JPH0976072A - Consumable electrode type pulsed arc welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To greatly reduce spatter generation and to stabilize welding by controlling the welding voltage with a voltage control means so as to attain a prescribed welding voltage in the peak period remaining after the elapse of lowered time. SOLUTION: With the released droplet detected by a voltage comparing means, a droplet desorption signal is outputted; and, control is performed by outputting a control signal to an output control means, a control signal by which a welding current is made equal to the lowered current value set by a lowered time setting device 20, only in the peak period in which the droplet release signal is generated, in a current control means, during a prescribed lowered time set by a lowered time setting device 24 from the point of time when the droplet desorption signal is generated. During the peak period remaining after the completion of the lowered time, a voltage control means controls by outputting a control signal to an output control means, a control signal by which the welding voltage is made equal to a prescribed voltage value set by a voltage setting device 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a consumable electrode type pulse arc welding method in which a consumable electrode (hereinafter, referred to as a wire) is automatically fed by using a shield gas containing carbon dioxide as a main component to perform welding. The present invention relates to a consumable electrode type pulse arc welding device for significantly reducing spatter generated therein and stabilizing welding.

[0002]

2. Description of the Related Art In recent years, welding has become an indispensable means, but its stability is a problem.

A conventional consumable electrode type pulse arc welding apparatus will be described below. Conventionally, as an output control means in a pulse arc welding apparatus using a shield gas containing carbon dioxide as a main component, a structure as disclosed in Japanese Patent Publication No. 31630/1990 has been generally used. That is, an arc is generated by alternately energizing a pulse current and a base current, the droplet is separated by a pinch force at the initial stage of pulse energization, and then the wire tip is melted to form a droplet. This is a means for forming droplets when the base is energized.
In such an output control means, there is a risk that droplets may separate during pulse energization, and the separated droplets may be sputtered by receiving a strong arc force due to the pulse current.
FIG. 7 is a waveform diagram showing an example of the welding voltage waveform in this case.

When the current is controlled to be constant during the peak period in order to reduce the spatter generated by receiving a strong arc force due to the pulse current when the droplets are separated,
As shown in FIG. 7, the timing of the droplet separation is detected using the phenomenon that a spike occurs in the welding voltage waveform every time the droplet separates, and the droplet is completely melted starting from that point. The inventor of the present application has already proposed a means for performing control for reducing the influence of the arc force by lowering the welding output before shifting to the pond. With this means, the welding output is reduced each time the droplet is separated by the control of lowering the welding output after detecting the droplet separation. The welding output is compensated for by stabilizing the welding by extending the output so that it is equivalent to the output. Also, if the welding current is controlled to be constant during the peak period, the self-regulating action of the arc will be lost, so by feeding back the welding voltage and adjusting the extension time of the pulse period that detected droplet detachment according to the welding voltage. It stabilizes the welding. FIG. 8 is a waveform diagram showing an example of a welding current waveform obtained when such control is performed.

[0005]

In such a consumable electrode type pulse arc welding apparatus, the arc length becomes longer each time a droplet breaks off. Therefore, if the peak current is controlled to be constant,
The strong arc force due to the pulse current may cause the arc to burn up, further lengthening the arc length. Especially,
This phenomenon remarkably appears when the pulse period after the droplet detachment detection is extended in order to make the output uniform. Therefore, with the above means, it was possible to achieve uniform output during welding and stabilization of the welding to some extent, but the arc length became longer,
If it fluctuates, it may cause arc instability or bad bead shape in the case of high speed welding.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a consumable electrode type pulse arc welding apparatus capable of significantly reducing the amount of spatter and stabilizing welding.

[0007]

The present invention according to claim 1 defines a voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, a peak period and a base period of the welding current. Pulse waveform generating means for generating a pulse signal for controlling the welding current, current control means for outputting a control signal for controlling the welding current, and output control means for controlling the AC power input by the control signal to control the welding output. In the welding apparatus in which the welding current is controlled to have a predetermined peak current value in the peak period and a predetermined base current value in the base period, the welding voltage is a predetermined reference voltage in the peak period. When a voltage comparison means for outputting a droplet detachment signal when exceeding and a voltage control means for outputting a control signal for controlling the welding voltage to a predetermined voltage value are provided. In general, the current control means is provided with a reduction current setting device that sets a reduction current value smaller than the peak current value, and a reduction time setting device that sets a time for controlling the welding current to the reduction current value, The output control means is provided with a signal selector for selectively inputting by switching between the control signal of the current control means and the control signal of the voltage control means, and only during the peak period when the droplet detachment signal is output, The welding current is controlled by the current control means so that the welding current becomes the reduced current value only for the reduction time from the time when the drop-off signal is generated, and the welding voltage is the same during the remaining peak period after the reduction time has elapsed. A consumable electrode type pulse arc welding apparatus, which is controlled by the voltage control means so as to have a predetermined voltage value, and the present invention according to claim 2. Voltage detecting means for detecting a welding voltage, current detecting means for detecting a welding current, pulse waveform generating means for generating a pulse signal defining a peak period and a base period of the welding current, and controlling the welding current A current control means for outputting a control signal,
Output control means for controlling AC power input by the control signal to control welding output, wherein the welding current has a predetermined peak current value in the peak period and a predetermined base current value in the base period. In the welding apparatus controlled as described above, a voltage comparison unit that outputs a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period, and the welding voltage is predetermined through the output control unit. A voltage control means for controlling the voltage value is provided, and a reduction current setting device for setting a reduction current value smaller than the peak current value, and a reduction time setting for setting a time for controlling the welding current to the reduction current value. Is provided in the current control means, and the pulse waveform generation means is provided with a pulse time adjuster for extending the peak period by a predetermined adjustment time. The control means is provided with a signal selector for selectively inputting by switching between the control signal of the current control means and the control signal of the voltage control means, and the pulse waveform generation is performed only during the peak period when the droplet detachment signal is output. The device extends the peak period by the adjustment time, and the current control means via the output control means so that the welding current becomes the reduced current value for the reduction time from the time when the droplet detachment signal is generated. And the voltage control means controls the welding voltage via the output control means so that the welding voltage becomes the predetermined voltage value in the extended peak period remaining after the decrease time. The present invention relates to an electrode type pulse arc welding device, and the present invention according to claim 3 provides voltage detection means for detecting a welding voltage and current detection for detecting a welding current. Stage, a pulse waveform generating means for generating a pulse signal defining a peak period and a base period of the welding current, a current control means for outputting a control signal for controlling the welding current, and an AC power input by the control signal. And a welding control device for controlling the welding output, the welding current being controlled so that the welding current has a predetermined peak current value in the peak period and a predetermined base current value in the base period. In the voltage control means for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period, and a voltage control for controlling the welding voltage to a predetermined voltage value via the output control means. Means for controlling the welding current to the reduced current value, and a reduction current setting device for setting a reduced current value smaller than the peak current value. A setting unit for setting the time for which the welding current is held, a holding current setting unit for setting the holding value of the welding current, and a current comparator for comparing the welding current with the holding value in the current control means. The control means is provided with a signal selector for switching and inputting the control signal of the current control means and the control signal of the voltage control means, and the current control means is provided only during the peak period when the droplet detachment signal is output. Controls through the output control means such that the welding current becomes the reduced current value for the reduction time from the time when the droplet detachment signal is generated, and the voltage control means remains after the reduction time has elapsed. Is controlled through the output control means so that the welding voltage becomes the predetermined voltage value during the peak period, and the welding current exceeds the holding value during the voltage control period. In this case, the current control means is a consumable electrode type pulse arc welding apparatus in which the welding current is controlled to be held at the holding value via the output control means. Is a voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, a pulse waveform generating means for generating a pulse signal defining a peak period and a base period of the welding current, and the welding current. A current control means for outputting a control signal for controlling, and an output control means for controlling an AC power input by the control signal to control a welding output, the welding current being a predetermined peak current value in the peak period,
In a welding device controlled to have a predetermined base current value in the base period, voltage comparison means for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period, A voltage control unit that controls the welding voltage to a predetermined voltage value via the output control unit is provided, and a reduction current setting device that sets a reduction current value smaller than the peak current value, and the welding current is reduced. In the current control means, a decrease time setting device that sets the time for controlling the current value, a holding current setting device that sets the holding value of the welding current, and a current comparator that compares the welding current with the holding value. The pulse waveform generating means is provided with a pulse time adjuster for extending the peak period by a predetermined adjusting time, and the output control means is provided with a control signal of the current control means. A signal selector is provided for selectively inputting by switching the control signal of the voltage control means, and the pulse waveform generator extends the peak period by the adjustment time only for the peak period when the droplet detachment signal is output. ,
The current control means controls through the output control means such that the welding current becomes the reduced current value for the reduction time from the time when the droplet detachment signal is generated,
The voltage control means controls the welding voltage via the output control means so that the welding voltage becomes the predetermined voltage value in the extended peak period remaining after the decrease time has passed,
When the welding current exceeds the holding value in the voltage control period, the current control means controls the welding current to the holding value via the output control means so as to control the consumable electrode type pulse arc. The present invention relates to a welding device, and the present invention according to claim 5 provides a voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, and a pulse defining a peak period and a base period of the welding current. Pulse waveform generating means for generating a signal, current control means for outputting a control signal for controlling the welding current,
Output control means for controlling AC power input by the control signal to control welding output, wherein the welding current has a predetermined peak current value in the peak period and a predetermined base current value in the base period. In the welding apparatus controlled as described above, a voltage comparison unit that outputs a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period, and the welding voltage is predetermined through the output control unit. A voltage control means for controlling the voltage value is provided, and a reduction current setting device for setting a reduction current value smaller than the peak current value, and a reduction time setting for setting a time for controlling the welding current to the reduction current value. A holding current setting device for setting a holding value of the welding current, a holding time setting device for setting a time for holding the welding current at the holding value, and The current control means is provided with a current comparator for comparing the contact current with the held value, and the output control means is a signal for selectively inputting by switching between the control signal of the current control means and the control signal of the voltage control means. A selector is provided, and only during the peak period when the droplet detachment signal is output, the current control unit controls the welding current to be the reduced current value for the decreasing time from the time when the droplet detachment signal is generated. While controlling via the output control means, the voltage control means controls via the output control means such that the welding voltage becomes the predetermined voltage value in the remaining peak period after the decrease time has passed, When the welding current exceeds the holding value in the voltage control period, the current control means holds the welding current at the holding value for the holding time. The present invention relates to a consumable electrode type pulse arc welding device which is controlled through the output control means, and the present invention according to claim 6 is voltage detection means for detecting a welding voltage and current detection for detecting a welding current. Means, pulse waveform generating means for generating a pulse signal defining the peak period and base period of the welding current, current control means for outputting a control signal for controlling the welding current, and AC power input by the control signal And a welding control device for controlling the welding output, the welding current being controlled so that the welding current has a predetermined peak current value in the peak period and a predetermined base current value in the base period. At a voltage comparison means for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period, and the welding voltage is output. A voltage control means for controlling the voltage to a predetermined voltage value via the force control means is provided, and a reduction current setting device for setting a reduction current value smaller than the peak current value, and the welding current is controlled to the reduction current value. A drop time setting device for setting a time, a holding current setting device for setting a holding value of the welding current, a holding time setting device for setting a time for holding the welding current at the holding value, and the welding current A current comparator for comparing with a hold value is provided in the current control means, a pulse time generator for extending the peak period by a predetermined adjustment time is provided in the pulse waveform generating means, and the current control is provided in the output control means. A signal selector for selectively inputting by switching between the control signal of the means and the control signal of the voltage control means,
The pulse waveform generator extends the peak period by the adjustment time only for the peak period during which the droplet break-off signal is output, and the current control unit controls the drop time from the time when the droplet break-off signal is generated. The welding current is controlled via the output control means so as to have the reduced current value, and the voltage control means causes the welding voltage to be the predetermined voltage during the extended peak period remaining after the reduction time. When the welding current exceeds the holding value during the voltage control period, the current control means holds the welding current at the holding value for the holding time. Thus, the consumable electrode type pulse arc welding apparatus is controlled through the output control means.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the pulse waveform generating means includes a pulse time setter for setting a time length of a predetermined peak period and a period length of a predetermined base period, and the peak period and the base period. It can be realized with a pulse waveform generator that generates pulses that are given alternately. Further, when the peak period is extended according to the droplet detachment signal, a pulse time adjuster may be provided and the extended time may be given to the pulse waveform generator. The peak period length, the base period length, and the extension time period are realized by storing and setting in advance in the storage means such as the ROM as the count number of the clock, and the pulse waveform generator uses the clock of the microcomputer. This can be realized by, for example, gate the time base with the count number.

The voltage comparing means compares a welding voltage with the reference voltage setter for setting a predetermined reference voltage, and outputs a droplet detachment signal when the welding voltage exceeds the reference voltage. It can be configured with a voltage comparator.

The current control means includes a current detector for detecting a welding current, a peak current setting device for setting a peak current value, a base current setting device for setting a base current value,
A current controller that compares the welding current detected by the current detector with the peak current value during the peak period given by the pulse signal and the base current value during the base period, and outputs a control signal proportional to the difference. And driving the output control means by the control signal to control the welding current to the peak current value in the peak period and the base current value in the base period, and to control the decreasing current in the peak period. In order to do so, a drop current setter that sets a drop current value and a drop time setter that sets a time for controlling the drop current are provided, and the current controller is similar to the peak current control and the base current control. A holding current setter that outputs a control signal so that the welding current is reduced for a reduction time and also sets the holding current value for controlling the holding current. Provided, it outputs a control signal so that the welding current to the holding current value is controlled so as to retain only the time provided the holding time setting unit in the case of defining the control period.

The voltage control means compares the welding voltage detected by the voltage setting means with a voltage setter for setting a predetermined voltage value with the predetermined voltage value, and outputs a control signal proportional to the difference. A voltage controller is provided, and the output control means is driven by the control signal to control the welding voltage to the predetermined voltage value.

The output control means is provided in the AC input circuit for changing the current distribution angle, such as a semiconductor element, an output control device for driving the output control device, and the output control device. The control signal can be configured by a signal selector for selectively inputting by switching either the control signal of the current controller or the control signal of the voltage controller according to current control or voltage control.

Each of the above setting devices can be realized by a storage means such as a ROM, but can also be realized by a potentiometer in an analog manner. Also, voltage comparator, current controller,
The voltage controller and the voltage controller may be realized by arithmetic processing by program control of a microcomputer or the like, or may be realized by analog processing by an operational amplifier or the like. Further, it goes without saying that the operation of the entire device can be controlled by the program processing of the microcomputer.

Hereinafter, embodiments will be described.

[0015]

【Example】

(Embodiment 1) An embodiment of the consumable electrode type pulse arc welding apparatus of the present invention according to claim 1 will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of this embodiment. In the figure, 1 is an output control element, 2 is a transformer for stepping down the output of the output control element 1 to a voltage suitable for welding, 3 is a rectifying section composed of a diode 3A and a diode 3B, 4 is a coil, and 5 is a wire feed. The wire is fed by the feed motor 6 toward the welding portion of the base material 7, 8 is an electrode, 9 is a welding torch, and 10 is a shunt for detecting a welding current.

A current controller 11 is a pulse time setting device 12
The pulse signal generated by the pulse waveform generator 13 that generates a pulse waveform having the peak time and the base time set in the step (1) and the detected voltage of the voltage detector 14 are used as the reference voltage setting unit 15.
The detection current of the current detector 17 is set by the peak current setting unit 18 in accordance with the droplet separation signal output from the voltage comparator 16 when the detection voltage exceeds the reference voltage by performing a comparison operation with the reference voltage. Peak current or base current setting device 1
The control is performed such that the base current is set at 9 or the reduced current is set at the reduced current setting unit 20. 21
Is a voltage controller that controls the voltage detected by the voltage detector 14 to be the voltage set by the voltage setting device 22; 23 is a current controller 11 and a voltage controller 21 that respond to the pulse signal and the droplet detachment signal. , 24 is a drop time setting device, 25 is a signal selector 23
Is an output controller that controls the output control element 1 in response to the selection signal.

The operation of the above configuration will be described. During welding, the welding voltage detected from the voltage detector 14 and the reference voltage of the reference voltage setting unit 15 are input to the voltage comparator 16, and when the welding voltage exceeds the reference voltage, the droplet is discharged from the wire end. It is determined that the droplet has been detached, and a droplet detachment signal is output. During the peak period of each pulse generated by the pulse waveform generator 13, the current controller 11 detects that the current detected by the current detector 17 is the peak current setting device during the period until the droplet detachment signal is input. A control signal for controlling the current to be set to 18 is output, but the detected current decreases from the time when the droplet detachment signal is input to the decrease time set by the decrease time setting device 24. The control signal for controlling the current to be set is output. In addition, the current controller 11 outputs a control signal for controlling the current detected by the current detector 17 to be the current set by the base current setter 19 during the base period of each pulse.

On the other hand, the voltage controller 21 includes a voltage detector 14
Outputs a control signal for controlling the detected welding voltage to become the set voltage of the voltage setting device 22. Further, the signal selector 23 selects either the control signal of the current controller 11 or the control signal of the voltage controller 21 during welding, and the output controller 2
5 to control the output control element 1. After the output of the output control element 1 is stepped down by the transformer 2,
Is supplied to the wire 5 from the electrode 8 via the coil 4 and the shunt 10 to perform welding.

Next, the operation of the signal selector 23 will be described. During the peak period of each pulse generated by the pulse waveform generator 13, the control signal of the current controller 11 is selected until the droplet detachment signal is input, and the detection current of the current detector 17 becomes the peak current. The current is controlled so as to reach the peak current set by the setting device 18. From the time when the droplet detachment signal is input, at least until the droplet is completely absorbed in the molten pool, that is, the falling time setting device 24 The control signal of the current controller 11 is selected during the fall time set in the step (1), and the detection current of the current detector 17 is changed to the peak current setting unit 18.
Is controlled so as to become the lowering current set by the lowering current setter 20 which is lower than the set current. During the remaining peak period after the end of the falling time, the control signal of the voltage controller 21 is selected, and the detection voltage of the voltage detector 14 is changed to the voltage setting unit 22.
It is controlled so that it becomes the set voltage of. Also, during the base period of each pulse generated by the pulse waveform generator 13, the control signal of the current controller 11 is selected so that the detected current of the current detector 17 becomes the base current set by the base current setter 19. To control.

The set value of the reference voltage setting device 15 differs depending on the wire type, the wire feeding speed, and the welding speed, and in the present invention, the value obtained from the experiment is used. Also,
The period from the time when the droplet is separated from the wire end to the time when it is completely absorbed in the molten pool, that is, the decrease time set by the decrease time setting device 24, and the separated droplet is given only a very weak arc force. As the reduced current set by the reduced current setting device 20, a value obtained by an experiment is used.

By repeating the above operation during welding, the timing at which the droplet separates from the wire end is detected, and the current is supplied at least until the droplet completely moves to the molten pool. By lowering the control, the amount of spatter generated can be greatly reduced, and welding can be stabilized by controlling the welding voltage constant during the remaining peak period.

(Embodiment 2) An embodiment of the consumable electrode type pulse arc welding apparatus of the present invention according to claim 2 will be described below with reference to the drawings. It should be noted that the same components as those in the first embodiment are given the same numbers and their explanations are omitted. The present embodiment is different from the first embodiment in that a pulse time adjuster 26 is newly provided, and a pulse generated by the pulse waveform generator 13 using the setting signal of the pulse time setting device 12 and the droplet detachment signal as input signals. It is to control the signal.

The operation of the above configuration will be described. The description of the operation of the part common to the first embodiment will be omitted. To the pulse time adjuster 26, a droplet separation signal and a setting signal including a peak period signal and a base period signal set by the pulse time setting device 12 are input. During welding, the pulse period adjuster 26 outputs the peak period signal and the base period signal set by the pulse time setter 12 to the pulse waveform generator 13 as they are until the droplet separation signal is input. Further, for the pulse to which the droplet detachment signal is input, the adjustment time Δtp is changed from the pulse time adjuster 26 to the peak period signal tp set by the pulse time setter 12.
The peak period (tp + Δtp) obtained by adding is output to the pulse waveform generator 13. Therefore, in the signal selector 23, which performs signal selection according to the pulse signal and the droplet detachment signal, the peak period of the pulse having the droplet detachment is extended, so that the welding current is reduced to a lower current after the droplet detachment. The period in which the control signal of the voltage controller 21 is selected becomes longer after the lowered time period has ended.

The adjustment time Δtp is subtracted from the base period signal tB set by the pulse time setter 12 so as to obtain a constant pulse period for the pulse to which the droplet detachment signal is input in the pulse time adjuster 26. Base period (t
By outputting the B-adjustment time Δtp) to the pulse waveform generator 13, the same effect can be obtained even if the base period is shortened by the adjustment time Δtp.

By repeating the above operation during welding, the timing at which the droplet separates from the wire end is detected, and the current is applied at least until the droplet completely moves to the molten pool. By lowering the control, the amount of spatter generated is greatly reduced, and during the remaining peak period of the pulse that detects droplet detachment, the period during which the welding voltage is constantly controlled is extended by the adjustment time to ensure a sufficiently long period. This can further stabilize the welding.

(Embodiment 3) An embodiment of the consumable electrode type pulse arc welding apparatus of the present invention according to claim 3 will be described below with reference to the drawings. FIG. 3 is a block diagram showing the configuration of the present embodiment. It should be noted that the same components as those in the first embodiment are given the same numbers and their explanations are omitted. The present embodiment is different from the first embodiment in that a holding current setting device 27 that sets a holding current and a detection current detected by a current detector 17 are compared with the holding current, and the detection current is the holding current. Current comparator 28 that outputs a current holding signal when the voltage exceeds
And the current controller 11 in this embodiment.
Is the peak current set by the peak current setting device 18 or the base current set by the base current setting device 19 or a decrease in the detection current of the current detector 17 according to the pulse signal generated by the pulse waveform generator 13 and the droplet detachment signal. Current setting device 20
When the current holding signal of the current comparator 28 is received after the falling current control period ends, the detection current is controlled to become the holding current. The selector 23 selects either the current controller 11 or the voltage controller 21 according to the pulse signal of the pulse waveform generator 13, the droplet detachment signal, and the current holding signal. is there.

The operation of the above configuration will be described. The description of the operation of the part common to the first embodiment will be omitted. During the peak period of each pulse generated by the pulse waveform generator 13, the current controller 11 controls the current detector 17 during the drop time set by the drop time setter 24 from the time when the droplet detachment signal is input. Output a control signal for controlling the detected current of the lower current to become the set current of the reduced current setting device 20, and after the reduced current control period ends, the current comparator 2
When the current holding signal of No. 8 is received, a control signal for controlling the detected current to become the holding current is output. Also,
During the period until the droplet detachment signal is input during the peak period of each pulse, the control signal of the current controller 11 is selected from the signal selector 23 and output to the output controller 25. The detected current is controlled so as to reach the peak current set by the peak current setting unit 18, but at least from the time when the droplet detachment signal is input until the droplet is completely absorbed in the molten pool, that is, the decrease time. During the decrease time set by the setting device 24, the control signal of the current controller 11 is selected, and the detected current of the current detector 17 is the peak current setting device 18.
Is controlled so as to become the lowering current set by the lowering current setter 20 which is lower than the set current. The control signal of the voltage controller 21 is selected from the signal selector 23 and output to the output controller 25 in the remaining peak period after the decrease time set by the decrease time setter 24 is finished, and the control signal of the voltage detector 14 is output. While controlling the detected voltage to be the set voltage of the voltage setting device 22, the control signal of the current controller 11 is selected again during the remaining peak period from the time when the current holding signal of the current comparator 28 was received. It is output to the output controller 25, and the detected current of the current detector 17 is controlled so as to become the holding current of the holding current setting device 27.

By repeating the above operation during welding, the timing at which the droplet separates from the wire end is detected, and the current is applied at least until the droplet completely moves to the molten pool. By lowering the control, the amount of spatter generated is significantly reduced, and not only is the welding voltage constantly controlled during the remaining peak period of the same pulse that detects droplet detachment, but the arc length due to droplet oscillation etc. It is possible to prevent the welding current from excessively increasing due to fluctuations in the welding temperature and stabilize the welding.

(Embodiment 4) An embodiment of the consumable electrode type pulse arc welding apparatus of the present invention according to claim 4 will be described below with reference to the drawings. FIG. 4 is a block diagram showing the configuration of this embodiment. It should be noted that the same components as those in the third embodiment are given the same reference numerals and the description thereof will be omitted. The present embodiment differs from the third embodiment in that the pulse time adjuster 26 described in the second embodiment is additionally provided.

The operation of the above configuration will be described. It should be noted that the description of the operation of the part common to the third embodiment will be omitted. In the pulse time adjuster 26, as in the second embodiment,
The droplet detachment signal and the set signal of the peak period signal and the base period signal set from the pulse time setting device 12 are input. During welding, the peak time signal and the base time signal set by the pulse time setting device 12 are directly output to the pulse waveform generator 13 from the pulse time adjusting device 26 until the droplet separation signal is input. . For the pulse to which the droplet separation signal is input, the peak period (tp + Δ) obtained by adding the adjustment time Δtp to the peak period signal tp set by the pulse time adjuster 26 from the pulse time adjuster 26.
tp) is output to the pulse waveform generator 13. Therefore, in the signal selector 23 that performs signal selection according to the pulse signal generated from the pulse waveform generator 13 and the droplet separation signal, the peak period of the pulse with droplet separation is extended, and thus the droplet separation is performed. The period in which the control signal of the voltage controller 21 is selected becomes longer after the decrease time for decreasing the detected welding current to the decreasing current at a level lower than the peak current is completed.

In order to obtain a constant pulse period for the pulse to which the droplet detachment signal is input in the pulse time adjuster 26, the adjustment time Δtp is subtracted from the base period signal tB set by the pulse time setter 12. It goes without saying that the same effect can be obtained even if the base period is shortened by outputting the above-mentioned base period (tB-Δtp) to the pulse waveform generator 13.

By repeating the above operation during welding, the timing at which the droplet separates from the wire end is detected, and the current is applied at least until the droplet has completely transferred to the molten pool. By lowering the amount of spatter, the amount of spatter generated is greatly reduced, and the period during which the welding voltage is constantly controlled during the remaining peak period of the pulse that detects droplet detachment is extended to be sufficiently long and It is possible to prevent the excessive increase of the welding current caused by the fluctuation of the arc due to the vibration of the electric field by holding the current and stabilize the welding.

(Embodiment 5) An embodiment of the consumable electrode type pulse arc welding apparatus of the present invention according to claim 5 will be described below with reference to the drawings. FIG. 5 is a block diagram showing the configuration of the present embodiment. The same components as those in the first to fourth embodiments are designated by the same reference numerals and detailed description thereof will be omitted. The present embodiment is different from the third embodiment in that a holding time setting device 29 is provided and the current controller 11 controls the current detector 17 according to the pulse signal generated by the pulse waveform generator 13 and the droplet detachment signal. The detection current is controlled so that it becomes the peak current set by the peak current setting device 18, the base current set by the base current setting device 19, or the reduction current set by the reduction current setting device 20, and the control period of the reduction current ends. After that, the holding time is set when the current holding signal is received from the current comparator 28 which compares the detected current with the holding current of the holding current setting unit 27 and outputs the current holding signal when the detected current exceeds the holding current. The detection current is controlled so as to become the holding current during the holding time set by the device 29, and the signal selector 23 controls the pulse signal of the pulse waveform generator 13, the droplet detachment signal, and the current of the current comparator 28. In that so as to select one of the control signals of the current controller 11 and voltage controller 21 according to a hold signal.

The operation of the above configuration will be described. Note that the description of the operation of the part common to the third embodiment is omitted.
During the peak period of each pulse generated by the pulse waveform generator 13, the current controller 11 detects the current detector 17 at the drop time set by the drop time setter 24 from the time when the droplet detachment signal is input. A control signal is output to control the current so that the current becomes the set current of the drop current setting device 20, and after the drop current control period ends, the current comparator 28 compares the detected current with the holding current of the holding current setting device 27. When a current holding signal is output when the detected current exceeds the holding current by comparison calculation, a control signal for controlling the detected current to be the holding current during the holding time set by the holding time setting unit 29. Is output.

During welding, during the peak period of each pulse generated by the pulse waveform generator 13, the signal selector 2
3, the control signal of the current controller 11 is selected and output to the output controller 25 during the period until the droplet separation signal is input, and the detected current of the current detector 17 is the peak current setting device 1.
Control is performed so that the peak current set in step 8 is reached, but it is set from the time when the droplet detachment signal is input until at least the droplet is completely absorbed in the molten pool, that is, set by the drop time setting device 24. During the drop time, the control signal of the current controller 11 is selected so that the detected current of the current detector 17 is lower than the set current of the peak current setter 18 so as to be the lowered current set by the lowered current setter 20.

The control signal of the voltage controller 21 is selected and output to the output controller 25 during the remaining peak period after the end of the fall time, and the detected voltage of the voltage detector 14 is the set voltage of the voltage setter 22. However, the holding time setting unit 2 starts when the current holding signal from the current comparator 28 is received.
The control signal of the current controller 11 is selected again for the holding time set in 9, and a control signal for controlling the detection current of the current detector 17 to become the holding current of the holding current setting device 27 is output to the output controller 25. Output.

By repeating the above operation during welding, the timing at which the droplet separates from the wire end is detected, and with this as the starting point, at least until the droplet completely moves to the molten pool, the current The amount of spatter generated is greatly reduced by controlling the welding temperature, and not only the welding voltage is controlled to be constant during the remaining peak period of the pulse that detects droplet detachment, but also the arc length due to droplet oscillation etc. It is possible to prevent a temporary excessive increase in the welding current caused by fluctuations in the current by holding the current for a predetermined time and stabilize the welding.

(Embodiment 6) An embodiment of the consumable electrode type pulse arc welding apparatus of the present invention according to claim 6 will be described below. FIG. 6 is a block diagram showing the configuration of the present embodiment. The same components as those in the first to fifth embodiments are designated by the same reference numerals and the description thereof will be omitted. The present embodiment is different from the fifth embodiment in that the pulse time adjuster 26 in the second embodiment is provided.

The operation of the above configuration will be described. The description of the operation of the part common to the fifth embodiment will be omitted. To the pulse time adjuster 26, the droplet detachment signal and the setting signals of the peak period signal and the base period signal set by the pulse time setting device 12 are input. During welding, the pulse time adjuster 26 outputs the peak period signal and the base period signal set by the pulse time setter 12 to the pulse waveform generator 13 as they are until the droplet separation signal is input. Further, for the pulse to which the droplet detachment signal is input, the pulse time adjuster 26 sets the pulse time setter 12
The peak period (tp + Δtp) obtained by adding the adjustment period Δtp to the peak period signal tp set in step 3 is output to the pulse waveform generator 13. Therefore, in the signal selector 23 that performs signal selection according to the pulse signal generated from the pulse waveform generator 13 and the droplet detachment signal, the peak period of the pulse having the droplet detachment signal is extended, The period in which the control signal of the voltage controller 21 is selected becomes longer after the decrease time for decreasing the welding current after the disconnection detection to the decreasing current at a level lower than the peak current is completed.

In the pulse time adjuster 26, the adjustment time Δ is set to the base period signal tB set by the pulse time setter 12 in order to obtain a constant pulse cycle for the pulse to which the droplet detachment signal of the voltage comparator 16 is input. It goes without saying that the same effect can be obtained by outputting the base period (tB-Δtp) obtained by subtracting tp to the pulse waveform generator 13.

By repeating the above operation during welding, the timing at which the droplet separates from the wire end is detected, and the current is supplied at least until the droplet has completely transferred to the molten pool. Not only does it reduce the amount of spatter generated by lowering it, but it also extends the period during which the welding voltage is constantly controlled during the remaining peak period of the pulse that detects droplet detachment to ensure a sufficiently long period. It is possible to prevent the welding current from temporarily increasing excessively due to the variation of the arc length due to the vibration of the droplets and to stabilize the welding.

[0042]

As is apparent from the above description, according to the present invention according to claim 1, the timing at which the droplet separates from the wire end is detected, and at that point at least the droplet is completely melted. Until the transition to the pond, the amount of spatter generated is greatly reduced by controlling the welding current to a lower current value that is smaller than the peak current value. Welding can be stabilized by controlling the welding voltage to a constant value.

According to the present invention of claim 2,
Detects the timing at which the droplet separates from the wire end, and controls it to reduce the welding current to a lower current value that is smaller than the peak current value at least until the droplet has completely transferred to the molten pool. This significantly reduces the amount of spatter generation, extends the peak period length by a predetermined adjustment value, and provides a sufficient period for controlling the welding voltage during the remaining peak period of the same pulse that detected droplet detachment. Welding can be stabilized by ensuring a long time.

According to the present invention of claim 3,
Detects the timing at which the droplet separates from the wire end, and controls it to reduce the welding current to a lower current value that is smaller than the peak current value at least until the droplet has completely transferred to the molten pool. This greatly reduces the amount of spatter generation, stabilizes the welding by controlling the welding voltage constant during the remaining peak period of the same pulse when the droplet detachment is detected, and the welding current is maintained during the constant voltage control. When the predetermined holding current value is exceeded, the holding current value is held, so that the welding current can be prevented from excessively increasing due to the fluctuation of the arc due to the droplet signal or the like.

According to the present invention of claim 4,
Detects the timing at which the droplet separates from the wire end, and controls it to reduce the welding current to a lower current value that is smaller than the peak current value at least until the droplet has completely transferred to the molten pool. This greatly reduces the amount of spatter generation and extends the peak period length of the same pulse that detects droplet detachment by a predetermined adjustment value to keep the welding voltage constant during the remaining peak period of the reduced current value control. To secure a sufficiently long period to control welding to stabilize welding,
And when the welding current exceeds a predetermined holding current value during the constant voltage control, by holding the welding current value,
It is possible to prevent the welding current from excessively increasing due to the fluctuation of the arc due to the droplet signal or the like.

According to the present invention of claim 5,
Control to detect the timing at which the droplet separates from the wire end, and use that as a starting point to reduce the welding current to a predetermined lower current value that is smaller than the peak current value, at least until the droplet completely moves to the molten pool. By doing so, the amount of spatter generated is greatly reduced, and the welding voltage is controlled to be constant during the remaining peak period of the same pulse when droplet detachment is detected and welding is stabilized, and welding is performed during the constant voltage control. When the current exceeds the predetermined holding current value, by holding the welding current at the holding current value for a predetermined holding time, it is appropriate to temporarily increase the welding current excessively due to the fluctuation of the arc due to the vibration of the droplets. Can be prevented.

According to the present invention of claim 6,
Control to detect the timing at which the droplet separates from the wire end, and use that as a starting point to reduce the welding current to a predetermined lower current value that is smaller than the peak current value, at least until the droplet completely moves to the molten pool. By doing so, the amount of spatter generated is greatly reduced, the peak period length of the same pulse that detects droplet detachment is extended for a predetermined adjustment time, and the welding voltage is extended to a constant value during the remaining peak period. By stabilizing the welding by controlling, and when the welding current exceeds a predetermined holding current value during the voltage constant control, by holding the welding current at the holding current value for a predetermined holding time, the droplet It is possible to appropriately prevent a temporary excessive increase in the welding current caused by the fluctuation of the arc due to the vibration of the.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a consumable electrode type pulse arc welding apparatus of the present invention according to claim 1.

FIG. 2 is a block diagram showing the configuration of an embodiment of a consumable electrode type pulse arc welding device of the present invention according to claim 2;

FIG. 3 is a block diagram showing the configuration of an embodiment of a consumable electrode type pulse arc welding device of the present invention according to claim 3;

FIG. 4 is a block diagram showing the configuration of an embodiment of a consumable electrode type pulse arc welding device of the present invention according to claim 4;

FIG. 5 is a block diagram showing the configuration of an embodiment of a consumable electrode type pulse arc welding device of the present invention according to claim 5;

FIG. 6 is a block diagram showing the configuration of an embodiment of a consumable electrode type pulse arc welding device of the present invention according to claim 6;

FIG. 7 is a waveform diagram showing the welding voltage in the conventional consumable electrode type pulse arc welding device.

FIG. 8 is a waveform diagram showing welding voltage in a conventional consumable electrode type pulse arc welding device.

[Explanation of symbols]

 1 Output Control Element 3 Rectifier 4 Coil 5 Wire 10 Shunt 11 Current Controller 12 Pulse Time Setting Device 13 Pulse Waveform Generator 14 Voltage Detector (Voltage Detection Means) 15 Reference Voltage Setting Device 16 Voltage Comparator 17 Current Detector 18 Peak current setting device 19 Base current setting device 20 Drop current setting device 23 Signal selector 24 Fall time setting device 26 Pulse time adjusting device 27 Holding current setting device 28 Current comparator 29 Holding time setting device

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[Procedure amendment]

[Submission date] February 16, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

When the current is controlled to be constant during the peak period in order to reduce the spatter generated by receiving a strong arc force due to the pulse current when the droplets are separated,
As shown in FIG. 7, the timing of the droplet separation is detected using the phenomenon that a spike occurs in the welding voltage waveform every time the droplet separates, and the droplet is completely melted starting from that point. The inventor of the present application has already proposed a means for performing control for reducing the influence of the arc force by lowering the welding output before shifting to the pond. This means, although welding output whenever the droplet leaves the control to lower the welding output from the detection of the droplet detachment is reduced, the pulse duration was lowered welding output After detecting the droplet detachment lowering The welding output is compensated for by stabilizing the welding by extending the output so that it is equivalent to the output. Also, if the welding current is controlled to be constant during the peak period, the self-regulating action of the arc will be lost, so by feeding back the welding voltage and adjusting the extension time of the pulse period that detected droplet detachment according to the welding voltage. and it stabilizes the weld. FIG. 8 is a waveform diagram showing an example of a welding current waveform obtained when such control is performed.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

The present invention according to claim 1 defines a voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, a peak period and a base period of the welding current. Pulse waveform generating means for generating a pulse signal for controlling the welding current, current control means for outputting a control signal for controlling the welding current, and output control means for controlling the AC power input by the control signal to control the welding output. In the welding apparatus in which the welding current is controlled to have a predetermined peak current value in the peak period and a predetermined base current value in the base period, the welding voltage is a predetermined reference voltage in the peak period. When a voltage comparison means for outputting a droplet detachment signal when exceeding and a voltage control means for outputting a control signal for controlling the welding voltage to a predetermined voltage value are provided. In general, the current control means is provided with a reduction current setting device that sets a reduction current value smaller than the peak current value, and a reduction time setting device that sets a time for controlling the welding current to the reduction current value, The output control means is provided with a signal selector for selectively inputting by switching between the control signal of the current control means and the control signal of the voltage control means, and only during the peak period when the droplet detachment signal is output, controls by the <br/> current control means such that the reduction time only the welding current from the time when the droplet detachment signal is generated is the reduction current value, the welding in the remaining peak period has elapsed the reduction time A consumable electrode type pulse arc welding device, wherein the voltage is controlled by the voltage control means so that the voltage becomes the predetermined voltage value.
The present invention according to claim 2 further comprises a voltage detecting means for detecting a welding voltage, and a current detecting means for detecting a welding current.
Pulse waveform generating means for generating a pulse signal defining the peak period and base period of the welding current, current control means for outputting a control signal for controlling the welding current, and controlling the AC power input by the control signal. An output control means for controlling a welding output by the welding apparatus, wherein the welding current is controlled to have a predetermined peak current value in the peak period and a predetermined base current value in the base period, Voltage comparison means for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period, and voltage control means for controlling the welding voltage to a predetermined voltage value via the output control means. Provided, a reduction current setting device for setting a reduction current value smaller than the peak current value, and a time for controlling the welding current to the reduction current value. The current control means is provided with a drop time setting device to be set, the pulse waveform generation means is provided with a pulse time adjuster for extending the peak period by a predetermined adjustment time, and the output control means is provided with the current control means. A signal selector for switching and inputting a control signal and a control signal of the voltage control means is provided, and the pulse waveform generator sets the peak period to the adjustment time only for the peak period when the droplet detachment signal is output. The current control means controls the welding current through the output control means so that the welding current becomes the reduced current value for the reduction time from the time when the droplet detachment signal is generated, and the voltage control means. Is controlled via the output control means so that the welding voltage becomes the predetermined voltage value in the extended peak period remaining after the decrease time. A consumable electrode pulse arc welding apparatus so as to, also, claim 3
According to the present invention, there is provided voltage detection means for detecting a welding voltage, current detection means for detecting a welding current, pulse waveform generation means for generating a pulse signal defining a peak period and a base period of the welding current, A current control unit that outputs a control signal that controls the welding current, and an output control unit that controls an AC power input by the control signal to control a welding output, and the welding current has a predetermined value in the peak period. Peak current value, a welding device controlled to have a predetermined base current value in the base period, a voltage for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period Comparing means and voltage control means for controlling the welding voltage to a predetermined voltage value via the output control means are provided, and more than the peak current value. A drop current setter for setting a drop current value, a drop time setter for setting a time for controlling the welding current to the drop current value, a holding current setter for setting a holding value of the welding current, and The current control means is provided with a current comparator for comparing a welding current with the holding value, and the output control means is a signal for selectively inputting by switching between the control signal of the current control means and the control signal of the voltage control means. A selector is provided, and only during the peak period when the droplet detachment signal is output, the current control unit controls the welding current to be the reduced current value for the decreasing time from the time when the droplet detachment signal is generated. While controlling via the output control means, the voltage control means is configured such that the welding voltage becomes the predetermined voltage value in the remaining peak period after the decrease time has elapsed. Force control means, and when the welding current exceeds the holding value in the voltage control period, the current control means controls the welding current to the holding value via the output control means. According to another aspect of the present invention, there is provided a voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, and a peak of the welding current. A pulse waveform generating means for generating a pulse signal defining a period and a base period, a current control means for outputting a control signal for controlling the welding current, and an AC power input by the control signal to control a welding output. And a predetermined peak current value during the peak period of the welding current,
In a welding device controlled to have a predetermined base current value in the base period, voltage comparison means for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period, A voltage control unit that controls the welding voltage to a predetermined voltage value via the output control unit is provided, and a reduction current setting device that sets a reduction current value smaller than the peak current value, and the welding current is reduced. In the current control means, a decrease time setting device that sets the time for controlling the current value, a holding current setting device that sets the holding value of the welding current, and a current comparator that compares the welding current with the holding value. The pulse waveform generating means is provided with a pulse time adjuster for extending the peak period by a predetermined adjusting time, and the output control means is provided with a control signal of the current control means. A signal selector is provided for selectively inputting by switching the control signal of the voltage control means, and the pulse waveform generator extends the peak period by the adjustment time only for the peak period when the droplet detachment signal is output. ,
The current control means controls through the output control means such that the welding current becomes the reduced current value for the reduction time from the time when the droplet detachment signal is generated,
The voltage control means controls the welding voltage via the output control means so that the welding voltage becomes the predetermined voltage value in the extended peak period remaining after the decrease time has passed,
When the welding current exceeds the holding value in the voltage control period, the current control means controls the welding current to the holding value via the output control means so as to control the consumable electrode type pulse arc. The present invention relates to a welding device, and the present invention according to claim 5 provides a voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, and a pulse defining a peak period and a base period of the welding current. Pulse waveform generating means for generating a signal, current control means for outputting a control signal for controlling the welding current,
Output control means for controlling AC power input by the control signal to control welding output, wherein the welding current has a predetermined peak current value in the peak period and a predetermined base current value in the base period. In the welding apparatus controlled as described above, a voltage comparison unit that outputs a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period, and the welding voltage is predetermined through the output control unit. A voltage control means for controlling the voltage value is provided, and a reduction current setting device for setting a reduction current value smaller than the peak current value, and a reduction time setting for setting a time for controlling the welding current to the reduction current value. A holding current setting device for setting a holding value of the welding current, a holding time setting device for setting a time for holding the welding current at the holding value, and The current control means is provided with a current comparator for comparing the contact current with the held value, and the output control means is a signal for selectively inputting by switching between the control signal of the current control means and the control signal of the voltage control means. A selector is provided, and only during the peak period when the droplet detachment signal is output, the current control unit controls the welding current to be the reduced current value for the decreasing time from the time when the droplet detachment signal is generated. While controlling via the output control means, the voltage control means controls via the output control means such that the welding voltage becomes the predetermined voltage value in the remaining peak period after the decrease time has passed, When the welding current exceeds the holding value in the voltage control period, the current control means holds the welding current at the holding value for the holding time. The present invention relates to a consumable electrode type pulse arc welding device which is controlled through the output control means, and the present invention according to claim 6 is voltage detection means for detecting a welding voltage and current detection for detecting a welding current. Means, pulse waveform generating means for generating a pulse signal defining the peak period and base period of the welding current, current control means for outputting a control signal for controlling the welding current, and AC power input by the control signal And a welding control device for controlling the welding output, the welding current being controlled so that the welding current has a predetermined peak current value in the peak period and a predetermined base current value in the base period. At a voltage comparison means for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period, and the welding voltage is output. A voltage control means for controlling the voltage to a predetermined voltage value via the force control means is provided, and a reduction current setting device for setting a reduction current value smaller than the peak current value, and the welding current is controlled to the reduction current value. A drop time setting device for setting a time, a holding current setting device for setting a holding value of the welding current, a holding time setting device for setting a time for holding the welding current at the holding value, and the welding current A current comparator for comparing with a hold value is provided in the current control means, a pulse time generator for extending the peak period by a predetermined adjustment time is provided in the pulse waveform generating means, and the current control is provided in the output control means. A signal selector for selectively inputting by switching between the control signal of the means and the control signal of the voltage control means,
The pulse waveform generator extends the peak period by the adjustment time only for the peak period during which the droplet break-off signal is output, and the current control unit controls the drop time from the time when the droplet break-off signal is generated. The welding current is controlled via the output control means so as to have the reduced current value, and the voltage control means causes the welding voltage to be the predetermined voltage during the extended peak period remaining after the reduction time. When the welding current exceeds the holding value during the voltage control period, the current control means holds the welding current at the holding value for the holding time. Thus, the consumable electrode type pulse arc welding apparatus is controlled through the output control means.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the pulse waveform generating means includes a pulse time setter for setting a time length and a period length of a predetermined base period in a predetermined peak period, and the peak period and the base period. It can be realized with a pulse waveform generator that generates pulses that are given alternately. Further, when the peak period is extended according to the droplet detachment signal, a pulse time adjuster may be provided and the extended time may be given to the pulse waveform generator. The peak period length, the base period length, and the extension time period are realized by preliminarily storing and setting in a storage means such as a ROM as a clock count number, and the pulse waveform generator uses a time based on a clock of a microcomputer. This can be realized by, for example, gating the base with the count number.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction contents]

The adjustment time Δ is added to the base period signal tB set by the pulse time setting device 12 so as to obtain a constant pulse period for the pulse to which the droplet detachment signal is input in the pulse time adjusting device 26. Base period (t
By outputting the B-adjustment time Δtp) to the pulse waveform generator 13, the same effect can be obtained even if the base period is shortened by the adjustment time Δtp.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction contents]

The operation of the above configuration will be described. The description of the operation of the part common to the fifth embodiment will be omitted. To the pulse time adjuster 26, the droplet detachment signal and the setting signals of the peak period signal and the base period signal set by the pulse time setting device 12 are input. During the period until the droplet detachment signal is input during welding, the pulse time adjuster 26 keeps the peak period signal and the base period signal set by the pulse time setter 12 as they are.
Output to Further, for the pulse to which the droplet detachment signal is input, the pulse time adjuster 26 uses the pulse time setter 1
The peak period signal (tp + Δtp) obtained by adding the adjustment period Δtp to the peak period signal tp set in step 2 is used as the pulse waveform generator 13
Output to Therefore, in the signal selector 23 that performs signal selection according to the pulse signal generated from the pulse waveform generator 13 and the droplet detachment signal, the peak period of the pulse having the droplet detachment signal is extended, The period in which the control signal of the voltage controller 21 is selected becomes longer after the decrease time for decreasing the welding current after the disconnection detection to the decreasing current at a level lower than the peak current is completed.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

In the pulse time adjuster 26, the adjustment time Δ is set to the base period signal tB set by the pulse time setter 12 in order to obtain a constant pulse period for the pulse to which the droplet detachment signal of the voltage comparator 16 is input. It goes without saying that the same effect can be obtained by outputting the base period (tB-Δtp) obtained by subtracting tp to the pulse waveform generator 13.

[Procedure amendment 8]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

[Figure 3]

[Procedure amendment 9]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

[Procedure amendment 10]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

[Figure 5]

[Procedure amendment 11]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

Claims (6)

[Claims] 1. A voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, a pulse waveform generating means for generating a pulse signal defining a peak period and a base period of the welding current, and A current control unit that outputs a control signal that controls a welding current, and an output control unit that controls an AC power input by the control signal to control a welding output, and the welding current has a predetermined peak during the peak period. Current value, voltage comparison for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period in a welding apparatus controlled to have a predetermined base current value in the base period Means and
With a voltage control means for outputting a control signal for controlling the welding voltage to a predetermined voltage value, and a reduction current setting device for setting a reduction current value smaller than the peak current value,
A decrease time setting device that sets a time for controlling the welding current to the decreased current value is provided in the current control means, and the output control means includes a control signal of the current control means and a control signal of the voltage control means. And a signal selector for selectively inputting the signal is provided, and the welding current becomes the reduced current value for the decreasing time only from the time when the droplet separating signal is generated only during the peak period when the droplet separating signal is output. Consumable electrode type pulse arc, which is controlled by the current control means and is controlled by the voltage control means so that the welding voltage becomes the predetermined voltage value during the remaining peak period after the decrease time. Welding equipment. 2. A voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, a pulse waveform generating means for generating a pulse signal defining a peak period and a base period of the welding current, and A current control unit that outputs a control signal that controls a welding current, and an output control unit that controls an AC power input by the control signal to control a welding output, and the welding current has a predetermined peak during the peak period. Current value, voltage comparison for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period in a welding apparatus controlled to have a predetermined base current value in the base period Means and
A voltage control unit that controls the welding voltage to a predetermined voltage value via the output control unit is provided, and a reduction current setting device that sets a reduction current value smaller than the peak current value, and the welding current is reduced. The current control means is provided with a decrease time setting device for setting a time for controlling the current value,
The pulse waveform generation means is provided with a pulse time adjuster for extending the peak period by a predetermined adjustment time, and the output control means is selected by switching between the control signal of the current control means and the control signal of the voltage control means. A signal selector for inputting is provided, the pulse waveform generator extends the peak period by the adjustment time only for the peak period when the droplet detachment signal is output, and the current control means outputs the droplet detachment signal. From the time of occurrence, the welding current is controlled via the output control means so that the welding current becomes the reduced current value for the reduction time, and the voltage control means controls the remaining extended peak period after the reduction time has elapsed. In the consumable electrode type pulse arc welding apparatus, the welding voltage is controlled via the output control means so that the welding voltage becomes the predetermined voltage value. 3. A voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, a pulse waveform generating means for generating a pulse signal defining a peak period and a base period of the welding current, and A current control unit that outputs a control signal that controls a welding current, and an output control unit that controls an AC power input by the control signal to control a welding output, and the welding current has a predetermined peak during the peak period. Current value, voltage comparison for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period in a welding apparatus controlled to have a predetermined base current value in the base period Means and
A voltage control unit that controls the welding voltage to a predetermined voltage value via the output control unit is provided, and a reduction current setting device that sets a reduction current value smaller than the peak current value, and the welding current is reduced. In the current control means, a decrease time setting device that sets the time for controlling the current value, a holding current setting device that sets the holding value of the welding current, and a current comparator that compares the welding current with the holding value. The output control means is provided with a signal selector for selectively inputting by switching between the control signal of the current control means and the control signal of the voltage control means, and only for the peak period when the droplet detachment signal is output, The current control means controls through the output control means such that the welding current becomes the reduced current value for the reduction time from the time when the droplet detachment signal is generated, The voltage control means controls the welding voltage via the output control means so that the welding voltage becomes the predetermined voltage value during the remaining peak period after the decrease time has passed, and the welding current is maintained at the holding voltage during the voltage control period. A consumable electrode type pulse arc welding device in which the current control means controls the welding current to the holding value via the output control means when the value is exceeded. 4. A voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, a pulse waveform generating means for generating a pulse signal defining a peak period and a base period of the welding current, and A current control unit that outputs a control signal that controls a welding current, and an output control unit that controls an AC power input by the control signal to control a welding output, and the welding current has a predetermined peak during the peak period. Current value, voltage comparison for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period in a welding apparatus controlled to have a predetermined base current value in the base period Means and
A voltage control unit that controls the welding voltage to a predetermined voltage value via the output control unit is provided, and a reduction current setting device that sets a reduction current value smaller than the peak current value, and the welding current is reduced. In the current control means, a decrease time setting device that sets the time for controlling the current value, a holding current setting device that sets the holding value of the welding current, and a current comparator that compares the welding current with the holding value. The pulse waveform generating means is provided with a pulse time adjuster for extending the peak period by a predetermined adjusting time, and the output control means switches between the control signal of the current control means and the control signal of the voltage control means. A signal selector for selectively inputting, and only for a peak period when the droplet detachment signal is output, the pulse waveform generator extends the peak period by the adjustment time, The current control means controls the welding current through the output control means so that the welding current becomes the reduced current value for the reduction time from the time when the droplet detachment signal is generated, and the voltage control means controls the reduction time. When the welding current exceeds the holding value in the voltage control period, the welding voltage is controlled to be the predetermined voltage value in the extended peak period after the passage of A consumable electrode type pulse arc welding apparatus in which the current control means controls the welding current to be held at the holding value via the output control means. 5. A voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, a pulse waveform generating means for generating a pulse signal defining a peak period and a base period of the welding current, and A current control unit that outputs a control signal that controls a welding current, and an output control unit that controls an AC power input by the control signal to control a welding output, and the welding current has a predetermined peak during the peak period. Current value, voltage comparison for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period in a welding apparatus controlled to have a predetermined base current value in the base period Means and
A voltage control unit that controls the welding voltage to a predetermined voltage value via the output control unit is provided, and a reduction current setting device that sets a reduction current value smaller than the peak current value, and the welding current is reduced. A decrease time setter for setting a time for controlling the current value, a holding current setter for setting a holding value of the welding current, and a holding time setter for setting a time for holding the welding current at the holding value, A current comparator for comparing the welding current with the holding value is provided in the current control means, and the output control means switches between the control signal of the current control means and the control signal of the voltage control means for selective input. A signal selector is provided, and only during the peak period when the droplet detachment signal is output, the current control means sets the welding current before the drop time from the time when the droplet detachment signal is generated. The voltage control unit controls the output current so that the welding current has the reduced current value, and the voltage control unit controls the output so that the welding voltage has the predetermined voltage value during the remaining peak period after the reduction time. Through the output control means so that when the welding current exceeds the holding value in the voltage control period, the current control means holds the welding current at the holding value for the holding time. Consumable electrode type pulse arc welding equipment controlled by the following. 6. A voltage detecting means for detecting a welding voltage, a current detecting means for detecting a welding current, a pulse waveform generating means for generating a pulse signal defining a peak period and a base period of the welding current, and A current control unit that outputs a control signal that controls a welding current, and an output control unit that controls an AC power input by the control signal to control a welding output, and the welding current has a predetermined peak during the peak period. Current value, voltage comparison for outputting a droplet detachment signal when the welding voltage exceeds a predetermined reference voltage in the peak period in a welding apparatus controlled to have a predetermined base current value in the base period Means and
A voltage control unit that controls the welding voltage to a predetermined voltage value via the output control unit is provided, and a reduction current setting device that sets a reduction current value smaller than the peak current value, and the welding current is reduced. A decrease time setter for setting a time for controlling the current value, a holding current setter for setting a holding value of the welding current, and a holding time setter for setting a time for holding the welding current at the holding value, The current control means is provided with a current comparator for comparing the welding current with the holding value, and the pulse waveform generation means is provided with a pulse time adjuster for extending the peak period by a predetermined adjustment time,
The output control means is provided with a signal selector for selectively inputting by switching between the control signal of the current control means and the control signal of the voltage control means, and the pulse is applied only during a peak period when the droplet detachment signal is output. The waveform generator extends the peak period by the adjustment time, and the current control means controls the output control means so that the welding current becomes the reduced current value for the reduction time from the time when the droplet detachment signal is generated. While controlling via the output control means, the voltage control means controls the welding voltage to be the predetermined voltage value in the extended peak period remaining after the decrease time, When the welding current exceeds the holding value during the voltage control period, the current control means holds the welding current at the holding value for the holding time. Consumable electrode type pulse arc welding device designed to control via the output control means.