JP2014226724A - Arc welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible for an operator to adjust welding machine output by using only two signal lines of an existing torch switch at the place of a welding torch.SOLUTION: In an arc welding device, a circuit in which a torch switch and a diode are connected in series and a circuit in which one more diode is connected in a reverse direction to an output adjuster in series are connected in parallel on a welding torch side, and are connected to two signal lines which connect a welding torch power supply side with a welding torch. An AC rectangular wave oscillation circuit, a comparator circuit and a half wave rectification circuit are provided on the welding torch power supply side, a torch switch signal is detected by an AC half wave, and the magnitude of the signal of the output adjuster is detected by the other half wave, thereby making it possible to transmit two kinds of signals of a start signal and an output adjustment signal via the only two signal lines.

Description

  The present invention relates to a method for adjusting a welding output condition of an arc welding apparatus.

  Patent Document 1 proposes means for easily adjusting the output conditions of an arc welder with the hands of an operator.

  In the arc welding machine described in Patent Document 1, a welding voltage regulator and a welding current regulator are provided at a welding torch, a control unit is provided in a welding power source unit or a wire feeder unit, and a plurality of signal lines are provided therebetween. It is characterized in that it is connected to facilitate adjustment of the welding output.

Since a plurality of signal lines leading to the arc welding power source unit and the torch switch are used, the welding torch cable becomes heavy and obstructs the work. Moreover, since it is necessary to always hold | maintain the weight of these cables during welding, the burden of the operator was increased.

Since the plurality of signal lines are often used in places where metal end surfaces are exposed and are frequently moved, there is a risk of causing problems such as signal line disconnection or short circuit.

Japanese Patent Publication No. 2005-279740

  In the prior invention, the torch cable becomes heavy, increasing the burden on the operator, and has quality problems such as signal disconnection. It is a problem to be solved by the present invention to eliminate the fear of signal disconnection without increasing the weight of the torch cable and to allow the welding operator to adjust the welding output at the welding torch.

  This arc welding equipment has another diode in series so that the torch switch and diode connected in series to the welding torch and the diode connected in series to the output regulator and torch switch are opposite. These are connected in parallel and connected to two signal lines.

An AC rectangular wave oscillation circuit is provided on the arc welding power source side, and the output of the AC rectangular wave is applied to the signal lines of the two torch switches. Also, the welding power source side is provided with a comparator circuit for determining the magnitude of the voltage of the two signal lines and a half-wave rectifier circuit, and these comparator circuit and half-wave rectifier circuit were added to the two signal lines. A diode is connected in series to the comparator circuit and the half-wave rectifier circuit so that it operates by receiving either half-wave signal of the voltage, and the direction of the diode connected in series to the half-wave rectifier circuit is the comparator It is connected in the opposite direction to the diode connected in series with the circuit.

In the present invention, the positive half-wave and the negative half-wave of the rectangular wave AC signal are respectively assigned as a welding start signal and a welding output adjustment signal. By doing so, two different signals, the torch switch signal and the welding output adjustment signal, are sent from the welding torch side to the welding power source side using the signal lines of the two torch switches that have reached the welding torch. Is transmitted to.

  In the arc welding apparatus of the present invention, since the output conditions can be adjusted at the welding torch, the operator interrupts the welding operation and moves to the welding power source or the remote controller in order to adjust the welding conditions. It is not necessary.

The welding condition can be adjusted using two signal lines connecting the welding power source and the existing torch switch used for the welding torch, so a dedicated signal line has been added to allow output adjustment at hand. Never do.

Since no signal line is added, the weight of the welding torch carried by the operator is not increased. Therefore, the moving work becomes easy, and the efficiency of the welding work and the improvement of the mobility can be achieved.

Configuration of arc welding apparatus of the present invention The adjustment volume of the arc welding apparatus of the present invention is a circuit diagram of one type of welding torch side The adjustment volume of the arc welding apparatus of the present invention is a circuit diagram of two types of welding torch side Time chart for explaining a welding output adjusting method of the arc welding apparatus of the present invention Torch for welding of arc welding apparatus of the present invention

  FIG. 1 shows the configuration of the arc welding apparatus of the present invention, FIG. 2 shows the adjustment volume of the arc welding apparatus of the present invention, and the circuit diagram of one kind of welding torch. FIG. 3 shows the adjustment volume of the arc welding apparatus of the present invention. The circuit diagram of the two types of welding torch side is shown. 1, 2, and 3, 1 is a welding torch side, 1-1 is a diode, 1-2 is a diode, 1-3 is a torch switch, 1-4 is an output regulator, 2 is a welding power source side, 2 -1 is an AC rectangular wave oscillation circuit, 2-2 is a half-wave rectifier circuit, 2-3 is a comparator circuit, 2-4 is a diode, 2-5 is a diode, 3 is two signal lines, 4 in FIG. Is a capacitor, 5 is a coil, 6 is a welding current regulator, and 7 is a welding voltage regulator.

  1 and 2, on the welding torch side, a torch switch of 1-3 and a diode of 1-1 are connected in series, an output regulator of 1-4 and a diode of 1-2 are connected in series. These are connected in parallel and connected to 2 signal lines. The diodes 1-2 and 1-3 are designed so that the direction of current flow is reversed.

As shown in FIG. 1, a 2-1 AC rectangular wave oscillation circuit is provided on the arc welding power source side, and an AC rectangular wave signal is applied to the signal lines of two torch switches. Connect the 2-4 diode and 2-2 comparator circuit connected in series, and the 2-5 diode and 2-2 half-wave rectifier circuit connected in series to the two signal lines. ing.
The diodes 2-5 and 2-4 are connected so that their directions are opposite to each other.

  FIG. 4 shows a time chart for explaining the welding output adjusting method of the arc welding apparatus of the present invention. When the output adjuster of 1-4 on the welding torch side rotates, the amplitude of the negative half wave of the rectangular wave changes according to the change of the adjustment value. The negative half wave of this rectangular wave is rectified by a half wave rectifier circuit 2-2 to obtain a welding output adjustment signal.

When the 1-3 torch switch is turned on, the welding power source side 2-3 comparator circuit determines that the positive half-wave signal of the rectangular wave signal is 0 V, and the torch switch is turned on. Judging. As shown in Fig. 4, there is a delay of up to half a cycle of the AC rectangular wave signal until the start signal is actually transmitted to the welding power source after the torch switch is pressed. There is no problem in use.

FIG. 3 is a circuit diagram in which two types of adjustment volumes of a welding current adjuster and a welding voltage adjuster of the arc welding apparatus of the present invention are provided on the welding torch side. A coil of 5 is connected in series with the 1-1 torch switch so that high-frequency AC components do not flow, and the opening / closing operation of the torch switch is detected by DC. The method of Fig. 3 uses a positive half-wave and a negative half-wave of DC and AC to transmit signals.

The welding current regulator of 6 and the welding voltage regulator of 7 are connected so that the diodes are connected in different directions in series, and are coupled using 4 capacitors between the connection point and the two signal lines. . Therefore, only an alternating current flows through the welding current regulator and the welding voltage regulator. On the welding power source side, the welding current adjustment signal and the welding voltage signal are taken out separately using positive and negative half waves of alternating current.

Both the circuits in Fig. 2 and Fig. 3 use an AC square wave, and the positive half wave and negative half wave are assigned to two different types, and these signals are separated and extracted by diodes. Therefore, in the case of Fig. 2, it is possible to transmit two kinds of signals using only two signal lines using DC positive and AC positive half waves and negative half wave, and in Fig. 3 AC positive half waves. And allows transmission of three types of signals using negative half-waves.

The two signal lines connecting the welding torch and the welding power source are used as signals for the torch switch in any arc welding apparatus, and the present invention uses these two existing signal lines as they are, and the torch switch Since transmission of signals other than signals is possible, no new signal lines are added.

In the embodiment of the present invention, if the frequency of the AC rectangular wave signal is too low, it takes time until the welding output is actually output after the torch switch is pressed. If this time is long, the efficiency of the welding operation is deteriorated, and the sense of unity with the equipment is impaired, which is disliked by the welding operator. Conversely, if the frequency is too high, it may propagate in the air and cause radio interference. Experimentally, it has been found that the AC frequency of the AC rectangular wave signal is appropriate from 5 Hz to 450 kHz, and is selected from 5 Hz to 450 kHz here.

Since the welding torch is frequently moved and used, impact and unnecessary contact can be considered. Therefore, when attaching an output adjustment part to a welding torch, it is necessary to prevent an output adjustment value from changing unintentionally during welding. As shown in FIG. 5, in the welding torch of the arc welding apparatus of the present invention, the knob of the output regulator is attached to the lower surface of the torch holder of the welding torch to prevent the adjustment knob from rotating due to unintended contact. The anti-rotation mechanism is attached. The output regulator is embedded in the torch holder so as not to be damaged by impact.

  The present invention makes it possible to reduce the movement work of the welding operator to reach the welding power source for adjusting the welding conditions. Therefore, it is expected that it can contribute to the improvement of efficiency and mobility of welding work. The present invention has a great effect when applied to an arc welding machine in which the output conditions must be frequently adjusted particularly in a wide work place, and therefore, the possibility of industrial use is high.

1 Welding torch side
1-1 Diode
1-2 Diode
1-3 Torch switch
1-4 Output adjuster
2 Welding power supply side
2-1 AC square wave oscillator
2-2 Half-wave rectifier circuit
2-3 Comparator circuit
2-4 Diode
2-5 Diode
3 Two signal lines
4 capacitors
5 coils
6 Welding current adjuster
7 Welding voltage regulator
8 Torch holder
9 Adjustment knob 10 Anti-rotation mechanism

Claims (4)

  A torch switch and a diode connected in series to a welding torch, and a diode connected in series so that the direction of the current flowing to the output regulator and the diode connected in series to the torch switch is reversed. Connected in parallel and connected to two signal lines connecting the welding power source side and the welding torch, and provided with an AC rectangular wave oscillation circuit on the welding power source side, the output of the rectangular oscillation circuit and the voltage of the two signal lines A comparator circuit and a diode connected in series, and a diode and a half-wave rectifier circuit connected in series are connected between the two signal lines and connected in series with the comparator circuit. A diode connected in series with the half-wave rectifier circuit in a direction in which the signal of the output regulator is detected. An arc welding apparatus characterized by that.   A torch switch and a coil are connected in series to a welding torch, connected to two signal lines connecting the welding power source side and the welding torch, a diode in series with the welding current regulator, and the welding current regulator A diode connected in series with a welding voltage regulator is connected in parallel so that the direction of current flow is opposite to that of the diode connected in series, and a capacitor is connected to one of the connection points of the parallel circuit. Are connected in series and connected to the two signal lines, an AC rectangular wave oscillation circuit is provided on the welding power source side, and a comparator circuit for discriminating the magnitude of the DC voltage of the two signal lines is provided. Connect to the signal line, connect the diode and the half-wave rectifier circuit in series, and connect the diode and the other half-wave rectifier circuit in series opposite to the diode and the diode of the half-wave rectifier circuit Connect the things to the two signal lines, arc welding apparatus the output of the AC rectangular wave oscillation circuit is added to the signal lines of the two torches switch. The arc welding apparatus according to claim 1 and 2, wherein a frequency of the AC rectangular wave oscillation circuit is set to 5 Hz to 450 kHz.   The adjustment knobs of the output regulator, welding current regulator and welding voltage regulator are attached to the side surface of the torch holder of the welding torch, and the torch holder is provided with an anti-rotation mechanism for preventing inadvertent rotation of the adjustment knob. The arc welding apparatus according to claim 1 or 2, characterized by the above.