JP3104508B2 - Arc welding equipment - Google Patents

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 DC current. And an output control circuit for comparing the setting signal from the output control operation unit with the actual welding current and welding voltage and controlling the output. In general, an arc welding apparatus is constituted by a remote control unit connected to a welding power supply unit by a control cable, or by a welding power supply unit having a built-in operation unit.

[0002] The present invention relates to such an arc welding apparatus.

[0003]

2. Description of the Related Art Conventionally, the following two types of arc welding apparatuses are employed. FIG. 4 is a configuration diagram of a conventional arc welding device having an output control operation unit in a welding power supply unit, and FIG. 5 is a configuration diagram of a conventional arc welding device having an output control operation unit in a remote operation device unit. It is.

In FIG. 4, reference numeral 1 denotes an output control element, 2 denotes a drive circuit of the output control element, 3 denotes an output control circuit, and 4 denotes an output control operation section, which are incorporated in a welding power supply section 5.

In FIG. 5, reference numeral 1 denotes an output control element, 2 denotes a drive circuit for the output control element, and 3 denotes an output control circuit. These are incorporated in a welding power supply unit 5, and an output control operation unit 4 is a remote control unit. 6 is built in. Further, a control cable 10 is connected between the welding power supply unit 5 and the remote operation unit 6.
In the conventional arc welding apparatus, since the output control element and the output control circuit are incorporated in the welding power supply, the output characteristics of the arc welding apparatus are determined by the welding power supply.

[0006]

If it is desired 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. 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. Output characteristic 2 is a constant current characteristic, and is an optimal characteristic for an arc welding apparatus using a non-consumable electrode. If an arc welding device with output characteristics 1 and 2 is required, prepare an arc welding device with each output characteristic or incorporate two types of output control circuits in the welding power supply to obtain different output characteristics. I needed to. In an arc welding apparatus having different output characteristics, an output control circuit of a welding power supply unit is complicated, and the manufacturing cost of the arc welding apparatus is increased.

[0008] Among the conventional arc welding apparatuses, a type in which a control cable is connected between a welding power supply section and a remote operation apparatus section as shown in FIG. In a welding operation in a large workshop, it is necessary to extend a long extension cable between a welding power source and a welding operator. This extension cable hinders the work and significantly reduces the work efficiency.

[0009]

In order to solve the above-mentioned problems, according to the present invention, an output control element for controlling a welding output and a drive circuit for driving the output control element are incorporated in a welding power source of an arc welding apparatus. , the remote operation device portion connected by welding power source unit and the cable, seen <br/> write set an output control operation unit for setting a welding output and output <br/> force control circuit for providing an output characteristic to the welding power supply unit Built-in output control circuit that gives different output characteristics
Output characteristics of welding power supply unit using multiple remote control units
Changing .

An output control operation unit is provided in the remote operation device,
A transmission circuit for converting a signal from the output control operation unit into a frequency signal, superimposing the signal on a welding cable using a carrier wave, and transmitting this signal from a remote control unit near an operator to a welding power supply unit is provided. I have. On the welding power source side, a receiving circuit for extracting a signal superimposed on the welding cable is provided.

[0011]

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

Therefore, different output characteristics can be obtained by changing the output control circuit provided in the remote control device. 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, both welding methods can be used simply by changing the remote control unit. Applicable using the same welding power supply.

Further, the output control signal is converted into a frequency signal by a frequency conversion circuit in the remote control unit, and is superimposed on a welding cable using a carrier wave and sent to a welding power supply unit. The control signal is extracted 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 that hinder the welding operation does not increase.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of an arc welding apparatus according to the present invention, 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 device, 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 that function to extract a high-frequency signal placed on the cable 7, and a demodulation circuit 8c that extracts an output characteristic switching signal. 3 is an output control circuit for controlling the output of the 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 for generating a frequency signal corresponding to an analog signal, a carrier port transmission circuit 9b for superimposing an output control signal on a welding cable to generate a carrier wave to be transmitted to the welding power source unit 5, and a carrier frequency conversion circuit 9a And a transformer 9c for superimposing an output control signal on a carrier wave on a welding cable, and a coupling transformer 9c.

The output control element 1, the drive circuit 2, and the receiving circuit 8 of FIG. 1 are installed in the welding power supply unit 5, and the output control circuit 3, the output control operating unit 4, and the transmitting circuit 9 of FIG.
It is installed in.

The welding power source 5 and the remote controller 6 are connected by a welding cable 7. In the embodiment of the arc welding apparatus of the present invention, a multi-core control cable is not used unlike the conventional arc welding machine.

FIG. 2 shows the flow of signals according to this embodiment. The output control circuit 3 outputs an analog signal such as A. In the frequency conversion circuit 9a, a frequency signal indicated by B corresponding to the analog signal is generated. In the carrier wave transmission circuit 9b, a carrier wave indicated by C is generated. The carrier is modulated by the modulation circuit 9c by the frequency signal generated by the frequency conversion circuit 9a, and is converted into a signal as indicated by D. The output control signal carried on the carrier wave is sent to the welding power source via the coupling transformer 9c, the coupling capacitor 9d, and the welding cable 7.

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

Since the conventional machine has a built-in output control circuit 3 for giving output characteristics to the welding power supply unit 5, when changing the output characteristics, the welding power supply unit 5 containing the output control circuit 3 for giving different output characteristics is used. 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 unit 6, when the output characteristics are changed, the output provided in the remote operation unit 6 is changed. What is necessary is just to change the control circuit 3. In other words, by preparing a plurality of remote control units 6 having the output control circuits 3 for providing different output characteristics, and changing the remote control unit 6 using the same welding power source unit 5, the output of the arc welding apparatus is changed. It is possible to change the characteristics.

Further, the output control signal is converted into a frequency signal by the frequency conversion circuit 9a in the remote control device section 6 and is superimposed on the welding cable using the carrier wave and sent to the welding power supply section 5. The output characteristics of the arc welding apparatus can be switched without using a multi-core control cable as in the conventional arc welding equipment.

[0022]

The following advantages are obtained by using the arc welding apparatus of the present invention. (1) Since only one welding power source is installed and the remote control device is replaced, the welding method can be switched to a different welding method, thereby improving the welding operation efficiency. (2) Since only one welding power source is required for a plurality of welding methods, the installation space for the arc welding machine can be reduced. (3) It is not necessary for the welding operator to go to the welding power supply unit and perform the switching operation of the welding method. Therefore, since the welding operator can operate at hand, the efficiency of the operation can be improved. (4) It is not necessary to newly provide a multi-core control cable in order to enable hand operation. Therefore, since the number of cables that hinder the welding operation does not increase, the workability can be improved and the cost can be reduced.

[Brief description of the 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 one embodiment of the present invention.

FIG. 3 (a) shows output characteristics 1 suitable for an automatic arc welding apparatus using a consumable electrode according to an embodiment of the present invention. FIG. 3 (b) shows an arc using a non-consumable electrode according to an embodiment of the present invention. The figure which shows the output characteristic 2 suitable for a welding device

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 apparatus having an output control operation unit in a remote operation device unit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 output control element 2 drive circuit 3 output control circuit 4 output control operation unit 5 welding power supply unit 6 remote control device unit 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

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 9/10 B23K 9/095 B23K 9/32 H02M 9/00

Claims (3)

(57) [Claims] An output control element for controlling a welding output, and the output control element.
A welding power supply unit in which a drive circuit for driving
The output control operation section for setting the direct output and the settings
An output control circuit for giving an output characteristic to the welding power supply unit.
With different remote control devices to provide different output characteristics.
A plurality of the remote control devices incorporating the output control circuit.
An arc welding apparatus, wherein an output characteristic of the welding power supply unit is changed using a mounting unit. 2. 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 are provided in a remote operation device section, and an output control element is provided in a welding power supply section. A drive circuit and a receiving circuit for taking out a signal put on the welding cable are provided, and an output control signal of the output control element is transmitted using the welding cable. 2. The arc welding apparatus 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 transmission circuit that produces
A modulation circuit that modulates a carrier with a signal from the frequency conversion circuit, a coupling capacitor for superimposing a signal on the welding cable, and a coupling transformer are provided, and an output control element in a welding power supply unit. 2. A driving circuit, a coupling capacitor for extracting a signal superimposed on the welding cable, a coupling transformer, and a demodulation circuit for extracting the output control signal.
An arc welding apparatus as described in the above.