JPS6064766A - Control device for arc welding - Google Patents

Abstract

PURPOSE:To provide a titled control device which selects the same or approximately adequate welding conditions with a storage device and performs welding in control for one-dimensionally adjusted arc welding which determines the other with respect to either one of welding current set value or voltage set value, by inputting the one set value. CONSTITUTION:When, for example, an identification number for the past satisfactory welding conditions is put into a switching means and a welding voltage set value 16 is put therein, a storage reproduction control part 14 actuates an approximate welding conditions operation part 12 and an approximate welding conditions storage part 13 and displays 152 the conditions. A welding power source 1 and a motor control part 2 are actuated at the same instant at the reproduction control part 14 and welding is accomplished at satisfactory detected current 8 and detected voltage 9. Said voltage 9 and current 8 are registered together with the identification number into the storage part 13 in the case of storing the satisfactory conditions. The welding operation is immediately started if the material of a wire, gaseous components, the operator, etc. are attached with identification numbers and are preliminarily stored in the recording part 13 except the welding voltage and current.

Description

[Detailed Description of the Invention] Technical Field The present invention provides a centrally adjustable arc welding system in which, in arc welding, if only one of the welding current and welding voltage is set, the other condition is automatically determined in accordance with the other condition. This relates to a control device.

Welding current and m are important welding conditions in conventional arc welding.
It is known that there exists a relationship between the contact voltage and the contact voltage, which provides an optimal combination if other conditions such as the material of the M finger electrode to be used and the type of shielding gas are determined. Normally, these conditions are such that when a welding power source with constant voltage characteristics is used, the consumable electrode wire is fed at a constant speed, the welding current is determined by the feeding speed of the consumable electrode wire, and the welding voltage is determined by the power source output. Furthermore, when using a welding power source with constant current characteristics or drooping characteristics, the welding voltage is controlled by varying the feeding speed of the consumable electrode Wahiya depending on the welding voltage, and the welding current is determined by the output of the welding power source. As a more special example, a power supply with constant current characteristics or drooping characteristics is used, and the consumable electrode wire is fed at a constant speed, and the welding voltage is determined by the feeding speed of the consumable electrode wire. There is also a method that determines by output. Also, T using non-consumable electrodes
In IG welding, a welding power source with constant current characteristics or drooping characteristics is used, the welding current is determined by the output of the welding power source, and the welding voltage is determined by controlling the distance between the electrode and the workpiece, that is, the arc length. In any of these cases, the optimal combination of welding voltage and welding current is determined by determining the output current, for example, the feeding speed of the consumable electrode wire, by a set value, and by multiplying this set value by a specific number of threads. A centrally adjustable arc welding device has been proposed in which a welding voltage setting signal corresponding to a current setting value is obtained to control the welding voltage, for example, the output voltage of a welding power source.

Conventionally, the combination of welding current and welding voltage is fixed at a value determined at the time of manufacturing the welding device.

On the other hand, the actual optimum value of these combinations is not necessarily constant, and may change when the surrounding conditions such as the material of the consumable electrode wire used, the composition of the shielding scum, or the welding posture change, or when these conditions change. Even when the various conditions of welding do not change, if the arc length or the length of the wire protruding from the welding torch changes due to the habits of the worker or changes in the amount of excess welding, the combination of optimal values will change within a considerable range. be. For this reason, at actual welding sites, it is often necessary to set welding conditions to a different combination of welding current and welding voltage than the combination set on the device. shall be invalidated by
Therefore, it is necessary to adjust the welding current and welding voltage independently to suit each case.In reality, the unified adjustment function of this conventional method is rarely used, and these functions are not used. This was a serious drawback of conventional equipment.

SUMMARY OF THE INVENTION The present invention captures and stores a combination of welding current and welding voltage that is considered to be the optimum condition recognized at an actual welding site each time, and then selects a combination of welding current and welding voltage that is designated as bath welding current or welding voltage. In some cases, a control device is used that extracts values calculated by calculation from previously stored data, determines a combination of output settings, and performs bathing, thereby obtaining a unified adjustment function suitable for each usage condition. This is what we provide.

Embodiment FIG. 1 is a connection diagram showing an embodiment of the arc welding control device of the present invention. The figure shows the case in which the present invention is implemented in a unified system in which the welding current is controlled by the feeding speed of the consumable electrode wire, and the output voltage of the bath power source is controlled using the set value of this welding current. This is an example. In the figure, reference numeral 1 denotes a t6 connection power source, and in the embodiment shown in the figure, a power source with substantially constant voltage characteristics whose output voltage is adjustable is used. 2 is a motor control unit for controlling the feeding speed of the consumable electrode wire 7 (hereinafter simply referred to as wire), and a welding current setting unit 3
The rotational speed of the electric motor 4 is controlled according to the output. Reference numeral 5 denotes a wire feeding roll connected to the electric motor 4, 6 is a workpiece to be welded, and the output of the welding power source 1 is supplied to the wire 7 and the workpiece 6. Reference numeral 8 denotes a welding current detection section which detects the welding current using a shunt resistor, a DC rhombus current device, etc., and detects the average value of the welding current through a suitable low-pass circuit, low-pass filter, etc. A welding voltage detection section 9 detects the voltage between the wire 7 and the workpiece 6 and obtains an averaged output like the current detection section 8. 11
are the optimum welding voltage Va and welding current 1a by test welding.
an actual welding condition storage unit that stores the welding current setting value Ir and welding voltage setting value vr when the combination is obtained;
is the combination of two adjacent welding currents and welding voltages (Ir, V
r, Ia.

an approximate welding condition calculating section for calculating approximate welding conditions by calculating these intermediate welding conditions from Va) by linear approximation at an appropriate pitch; 13 is an approximate welding condition storing the output of the approximate welding condition calculating section 12; This is a storage section, and stores the output data of the actual welding condition storage section and the output of the approximate welding condition calculation section 12, which is obtained by calculating data at intermediate positions.

14 transmits the combination data of welding current and welding voltage to the actual welding condition storage section 11 when the actual welding conditions are determined, and also transmits the welding conditions corresponding to the welding current value when the welding current value is specified. This is a storage/reproduction control section that reads out the approximate welding condition storage section 13 from the approximate welding condition storage section 13.

Reference numeral 15 denotes a display section, which inputs the output of the approximate welding condition storage section 13 and the respective outputs of the welding current detection section 8 and the welding voltage detection section 9, and displays the output signals of the approximate welding condition storage section 13 before welding starts. It is equipped with a switching circuit 151 that displays the welding current value Ia and the welding voltage value Va, and switches to display the output of each detection section after welding has started, and a display 152 that displays the results numerically. 16 is a welding voltage setting section for setting the welding voltage independently of the welding current setting section 3;
Reference numeral 17 denotes a switching means that switches between the welding voltage setting signal of the data read from the approximate welding condition storage section 13 and the output of the welding voltage setting section 16 and supplies it to the welding power source 1 as the voltage setting signal vr. 16 transmits the output of the welding voltage setting section 16 to the welding power source only when no data exists in the approximate welding condition storage section 13 according to a command from the storage/reproduction control section 14, and when data already exists, the approximate welding condition storage section The welding conditions from section 13 are switched to be transmitted to welding power source 1, and even when data exists in approximate welding condition storage section 13, the output of welding voltage setting section 16 is added to this as a fine adjustment signal. This means that the information is switched so that the information is transmitted.

Each of these components may be housed in a separate control panel, or may be built into the welding machine body, such as a welding power source.

The operation of the embodiment shown in FIG. 1 will be explained with reference to the explanatory diagram in FIG. First, when there is no data at all in the actual welding condition storage section 11, since no data is stored in the approximate welding condition storage section 13), the switching device 17 transmits the output of the welding voltage setting section 16 to the welding type #j1. Ru. The output voltage and wire feeding speed, that is, the welding current, of the welding power source 1 are determined by the output vr of the welding voltage setting section 16 and the output Ir of the welding current setting section 3. The output V r 1 of the output voltage setting section 16 when the optimum welding result is obtained by adjusting the welding voltage setting section 16 with respect to the output r1 of a certain welding current setting section 3 is determined, and then Actual welding electrician 31.
The welding voltage v is detected by the welding current detection section 8 and the welding voltage detection section 9, and these combinations (■r■rIaX1
Actual welding condition storage section 111''1'1' while welding a)
Store in 1. The timing of this memorization may be determined by a switch operated by a welding operator, for example, a trigger switch of a welding torch. Next, another welding current is set in the setting section 3, the optimum welding voltage is similarly tested by test welding, and the welding condition data at that time is ('r2+vr
2+'a2. v32) in the actual welding condition storage unit 11. When two actual welding condition data are stored in the actual welding condition storage section 11, the approximate welding condition calculation section 12 calculates a welding condition between these two conditions. At this time, the calculation section 12 performs calculations by linear approximation assuming that the two obtained welding conditions change linearly, and outputs the results to the approximate welding condition storage section 13 for storage. Figure 2 (
A) is a diagram for explaining the situation at this time, in which the horizontal axis shows the output I of the output current setting section 3 on the right, and the vertical axis shows the actual welding current Ia.

The left side of the horizontal axis shows the welding voltage determined for this welding current. First, when the condition (D) in FIG. 2(a), that is, Ir, is specified by the welding current setting device 3,
The welding current ■3□ corresponding to this and the welding voltage ■a suitable for this welding current are obtained, and the combination of the set value and the actual value (Ir 11 vr 1 + Ia□) is obtained.

val) is obtained, and then the condition of ■ ("r2.vr2+■
a2+”a2) are obtained and the actual welding conditions storage section 1
It is stored in 1. After this, the approximate m-contact condition calculating unit 12 takes in the actual welding conditions corresponding to these ■ and ■, and all welding conditions between these are connected by straight lines connecting the conditions ■ and ■ as shown in the solid line part of the figure. Linear approximation assuming that it is on the line,
That is, it is calculated by proportional calculation.

Of course, the actual output value of the welding current for the set value of the welding current located between these values varies depending on the output characteristics of the welding machine, and the value of the welding voltage that is the optimal condition for the welding current value is also directly proportional. Although not limited to
As will be described later, these values approach the correct values as the number of actual welding condition data increases, so there is no need to perform particularly difficult curve approximation or function calculations. In addition, the interval between the welding conditions calculated by calculation is determined from the maximum value to the minimum value of the output current of the welding machine main body depending on the capacity of the control unit, storage unit, etc. When configured with an 8-bit system, it can be divided into a maximum of 256 stages, and even with a welding machine with a maximum current of about 500 A, the intervals will be 2 amperes. For practical purposes, sufficient resolution can be obtained.

In this way, after obtaining the actual welding conditions at two points, and after obtaining the welding conditions by linear approximation calculation between them, specifying another bath contact current setting value Ir3 corresponding to the point (■) in the welding current setting section 3. In response, the memory reproducing control unit 14 selects approximate welding conditions (Ir3 + ■r3 + "a3
+va3) and transmits the welding voltage setting value vr3 to the welding power source 1, and at the same time, the welding current value ■a3. The welding voltage value va3 is supplied to the display section 15 and displayed. As a result of welding under these conditions, the actual welding current value was 12L/3 due to the characteristics of welding type #1 and wire feed speed control device 2, and the optimal welding voltage value was finely adjusted to this welding current value. As a result of the correction, it turns out that val is more preferable than va3. Then, as the optimal actual welding condition corresponding to the welding current setting value Ir3, ("r3 +vr'3 r"a'3gi)
is written into the actual welding condition storage section 11. By writing this new actual welding condition, approximate welding condition calculation section 1
2 assumes that there are welding conditions that change linearly between the actual welding conditions of ■ and ■ and between ■ and ■, respectively, and performs a linear approximation calculation, and the solid line in Fig. 2 (b) Obtain the approximate welding conditions in the form of a broken line as shown and store the approximate welding conditions storage section 1.
Update the data in 3. After this, another welding current 1
According to the test welding results when r is specified (Ir4
．． vr4+Ia4g2L4) data is obtained, and these data are updated by calculating the bath tangent conditions between the real l-trough tangent conditions on both sides of the previously stored punch and octopus data by linear approximation calculations.

In this way, the following operations (test bath welding → correction of welding conditions → storage of actual welding condition data – updating of approximate welding condition memory contents) are repeated one after another based on the approximate welding conditions obtained earlier, as shown in Figure 2 ( The approximate welding conditions obtained as shown in C) gradually approach the conditions for a one-way adjustment that corresponds to the correct value curve.

As described above, the present invention has a learning function that accumulates optimal welding conditions for each welding experiment, so by appropriately distributing the intervals at which actual bath contact condition data are taken through this experiment, positive 14 data can be gradually accumulated. Therefore, even if values calculated by linear approximation are used between each actual welding condition, a uniform adjustment function with sufficiently high accuracy can be obtained.

In addition, it is recommended that conditions other than welding voltage and welding current, such as wire material, gas composition, operator, etc., be assigned identification numbers and stored in the memory, and specified together with these identification numbers when used. For example, it is possible to provide a highly accurate and practical unified adjustment function for all kinds of applications. Moreover, if the number of these data exceeds the capacity of the internal storage unit, if you use external storage to store a wide variety of data, the applications will be limitless, making it an ideal centrally adjustable laminar liquid device. is obtained.

Although it is necessary to have a storage section for welding conditions, it is not necessary to separately provide a storage section for actual welding conditions and a storage section for approximate welding conditions as shown in Figure 1. and the approximate welding conditions obtained by calculation may be stored in the same storage unit. FIG. 3 is a connection diagram showing an embodiment in this case, and unlike the embodiment shown in FIG. be. Further, as the welding power source 1, a power source with constant current characteristics or drooping characteristics is used, and the output signal of the welding current setting section 3 is directly supplied to the welding power source 1 and used as a signal to determine its output current, and the welding voltage is set. The signal is supplied to the wire feed speed control device 2 as a wire feed speed setting signal. The operating procedure is
Although it is approximately the same as the embodiment shown in FIG. 1, the actual welding conditions stored in the welding condition storage section 18 are
The results calculated in step 2 are returned to the welding condition storage section 18 and stored as approximate welding conditions together with the actual welding conditions. Therefore, it is necessary to distinguish between the actual welding conditions and the approximate welding conditions when inputting the actual welding condition data obtained in the next experiment.
For this purpose, codes representing these types may be attached to each piece of data, so that the two types can be distinguished at the time of reading.

Furthermore, only the actual welding conditions are stored in the memory section, and when a welding current is specified during welding, data on both sides of the specified welding current are read out from the stored actual welding conditions and proportional calculations are made. The setting value may be calculated each time by. FIG. 4 is a connection diagram showing an example in which this is done; the approximate welding condition storage section is removed from the example shown in FIG. The condition calculation unit 12 is operated to calculate and output conditions using linear approximation. In the embodiment shown in the figure, the calculation is performed each time welding, but since the calculation itself only requires one simple proportional calculation, the time required for the calculation is hardly a problem. In addition, since it is known that changes in welding conditions will result in the optimum combination of welding voltage for welding current or a gentle curve, the actual welding conditions that should be memorized include dividing the entire bath contact current area into 10 equal parts. The number of welding conditions that can be stored increases dramatically due to the storage capacity.

In each of the above embodiments, a combination of welding current setting value Ir, welding voltage setting value vr, actual welding current value ■a, and actual gap welding voltage value va is handled as welding condition data. If the welding machine body has sufficient accuracy and almost no error occurs between the set value and the actual output value, only the welding current set value Ir and bath contact voltage set value ■r should be handled. You can also do this. Furthermore, in addition to setting the welding current as a standard value for central adjustment that is set by the operator when performing welding, it is also possible to set the welding voltage and extract the corresponding welding current. Also, in any of these cases, the display on the setting device itself is not limited to the welding current and welding voltage that represent the original function, but may also be a scale that simply divides the dial into equal parts, or wire diameter, gas, etc. It may be displayed as follows. Furthermore, it goes without saying that the present invention can be applied not only to arc welding using consumable electrodes but also to non-consumable electrode arc welding in which the electrode position is controlled by arc voltage.

Effects of the Invention As described above, in the present invention, the data of the actual r8 welding result for the combination of welding current and welding voltage required for light adjustment is stored in the storage section, and the portions for which there is no actual data are stored in a simple manner. Obtain data by linear approximation calculation and determine the f-contact condition, and then when new actual data is obtained, calculate the distance between this and the previously accumulated actual data by linear approximation to calculate the previous approximation. Since a learning function is provided to update the calculated data, it is possible to realize a practical unified adjustment function suitable for all working conditions. Moreover, these devices can be manufactured using equipment, which means that the applications of light adjustment are almost limitless, and it is possible to create extremely high-precision, all-purpose, centrally adjustable welding control equipment, which was completely impossible with conventional equipment. It is something that can be done.

[Brief explanation of drawings]

Fig. 1 is a connection diagram showing an embodiment of the present invention, Fig. 2(a)
to C) are diagrams for explaining the operation of the embodiment of FIG. 1, and FIGS. 3 and 4 are connection diagrams showing other embodiments of the invention. DESCRIPTION OF SYMBOLS 1... Bath contact power supply, 2... Motor control part, 3... Welding current setting part, 8... Bath contact current detection part, 9... Welding voltage detection part, 11... Actual bath Contact condition storage section, 12...
Approximate welding condition calculation unit, 13... approximate welding condition storage unit,
14...Storage and playback control unit, 15...Display unit, 16.
...Bath contact voltage setting section, 17...Switching means, 18...
Welding condition storage section. Agent Patent Attorney Hiroshi Nakai Procedural Amendment Column (Voluntary) Commissioner of the Japan Patent Office 1, Indication of the case 1982 Patent @ No. 171976 2, Name of the invention Arc welding control device 3, Person making the amendment Relationship with the case Patent Applicant: 2-1-11 Tayo, Yodoyo-ku, Osaka (026) Osaka Transformer Co., Ltd. 4, Agent Address: 2-1-11 Tayo, Yodoyo-ku, Osaka 532 [Contact Information: Telephone ( 06) 301-1212] 5. Date of amendment order Voluntary

Claims (1)

[Claims] 1. A centrally adjustable arc welding control device in which a set value of either a welding current or a welding voltage is determined in advance in accordance with a set value of the other, comprising a welding current setting section;
A welding voltage setting section, a welding machine main body whose welding current and welding voltage are determined according to setting signals, and a small amount (from the combination of the output Ir of the welding current setting section and the output When a new welding condition is added to the actual welding condition storage section, the new actual welding condition is compared with other previously stored actual welding conditions. an approximate welding condition calculation unit that selects another actual welding condition with a value adjacent to , and calculates the approximate welding condition for each division pitch by calculating between the two by linear approximation with a predetermined division pinch; and the calculation unit an approximate welding condition storage section that stores the calculation results together with the actual welding conditions; and independent output setting means provided in the welding current setting section and the welding voltage setting section, the output of either one of the output setting means output setting means which is directly supplied to the welding machine body as an output setting signal and outputted as a read key for welding condition take from the approximate welding condition storage section; a memory and reproducing control section that receives a signal from the one output setting means and reads out the corresponding welding condition from the approximate welding condition storage section; and an output of the other independent output setting means and the storage and reproducing control section. 2. The actual welding condition storage section stores a welding current setting value Ir, a welding voltage setting value ■, In addition, the actual welding current value Ia and welding voltage value va are also stored at the same time, and the approximate welding condition calculation section calculates the combination of the set values Ir, Vr and the actual output values ■a, va. It is calculated and stored in the approximate welding condition storage section, and when the welding conditions are read out from the storage regeneration control section, at least the bath contact current value I
The arc welding control device according to claim 1, further comprising a display unit that displays the welding voltage value Va and the welding voltage value Va. -3. In a centrally adjustable arc welding control device in which the setting value of either the welding current or the welding voltage is determined in advance in accordance with the setting value of the other, a welding current setting section, a welding voltage setting section, and a setting section are provided. A welding machine body in which a welding current and a welding voltage are determined according to a signal, and a welding condition consisting of a combination of at least the output r of the welding current setting section and the output r of the welding voltage setting section are memorized by a command. When a new welding condition is added to the welding condition storage section, the welding condition is compared with other previously stored welding conditions and another welding condition whose value is adjacent to the new welding condition is selected. an approximate welding condition calculation unit that calculates approximate welding conditions for each division pitch by linear approximation at a predetermined division pitch between the two, and writes and corrects the calculation results in the welding condition storage unit as the approximate welding conditions; The welding current setting section and the welding voltage setting section are each provided with independent output setting means, and the output of either one of the output setting means is directly supplied to the welding machine main body as an output setting signal, and an output setting means that is output as a bath wetting condition reading key from the welding condition storage section; and transmitting the set welding conditions to the welding condition storage section and receiving a signal from the one output setting means and responding accordingly. a storage regeneration control section for reading welding conditions from the welding condition storage section; and a switching means for switching between the output of the other independent output setting means and the output of the regeneration control section and supplying the same to the welding machine main body. Equipped with arc welding control device. 4. In addition to the welding current setting value Ir and the welding voltage setting value vr, the welding condition storage section simultaneously stores the actual welding current ■a and welding voltage va as welding conditions,
The approximate bath contact condition calculation section calculates a combination of the set values "r, vr and the actual output values Ia, va, and stores the result in the welding condition storage section. When the conditions are read out, at least the welding current value I
The arc welding control device according to claim 3, further comprising a display unit that displays the welding voltage value Vλ and the welding voltage value Vλ. 5. In a centrally adjustable arc welding control device in which a set value of either the welding current or the welding voltage is determined in advance in accordance with the set value of the other, a welding current setting section;
A tg consisting of a bath contact voltage setting section, a welding machine main body in which welding current and welding voltage are determined according to a setting signal, and a combination of at least the output Ir of the welding current setting section and the output vr of the welding voltage setting section. a welding condition storage section that stores welding conditions according to commands, and independent output setting means provided in the welding current setting section and welding voltage setting section, respectively, and the output of either one of the output setting means is controlled by the welding machine main body. output setting means that is directly supplied as an output setting signal to;
Using the output of the one output setting means as an input, comparing the input signal with the welding conditions stored in the welding condition storage section, and reading out the welding conditions of values on both sides adjacent to the output of the one output setting means. an approximate welding condition calculation section that calculates another welding condition corresponding to an input signal from two adjacent sets of welding conditions by linear approximation; an output of the other independent output setting means; and an output of the approximate welding condition calculation section. an arc welding control device comprising: switching means for switching between and supplying the welding machine main body; 6. The welding condition storage unit simultaneously stores the actual welding current value la and welding voltage value ■3 in addition to the welding current setting value Ir and welding voltage setting value vr, and the approximate welding condition calculation unit The above set values Ir, Vr and the actual output value I
It calculates and outputs the combination of a and ■a, and m
At least welding current value I of the approximate welding condition calculation section J
The arc welding control device according to claim 5, further comprising a display unit that displays the welding voltage value Va and the welding voltage value Va.