JPH07178548A - Arc welding equipment - Google Patents

Abstract

PURPOSE:To improve the efficiency of welding work by assembling an output control circuit and an output control operating part in a remote control device part connected to a welding power source part with a cable TO switch a welding method to a different one only by exchanging a remote control device part. CONSTITUTION:The output control circuit 3 and the output control operating part 4 are assembled in the remote control device part 6. When output characteristic is changed, the output control circuit 3 provided at the remote control device part 6 is exchanged. In other words, plural remote control device parts 6 incorporating the output circuits 3 which supply different kinds of output are prepared, and the output characteristic of an arc welding equipment can be changed by changing the remote control device part 6 by using the same welding power source part 5. Also, since an output control signal is changed to a frequency signal at the frequency conversion circuit 9a of the remote control device part 6 and a carrier is superimposed on a cable for welding and it is sent to the welding power source part 5, the output characteristic of the arc welder can be switched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION An arc welding apparatus sets an output control element using a transistor or a thyristor, a drive circuit using a pulse transformer or a photocoupler, a welding current and a welding voltage in order to obtain a large direct current. It comprises an output control operating section using a variable resistor for controlling the output, and an output control circuit for controlling the output by comparing the setting signal from the output control operating section with the actual welding current and welding voltage. Further, generally, the arc welding apparatus is composed of a remote control device section connected to a welding power source section by a control cable or a welding power source section having a built-in operation section.

The present invention relates to such an arc welding apparatus.

[0003]

2. Description of the Related Art The conventional arc welding apparatus has the following two configurations. FIG. 4 is a configuration diagram of a conventional arc welding device having an output control operation unit in a welding power source unit, and FIG. 5 is a configuration diagram of a conventional example arc welding device having an output control operation unit in a remote operation device unit. Is.

In FIG. 4, 1 is an output control element, 2 is a drive circuit for the output control element, 3 is an output control circuit, and 4 is an output control operation section, which are incorporated in the welding power source section 5.

In FIG. 5, 1 is an output control element, 2 is a drive circuit for the output control element, 3 is an output control circuit, which are incorporated in the welding power source section 5, and the output control operation section 4 is a remote operation device section. Built in 6. A control cable 10 connects the welding power source unit 5 and the remote control unit 6.
In the arc welding apparatus of the conventional example, since the output control element and the output control circuit are incorporated in the welding power source section, the output characteristics of the arc welding apparatus are determined by the welding power source section.

[0006]

In order to obtain different output characteristics with the conventional arc welding apparatus, it is necessary to replace the arc welding apparatus or prepare an output control circuit for obtaining different output characteristics in the welding power source section. It was

FIG. 3 shows an example of the output characteristics of the arc welding apparatus, which will be described. The output characteristic 1 in the figure is a constant voltage characteristic, which is an optimal characteristic for an automatic arc welding apparatus using a consumable electrode. The output characteristic 2 is a constant current characteristic, which is an optimal characteristic for an arc welding device using a non-consumable electrode. If an arc welding machine with output characteristics 1 and 2 is required, prepare an arc welding machine with each output characteristic, or incorporate two types of output control circuits in the welding power source section to obtain different output characteristics. Had to do. In the arc welding apparatus having different output characteristics, the output control circuit of the welding power source section is complicated, which increases the manufacturing cost of the arc welding apparatus.

Further, among the conventional arc welding devices, those of the type in which a control cable is connected between the welding power source part and the remote operation device part as shown in FIG. For welding work in a large workplace, it is necessary to extend a long extension cable between the welding power source and the welding operator. This extension cable interferes with the work and significantly reduces the work efficiency.

[0009]

In order to solve the above problems, the present invention incorporates an output control element and a drive circuit for driving the output control element in a welding power source of an arc welding apparatus,
In the remote control unit connected to the welding power supply unit with a cable,
It incorporates an output control circuit and an output control operation unit.

Further, the remote control device section includes an output control operation section,
A signal is sent from the output control operation unit to a frequency signal, and a carrier wave is used to superimpose it on the welding cable, and a transmitter circuit is provided to transmit this signal from the remote control unit near the worker to the welding power supply unit. There is. Further, on the welding power source side, a receiving circuit for taking out a signal superimposed on the welding cable is provided.

[0011]

In the present invention, the output control element for supplying the welding output to the welding power source section and its drive circuit are incorporated, and the output control circuit for controlling the welding output is not incorporated in the welding power source section. Therefore, the welding power source unit of the arc welding apparatus functions as a power supply controlled by a signal from the external remote control device unit. The output characteristics of the arc welder are determined by the remote control unit, not the welding power source unit.

Therefore, different output characteristics can be obtained by changing the output control circuit provided in the remote control device section. Regardless of whether the constant voltage characteristics are optimal for automatic arc welding using consumable electrodes or the constant current characteristics optimal for arc welding using non-consumable electrodes, you can use either welding method simply by changing the remote control unit. Applicable using the same welding power source.

Further, the output control signal is converted into a frequency signal by the frequency conversion circuit in the remote control device section, superposed on the welding cable by using the carrier wave and sent to the welding power source section, and this output is made on the welding power source side. The control signal is taken from the welding cable.

Therefore, since it is not necessary to newly extend the multi-core control cable to the vicinity of the welding operator, the number of extension cables interfering with the welding operation does not increase.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A configuration diagram of an embodiment of an arc welding apparatus of the present invention is shown in FIG. 1 and will be described below with reference to the drawings. In the figure, 1 is an output control element for controlling the output of the welding apparatus, 2 is a drive circuit for the output control element 1, 8 is a receiving circuit for receiving an output control signal transmitted using a carrier wave, and this receiving circuit 8 is for welding It is disassembled into a coupling capacitor 8a and a coupling transformer 8b which function to extract the high frequency signal placed on the cable 7, and a demodulation circuit 8c for extracting the output characteristic switching signal. 3 is an output control circuit for controlling the output of this arc welding apparatus, 4 is an output control operation unit, 9 is a transmission circuit for transmitting an output control signal on a carrier wave, and this transmission circuit 9 is
A frequency conversion circuit 9a that creates a frequency signal corresponding to an analog signal, a carrier port transmission circuit 9b that creates a carrier wave to be transmitted to the welding power source unit 5 by superimposing the output control signal on the welding cable, and a carrier wave frequency conversion circuit 9a It is composed of a modulation circuit 9c that modulates with the frequency signal created in 1., a coupling capacitor 9d that superimposes the output control signal on the carrier wave on the welding cable, and a coupling transformer 9c.

The output control element 1, the drive circuit 2 and the reception circuit 8 of FIG. 1 are installed in the welding power source section 5, and the output control circuit 3, the output control operation section 4 and the transmission circuit 9 of FIG.
It is installed in.

A welding cable 7 is connected between the welding power source section 5 and the remote control device section 6. The embodiment of the arc welding apparatus of the present invention does not use a multi-core control cable unlike the arc welding machine as in the conventional example.

The signal flow of this embodiment will be described with reference to FIG. An analog signal such as A is output from the output control circuit 3. The frequency conversion circuit 9a produces a frequency signal corresponding to this analog signal as indicated by B. In the carrier wave transmission circuit 9b, a carrier wave indicated by C is created. The carrier wave is modulated by the modulation circuit 9c by the frequency signal generated by the frequency conversion circuit 9a and converted into a signal as shown by D. The output control signal carried on the carrier wave is sent to the welding power source side through the coupling transformer 9c, the coupling capacitor 9d, and the welding cable 7.

On the welding power source side, the output characteristic switching signal carried on the carrier wave is taken out in the reverse flow. The signal indicated by D again becomes an analog signal indicated by A in the demodulation circuit 8c and is sent to the drive circuit 2.

Since the conventional machine has the built-in output control circuit 3 for giving the output characteristic to the welding power source section 5, when changing the output characteristic, the welding power source section 5 having the built-in output control circuit 3 for giving the different output characteristic is incorporated. It was necessary to prepare a plurality of them and change the welding power source unit 5. However, in the arc welding apparatus according to the present embodiment, since the output control circuit 3 and the output control operation unit 4 are incorporated in the remote operation device unit 6, when the output characteristics are changed, the output provided in the remote operation device unit 6 is changed. The control circuit 3 may be changed. In other words, by preparing a plurality of remote operation device units 6 each having a built-in output control circuit 3 that gives different output characteristics, and changing the remote operation device units 6 using the same welding power supply unit 5, the output of the arc welding apparatus can be changed. It is possible to change the characteristics.

Further, since the output control signal is converted into a frequency signal by the frequency conversion circuit 9a in the remote operation device section 6 and superposed on the welding cable by using the carrier wave, the signal is sent to the welding power source section 5. It is possible to switch the output characteristics of the arc welding device without using a multi-core control cable unlike the arc welding equipment of the conventional example.

[0022]

The arc welding apparatus of the present invention has the following advantages. (1) Different welding methods can be switched by simply installing one welding power source and exchanging the remote control device section, thus improving welding work efficiency. (2) Since only one welding power source is required for multiple welding methods, the installation space for the arc welding machine can be reduced. (3) The welding operator does not have to go to the welding power source and switch the welding method. Therefore, the welding operator can operate at his or her own, which improves the work efficiency. (4) It is not necessary to newly provide a multi-core control cable in order to enable the hand operation. Therefore, since the number of cables that interfere with the welding work does not increase, the workability can be improved and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an arc welding apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a flow of an output control signal of the arc welding apparatus in the embodiment of the present invention.

FIG. 3A is a diagram showing an output characteristic 1 suitable for an automatic arc welding apparatus using a consumable electrode according to an embodiment of the present invention. FIG. 3B is an arc using a non-consumable electrode according to an embodiment of the present invention. Diagram showing output characteristic 2 suitable for welding equipment

FIG. 4 is a configuration diagram of a conventional arc welding apparatus having an output control operation unit in a welding power supply unit.

FIG. 5 is a configuration diagram of a conventional arc welding device having an output control operation unit in a remote operation device unit.

[Explanation of symbols]

 1 Output Control Element 2 Drive Circuit 3 Output Control Circuit 4 Output Control Operation Section 5 Welding Power Supply Section 6 Remote Control Device Section 7 Welding Cable 8 Reception Circuit 8a Coupling Capacitor 8b Coupling Transformer 8c Demodulation Circuit 9 Transmission Circuit 9a Frequency Conversion Circuit 9b Carrier wave transmission circuit 9c Modulation circuit 9d Coupling capacitor 9e Coupling transformer

Claims (3)

[Claims] 1. An arc welding apparatus is divided into a welding power source section and a remote control section, an output control element and a drive circuit for the output control element are arranged in the welding power source section, and the output control is performed in the remote control section. An arc welding apparatus, wherein an output control circuit of an element and an output control operation section are arranged, and the output of the welding power source section is controlled by the remote operation device section. 2. A remote control device section is provided with an output control operation section, an output control circuit, and a transmission circuit for placing a signal from the output control circuit on a welding cable, and an output control element in a welding power source section, A driving circuit and a receiving circuit for taking out a signal placed on the welding cable are provided, and an output control signal of the output control element is transmitted using the welding cable. 1. The arc welding device according to 1. 3. An output control operation unit, an output control circuit, a frequency conversion circuit for converting a signal from the output control circuit into a frequency, and a carrier wave for carrying the output control signal on a welding cable. A carrier wave generation circuit that produces
A modulation circuit that modulates a carrier wave with the signal from the frequency conversion circuit, a coupling capacitor for superimposing the signal on the welding cable, and a coupling transformer are provided, and an output control element is provided in the welding power source section. The driving circuit, a coupling capacitor for taking out a signal superimposed on the welding cable, a coupling transformer, and a demodulation circuit for taking out the output control signal are provided.
The described arc welding equipment.