JP3006975B2 - Consumable electrode arc welding machine - Google Patents

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 arc welding machine for generating an arc between a welding wire as a consumable electrode and a welding base material as a workpiece to perform welding.

[0002]

2. Description of the Related Art FIG. 3 shows a configuration example of a conventional consumable electrode type arc welding machine. As shown in FIG.
Is a main circuit section 2 as a power circuit for supplying power,
The control circuit unit 3 controls a power supply, a stop command, and welding conditions of the main circuit unit 2.

The wire electrode 4 is fed by a feed motor 5 and is guided by a current-carrying electrode 6 so as to face a welding base material 7.
A welding output voltage is applied to the current-carrying electrode 6 and the welding base material 7 through the connection electrode 13b.

[0004]

Here, the wire electrode 4
Since the welding output voltage applied to the welding base metal 7 is set to a command value only by the control circuit unit 3 regardless of the feeding state of the feeding motor 5 of the wire electrode 4 at the time of welding, the feeding motor The arc length was changed due to the change of the feeding state of No. 5. Also, at the end of welding, as described above,
Regardless of the feeding state of the wire electrode 4, since the individual command values are set only by the control circuit unit 3 depending on the welding method and the wire type, the welding end state of the wire electrode 4 is constant under each welding condition. did not become.

[0005] At the time of welding, variations in the arc length cause poor shielding, blowholes and the like occur, and welding defects occur. Also, at the end of welding, the molten sphere generated at the tip of the wire electrode causes the molten sphere to scatter as spatter at the start of the next welding, and does not generate a good arc, making the welding operation extremely complicated and inefficient. Had become.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and can stabilize the arc length even when the feeding state of the feeding motor fluctuates. It is an object of the present invention to provide a consumable electrode type arc welding machine capable of appropriately controlling the state of the wire electrode tip at the time.

[0007]

In order to solve the above-mentioned problems, a consumable electrode type arc welding machine according to the present invention comprises: a main circuit section for applying a welding voltage between a wire electrode and a welding base material;
Feed motor for feeding the feed electrode, and induction of the feed motor
A voltage proportional signal generating circuit for converting a voltage into an electric signal;
Detection to detect arcing between wire electrode and welding base metal
And an initial voltage setting for setting an initial voltage of the main circuit unit
Circuit, a signal from the detector, and the initial voltage setting circuit
And the signal from the voltage proportional signal generation circuit
And a signal indicating the occurrence of an arc is input from the detector.
Until the signal is output from the initial voltage setting circuit until
After the signal indicating arc occurrence is input from the detector
Switch to output the signal from the voltage proportional signal generation circuit.
A switch to be changed, and a switch based on a signal output from the switch.
A control circuit for controlling a welding output voltage of the main circuit.
Are provided .

[0008]

[Action] In the above structure, during welding, at the welding completion, the command value signal was manually converted <br/> into a voltage proportional signal generating circuit EMF of the feed motor, a command from the initial voltage setting circuit The value signal is switched by a switch and output to the control circuit.
And controls the welding output voltage you applied to word ear electrodes at circuit portion, the welding time is the arc length of Hakare is stabilized in accordance with the feeding condition of the feed motor, also at the time of the end of welding, the welding Under the conditions, the welding end state of the wire electrode tip can be properly controlled, so that the occurrence of blowholes can be prevented, and the generation of molten spheres at the wire electrode tip can be appropriately controlled. Work efficiency can be improved. Therefore, perfect welding from the beginning to the end of welding
Standardization settings to improve welding quality and set welding conditions.
And contribute to the realization of a de-skilled welding machine.
You.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a consumable electrode type arc welding machine according to one embodiment of the present invention. In addition,
The same components as those shown in the conventional example will be described with the same reference numerals. As shown in FIG. 1, the arc welding power supply 15 includes a main circuit section 12 as a power circuit for supplying power, a power supply stop command for the main circuit section 12, and a control for controlling welding conditions.
It comprises a control circuit section 11, an initial voltage setting circuit 9, a voltage proportional signal generation circuit 8, and a switch 10. Further, the wire electrode 4 is fed by a feed motor 5, and is opposed to the welding base material 7 via the energizing electrode 6. The output voltage from the main circuit section 12 is applied to the current-carrying electrode 6 and the welding base metal 7 via the output terminals 13a and 13b, and the voltage application circuit to the welding base metal 7 generates an arc. A detector 14 is provided.

In the above configuration, the voltage proportional signal generation circuit 8
Converts the motor induced voltage of the feed motor 5 into a command value signal and outputs it. The initial voltage setting circuit 9 sets an output voltage until an arc is generated, converts the output voltage into a command value signal, and outputs the command value signal. The switch 10 to which the voltage proportional signal generating circuit 8, the initial voltage setting circuit 9 and the arc generation detector 14 are connected operates between the time when the feed motor 5 starts feeding the wire electrode 4 and the time when the arc is generated. The output voltage command value is switched to the output of the initial voltage setting circuit 9, and when an arc is generated, the command value signal is switched to the output of the voltage proportional signal generation circuit 8 by the electric signal output from the arc generation detector 14. The command value signal switched by the switch 10 is output to the control circuit unit 11, which controls the welding output voltage of the main circuit unit 12 of the arc welding power supply 15. And the welding output voltage is the wire electrode 4 and the welding base material 7.
Applied during

More specifically, as shown in FIG. 2, it is assumed that welding is started at time T0 to perform welding. The welding output voltage at this time starts welding according to a command value signal from the initial voltage setting circuit 9. When the wire electrode 4 starts to be fed at the time T1 during welding and an arc is generated, the electric signal from the arc generation detector 14 indicates
A command value signal is output from the voltage proportional signal generation circuit 8, and an output command value output from the control circuit unit 11 via the switch 10 is set as a welding output voltage. Further, when the welding start is stopped at the welding end time T2, the induced voltage starts to decrease due to the rotation speed of the feed motor 5 decreasing according to the inertia. The motor induced voltage is switched by the voltage proportional signal generation circuit 8 according to each welding condition, and an output command value obtained by outputting the amplified command value signal from the control circuit unit 11 via the switch 10 is set as a welding end output voltage. . In addition, the potential gradient depends on the type of the shielding gas, MIG welding <MAG welding <
Since the order is CO2 welding, the arc length is more likely to increase as MIG welding. Accordingly, since the welding output voltage is in the order of MIG welding <MAG welding <CO2 welding, the amplification factor of the voltage proportional signal generation circuit 8 is changed for each welding method.

As described above, in this embodiment, the welding output voltage can be controlled by the induced voltage of the feed motor 5,
Welding that can cope with fluctuations in the feeding state of the wire electrode 4 becomes possible.

[0013]

As described above, according to the consumable electrode type arc welding machine of the present invention, the main circuit section for applying a welding voltage between the wire electrode and the welding base material, and the feeding module for feeding the wire electrode.
And the induced voltage of the feed motor to an electric signal.
Voltage proportional signal generating circuit, the wire electrode and a welding base material
A detector for detecting the occurrence of an arc between the first and second main circuits;
An initial voltage setting circuit for setting an initial voltage; and
Signal and the signal from the initial voltage setting circuit and the voltage ratio
Example A signal from a signal generation circuit is input and the signal is output from the detector.
The initial voltage until a signal indicating arcing is input
Outputs signal from setting circuit and generates arc from detector
After the signal indicating the voltage is input, the voltage proportional signal generation circuit
A switch for switching to output a signal from the
Welding of the main circuit portion based on a signal output from the heat exchanger.
By providing a control circuit unit that controls the output voltage,
Since the welding output voltage is controlled by the induced voltage of the feed motor of the wire electrode, at the time of welding, the arc length can be stabilized in accordance with the change of the feed state of the feed motor, and at the end of welding, The welding end state of the wire electrode can always be kept constant under each welding condition. Therefore, perfect unified setting is enabled from the start to the end of welding, which contributes to improvement of welding quality and simplification of setting of welding conditions, and can contribute to realization of a de-skilled welding machine. Welding in this way
When controlling the output voltage, control the rotation speed of the feed motor.
Compared to when the control target reaches the target value.
Time lag can be reduced and control response speed is excellent, and arc length
Control can be executed immediately. In addition,
In the wear electrode type arc welding machine, the voltage proportional signal is generated.
Circuits whose amplification factor depends on the shielding gas of the welding base metal
If switching is enabled, the shielding gas may be different.
To achieve the above-mentioned effects in various welding methods
Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram of a consumable electrode type arc welding machine according to one embodiment of the present invention.

FIG. 2 is a timing chart of welding output voltage in the consumable electrode arc welding machine of FIG. 1;

FIG. 3 is a block diagram of a conventional consumable electrode type arc welding machine.

[Explanation of symbols]

 Reference Signs List 4 wire electrode 5 feed motor 6 conducting electrode 7 welding base material 8 voltage proportional signal generating circuit 9 initial voltage setting circuit 10 switch 11 control circuit section 12 main circuit section 13a, 13b output terminal 14 arc generation detector 15 arc welding power supply

Continuation of the front page (56) References JP-A-58-187266 (JP, A) JP-A-60-177962 (JP, A) JP-A-5-57446 (JP, A) JP-A-50-1446547 (JP, A) , A) Hikaru 4-39569 (JP, U) JP-B-44-24257 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 9/073 B23K 9/10 B23K 9/12

Claims (2)

(57) [Claims] 1. A main circuit for applying a welding voltage between a wire electrode and a welding base material, and a feeding mode for feeding the wire electrode.
And an induced voltage of the feed motor are converted into an electric signal.
Voltage proportional signal generation circuit, between the wire electrode and the welding base material
A detector for detecting the occurrence of an arc, and an initial state of the main circuit portion.
An initial voltage setting circuit for setting a voltage; and
Signal and the signal from the initial voltage setting circuit and the voltage proportional
The signal from the signal generation circuit is input to the
The initial voltage setting until a signal indicating
Output a signal from the constant circuit to generate an arc from the detector.
After the signal shown is input, the voltage proportional signal generation circuit
A switch for outputting the signals, and the switch
Welding of the main circuit section based on the signal output from the heater.
Control circuit for controlling the power voltage and consumption Worn electrode arc welding machine provided with. 2. The consumable electrode type arc welding machine according to claim 1, wherein said voltage proportional signal generation circuit has its amplification factor switched according to the shielding gas of the welding base material.