JPS6245023B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides an arc welding device that can provide output characteristics of constant voltage characteristics and droop characteristics, and any combination of output current of alternating current and direct current, and that can perform welding using consumable welding wire. This makes it possible to perform any type of welding using consumable electrodes. Generally, arc welding equipment is used that can provide a required output depending on the type of welding method. In other words, there are devices such as carbon dioxide gas arc welding equipment that have constant voltage characteristics and require a DC output current, and devices such as tungsten inert gas arc (TIG) welding equipment that have drooping characteristics and require an AC or DC output current. The welding equipment itself is manufactured, sold, and used separately. However, recently, there has been a demand for a welding device that can be used for multiple welding methods with one welding device as a welding device with higher added value. The present invention was developed in response to such demands, and allows one machine to be used for multiple welding methods, whereas in the past, one machine could only be used for one welding method. It is. EMBODIMENT OF THE INVENTION Hereinafter, the arc welding apparatus of this invention is demonstrated using the drawing of FIG. 1 - FIG. FIG. 1 shows the configuration of an arc welding apparatus according to an embodiment of the present invention as a block circuit. In the figure, 1 is a welding transformer;
This is the input terminal of the primary winding. 2 is a constant voltage CP output characteristic control circuit, 3 is an output voltage regulator that adjusts the output voltage of this constant voltage output characteristic control circuit 2, 4 is a drooping DP output characteristic control circuit,
5 is an output voltage regulator that adjusts the output voltage of this drooping output characteristic control circuit 4; 6 is a switching device that switches the connection between the constant voltage output characteristic control circuit 2 and the drooping output characteristic control circuit 4 and the welding transformer 1; , 7 is a switching device for switching between an AC output current and a DC DC output current, and this switching device 7 has output terminals A and B, and a line on the output terminal B side is connected to obtain DC output power. A rectifier circuit 8 is inserted and connected, whereby an AC output current is taken out from the output terminal A, and a DC output current is taken out from the output terminal B. That is, each of these parts provides two types of output characteristics, constant voltage characteristics and droop characteristics, and two types of output current, AC and DC, and by switching the switching devices 6 and 7, any output can be obtained. . 9 is a high frequency voltage generator for arc starting used in the case of welding with a non-consumable electrode, and from this high frequency voltage generator for arc starting 9, a high frequency high voltage is transmitted to a switching device 7' linked to the switching device 7.
It is taken out from output terminals A and B via. 10 is a welding wire feeding device for feeding a welding wire as a consumable electrode, and this welding wire feeding device 10 is used when welding using a consumable welding wire. The power input to this welding wire feeding device 10 and the arc starting high frequency voltage generating device 9 is switched by a switching device 11. That is, the switching device 1 is changed depending on whether welding is performed using a non-consumable electrode or when welding is performed using a consumable welding wire.
By switching 1, the welding apparatus can be made suitable for various types of welding. According to the arc welding device of the present invention having such a configuration, when a consumable electrode is used by switching the switching device 11 in one welding device, a welding device and a welding device depending on when a non-consumable electrode is used can be used. In addition, by combining it with a power supply device that can provide two types of output characteristics, constant voltage characteristics and droop characteristics, and two types of output current, AC and DC, as shown in Figure 1, various welding methods can be applied. A single arc welding device can satisfy the output and functions according to the requirements. By the way, generally in the arc welding method,
The higher the no-load voltage of welding equipment, the better the arc starting performance tends to be. However, when obtaining the same welding current, the no-load voltage of a general welding equipment with constant voltage characteristics is higher than that of a welding equipment with drooping characteristics. Therefore, according to the present invention, the no-load voltage of the welding transformer is matched to that during the drooping characteristic, so the no-load voltage during the constant voltage characteristic can be made higher than before. , arc starting performance can be improved. The following table shows the welding output obtained from the arc welding apparatus of the present invention and the applicable welding methods.

【table】

[Table] As is clear from this table, eight types of welding output can be obtained by using the configuration shown in Figure 1, and thereby various welding methods (at least eight types) can be performed with one welding device. be able to. FIG. 2 shows an example of a specific circuit configuration of the arc welding apparatus of the present invention, which is shown as a block in FIG. 12 is middle tap 1
an adjustable output voltage with 2a;
As means for adjusting the output voltage, there are methods such as a slide transformer method and a tap switching method. Reference numeral 13 denotes a variable reactor element for obtaining drooping characteristics. This variable reactor element 13 has an intermediate tap 13a and can adjust the output current. As a means for adjusting the output current, a slide reactor method or a movable iron core is used. There are types such as type reactor type and tap-switched reactor type. 14a and 14b are changeover switches whose switching operations are performed in conjunction with each other; one contact of the changeover switches 14a and 14b is connected to one end of the secondary winding of the welding transformer 12; is the intermediate tap 12a of the welding transformer 12.
and the intermediate tap 13 of the variable reactor element 13.
a and a connection portion with one end, and the movable contact sides are connected to each other and connected to the remaining one end of the variable reactor element 13. That is, by switching the changeover switches 14a and 14b, it is possible to switch between the constant voltage characteristic and the drooping characteristic. 15a and 15b are changeover switches whose switching operations are performed in conjunction with each other, and the movable contacts of the changeover switches 15a and 15b are connected to the welding transformer 1.
The remaining one end of the secondary winding No. 2 is connected to one end to which the intermediate tap 13a of the variable reactor element 13 is connected. In addition, the changeover switch 15a
One contact is pulled out as it is and connected to output terminal A.
The other contact is connected to one input side of the rectifier circuit 16. Furthermore, the changeover switch 15
One contact of b is connected to the other input side of the rectifier circuit 16, and the other contact is connected to one of the output sides of the rectifier circuit 16. Also,
The other output side of the rectifier circuit 16 is connected to the output terminal B via a smoothing DC reactor 17. Next, the arc starting high frequency voltage generator 9 and the welding wire feeder 10 will be explained. The arc starting high frequency voltage generator 9 includes a high voltage generating transformer 9a, a high frequency oscillation capacitor 9b, a high frequency generating spark discharge gap 9c, a high frequency superimposing reactor element 9d, high frequency cleaning circuit capacitors 9e ₁ and 9e ₂ , and a high frequency cleaning circuit resistor. It is composed of 9f ₁ , 9f ₂ , 9f ₃ , 9f ₄ ,
A high frequency oscillation capacitor 9b is connected in parallel to the secondary winding of the high voltage generating transformer 9a, and the primary side of a high frequency superimposing reactor element 9d is connected via a high frequency generating spark discharge gap 9c. Further, one end of the secondary winding of the high-frequency superimposition reactor element 9d is directly pulled out and used as an output terminal C, and the other end is connected to the output terminal A via a series circuit of a capacitor 9e ₁ and a resistor 9f ₁ . ing. Furthermore, the resistor 9f ₄ and the capacitor 9e ₂ are connected in parallel to form a parallel circuit, and the series circuit in which the resistor 9f ₃ is connected in series to this parallel circuit is connected to the output terminal B.
and one of the output sides of the rectifier circuit 16. Further, the welding wire feeding device 10 includes a control transformer 10a, a rectifier circuit 10b, a wire feeding speed regulator 10c, and a feeding DC motor 10d. The primary winding of the high voltage generating transformer 9a of the arc starting high frequency voltage generator 9 and the primary winding of the control transformer 10a of the welding wire feeder 10 are connected to a switching device 11. It is connected to input terminals A and B through. Note that here, the AC output current is output from output terminals A and C.
The DC output current can be taken out from between the output terminals B and C. As is clear from the above configuration, the power supply device includes a welding transformer 12 that can adjust the output voltage, a variable reactor element 13 that can adjust the output current, and a switching switch 1.
4a, 14b, 15a, 15b and rectifier circuit 1
6 by connecting them with predetermined wiring,
By combining the high-frequency voltage generator for arc starting 9 and the welding wire feeder 10 with the power supply device, eight types of output can be obtained with one arc welding device, further increasing the added value of the welding device. improves. In FIG. 2, for the sake of simplicity, the case of a single-phase input power supply circuit has been described as an example, but it goes without saying that the present invention can be similarly applied to a three-phase input power supply circuit. Further, the control circuit for constant voltage characteristics and drooping characteristics can also be constructed using a controlled rectifier such as a thyristor. In other words, when using a thyristor, constant voltage characteristics can be obtained by constant firing phase control of the thyristor or firing phase control using output voltage feedback, and drooping characteristics can be obtained by firing phase control using output current feedback. can be obtained. In this case, the output voltage adjustment and the output current adjustment can be performed by controlling the firing phase of the thyristor. Furthermore, a thyristor can also serve as the rectifier circuit. Fig. 3 shows an example of a specific circuit configuration of the arc welding apparatus of the present invention when this thyristor is used. In the circuit of Fig. 3, the same parts as in Fig. 2 are given the same numbers. ing. In the figure, 18 is a welding transformer, 19a to 19d are thyristors, and the thyristors 19a to 19d are
performs output adjustment and rectification adjustment of constant voltage characteristics and drooping characteristics. 20 is this thyristor 1
Ignition phase control circuits 9a to 19d, 21 a smoothing reactor element, 22 a switching device for switching between AC and DC output currents, 23 a voltage detection circuit, 2
4 is a current detection circuit, 25 is a switching device for switching between constant voltage characteristic control and drooping characteristic control, and P and Q are output terminals for taking out the output. Further, 10e is a thyristor for controlling the wire feeding speed, 10f is a firing phase control circuit for this thyristor 10e, and 10g is a current limiting resistor. As described above, according to the arc welding device of the present invention, welding can be performed using either a consumable electrode or a non-consumable electrode, and two types of outputs, constant voltage characteristics and droop characteristics, are available. By combining the characteristics with a power supply device that can obtain two types of output current, AC and DC, eight types of output can be obtained arbitrarily by simply switching the switching device, and the arc starting performance is excellent. Convenient and beneficial effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing an arc welding device according to an embodiment of the present invention, and FIGS. 2 and 3 are electric circuit diagrams showing an example of a specific circuit configuration of the arc welding device of the present invention. 1, 12, 18... Welding transformer, 2... Constant voltage output characteristic control circuit, 3, 5... Output voltage regulator, 4...
Drooping output characteristic control circuit, 6, 7, 7', 11, 2
2, 25... switching device, 8, 16... rectifier circuit, 9...
High-frequency voltage generation circuit for arc starting, 10... Welding wire feeding device, 13... Variable reactor element, 1
4a, 14b, 15a, 15b...changeover switch,
19a, 19b, 19c, 19d...thyristor,
20... Ignition phase control circuit, 23... Voltage detection circuit,
24...Current detection circuit.

Claims (1)

[Scope of Claims] 1. A switch configured to provide two types of output characteristics, constant voltage characteristics and drooping characteristics, and two types of output currents, AC and DC, and switching the output characteristics of the constant voltage characteristics and drooping characteristics. A power supply device is provided with a switching device for switching between alternating current and direct current output current, and can obtain an arbitrary output by switching the switching device, and a welding wire feeder for feeding a welding wire as a consumable electrode. feeding device;
It is equipped with a high-frequency voltage generator for arc starting for generating high-frequency high voltage in welding using non-consumable electrodes, and the operation of the welding wire feeder and the high-frequency voltage generator for arc starting is made non-consumable. An arc welding device characterized in that the welding is switched depending on the case of welding using an electrode or the case of welding using a non-consumable electrode, and the power supply device obtains an output according to the welding. 2. A reactance element is connected to the secondary side of a welding transformer having constant voltage characteristics via a switching device, and the constant voltage characteristics and drooping characteristics are arbitrarily obtained by switching the switching device. An arc welding device according to claim 1. 3. The arc welding apparatus according to claim 1, wherein the arc welding apparatus is configured to arbitrarily obtain constant voltage characteristics and drooping characteristics by controlling the phase of firing of the thyristor.