JPH05200547A - Arc welding power unit - Google Patents

Abstract

PURPOSE:To provide the arc welding power unit capable of knowing an output value during welding output by a welding operator after welding work is completed. CONSTITUTION:A current detection part 1 detects an output current value by using a shunt 7 and a voltage detection part 2 detects an output voltage value from between 8a and 8b. An arithmetic unit part 3 receives signals from the current detection part 1 and the voltage detection part 2, averages and calculates welding output current and voltage values in the real time during the time from starting till completion of a starting signal TS and outputs output current and voltage average values at the preset time till the specified time from after starting signal completion. A signal from the arithmetic unit part 3 continues to display a welding current average value and a welding voltage average value for the specified time even after welding completion by a display element part 5 via a display driving part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding power source device used for arc welding.

[0002]

2. Description of the Related Art A conventional arc welding power supply device is provided with a meter for displaying an output current value and an output voltage value. When the arc welding work is completed, the meter display shows the value at the end of the arc welding. Is displayed.

Therefore, a welding operator attaches a measuring instrument for recording an output value from time to time to the arc welding power supply device, and confirms the output value of the arc welding performed from the recording of the measuring instrument after the welding operation.

[0004]

In the conventional arc welding power supply device, the output current value and voltage value were displayed by an analog meter or the like only during the welding output period. In many cases, it is difficult to see the meters of the welding power source at the same time, and it is very difficult for an unskilled person to set the output value because the relationship between the output arc state and the current or voltage cannot be accurately known.

It is an object of the present invention to provide an arc welding power supply device capable of knowing the relationship between the output arc state and the current and voltage after the end of welding output without using a measuring instrument for recording the output value during welding. And

[0006]

An arc welding power supply device of the present invention is a current detection unit for detecting a welding output current, a voltage detection unit for detecting a welding output voltage, and a current value output from the current detection unit. The signal and the voltage value signal output from the voltage detection unit are input, and the welding output current value and the voltage value are averaged in real time from the start to the end of the welding output start signal, and after the welding output start signal ends. From the predetermined time to the output current value at a preset time, the arithmetic mean unit for outputting the voltage average value as the current average value signal and the voltage average value signal, and the current average value signal and the voltage average value signal A display driving unit for inputting and converting to a signal for external display and outputting, and a display element unit for displaying a welding current average value and a welding voltage average value by a drive signal from the display driving unit are provided. Do

[0007]

According to this structure, the arithmetic unit averages the current value and the voltage value at the time of welding output and continues to output the average value for a predetermined time even after the welding is completed. From the output average value, the arc state of the performed welding can be confirmed, the welding output can be easily set, the work efficiency can be improved, and the output value can be controlled, so that the welding quality can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. The arc welding power supply device of the present invention is configured as shown in FIG. 1 is a current detector, 2 is a voltage detector, 3 is an arithmetic unit, 4 is a display driver, 5 is a display element, 6 is a main output circuit, 7 is a shunt, and 8a and 8b are output terminals. ..

The current detection unit 1 detects the welding current value currently output by using the shunt 7 placed between the main output circuit unit 6 and the output terminal 8b, and performs A / D conversion to perform the A / D conversion. Output as signal Ia.

The voltage detector 2 detects the voltage value between the output terminals 8a and 8b, performs A / D conversion, and outputs a voltage value signal V.
Output as a. The arithmetic unit 3 performs an averaging process on the current value signal Ia and the voltage value signal Va while receiving the activation signal TS, and averages Ia to obtain a current average value signal “I”.
ave ”and Va average voltage value signal“ Va ”
ve ”is output in real time. The average value is calculated as
The average value per unit time is calculated using a microprocessor or the like. The start signal TS turns off and the current value signal I
From the time when the value of a becomes zero to the preset time T1, the current average value signal "Iav" after a predetermined time TO after welding output is performed by the start signal TS
e "and voltage average value signal" Vave "are output and held. Times TO and T1 can be freely set and changed on a program. These can be easily realized by using a microprocessor or the like.

The display drive section 4 uses the current average value signal "Iav".
e ”, the voltage average value signal“ Vave ”is received, and the drive signal SD for displaying the current value and the voltage value is output.
Displays a current value and a voltage value in response to the drive signal SD, and can be easily realized by using a segment light emitting diode display or a liquid crystal display.

2A to 2C show display time charts. The display of the current value will be described as an example. The welding output is started by turning on the start signal TS, and at the same time, the average current value is displayed on the display element. The output current value is displayed on the display element unit 5 in real time as long as the activation signal TS is on. At this time, every time TO time has elapsed from the time when the activation signal TS was turned on, the current average value “I
The arithmetic unit 3 repeatedly updates and stores "aveO". The welding output is stopped by turning off the start signal TS, and the stored current average value "IaveO" is displayed until a predetermined time T1. It is displayed on the part 5, and the output value can be easily known even after the welding output is completed.

The arithmetic unit 3 is constructed as shown in FIG. Reference numeral 31 is an arithmetic processing unit, 32 is a storage unit, 33 is a clock counter unit, 34a and 34b are analog / digital conversion units, 35 is a TO time setting device, and 36 is a T1 time setting device.

The arithmetic processing unit 31 cumulatively adds each of the current value signal Ia and the voltage value signal Va a fixed number of times, divides the sum by the number of times value to obtain an average value, and whether the activation signal TS is in the ON state. If the current value signal Ia is not zero, the average value is directly output as the current average value signal “Iave” and the voltage average value signal “Vave”. The values set by the TO time setter 35 and the T1 time setter 36 are digitally converted via the analog / digital converters 34a and 34b and read into the arithmetic processing unit 31 as TO set time and T1 set time. When the activation signal TS is turned on, the clock counter unit 33 starts counting, and the current average value and voltage average value when the TO value and the count value match are stored in the storage unit 32. Further, when the activation signal TS is turned off, the clock counter section 33 starts counting, and when the activation signal TS is turned off and the current value signal Ia becomes zero, the current average value and the voltage average value stored in the storage section 32 are stored. The current average value signal “Iave” and the voltage average value signal “Vave” are T1.
Output until the value and the count value match.

The arithmetic processing section 31 is a microprocessor, the storage section 32 is a volatile memory element, and the clock counter section 3 is provided.
3 is a counter integrated circuit and an analog / digital converter 34
a and 34b are A / D conversion integrated circuits and TO time setting device 35
The T1 time setter 36 can be easily realized by a variable resistor or the like.

[0016]

As described above, according to the present invention, a current detecting section for detecting a welding output current, a voltage detecting section for detecting a welding output voltage, a current value signal output from the current detecting section and the voltage. Using the voltage value signal output from the detector as an input, the welding output current value and voltage value are averaged and calculated in real time from the start to the end of the welding output start signal, and a predetermined time has elapsed after the welding output start signal ended. Up to the output current value and the voltage average value at a preset time, the arithmetic unit for outputting the current average value signal and the voltage average value signal and outputting the current average value signal and the voltage average value signal A display drive unit that converts and outputs the signal for display and a display element unit that displays the welding current average value and the welding voltage average value by the drive signal from the display drive unit are provided. of A force current and voltage after welding output ends can be displayed easily output the arc condition and the current,
It becomes possible for the welding operator to know the relationship of the voltage, the welding quality can be improved, and even an unskilled operator can easily control the output.

[Brief description of drawings]

FIG. 1 is a block diagram showing an arc welding power supply device of the present invention.

FIG. 2 is a timing diagram showing a display state of the device.

FIG. 3 is a block diagram showing details of an arithmetic unit of the same apparatus.

[Explanation of symbols]

 1 current detection unit 2 voltage detection unit 3 arithmetic unit unit 4 display drive unit 5 display element unit TS drive signal

Claims (1)

[Claims] 1. A current detector for detecting a welding output current,
A voltage detection unit for detecting a welding output voltage, a current value signal output from the current detection unit and a voltage value signal output from the voltage detection unit as inputs, and from the start to the end of the welding output start signal The welding output current value and voltage value are averaged and calculated in real time, and the output current value and voltage average value at the preset time from the end of the welding output start signal to the predetermined time are the current average value signal and voltage average value. Welding with a computing unit that outputs as a signal, a display drive unit that inputs a current average value signal and a voltage average value signal and converts them to a signal for external display and outputs, and a drive signal from the display drive unit An arc welding power supply device provided with a display element section for displaying an average current value and an average welding voltage value.