JPH06182548A - Battery arc welding device - Google Patents

Abstract

PURPOSE:To effectively supply the necessary electric power to a welding and to improve the welding workability under stable welding current in a battery arc welder using the commercial power source together with the battery power source. CONSTITUTION:The battery arc welding device is provided with an input current detector 2 for detecting the input current to the primary side of an insulating transformer 3, a control rectifier circuit 4 for controlling so that the input current becomes the constant at the secondary side of the insulating transformer 3 and the battery device 5 connected with the control rectifier circuit 4 in series. By this method, the necessary load voltage to the arc welding can effectively be supplied from the insulating transformer 3 as an auxiliary power source and the welding workability under the stable welding current can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery arc welding apparatus using both a commercial power source and a battery power source.

[0002]

2. Description of the Related Art A conventional battery arc welding apparatus will be described below.

In FIG. 5, 21 is an AC100V commercial power source, 22 is an insulating transformer, 23 is a rectifying element, 24 is a battery charging current suppressing resistor, 25 is an output current limiting resistor,
Reference numeral 26 is an output terminal for connecting the welding rod 27 and the like, and 28 is a DC48V battery device in which a plurality of (four) DC12V batteries are connected in series.

With respect to the battery arc welding apparatus including the above-mentioned components, the relationship and operation of each component will be described.

The welding output is mainly supplied from the DC 28V battery device 28 through the output current suppressing resistor 25, and the insulating transformer 22 supplies the charging current suppressing resistor 2 during the welding operation.
4. The output current superimposed current is supplied through the output current limiting resistor 25.

As shown in FIG. 6, a predetermined arc voltage (JIS load characteristic: 20 + 0.04) necessary for DC arc welding is used.
I, I: output current), it was necessary to output a welding machine output voltage higher than the arc voltage.

Further, the battery device 28 is configured to be charged through the charging current suppressing resistor 24 while the welding work is stopped.

[0008]

However, in the above-mentioned conventional structure, the output of the welding device is mainly the battery device 28.
Since the power is supplied from the output current limiting resistor 25, the efficiency is deteriorated due to the power loss due to the output current limiting resistor 25. Further, the welding current is not stable due to the variation of the arc length during welding, and therefore a good welding result cannot be obtained. Has a problem that a predetermined output current cannot be obtained when the output length becomes long or a long output cable is used.

The present invention solves the above-mentioned conventional problems, and provides a battery arc welding apparatus that effectively supplies electric power required for welding, stabilizes the welding current, and improves the welding workability. To aim.

[0010]

In order to achieve this object, a battery arc welding apparatus of the present invention comprises an input current detector for detecting an input current on the primary side of an insulating transformer, and a secondary side of the insulating transformer. In addition, a control rectifier circuit for controlling the input current to be constant and a battery device connected in series with the control rectifier circuit are provided.

[0011]

In this structure, the load voltage required for arc welding can be effectively supplied from the insulating transformer as the auxiliary power source.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, an insulating transformer 3 which is input from a commercial power source 1 of AC 100 V through an input current detector 2, a control rectifying circuit 4 for controlling and rectifying the input of the insulating transformer 3, and a control rectifying circuit. A DC 24V battery device 5 in which two 12V DC batteries connected in series with the circuit 4 are connected in series, a rectifying element 6 for flowing a battery current, an output current detector 7, and an output current control circuit 8 for keeping the welding current constant.
A circuit switch 9 having contacts 9a and 9b connected to the output current detector 7, an output current smoothing reactor 10, and an output terminal 12 connected to a welding rod 11 or the like.

The circuit switching device 9 is arranged so that the output current detector 7 detects the flow of the output current during the welding operation.
It is connected to the contact 9a side and is configured to be connected to the contact 9b side when the flow of the output current is not detected. In the figure, 13 is a battery charging rectifier, and 14 is a charging current suppressor.

The operation of the battery arc welding machine constructed as above will be described below.

During welding, the output of the battery device 5 is supplied as welding output through the circuit switch 9 (contact 9a), the rectifier 6, the output current control circuit 8 and the output current detector 7.

The welding output is subjected to constant current control by the output current detector 7 and the output current control circuit 8 to obtain output characteristics as shown in FIG. 2 (note that the output characteristics are circuit parts,
It is assumed that there is no voltage drop due to circuit impedance. ).

The commercial power source 1 superimposes it on the output of the battery device 5 through the insulating transformer 3, the control rectification circuit 4, the output current control circuit 8 and the output current detection circuit 7 and supplies it as a welding output.

The input current detector 2 detects the primary current of the insulation transformer 3 and controls the output by the control rectification circuit 4 so that the primary current becomes constant.

The output current and the output voltage when the primary current of the insulating transformer 3 is AC15A were calculated based on the following equations, taking into account the calibration rate from AC to DC, as shown in FIG.

Vac = 1.11 × Vdc (Vac: AC effective voltage, Vdc = DC average voltage) Iac = 1.11 × Idc (Iac: AC effective voltage, Id
That is, c = DC average voltage) That is, by superimposing the output at the time of constant current input (15 A) of the insulation transformer 3 on the output of the battery device 5, the output characteristic as shown in FIG. 4 can be obtained (welding machine). In this embodiment, the no-load voltage is assumed to be DC60V).

In FIG. 4, a straight line A indicates an output load characteristic (V = 20 +) of DC arc welding defined by the JIS standard.
0.04I V: output voltage, I: output current), the straight line B shows the load characteristics when a 22 mm ² extension cable 40 m is connected to the welding machine, and the straight line C shows the same when an extension cable 50 m is connected. The load characteristics are shown.

That is, with the configuration of this embodiment, the load voltage (D
C26V) can be obtained sufficiently, and even with an extension cable connected, DC150A, 5
A welding current of DC140A can be obtained at 0 m connection.

When the welding operation is stopped, that is, when the output current does not flow to the output current detector 7, the circuit switch 9
Is connected to the contact 9b side, the battery device 5 is charged from the insulating transformer 3 via the battery charging rectifier 13 and the charging current suppressor 14.

As described above, according to the present embodiment, the output of the insulation transformer 3 whose constant input current is controlled is superimposed on the voltage of the battery device 5 so that the battery device 5 has a lower voltage of DC 24V than the conventional example. Even a small, lightweight, and inexpensive battery arc welder configured with can effectively supply the output voltage required for welding, and by controlling the output current with a constant current, the welding current is stable and welding work can be performed. The property can also be improved.

The battery device 5 may be charged with a constant current by using the output of the control rectifier circuit 2.

[0027]

As is apparent from the above description, according to the present invention, an input current detector for detecting an input current on the primary side of an insulating transformer and an input current on the secondary side of the insulating transformer are constant. The control rectifier circuit that controls the power and the battery device connected in series with the control rectifier circuit effectively supply the power required for welding, stabilize the welding current, and improve the welding workability. It is possible to realize a battery arc welding device.

[Brief description of drawings]

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

[Fig. 2] DC output characteristic diagram of the battery arc welding apparatus

FIG. 3 is an output characteristic diagram after DC conversion of the output of the insulating transformer when the current is controlled in the battery arc welding apparatus.

[Fig. 4] DC output characteristic diagram of the battery arc welding apparatus

FIG. 5 is a schematic configuration diagram of a conventional battery arc welding device.

FIG. 6 is a DC output characteristic diagram of the battery arc welding device.

[Explanation of symbols]

 2 Input Current Detector 3 Insulation Transformer 4 Control Rectifier Circuit 5 Battery Device 7 Output Current Detector 8 Output Current Control Circuit 9 Circuit Switcher (Charging Means) 13 Battery Charging Rectifier (Charging Means) 14 Charging Current Suppressor (Charging) means)

Claims (3)

[Claims] 1. An input current detector for detecting an input current on the primary side of an insulating transformer, a control rectifier circuit for controlling the input current on the secondary side of the insulating transformer so as to be constant, and the control rectifier. A battery arc welding device with a battery device connected in series with the circuit. 2. The battery arc welding apparatus according to claim 1, wherein the output circuit includes an output current detection circuit and an output current control circuit for keeping the welding current constant. 3. The battery arc welding apparatus according to claim 1 or 2, further comprising charging means for automatically charging the battery device from the output of the insulation transformer while the welding operation is stopped.