part 32 of control device 31 carries out the detection of the abnormal voltage of detected output voltage V m.If detect the abnormal voltage that generation is caused by short circuit unusually, then handling part 32 likewise makes 36 work of exception reporting device report unusually to the operator with above-mentioned.The operator likewise receives this exception reporting, carries out the reliable short circuit of electrode 12 (contact chip THa), implements to measure according to judging before measuring once again.
And then even it is also conceivable that owing to normal termination is measured in the short circuit that does not produce electrode 12 (contact chip THa) unusually, the total resistance value R that is obtained also possibly become exceptional value with adding up to inductance value L.For example, the power cable that between supply unit 11 and welding torch TH, lays 14 adopts inappropriate cables such as sectional areas, cable are long, even or the unusual situation of suitable product but reeling condition inferior, measured value can become exceptional value.Given this; In the storage device 35 that in the control device 31 of this embodiment, is equipped with, will be suitable for that sectional area and the cable of cable 14 of this supply unit 11 is long etc., line data storehouse (DB) change of going forward side by side of being associated with the proper range of its resistance value zero [Ω] and inductance value △ [μ H] keeps.
Then, handling part 32 is according to the resistance value of the cable 14 of current use and the proper range of inductance value, the total resistance value R that judges practical measurement with add up to inductance value L whether in this proper range.Under the situation in proper range, add up to resistance value R and the renewal that adds up to inductance value L, promptly carry out the total resistance value R and the Data Update that adds up to inductance value L of current maintenance, be used for later control as control device 31.On the other hand; The total resistance value R that is judged as mensuration with add up to inductance value L outside proper range under the situation of (exceptional value); Do not carry out the total resistance value R and the Data Update that adds up to inductance value L of current maintenance as control device 31, implement exception reporting by exception reporting device 36.The operator receives this exception reporting, can measure the affirmation of state, carries out affirmation and the affirmation of its any intermediate position etc. of the power cable 14 of current use itself.
Next, the distinctive effect of notebook embodiment.
(1) under the mode determination of total resistance value R till the front end of measuring the electrode 12 relevant and total inductance value L (being function L (I) in this embodiment) with the calculating of preceding terminal voltage Va; In the practical measurement of each measured value, judge that whether detected output voltage V (Vm) is to comprise the exceptional value that the unusual main cause of short circuit of electrode 12 causes.Being judged as when unusual, carry out unusual report by exception reporting device 36.Thus, the short-circuit condition of the electrode 12 that when practical measurement, requires is under the unusual situation, should be unusual through report, thus the operator can discern, so can prevent also to continue practical measurement having produced under the unusual situation of short circuit.As a result, can carry out practical measurement again, help to obtain the high preceding terminal voltage Va of precision through the operator.In addition, the generation of the unexpected electric arc that short circuit causes unusually can be suppressed, operator's operating environment can be helped to improve.
(2) before the practical measurement in mode determination; Enforcement is used to confirm the applying of assigned voltage (about 15 [V]) of the short-circuit condition of electrode 12; Based on this voltage application, judge that whether output voltage V (Vm) is to comprise the exceptional value that the unusual main cause of short circuit of electrode 12 causes.Being judged as when unusual, carry out unusual report by exception reporting device 36.Thus, before practical measurement, the short-circuit condition of the electrode 12 that when practical measurement, requires is under the unusual situation, should be unusual through report, thus the operator can discern, so can avoid also carrying out practical measurement having produced under the unusual situation of short circuit.
The voltage that applies that when (3) before mensuration, judging electrode 12 is applied for example is 15 [V] in this embodiment, is set to than applying fully little magnitude of voltage of voltage in the practical measurement.Therefore, the generation of the unexpected electric arc that can prevent reliably to cause unusually because of short circuit helps the further improvement of operating environment.
In addition, embodiment of the present invention also can change as following.
In the above-described embodiment, will the voltage that applies that electrode 12 applies be made as about 15 [V] when before mensuration, judging, but magnitude of voltage can suitably change nothing but an example.In this case, be preferably set to than applying fully little magnitude of voltage of voltage in the practical measurement.
In the above-described embodiment, according in the practical measurement with measure before resistance value R, each measured value of inductance value L judge that the short circuit of electrode 12 is unusual, but also can in practical measurement, implement at least, and omit before measuring.
The exception reporting device 36 of narration is nothing but an example, so can suitably change in the above-described embodiment.
In the above-described embodiment, stored the database (DB) relevant, and carried out the comparison with each measured value, but also can this have been omitted with various cable 14 at storage device 35.
Used direct current reactor 25 in the above-described embodiment, but also can use general reactor with current value and the fixing linear characteristic that changes of inductance value with supersaturation characteristic.In addition, if use such reactor, the mensuration through the primary current attenuation just can obtain inductance value (need not obtain function), and is easy thereby the calculating of preceding terminal voltage Va becomes.
Claims (4)
1. welding supply unit; It possess with direct current be transformed to high-frequency alternating current inverter circuit, carry out the alternating current after the conversion the voltage adjustment welding transformer and generate the DC converting mechanism of the direct current output power that is suitable for welding according to the secondary side alternating current of this welding transformer; It also possesses controlling organization; This controlling organization be based on the said output power that generated to the supply of electrode and welding object between be used in the mechanism that the electric arc of welding produces; And based on the preceding terminal voltage of calculating said electrode by detected output current of testing agency in this device and output voltage; Preceding terminal voltage based on calculating is controlled said inverter circuit
Wherein, Said welding has the mode determination of carrying out the processing that comprises resistance value calculation mechanism and inductance value calculation mechanism with supply unit; And possesses front end voltage calculation mechanism; Said resistance value calculation mechanism is made as short-circuit condition with said electrode and handles; The magnitude of voltage of the said output voltage when being made as the rated current value based on the said output current that will produce by the action of said inverter circuit; Calculate the total resistance value on the path till the said electrode front end, said inductance value calculation mechanism is made as short-circuit condition with said electrode and handles, the current attenuation amount that begins when being set at the rated current value based on the said output current that will be produced by the action of said inverter circuit; Calculate the total inductance value on the path till the said electrode front end; Said front end voltage calculation mechanism is to by said total resistance value and the relevant voltage variety of said total inductance value on the magnitude of voltage correction of the detected said output voltage of said testing agency and the path till said electrode front end, calculate said before terminal voltage
Said welding also possesses with supply unit:
The unusual decision mechanism of short circuit, whether it judges in the practical measurement under said mode determination, is the unusual caused exceptional value of main cause of short circuit that comprises said electrode by the detected said output voltage of said testing agency; With
Exception reporting mechanism, it reports this situation when unusual being judged as by the unusual decision mechanism of said short circuit.
2. supply unit is used in welding according to claim 1, it is characterized in that,
Possess and measure preceding decision mechanism; This is measured before the preceding practical measurement of decision mechanism in said mode determination; Enforcement is used to confirm the applying of assigned voltage of the short-circuit condition of said electrode; Judge based on this voltage application whether said output voltage is the unusual caused exceptional value of main cause of short circuit that comprises said electrode
Said exception reporting mechanism decision mechanism before by said mensuration is judged as and reports this situation when unusual.
3. supply unit is used in welding according to claim 2, it is characterized in that,
The little magnitude of voltage of voltage that the voltage that when judging before the mensuration that decision mechanism carries out before by said mensuration said electrode is applied applies in being set to than practical measurement.
4. a bonding machine is characterized in that, each the described welding that possesses claim 1～3 constitutes with supply unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| JP2011-015508 | 2011-01-27 | ||
| JP2011015508A JP5618850B2 (en) | 2011-01-27 | 2011-01-27 | Welding power supply and welding machine |
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| CN102615384A true CN102615384A (en) | 2012-08-01 |
| CN102615384B CN102615384B (en) | 2015-05-27 |
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| CN201210014766.6A Active CN102615384B (en) | 2011-01-27 | 2012-01-17 | Power supply device for welding and welding machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286420A (en) * | 2013-05-30 | 2013-09-11 | 唐山松下产业机器有限公司 | Electric arc welder and electric arc welding short-circuit determining method |
| CN111630764A (en) * | 2018-01-23 | 2020-09-04 | 松下知识产权经营株式会社 | Power supply device and welding power supply device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5868712B2 (en) * | 2012-01-20 | 2016-02-24 | 株式会社ダイヘン | Power supply for welding |
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| JPH08103868A (en) * | 1994-09-30 | 1996-04-23 | Daihen Corp | Power source device for welding |
| CN1150076A (en) * | 1995-08-02 | 1997-05-21 | 宫地技术株式会社 | Apparatus for controlling inverter resistance welding |
| CN1244450A (en) * | 1998-07-08 | 2000-02-16 | 株式会社三社电机制作所 | Power device for arc using apparatus |
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| US20100224606A1 (en) * | 2009-03-03 | 2010-09-09 | Illinois Tool Works Inc. | Short circuit detection systems and methods |
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| CN103286420A (en) * | 2013-05-30 | 2013-09-11 | 唐山松下产业机器有限公司 | Electric arc welder and electric arc welding short-circuit determining method |
| CN103286420B (en) * | 2013-05-30 | 2015-06-03 | 唐山松下产业机器有限公司 | Electric arc welder and electric arc welding short-circuit determining method |
| CN111630764A (en) * | 2018-01-23 | 2020-09-04 | 松下知识产权经营株式会社 | Power supply device and welding power supply device |
| CN111630764B (en) * | 2018-01-23 | 2023-08-08 | 松下知识产权经营株式会社 | Power supply device and welding power supply device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5618850B2 (en) | 2014-11-05 |
| CN102615384B (en) | 2015-05-27 |
| JP2012157198A (en) | 2012-08-16 |
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