JP3591040B2 - Arc welding equipment - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an arc welding apparatus, and more particularly to an arc welding apparatus that performs unified adjustment of welding conditions.
[0002]
[Prior art]
Generally, an arc welding apparatus is provided with a welding current setting section and a welding voltage setting section in a welding power supply section, and uses a variable resistor provided in a remote control section connected to the welding power supply section with a control cable to perform welding current and welding. The voltage is adjusted. Recently, the number of types in which the optimum welding voltage corresponding to each welding current is automatically determined has increased. Such automatic determination of the optimum welding voltage for the welding current is called unified adjustment of welding conditions.
[0003]
Such unified adjustment of welding conditions is performed in arc welding because the work of setting the welding current and the welding voltage most suitable for the thickness and shape of the work to be welded requires considerable skill and experience. In recent years, some arc welding apparatuses have incorporated a microcomputer in order to reduce such troublesome setting of welding conditions by a welding operator.
[0004]
Hereinafter, an arc welding apparatus incorporating a conventional microcomputer will be described with reference to the drawings.
[0005]
FIG. 2 is a schematic configuration diagram of a conventional arc welding apparatus. In FIG. 2, the arc welding apparatus includes a welding power source unit 11 and a remote control unit 12, which are connected by a control cable (not shown). 5 is a welding current setting section, 6 is a welding voltage setting section, 7 is a variable resistor for adjusting welding current, 8 is a variable resistor for fine adjustment of welding voltage, 9 is a microcomputer, 10 is a centralized welding condition data table. ROM.
[0006]
The operation of the conventional arc welding apparatus configured as described above will be described below. The welding current set value set by the welding current adjustment variable resistor 7 and the welding voltage set value set by the welding voltage fine adjustment variable resistor 8 are applied to the microcomputer 9. In the microcomputer 9, data necessary for obtaining the welding current and the welding voltage corresponding to the welding current set value and the welding voltage set value set by the respective variable resistors 7 and 8 are integrated into a welding condition data table. From the ROM 10, and added to the welding current setting unit 5 and the welding voltage setting unit 6. The welding current setting unit 5 receives a signal from the microcomputer 9 and controls the welding current so that the welding current is set by the welding current adjusting variable resistor 7. Similarly, the welding voltage setting unit 6 controls the output voltage to be the welding voltage set by the variable resistor 8 for fine adjustment of the welding voltage.
[0007]
That is, in the conventional arc welding apparatus, a combination of welding voltage and welding current, which are welding conditions necessary for performing an appropriate arc welding, is set in ROM and this data is used by a microcomputer. And take it out.
[0008]
[Problems to be solved by the invention]
However, a microcomputer 9 and a non-rewritable ROM 10 are used in the conventional arc welding apparatus in order to enable unified adjustment of welding output conditions. In addition, there is a problem that the protection circuit against noise is complicated and the manufacturing cost of the welding device is increased.
[0009]
An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an arc welding apparatus capable of unitarily adjusting a welding output condition with an extremely simple circuit configuration.
[0010]
[Means for Solving the Problems]
To achieve the above object, an arc welding apparatus according to the present invention includes a welding current setting unit and a welding voltage setting unit, and connects a variable terminal of a first variable resistor to the welding current setting unit, A variable terminal of the second variable resistor is connected to the welding voltage setting section, and a rotation axis of the first variable resistor and a rotation axis of the second variable resistor are linked to each other to form a second variable resistor. The fixed terminal of the third variable resistor is connected to one of the fixed terminals, the variable terminal of the third variable resistor is connected to one of its own fixed terminals, and the other of the second variable resistor The fixed terminal of the fourth variable resistor is connected to the fixed terminal of the third variable resistor, and the variable terminal of the fourth variable resistor is connected to one of its fixed terminals. The rotation axis of the fourth variable resistor is interlocked with the second variable resistor and the third variable resistor. When the resistance value between the second variable resistor and the third variable resistor increases, the resistance value between the second variable resistor and the fourth variable resistor decreases. When the resistance value between the second variable resistor and the fourth variable resistor decreases, the resistance value between the second variable resistor and the fourth variable resistor increases.
[0012]
[Action]
With this configuration, when the first variable resistor for adjusting the welding current is rotated, the second variable resistor for adjusting the welding voltage is rotated, and the welding voltage is simultaneously changed.
[0013]
Further, when the third variable resistor and the fourth variable resistor having an interlocking rotation axis respectively connected to the two fixed terminals of the second variable resistor are rotated, the second variable resistor is rotated by the second variable resistor. Since the set welding voltage value changes up and down, fine adjustment of the welding voltage is possible.
[0014]
【Example】
Hereinafter, an arc welding apparatus according to an embodiment of the present invention will be described with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.
[0015]
FIG. 1 is a schematic configuration diagram of an arc welding apparatus according to one embodiment of the present invention. In FIG. 1, 1 is a first variable resistor for adjusting a welding current, 2 is a second variable resistor for adjusting a welding voltage, and 3 and 4 are third variable low-profile devices for finely adjusting a welding voltage. And a fourth variable resistor, 5 is a welding current setting unit, and 6 is a welding voltage setting unit. Reference numeral 11 denotes a remote control unit, which includes variable resistors 1, 2, 3, and 4. Reference numeral 12 denotes a welding power supply unit, which has the welding current setting unit 5 and the welding voltage setting unit 6 built therein.
[0016]
The first variable resistor 1 and the second variable resistor 2, and the third variable resistor 3 and the fourth variable resistor 4 are dual variable resistors each having the same rotation axis.
[0017]
The fixed terminals of a third variable resistor 3 and a fourth variable resistor 4 are connected to the two fixed terminals of the second variable resistor 2, respectively. The variable terminals of the first variable resistor 1 are The variable current terminal of the second variable resistor 2 is connected to the welding current setting unit 5 and the welding voltage setting unit 6.
[0018]
The variable terminals of the third variable resistor 3 and the fourth variable resistor 4 are connected to one ends of fixed terminals of the respective variable resistors, and the second variable resistor, the third variable resistor, Is higher, the resistance between the second variable resistor and the fourth variable resistor is lower, and the resistance between the second variable resistor and the third variable resistor is lower. When the resistance value decreases, the low cultivated land between the second variable resistor and the fourth variable resistor increases.
[0019]
In the above configuration, when the first variable resistor 1 for adjusting the welding current of the remote control unit 12 is rotated, the second variable resistor 2 for adjusting the welding voltage is the same as the first variable resistor 1. Since it is provided on the shaft, the welding voltage can be adjusted at the same time. That is, when the welding current is increased, the welding voltage is increased, and when the welding current is decreased, the welding current is decreased. In this embodiment, when the welding current is increased, the welding voltage increases linearly.
[0020]
When the third variable resistor 3 and the fourth variable resistor 4 connected to the fixed terminal of the second variable resistor 2 and having the same rotation axis are rotated, the second variable resistor 2 is rotated. The potential of the variable terminal also changes by sliding up and down, and the input signal applied to the welding voltage setting unit 6 changes slightly, so that the welding voltage can be finely adjusted.
[0021]
【The invention's effect】
According to the present invention, since the unified adjustment of the welding conditions is made possible with a simple configuration using only a variable resistor, it is resistant to external noise. Further, there is an advantage that a protection circuit is not required for noise and the manufacturing cost of the arc welding apparatus can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an arc welding apparatus according to an embodiment of the present invention. FIG. 2 is a schematic configuration diagram of a conventional arc welding apparatus.
REFERENCE SIGNS LIST 1 first variable resistor 2 second variable resistor 3 third variable resistor 4 fourth variable resistor 5 welding current setting unit 6 welding voltage setting unit 7 welding current adjustment variable resistor 8 welding voltage fine Variable resistor for adjustment 9 Microcomputer 10 ROM containing unified welding condition data table
11 welding power supply unit 12 remote control unit

Claims (2)

Comprising a welding current setting unit, and a welding voltage setting unit, a variable terminal of the first variable resistor connected to the welding current setting unit, connected to the welding voltage setting unit variable terminal of the second variable resistor The rotation axis of the first variable resistor and the rotation axis of the second variable resistor are linked, and the fixed terminal of the third variable resistor is connected to one fixed terminal of the second variable resistor. At the same time, the variable terminal of the third variable resistor is connected to one of its own fixed terminals, and the fixed terminal of the fourth variable resistor is connected to the other fixed terminal of the second variable resistor. In addition, the variable terminal of the fourth variable resistor is connected to one of its own fixed terminals, and the rotation axis of the third variable resistor and the rotation axis of the fourth variable resistor are linked, When the resistance value between the second variable resistor and the third variable resistor increases, the second variable resistor When the resistance between the variable resistor and the fourth variable resistor decreases and the resistance between the second variable resistor and the third variable resistor decreases, An arc welding apparatus in which the resistance value between the variable resistor according to (1) and the fourth variable resistor is increased. 2. The arc welding apparatus according to claim 1, wherein the welding voltage is high when the welding current is high, and the welding voltage is low when the welding current is low.

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