JPS61245971A - Control method for automatic arc welding machine - Google Patents

Abstract

PURPOSE:To control so as to perform the complete automatic control of an automatic arc welding machine by automatically correcting so as to make the initial welding conditions set quantity prior to the welding start a welding indication value and by storing the latest operation of the correction quantity at the welding completion time. CONSTITUTION:The aiming welding current and voltage values and welding speed are inputted to a welding conditions indicator 1 and said each indication value is given to a welding conditions setter 2. The welding current and voltage set quantity retrieved by the setter 2 based on each indication value and welding speed set quantity are given respectively to a welding current and voltage controller 3 and welding speed controller 4 from the setter 2 in succession. The welding is then performed by controlling via each controller 3, 4 based on said each set quantity by the automatic arc welding machine. The each measured value of the welding current and voltage and welding speed measured by a welding conditions measuring instrument 13 is operated by a mean value computing element 14 as the mean value. The mean value of said each measured value is compared with said each indication value by a set value correction quantity computing element 15 and the welding is performed then by operating the correction quantity on each the prescribed time against said each set quantity based on said difference.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method of controlling an automatic arc welding machine.

"Conventional technology" Welding conditions such as welding current, welding voltage, and welding speed in an automatic arc welding machine must be set to values that ensure the necessary amount of welding at the welded part of the base metal and do not cause welding defects. be.

In particular, when welding seam edges during the manufacture of UO steel pipes, where quality control of welded parts is strictly required, the welding conditions should be set correctly and the welding current voltage and welding speed of the automatic arc welding machine should be set appropriately. is required.

Now, conventionally, as shown in Fig. 2, in the conventional control method of an automatic arc welding machine, the operator inputs the welding condition indicator l based on the specifications such as the material, plate thickness, and groove shape of the base material S to be welded. , input the target welding current voltage value and welding speed.

The respective target instruction values are given from the welding condition indicator 1 to the welding condition setter 2, and the welding current voltage setting amount and welding speed setting amount are retrieved in the welding condition setting device 2 based on each target instruction value. The retrieved welding current voltage setting amount and welding speed setting amount are given from the welding condition setting device 2 to the welding current voltage controller 3 and welding speed controller 4, respectively.

Next, by closing the welding start switch, a welding current voltage corresponding to the welding current voltage setting amount is supplied from the welding current voltage controller 3 between the welding wire 6 and the base material S via the power supply tip 5, and A voltage corresponding to the welding speed setting amount is supplied from the welding speed controller 4 to the traveling motor 8 of the welding cart 7, and welding to the base material S is performed.

The welding current voltage and welding speed during welding are monitored by the operator by an ammeter 9, a voltmeter 10 and a speed meter 12 via a speed detector 11.
0, the welding condition setting S based on the displayed value of the speedometer 12
Each setting amount in 2 is changed.

``Problems to be Solved by the Invention'' By the way, in the conventional automatic arc welding machine control method, the operator must monitor the welding current voltage and welding speed during welding using respective meters. This is because the operator must manually change the initial welding condition settings before welding starts each time, based on the respective display values of the welding current needle, welding voltmeter, and welding speed needle during welding. , it is very troublesome and time consuming, and there are problems that it cannot be said to be a completely automatic control of an automatic arc welding machine.

Moreover, when there are many welding condition setting items, such as in a high-efficiency multi-electrode arc welding machine, the operator can set the welding condition settings for each electrode based on the displayed value of each meter during welding. Since changes must be made manually each time, it takes more time to complete changing all the welding condition settings, and there is a risk that welding defects may occur during this change.

In addition, when monitoring welding conditions using a meter during welding and changing the welding condition set amount based on the value displayed on the meter, the operator may misread the value displayed on the meter or there may be a defect in the meter itself. There is a possibility that the welding condition values may be changed to incorrect values, which poses a problem in terms of quality assurance of the welded part.

"Means for Solving the Problems" The present invention is intended to solve the problems of the conventional automatic arc welding machine control method as described above, and its gist is that the y8tfj condition indicator Automatic arc welding is performed via the welding current voltage controller and welding speed controller based on the welding current voltage setting amount and welding speed setting amount searched in the welding condition setting device based on the welding current voltage controller and welding speed instruction value from The machine is controlled to perform welding, and based on the difference between the average value of each measured value of welding current voltage and welding speed during this welding per predetermined time and each of the above-mentioned indicated values, welding is performed at each predetermined time for each of the above-mentioned set values. The automatic arc welding machine is controlled by correcting each set amount in the welding condition setting device using the calculated correction value, and the calculated value of each correction amount at the end of welding is used for the next time. The method of controlling an automatic arc welding machine is such that the memory is stored for correction during subsequent welding under the same conditions.

The method of the present invention will be explained below based on FIG.

As shown in FIG. 1, a target welding current voltage value and welding speed are input into the welding condition indicator 1.

The respective instruction values are given from the welding condition indicator 1 to the welding condition setter 2, and the welding current voltage setting amount and welding speed setting amount are searched in the welding condition setting device 2 based on each instruction value, The retrieved welding current voltage setting amount and welding speed setting amount are given from the welding condition setting device 2 to the welding current voltage controller 3 and welding speed controller 4, respectively.

The automatic arc welding machine performs welding under control via the respective controllers 3 and 4 based on the respective set amounts.

On the other hand, the welding current voltage and welding speed during welding are
It is displayed by an ammeter 9, a voltmeter 10, and a speed meter 12, and is also measured by a welding condition measuring device 13.

The measured values of welding current voltage and welding speed measured by this measuring device 13 are calculated by an average value calculator 14 as an average value per predetermined time.

The average value of each measured value is compared with each of the instruction values in a set value correction amount calculator 15, and based on the difference, a correction amount for each set value is calculated for each predetermined time.

This correction amount calculation value is inputted to the welding condition setting device 2 for correction of each setting amount via the welding end determination device 16 while welding is continuing, and each setting amount is corrected. Welding is done.゛Also, the end of welding is determined by the welding end determiner 16, and the latest correction amount calculation value at the end of welding is stored in the memory 17 via the welding end determiner 16 as a correction for the next time welding under the same conditions. Let me remember it.

"Effects of the Invention" As described above, according to the method of the present invention, the initial welding condition setting amount before welding can be automatically corrected to the welding condition instruction value, so that automatic arc welding Fully automatic control can be achieved, and it can significantly contribute to improving the quality of welded parts.

Moreover, since the latest correction amount calculation value at the end of welding is stored, the welding condition setting amount for subsequent welding under the same conditions can be set as the welding condition instruction value from the beginning before welding is started.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the structure of the method of the present invention, and FIG. 2 is a block diagram showing an example of the structure of the conventional method. l... Welding condition indicator, 2... Welding condition setting device, 3
... Welding current voltage controller, 4... Welding speed controller,
5... Power supply chip, 6... Welding wire, 7...
Welding cart, 8... Traveling motor, 9... Current needle,
IO... Voltage needle, 11... Speed detector, 12...
Speed needle, 13...Welding condition measuring device, 14...Average value calculator, 15...Set value correction amount calculator, 16...Welding end determination device, 17...Memory device Fig. 1 Figure 2

Claims (1)

[Claims] The welding current voltage controller and welding speed controller are controlled by the welding current voltage setting amount and welding speed setting amount searched in the welding condition setting device based on the welding current voltage instruction value and welding speed instruction value from the welding condition indicator. Welding is performed by controlling an automatic arc welding machine through the welding process, and each set amount is calculated based on the difference between the average value of each measured value of welding current voltage and welding speed during welding, and each of the above indicated values. A correction amount is calculated for each predetermined time period, and the automatic arc welding machine is controlled by correcting each setting amount in the welding condition setting device using this correction amount calculation value, and each correction amount calculation at the end of welding is performed. A method for controlling an automatic arc welding machine, characterized in that the value is stored for correction during subsequent welding under the same conditions.