JPH05261538A - Device for monitoring arc welding machine - Google Patents

Abstract

PURPOSE:To improve the maintenance and control of the welding quality by clarifying optimum values of a current, the voltage, etc., at the time of welding and the upper and lower limits of the limiter. CONSTITUTION:A command value setting device 14 to set and output a command value which is a reference value of welding conditions and a limiter upper and lower limit width regulator 11 to set and output regulation values of the limiter upper and lower limits for the command value are provided. In a CPU circuit 13, a limiter upper value and a limiter lower limit value are calculated from the command value and the regulation values and it is determined as to whether or not the welding conditions such as the current and voltage values at the time of welding are within the range of limiter setting conditions. The deviation from the optimum value is then clarified and the welding quality is controlled by a proportion value. In addition, since the limiter upper and lower limits are automatically set by the command value, the change of the welding condition can easily be followed and the welding quality can easily be maintained and controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc welding machine monitor for monitoring welding conditions during arc welding.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing the configuration of a limiter function section in a conventional arc welding machine monitor.
In FIG. 5, the limiter upper limit adjuster 1, the limiter lower limit adjuster 2, and the detection circuit 3 are connected to the CP via the A / D converter 4.
The limiter signal connected to the U circuit 5 and set by the limiter upper limit adjuster 1 and the limiter lower limit adjuster 2 and the signal detected by the detection circuit 3 are A / D converted via the A / D converter 4. Input to the CPU circuit 5. In the limiter upper limit adjuster 1 and the limiter lower limit adjuster 2, the upper limit value a and the lower limit value b of the limiter are set as shown in FIG. Then, the CPU circuit 5 determines whether or not the detection signal is within the set limiter signal range, and when it is out of the range, that is, when the detection signal exceeds the limiter upper limit value a, the upper limit limiter warning signal. A
Is output, and when the detection signal falls below the limiter lower limit value b, the lower limit limiter warning signal B is output. Using the upper limit limiter warning signal A and the lower limit limiter warning signal B, a lamp is turned on or a buzzer is sounded to notify an operator or a manager.

[0003]

However, in the above conventional structure, the optimum values such as welding current and welding voltage as the welding conditions and the upper and lower limits of the limiter are not clear.
That is, for example, when the optimum welding current value is 200 A, the limiter upper limit value is 220 A and the limiter lower limit value is 190 A.
If it is set to, the worker will work between 190 A and 220 A, but it is not easy to know that the optimum welding current value is 200 A, and the worker, for example, would be 190 A to 220 A.
It is possible to continue welding at an intermediate value of 205 A. Also, the limiter upper and lower limits must be set every time the welding conditions change, and the optimal values such as welding current and welding voltage and the limiter upper and lower limits are unclear, so the limiter upper and lower limits cannot be set. Be clear. As a result, there is a problem that the maintenance and control of the welding quality, which is the purpose of the arc welding machine monitor, becomes insufficient.

The present invention solves the above-mentioned conventional problems, and provides an arc welding machine monitor capable of improving the control of welding quality by clarifying the optimum value of welding conditions and the upper and lower limits of the limiter. The purpose is.

[0005]

In order to solve the above problems, an arc welding machine monitoring device of the present invention is an arc welding machine monitoring device for monitoring welding conditions during arc welding, and a reference value of the welding conditions. Command value setting means for setting and outputting a command value, limiter upper / lower limit width adjusting means for setting and outputting a limiter upper / lower limit adjustment value for the command value, and a detection value for the welding condition. A detection unit, and a calculation comparison unit that calculates a limiter upper limit value and a limiter lower limit value from the command value and the adjustment value, and outputs a warning signal when the detected value deviates from the limiter upper limit value or the limiter lower limit value. It is a thing.

Further, the limiter upper / lower limit width adjusting means in the arc welding machine monitoring device of the present invention is configured so that adjustment values for the limiter upper / lower limits can be independently set.

[0007]

With the above structure, the command value setting means sets and clarifies the optimum values of welding conditions such as welding current and voltage as command values, and the limiter upper and lower limit width adjusting means adjusts the limiter upper and lower limits. Since the value is clarified, the deviation from the optimum value is clarified, and the adjustment value facilitates the control of the welding quality. Further, since the limiter upper and lower limit values are automatically set by the command value, it is possible to easily follow changes in welding conditions.For example, if the limiter upper and lower limit widths are the same, simply set the command value as the reference value. The limiter upper and lower limits are set automatically, which makes it easy to maintain and control the welding quality. Furthermore, since the ratio values for the upper and lower limits of the limiter can be set independently, the degree of freedom in adjusting the width of the upper and lower limits of the limiter is expanded.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a limiter function unit in an arc welding machine monitor apparatus according to a first embodiment of the present invention. In FIG. 1, a limiter upper / lower limit width adjuster 11 that outputs a ratio value as an adjustment value for the limiter upper / lower limit is connected to a CPU circuit 13 via an A / D converter 12, and the limiter upper / lower limit width adjuster 11 After the A / D conversion of the ratio value is input to the CPU circuit 13. In addition, a command value setter 14 that sets and outputs a command value that is the reference value of welding conditions
Is connected to the CPU circuit 13 via the A / D converter 12, and after A / D converting the command value from the command value setter 14, the CPU
Input to circuit 13. The detection circuit 15 that outputs the detected value of the welding condition is connected to the CPU circuit 13 through the A / D converter 12, and after the detected value from the detection circuit 15 is A / D converted, the CP
Input to U circuit 13. CPU circuit as arithmetic comparison means
At 13, the limiter upper limit value and the limiter lower limit value are calculated from the command value and the adjustment value, and when the detected value deviates from the limiter upper limit value or the limiter lower limit value, the upper limit limiter warning signal A or the lower limit limiter warning signal B is output.

The operation of the above arrangement will be described below. 2 is a command value which is a reference value output from the command value setting device 14, D is a ratio value D to the command value S output from the limiter upper / lower limit width adjusting device 11, and , A are difference values with respect to the command value S.

First, the command value S output from the command value setter 14 and the ratio value D output from the limiter upper / lower limit width adjuster 11 are input to the CPU circuit 13 via the A / D converter 12. .. In this CPU circuit 13, the command value S and the ratio value D are converted into the difference value a. The conversion formula is the difference value a = S × D.
It is / 100. Then, the command value S and the difference value a are added to make the limiter upper limit value S + a, and the command value S and the difference value a are subtracted to make the limiter lower limit value Sa. Next, the detection value of the welding conditions output from the detection circuit 15 and the limiter upper limit value S + a
If the detected value exceeds the limit value, the limiter upper limit warning signal A is output. Further, the detected value is compared with the limiter lower limit value Sa, and if the detected value is lower than the limiter lower limit value Sa, the limiter lower limit warning signal B is output.

Therefore, a command value setter 14 that sets and outputs a command value that is a reference value of welding conditions, and a limiter upper and lower limit width adjuster 11 that sets and outputs an adjustment value for the limiter upper and lower limits of the command value. The CPU circuit 13 calculates the limiter upper limit value and the limiter lower limit value from the command value and the adjustment value, and determines whether the welding conditions such as current and voltage value during welding are within the limiter setting conditions. So
The deviation from the optimum value becomes clear, and the welding quality can be easily controlled by the ratio value. Further, since the limiter upper and lower limits are automatically set according to the command value, it is possible to easily follow changes in welding conditions and easily and sufficiently maintain and manage the welding quality.

FIG. 3 is a block diagram showing the configuration of the limiter function part in the arc welding machine monitor of the second embodiment of the present invention. In FIG. 3, the limiter upper limit width adjuster 2
1, the limiter lower limit width adjuster 22, the command value setter 23 and the detection circuit 24 are connected to the CPU circuit 26 via the A / D converter 25, and the limiter upper limit width adjuster 21 adjusts the limiter upper limit value, And when the limiter upper limit value and the limiter lower limit value are calculated from the adjustment value for the limiter lower limit value from the limiter lower limit width adjuster 22 and the detected value of the welding condition from the detection circuit 24 deviates from the limiter upper limit value or the limiter lower limit value, The upper limit limiter warning signal A or the lower limit limiter warning signal B is output.

The operation of the above arrangement will be described below. S shown in FIG. 4 is a command value output from the command value setting unit 23, D1 is a ratio value output from the limiter upper limit width adjuster 21, and D2 is a ratio value output from the limiter lower limit adjuster 22. And a is an upper limit difference value with respect to the command value S, and b is a lower limit difference value with respect to the command value S.

First, the command value S output from the command value setter 23, the ratio value D1 output from the limiter upper limit width adjuster 21 and the ratio value D2 output from the limiter lower limit width adjuster 22 are set to A Input to the CPU circuit 26 via the / D converter 25. The CPU circuit 26 converts the ratio value D1 and the ratio value D2 into difference values a and b, respectively. The conversion formula is as follows: difference value a = S × D1 / 100, difference value b = S × D2 /
It is 100. Then, the command value S and the difference value a are added to make the limiter upper limit value S + a, and the command value S and the difference value b are subtracted to make the limiter lower limit value S-b. Next, the detection value output from the detection circuit 24 is compared with the limiter upper limit value S + a, and if the detection value is higher, the limiter upper limit warning signal A is output. Further, the detected value is compared with the limiter lower limit value Sa, and if the detected value is lower than the limiter lower limit value Sa, the limiter lower limit warning signal B is output.

Therefore, the limiter upper limit width adjuster 21 and the limiter lower limit width adjuster 22 can independently set the ratio values for the limiter upper and lower limits, so that the degree of freedom in adjusting the limiter upper and lower limits can be expanded.

[0016]

As described above, according to the present invention, the optimum values of welding conditions such as current and voltage at the time of welding and the upper and lower limits of the limiter can be clarified by using designated values and adjustment values, and the welding quality can be controlled. It is possible to improve. Further, the limiter upper and lower limit values are automatically set with respect to the command value, so that it is possible to easily follow changes in welding conditions, and it is possible to favorably maintain and control the welding quality. Furthermore, since the adjustment values for the upper and lower limits of the limiter can be set independently, the degree of freedom in adjusting the width of the upper and lower limits of the limiter can be expanded.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a limiter function unit in an arc welder monitor device according to a first embodiment of the present invention.

FIG. 2 is a limiter upper / lower limit value setting diagram for the arc welder monitor device of FIG.

FIG. 3 is a block diagram showing a configuration of a limiter function unit in the arc welding machine monitoring apparatus according to the second embodiment of the present invention.

FIG. 4 is a limiter upper / lower limit value setting diagram for the arc welder monitor device of FIG. 3;

FIG. 5 is a block diagram showing a configuration of a limiter function unit in a conventional arc welder monitor device.

FIG. 6 is a limiter upper / lower limit value setting diagram for the arc welder monitor device of FIG. 5;

[Explanation of symbols]

 11 Limiter upper / lower limit width adjuster 12, 23 Command value setter 13, 24 Detection circuit 14, 25 A / D converter 15, 26 CPU circuit 21 Limiter upper limit width adjuster 22 Limiter lower limit width adjuster

Claims (2)

[Claims] 1. An arc welding machine monitoring device for monitoring welding conditions during arc welding, comprising command value setting means for setting and outputting a command value which is a reference value of the welding condition, and a limiter for the command value. Limiter upper and lower limit width adjusting means for setting and outputting adjustment values for upper and lower limits, detecting means for outputting the detected value of the welding condition, and calculating the limiter upper limit value and the limiter lower limit value from the command value and the adjustment value. An arc welding machine monitoring device comprising: an arithmetic comparison unit that outputs a warning signal when the detected value deviates from the limiter upper limit value or the limiter lower limit value. 2. The limiter upper / lower limit width adjusting means is configured so that adjustment values for the limiter upper / lower limits can be independently set.
Arc welding machine monitor device described.