JP2014128810A - Arc welding apparatus, and feeder for use in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a welding state from becoming unstable due to variations in characteristics of a feed motor FM of a feeder FH, in a consumable electrode arc welding apparatus.SOLUTION: An arc welding apparatus includes: a welding power source PS that outputs a welding voltage Vw set by a voltage set signal Vr and a driving voltage Em set by a feed speed set signal Fr; and a feeder FH provided with a feed motor FM in which a rotational speed is controlled by this driving voltage Em. The feeder FH includes: a memory part MC storing characteristic data Mc associated with the feed motor FM, and the welding power source PS reads the characteristic data Mc from the memory part MC, and performs output control based on this characteristic data Mc which is read. Consequently, an output control optimal to the characteristics of the feeder FH connected to the welding power source PS can be made, even if the type of the feeder FH is different or the same type, when variations are present in the characteristics.

Description

  The present invention relates to a welding power source that outputs a welding voltage set by a voltage setting signal and a driving voltage set by a feeding speed setting signal, a feeding motor whose rotational speed is controlled by the driving voltage, and the feeding motor. The present invention relates to an arc welding apparatus provided with a storage unit that stores a storage unit storing characteristic data about the same, and a feeder used therefor.

  The consumable electrode type arc welding apparatus includes a welding power source, a feeder, a welding torch, and the like. The welding power source is a power source having a constant voltage characteristic, and outputs a welding voltage set by a predetermined voltage setting signal and outputs a driving voltage set by a predetermined feeding speed setting signal to the feeding motor. The feeder is connected to a welding power source and includes a feeding motor for feeding the welding wire. The rotational speed of the feeding motor is controlled by the driving voltage. That is, the feeding speed is controlled by the value of the driving voltage. A DC motor is often used as the feed motor. The welding torch is connected to a feeder to supply a welding voltage output from a welding power source to the welding wire, and an arc is generated between the welding wire and the base material.

  A feeder is selected from a plurality of types of feeders according to the application and connected to a welding power source. The maximum value of the feeding speed differs depending on the feeder. A high-speed type feeder is used for welding in a large current range, and a low-speed type feeder is used for welding in a small current range. Is done. Since the high-speed type feeder and the low-speed type feeder are different in feeding motor, the feeding speed is different even if the drive voltage value is the same. Therefore, in order to feed the welding wire at a feed speed determined by the feed speed setting signal, it is necessary to correct the drive voltage value according to the type of the feeder.

  For the above correction, characteristic data indicating the relationship between the value of the feed speed setting signal and the value of the drive voltage is provided for each type of feeder and stored in the welding power source. When the type of the feeder to be used is determined, the characteristic data corresponding to the selected feeder is set by switching a switch or the like provided in the welding power source. Thereby, regardless of the type of the feeder to be used, the welding wire can be fed at the same feeding speed as the value of the feeding speed setting signal.

  In the invention of Patent Document 1, the welding torch includes an information storage medium that stores information on the welding torch including at least a welding current upper limit setting value, and the arc welding power supply reads the above welding current upper limit setting value to perform welding. The current is controlled to be equal to or lower than the welding current upper limit set value. Thereby, the welding current upper limit set value according to the welding torch can be automatically set.

JP 2012-125814 A

  In the prior art, when the type of the feeder to be used is changed, it is necessary to manually switch the characteristic data indicating the relationship between the feeding speed and the driving voltage stored in the welding power source. Performing this switching at the welding site was a cumbersome operation. Further, if the switching is forgotten, the feeding speed becomes a value different from the desired value, so that there is a problem that the welding current value is not an appropriate value and the welding quality is deteriorated.

  Furthermore, there is a problem that even if a new type of feeder is sold, it cannot be used if the above characteristic data corresponding to the feeder is not stored in the welding power source. Even when the same type of feeder is used, the characteristics of the feeding motor vary from unit to unit, so even if the value of the feeding speed setting signal is the same value, There were variations in the feeding speed. This variation has been a problem when performing high quality welding.

  Therefore, in the present invention, an arc welding apparatus capable of automatically determining the characteristics of a feeding motor provided in the feeder and performing output control corresponding to the determined characteristics, and a feeder used therefor are provided. The purpose is to provide.

In order to solve the above-described problems, the invention of claim 1 is directed to a welding power source that outputs a welding voltage set by a voltage setting signal and a driving voltage set by a feed speed setting signal, and a rotational speed by the driving voltage. In an arc welding apparatus provided with a feeding machine provided with a feeding motor to be controlled,
The feeder includes a storage unit that stores characteristic data related to the feeding motor;
The welding power source reads the characteristic data from the storage unit, and performs output control based on the read characteristic data.
This is an arc welding apparatus.

In the invention of claim 2, the characteristic data is relational characteristic data between the feeding speed and the driving voltage,
The output control in the welding power source is to calculate and output the drive voltage based on the feed speed setting signal and the relational characteristic data.
The arc welding apparatus according to claim 1, wherein:

In the invention of claim 3, the characteristic data is transient characteristic data of the feeding motor,
The output control in the welding power source is such that when both values of the feed speed setting signal and the voltage setting signal are changed, a transient period of the feed speed and a transient of the welding voltage based on the transient characteristic data. Controlling the output of the welding voltage so that the period coincides,
The arc welding apparatus according to claim 1, wherein:

In the invention of claim 4, the characteristic data is inertial characteristic data of the feeding motor,
The output control in the welding power source is to continue the output of the welding voltage for a period based on the inertia characteristic data from that time when the output of the drive voltage is stopped in order to end welding.
The arc welding apparatus according to claim 1, wherein:

  A fifth aspect of the present invention is a feeder that is used in the arc welding apparatus according to any one of the first to fourth aspects.

  According to the present invention, it is possible to automatically determine the characteristics of the feeding motor provided in the feeder and perform output control corresponding to the determined characteristics. For this reason, it is possible to perform optimum output control for the characteristics of the feeder connected to the welding power source when the types of the feeders are different or even when the characteristics are the same. it can. As a result, high quality welding can be performed.

1 is a block diagram of an arc welding apparatus according to an embodiment of the present invention. In the embodiment of the present invention, it is a waveform diagram showing a transient period when the feed speed setting signal Fr and the voltage setting signal Vr are changed. In embodiment of this invention, it is a wave form diagram of each signal during an antistick period.

  Embodiments of the present invention will be described below with reference to the drawings.

  An arc welding apparatus according to an embodiment of the present invention includes a welding power source PS that outputs a welding voltage Vw set by a voltage setting signal Vr and a driving voltage Em set by a feed speed setting signal Fr, and the driving voltage Em. And a feeder FH provided with a feeding motor FM whose rotational speed is controlled by the motor. The feeder FH includes a storage unit MC that stores characteristic data Mc related to the feeding motor FM. The welding power source PS reads the characteristic data Mc from the storage unit MC, and performs output control based on the read characteristic data Mc.

The characteristic data Mc regarding the feeding motor stored in the storage unit MC of the feeder FH is the following three. .
1) Relational characteristic data (characteristic value a) between the feeding speed Fw and the driving voltage Em
A function indicating the relational characteristic data is defined as, for example, the following expression.
Em [V] = a · Fw [m / min] (1) The equation constant a is a characteristic value of each feed motor FM. This characteristic value is measured at the time of quality inspection in the production process of the feeder, and is written in the storage unit MC. For example, a = (24/18), a = (24/20), a = (24 / 18.5), etc. When a = (24/18), the driving voltage Em = 24V is required to achieve a feeding speed of 18 m / min by this feeding motor. In order to obtain a feeding speed of 9 m / min, the drive voltage Em = 12V. In the above description, the function is a linear expression, but it may be defined as a curve such as a quadratic expression.

2) Transient characteristic data of feed motor (characteristic value b)
The transient characteristic data is a characteristic indicating the relationship between ΔFw and the transient time tk [ms] required to change the feeding speed by ΔFw [m / min]. A function indicating this relationship is defined as the following expression, for example.
Tk [ms] = b · ΔFw [m / min] (2) The equation constant b is a characteristic value of each feed motor FM. This characteristic value b is the time length of the transient period Tk when the feed speed Fw is changed by the unit feed speed (1 m / min). This characteristic value b can be measured from the change in the feeding speed Fw during the transient period when the value of the feeding speed setting signal Fr is changed stepwise. The characteristic value b is measured at the time of quality inspection in the production process of the feeder FH and is written in the storage unit MC. For example, characteristic values b = 2, b = 4, b = 2.2, and the like. When b = 2, it takes 2 ms for the feed motor FM to change the feed speed Fw by 1 m / min. In the above description, the function is a linear expression, but it may be defined as a curve such as a quadratic expression.

3) Inertia characteristic data of feed motor (characteristic values c1 and c2)
The inertia characteristic data is the inertia period Td until the rotation completely stops when the application of the drive voltage Em to the feed motor FM rotating at the feed speed Fw [m / min] is stopped. It is a characteristic which shows the relationship with the feeding speed Fw. A function indicating this relationship is defined as the following expression, for example.
Td [ms] = c1 · Fw [m / min] + c2 (3) Equation constants c1 and c2 are characteristic values of the feed motor FM for each unit. The characteristic values c1 and c2 are measured at the time of quality inspection in the production process of the feeder FH and are written in the storage unit MC. For example, c1 = 5 and c2 = 50, c1 = 10 and c2 = 100, c1 = 5.5 and c2 = 60. When c1 = 5 and c2 = 50, the inertia period Td of the feeding motor fed at Fw = 10 m / min is 100 ms. When Fw = 5 m / min, Td = 75 ms. In the above description, the function is a linear expression, but it may be defined as a curve such as a quadratic expression.

  FIG. 1 is a block diagram of an arc welding apparatus according to an embodiment of the present invention. Hereinafter, each block will be described with reference to FIG.

  The arc welding apparatus includes a welding power source PS surrounded by a broken line, a feeder FH surrounded by a broken line, a welding torch 4 and a torch switch SW. The torch switch SW is integrated with the welding torch 4 and outputs a torch switch signal Sw that becomes a high level when the welding operator is turned on and becomes a low level when the welding operator is turned off.

  The feeder FH includes a feeding motor FM, a feeding roll 5, and a storage circuit MC. The feed motor FM receives the drive voltage Em from the welding power source PS, and the rotation speed is controlled by the drive voltage Em. That is, the feeding speed Fw is controlled by the value of the driving voltage Em. When the drive voltage Em = 0, the rotation of the motor is stopped. The feed roll 5 is coupled to a feed motor FM and feeds the welding wire 1.

  The storage circuit MC stores characteristic data related to the feed motor FM, and outputs it as a characteristic data signal Mc to the reading circuit RC of the welding power source PS. As described above, the characteristic data signal Mc includes the relational characteristic data (characteristic value a) between the feeding speed Fw and the driving voltage Em, the transient characteristic data (characteristic value b) of the feeding motor, and the inertial characteristic data of the feeding motor. (Characteristic values c1 and c2). The memory circuit MC is a nonvolatile memory circuit.

  The welding wire 1 is fed through the welding torch 4, and an arc 3 is generated between the welding wire 1 and the base material 2. A welding voltage Vw is applied between the welding wire 1 and the base material 2, and a welding current Iw is conducted.

  The welding power source PS includes a power source main circuit PM, a reading circuit RC, a feeding speed setting circuit FR, an inertia period setting circuit TDR, an anti-stick period setting circuit TAR, a starting circuit ON, a driving voltage setting circuit EMR, a feeding driving circuit EM, A transient time setting circuit TKR, a voltage setting circuit VR, a voltage setting slope circuit VSR, an anti-stick voltage setting circuit VAR, a voltage control setting circuit VCR, a voltage detection circuit VD, a voltage error amplification circuit EV, and a drive circuit DV are provided.

The power supply main circuit PM receives a commercial power supply (not shown) such as three-phase 200V as input, performs inverter control according to the drive signal Dv, and outputs a welding voltage Vw and a welding current Iw for generating the arc 3. Although not shown, the power supply main circuit PM has a primary rectifier that rectifies commercial power, a capacitor that smoothes the rectified direct current, an inverter circuit that converts the smoothed direct current into high frequency alternating current according to the drive signal Dv, high frequency A high-frequency transformer that steps down the alternating current to a voltage value suitable for arc welding, a secondary rectifier that rectifies the stepped-down high-frequency alternating current, and a reactor that smoothes the rectified direct current.

  The reading circuit RC reads the characteristic data signal Mc from the storage circuit MC of the feeder FH, and outputs a relation characteristic data signal Mc (a) between the feeding speed and the driving voltage to the driving voltage setting circuit EMR. The motor transient characteristic data signal Mc (b) is output to the transient time setting circuit TKR, and the feed motor inertia characteristic data signal Mc (c1, c2) is output to the inertia period setting circuit TDR.

  The feeding speed setting circuit FR outputs a predetermined feeding speed setting signal Fr. The inertia period setting circuit TDR receives the feed speed setting signal Fr and the inertia characteristic data Mc (c1, c2) of the feed motor, and receives the inertia period setting signal according to the above-described equation (3) Tdr = c1 · Fr + c2. Calculate and output Tdr. The anti-stick period setting circuit TAR calculates and outputs the anti-stick period setting signal Tar = Tdr + Te with the inertia period setting signal Tdr as an input. Te is a predetermined value. For example, Te = 50 ms. The reason for adding Te is that by continuing to apply the welding voltage Vw for the predetermined value Te from the time when the feed motor FM has stopped after the inertia period, the wire tip is burned up and the welding wire 1 is kept in the mother state. This is to prevent welding with the material 2.

  The start-up circuit ON receives the torch switch signal Sw and the anti-stick period setting signal Tar, and when the torch switch signal Sw becomes high level, it becomes high level, and when it becomes low level, the anti-stick period setting signal starts from that point. An activation signal On which is off-delayed for a period determined by Tar and becomes Low level is output. Therefore, the activation signal On is a signal that becomes a high level during the steady welding period and the anti-stick period in which the torch switch Sw is on.

  The drive voltage setting circuit EMR receives the feed speed setting signal Fr and the relationship characteristic data Mc (a) between the feed speed Fw and the drive voltage Em as input, and the above-described equation (1) Emr = a · Fr To calculate and output the drive voltage setting signal Emr. Thereby, even if the characteristics of the feed motor FM vary, the welding wire 1 can be fed at the feed speed Fw set by the feed speed setting signal Fr. The feed drive circuit EM receives the drive voltage setting signal Emr and the torch switch signal Sw, and when the torch switch signal Sw is at a high level, the error amplification between the drive voltage setting signal Emr and the armature voltage of the feed motor FM is performed. When the drive voltage Em controlled by the value is low level, the drive voltage Em of 0v is output to the feed motor FM of the feeder FH. By this circuit, when the torch switch SW is turned on, a feed start command is issued, and when the torch switch SW is turned off, a feed stop command is issued.

  The transient time setting circuit TKR receives the feed speed setting signal Fr and the transient characteristic data signal Mc (b) of the feed motor, and the feed speed setting signal Fr changes from Fr1 to Fr2 by ΔFr. In this case, the transient time setting signal Tkr is calculated and output by the above-described equation (2) Tkr = b · ΔFr. Thereby, the transient time of the feed motor FM when the feed speed setting signal Fr changes from Fr1 to Fr2 is calculated.

  The voltage setting circuit VR outputs a predetermined voltage setting signal Vr. The voltage setting slope circuit VSR receives the voltage setting signal Vr and the transient time setting signal Tkr, and when the voltage setting signal Vr changes from Vr1 to Vr2, the voltage setting slope circuit VSR starts from Vr1 with a time determined by the transient time setting signal Tkr. A voltage setting slope signal Vsr changing with a slope to Vr2 is output. By this circuit, the voltage setting slope signal Vsr changes from Vr1 to Vr2 so as to coincide with the transient period of the feeding speed Fw when the feeding speed setting signal Fr changes from Fr1 to Fr2. For this reason, the transient period of the feeding speed Fw and the transient period of the welding voltage Vw coincide.

  The anti-stick voltage setting circuit VAR outputs a predetermined anti-stick voltage setting signal Var. The voltage control setting circuit VCR receives the voltage setting slope signal Vsr, the anti-stick voltage setting signal Var and the torch switch signal Sw as inputs, and outputs the voltage setting slope signal Vsr when the torch switch signal Sw is at a high level. The voltage control setting signal Vcr is output. When the level is low, the anti-stick voltage setting signal Var is output as the voltage control setting signal Vcr.

  The voltage detection circuit VD detects the welding voltage Vw and outputs a voltage detection signal Vd. The voltage error amplification circuit EV amplifies an error between the voltage control setting signal Vcr and the voltage detection signal Vd, and outputs a voltage error amplification signal Ev. The drive circuit DV receives the voltage error amplification signal Ev and the activation signal On as described above. When the activation signal On is at a high level, the drive circuit DV performs pulse width modulation control based on the voltage error amplification signal Ev, and outputs the drive signal Dv. Output. Therefore, the welding power source PS is activated during the steady welding period and the anti-stick period in which the torch switch signal Sw is at the high level, and the other engines are deactivated.

  Next, the effect of the arc welding apparatus according to the embodiment of the present invention described above will be described. In the present embodiment, the welding power source PS reads characteristic data relating to the feeding motor from the storage unit MC of the feeder FH, and performs output control based on the read characteristic data. The characteristic data includes a relationship characteristic data signal Mc (a) between the feeding speed and the driving voltage, a transient characteristic data signal Mc (b) of the feeding motor, and an inertial characteristic data signal Mc (c1, c2) of the feeding motor. It is included and has each effect. Hereinafter, the function and effect based on these three characteristic data will be described.

(1) Effects based on the relational characteristic data signal Mc (a) between the feeding speed and the driving voltage Relational characteristic data signal Mc (the feeding speed and driving voltage stored in the memory circuit MC of the feeder FH) a) is read by the reading circuit RC of the welding power source PS and input to the drive voltage setting circuit EMR. In this drive voltage setting circuit EMR, the characteristic value a is substituted into the equation (1) from the relational characteristic data signal Mc (a) between the feed speed and the drive voltage, and the feed motor FM of the connected feed machine FH. An expression is created that is customized for each characteristic. Then, the drive voltage setting circuit EMR receives the feed speed setting signal Fr as an input, and calculates and outputs the drive voltage setting signal Emr based on this customized calculation formula. A drive voltage Em corresponding to the drive voltage setting signal Emr is output from the feed drive circuit EM and applied to the feed motor FM of the feeder FH. As a result, when the characteristics of the feeding motor FM are different because the types of the feeding machines FH are different, or when the characteristics of the feeding motor FM vary even with the same type of feeding machine FH, the feeding motor FM is different. The feed speed Fw with respect to the feed speed setting signal Fr always matches without any variation. For this reason, good welding quality can always be obtained. Further, the above operation does not need to store the characteristic data of the feeding motor FM in the welding power source PS in advance, and is automatically performed when the feeder FH is connected. Setting mistakes do not occur.

(2) Effects based on the transient characteristic data signal Mc (b) of the feed motor The transient characteristic data signal Mc (b) of the feed motor stored in the storage circuit MC of the feeder FH is obtained from the welding power source PS. It is read by the reading circuit RC and inputted to the transient time setting circuit TKR. In this transient time setting circuit TKR, the characteristic value b is substituted into the equation (2) from the transient characteristic data signal Mc (b) of the feed motor for the characteristic of the feed motor FM of the connected feeder FH. A customized arithmetic expression is created. In the transient time setting circuit TKR, when the feed speed setting signal Fr changes from Fr1 to Fr2 by ΔFr, the transient time setting signal Tkr is calculated and output based on this customized calculation formula. . In the voltage setting slope circuit VSR, when the feed speed setting signal Fr changes from Fr1 to Fr2 and the voltage setting signal Vr changes from Vr1 to Vr2, the time is determined from Vr1 by the time determined by the transient time setting signal Tkr. A voltage setting slope signal Vsr changing with a slope to Vr2 is output. Thus, when both values of the feed speed setting signal Fr and the voltage setting signal Vr are changed, the transient period of the feed speed Fw and the transient period of the welding voltage Vw are matched based on the transient characteristic data. The output of the welding voltage Vw is controlled. For this reason, when the characteristics of the feeding motor FM are different because the types of the feeding machines FH are different, or when there are variations in the characteristics of the feeding motor FM even with the same type of feeding machine FH, Since the transient period of the feed speed Fw and the transient period of the welding voltage Vw always coincide with each other, a stable welding state can be maintained.

  FIG. 2 is a waveform diagram showing a transient period when the feed speed setting signal Fr and the voltage setting signal Vr change to explain the above-described operation. FIG. 4A shows the feed speed setting signal Fr, FIG. 4B shows the feed speed Fw, FIG. 4C shows the voltage setting signal Vr, and FIG. 4D shows the voltage setting slope. The signal Vsr is shown, and FIG. 9E shows the welding voltage Vw. Hereinafter, a description will be given with reference to FIG.

  At time t1, the feed speed setting signal Fr becomes faster from Fr1 to Fr2 as shown in FIG. 5A, and at the same time, the voltage setting signal Vr changes from Vr1 to Vr2 as shown in FIG. And higher. In response to this, as shown in FIG. 5B, the feeding speed Fw gradually increases due to the transient characteristics of the feeding motor FM, and converges to the feeding speed corresponding to Fr2 at time t2. A period from time t1 to t2 is a transient period of the feeding speed Fw. On the other hand, since the output of the voltage setting signal Vr is controlled by high-speed inverter control, the welding voltage Vw immediately changes when the set value changes. In such a state, the welding voltage Vw has converged to a value corresponding to Vr2, but the feeding speed Fw has not yet reached a value corresponding to Fr2. As a result, the welding state becomes unstable during the transition period. In order to suppress this, as shown in FIG. 4D, a voltage setting slope signal Vsr having a slope is generated during the period from time t1 to t2, and the welding voltage Vw is set. If it does in this way, as shown to the same figure (E), the welding voltage Vw will also become high gradually from the time t1, and will come to converge at the time t2. That is, the transient period of the feed speed Fw and the transient period of the welding voltage Vw are made to coincide. As described above, the slope period of the voltage setting slope signal Vsr shown in FIG. 4D is calculated from the transient characteristic data of the feeding motor stored in the storage circuit MC of the feeder FH.

(3) Effects based on inertia characteristic data signal Mc (c1, c2) of the feed motor The inertia characteristic data signal Mc (c1, c2) of the feed motor stored in the memory circuit MC of the feeder FH is: It is read by the reading circuit RC of the welding power source PS and input to the inertia period setting circuit TDR. In this inertia period setting circuit TDR, the characteristic values c1 and c2 are substituted into the equation (3) from the inertia characteristic data signal Mc (c1, c2) of the feed motor, and the feed motor FM of the connected feed machine FH is substituted. An expression is created that is customized for each characteristic. Then, the inertia period setting circuit TDR calculates and outputs an inertia period setting signal Tdr based on the customized calculation formula. Then, the anti-stick period setting circuit TAR receives the inertia period setting signal Tdr and outputs an anti-stick period setting signal Tar. In the activation circuit ON, the output of the welding voltage Vw is continued for the anti-stick period determined by the anti-stick period setting signal Tar from the time when the torch switch signal Sw becomes the Low level. Since the anti-stick period is optimized by the inertia characteristic data of the feeding motor, a good anti-stick process (welding end process) can always be performed.

  FIG. 3 is a waveform diagram of each signal during the anti-stick period for explaining the above-described operation. FIG. 4A shows the torch switch signal Sw, FIG. 4B shows the feed speed Fw, FIG. 4C shows the welding current Iw, and FIG. 4D shows the welding voltage Vw. Hereinafter, a description will be given with reference to FIG.

  At time t1, the torch switch signal Sw changes from the high level to the low level as shown in FIG. The period before time t1 is the steady welding period, the period from time t1 to t2 is the inertia period Td, and the period from time t1 to t3 is the antistick period Ta. When the torch switch signal Sw becomes low level, the application of the drive voltage EM to the feed motor FM is stopped, so that the feed speed Fw gradually becomes slower from time t1 due to inertia as shown in FIG. At t2, the stop state becomes zero. As shown in FIG. 5C, the welding current Iw becomes lower than the steady welding period at time t1, and becomes 0A at time t21 between times t2 and t3. Further, as shown in FIG. 4D, the welding voltage Vw becomes an anti-stick voltage value lower than the steady welding period at time t1, increases to the maximum no-load voltage value at time t21, and becomes 0 V at time t3. It becomes. This anti-stick period Ta is optimized according to the inertia characteristic data of the feeding motor.

  According to the above-described embodiment, the feeder includes the storage unit that stores the characteristic data regarding the feeding motor, and the welding power source reads the characteristic data from the storage unit, and performs output control based on the read characteristic data. . Thereby, the characteristic of the feed motor provided in the feeder can be automatically determined, and output control corresponding to the determined characteristic can be performed. For this reason, it is possible to perform optimum output control for the characteristics of the feeder connected to the welding power source when the types of the feeders are different or even when the characteristics are the same. it can. As a result, high quality welding can be performed.

  In the embodiment described above, an IC tag may be used for the memory circuit MC of the feeder FH. At this time, an IC tag reader is used as the reading circuit RC of the welding power source PS.

DESCRIPTION OF SYMBOLS 1 Welding wire 2 Base material 3 Arc 4 Welding torch 5 Feed roll a, b, c1, c2 Characteristic value DV Drive circuit Dv Drive signal EM Feed drive circuit Em Drive voltage EMR Drive voltage setting circuit Emr Drive voltage setting signal EV Voltage Error amplification circuit Ev Voltage error amplification signal FH Feeder FM Feeding motor FR Feeding speed setting circuit Fr Feeding speed setting signal Fw Feeding speed Iw Welding current MC Storage circuit Mc Characteristic data signal Mc (a) Feeding speed Characteristic data signal Mc (b) related to drive voltage Transient characteristic data signal Mc (c1, c2) of the feed motor Inertia characteristic data signal of the feed motor On Start-up circuit On Start-up signal PM Power supply main circuit PS Welding power supply RC Reading circuit SW Torch switch Sw Torch switch signal Ta Anti stick period TAR Anti stick period setting circuit Tar Anti stick Period setting signal Td inertia period TDR inertia period setting circuit Tdr inertia period setting signal Te predetermined value Tk transient period TKR transient time setting circuit Tkr transient time setting signal VAR anti stick voltage setting circuit Var anti stick voltage setting signal VCR voltage control setting circuit Vcr voltage control setting signal VD voltage detection circuit Vd voltage detection signal VR voltage setting circuit Vr voltage setting signal VSR voltage setting slope circuit Vsr voltage setting slope signal Vw welding voltage

Claims (5)

A welding power source that outputs a welding voltage set by a voltage setting signal and a driving voltage set by a feeding speed setting signal, and a feeder provided with a feeding motor whose rotational speed is controlled by the driving voltage. In the arc welding equipment provided,
The feeder includes a storage unit that stores characteristic data related to the feeding motor;
The welding power source reads the characteristic data from the storage unit, and performs output control based on the read characteristic data.
An arc welding apparatus characterized by that. The characteristic data is relational characteristic data between the feeding speed and the driving voltage,
The output control in the welding power source is to calculate and output the drive voltage based on the feed speed setting signal and the relational characteristic data.
The arc welding apparatus according to claim 1. The characteristic data is transient characteristic data of the feeding motor,
The output control in the welding power source is such that when both values of the feed speed setting signal and the voltage setting signal are changed, a transient period of the feed speed and a transient of the welding voltage based on the transient characteristic data. Controlling the output of the welding voltage so that the period coincides,
The arc welding apparatus according to claim 1. The characteristic data is inertial characteristic data of the feeding motor;
The output control in the welding power source is to continue the output of the welding voltage for a period based on the inertia characteristic data from that time when the output of the drive voltage is stopped in order to end welding.
The arc welding apparatus according to claim 1.   The feeder used for the arc welding apparatus of any one of Claims 1-4.

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