JPS6082274A - Device for controlling movement of pulse tig welding device - Google Patents

Abstract

PURPOSE:To provide a titled device for controlling movement which performs easily satisfactory pulse TIG welding with conventional equipment in pulse TIG welding by moving the point to be welded between the set current values below each peak current value and above the small current value. CONSTITUTION:The current detected by a current detector 10 of pulse TIG welding is compared with the current of a setter 16 for an upper limit value lower than the peak current and the current of a setter 17 of a lower limit value higher than the small current and if the current is of the value between the two currents, the instruction from a speed setter 21 for a table is inputted SW1 by an AND circuit 20 and the table is moved by a motor 25. Since the table is not moved in the stage of a fluctuation, bead indentation is satisfactorily generated and the fluctuation in bead width owing to the fluctuation in the input is increased, by which satisfactory welding is accomplished. This control device is inexpensively and easily installed to the conventional TIG welding device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movement 11jlJ control device for a pulse TI (four-welding device (inert gas tungsten arc bath welding device for performing pulse arc welding)).

In TIG welding, spray transfer occurs only when the current exceeds a certain limit, but below that, the molten pool becomes teardrop-shaped and the melting history becomes large, making it easy for the bead to become dented and not to produce a beautiful bead. On the other hand, in pulsed TIGM welding, a pulsating current of 1.5 to 2 times the magnitude is added to the small current, and the arc is stopped at the peak current and moved at the pace current, so the molten pool is It becomes round and the above T I a (
In the case of single contact, the bath contact volume is smaller than the Uranami bead width, so bead dents are less likely to occur, and the bead width changes less with respect to heat input fluctuations.

Conventionally, the Nozorus TI that performs such) Zorus TIG casual contact
As shown in FIG.
On the other hand, the amplifier 5 obtains a synchronization signal from inside the power supply 81 and amplifies it to control the motor 5 and rotate the rotary table 6 intermittently. The welding power source 2 has, for example, a thyristor, and its output current is controlled by the ignition/fil angle command from the 11i11# device 1. In addition, in this case, the It is assumed that the periphery of the object to be bathed which has a butt groove Im is welded.

As mentioned in 5 above, pulse TIG welding equipment having a drive means (motor) for intermittently moving between the torch and the workpiece is special and expensive; The problem is that the device is not even equipped with a terminal to control the motor, and the jx 5K requires special ordering and modification, which costs a lot of money.

The present invention has been made in view of the above-mentioned circumstances, and is a movement control system for a Noculus TIG bath welding device that allows intermittent movement between the torch and the workpiece during Noclus arc welding using an inexpensive device without major modifications. #Aims to provide equipment.

According to this invention, the current waveform '4r of Nozzle down which is a characteristic of Nocellus TZG bath contact is detected by a current detector,
Is this detected voltage VV, the pace of the waveform 'between the torch and the hot bathing object at 1 mountain in the sleepy area? IIJ drive raw board to transfer
The above purpose has been achieved by ensuring that there is no J-run.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows the movement tf of the pulse TIG welding device according to the present invention.
It is a block diagram showing one embodiment of the i-control device a.

In the same figure, the 'it current detector 10 detects the welding current applied to the torch 12 from the bath welding galvanic corrosion IJ during I sols arc welding, and converts the welding current to a ratio of 1
Add to f-boxes 14 and 15. Here, an example of the output signal af)/l[form of the ronos filter 13 is shown in FIG.
Show JK.

The upper limit value setting device 16'M and the lower value setting device 17 set the current value, that is, the upper limit value and the lower limit value, for detecting the small current section (pace current section) of the welding current during pulsed arc bath welding. The digital setting values set here are applied to other inputs of comparators 14 and 15 via D/A converters 1B-M and 19, respectively. An example of the levels of the analog upper limit 11iiX1 and lower limit 2 converted by the D/A converters 18 and 19 is shown by the broken line K in FIG. 3 (4a).

The comparator 14 compares the detected current value a and the upper limit value 11, and when the X current value a is smaller than the upper limit 1fil□, it becomes level 11, and when it is larger, it outputs a signal bft output (
Figure 3 1b) Diagnosis If@). Further, the comparator 15 compares the detected current 1i1a and the lower limit value I2, and tRliσa
When is larger than the lower limit value 12, No. 41 C is output, which becomes H level, and when smaller, it becomes L level (see FIG. 3 (see el)).

The respective output signals S and C of comparators 14 and 15 are added to an AND circuit, where an AND condition is taken. The output signal d of the AND circuit (see Figure 3 (dl)) is used to open and close the switches 8Wl and 8W2.
HL/ Bell's sword is SWIN f 8Wl and HSW2
Both are closed, and when the level is L, switches 8W1g and SW2'g are both opened.

The speed setter 2] is used to set the movement speed during intermittent movement, and when the switch SWl is closed, the speed command 111 set here is added via the D/A converter and the switch 8Wl. Added to point B.

The speed signal of the motor 6 is added from the speed detector to the other input of the addition point, and the addition point B takes the deviation of the two human power signals and outputs this deviation signal to the motor 5 via the servo amplifier 26. 1-ro.

Therefore, the motor 6 is intermittently operated at the speed set by the speed setting device 2 every time the switch SWl is closed.

The motor δ rotates a rotary table on which a cylindrical workpiece is placed, as shown in FIG. M1, for example.

Also, when the switch 8W2 is closed, the lamp! The circuit becomes closed and rung n lights up.

It is also possible to stop the motor 25 by preventing the first few pulses of the pulse number 1g outputted from the AND circuit from being applied to the switches swi and sW2 using a caranta or gate circuit.

In addition, not only when moving the object to be welded by the motor B, but also when moving the torch 129111 and moving the torch and ''?
jl may be moved between welded objects.

As explained above, according to the present invention, it is possible to intermittently move the torch and the workpiece f6 during arc welding with the inexpensive device 1, and it is also possible to move the torch and the workpiece f6 intermittently during arc welding, and to It can be easily applied to TIG common connection equipment.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional pulse 'I' IG welding device including a movement control device, and Fig. 2 is a schematic diagram of a conventional pulse 'I' IG welding device including a movement control device.
A block diagram showing an embodiment of the transfer MJ control device of the G bath contact device, Figures M3 (1 to dl are used to explain the second factor) ...Current detector, 13...Bath f&11E source, 12...Torch,
14, 15...Comparator, 16...Upper limit setting miscellaneous profit,
17... TPit value setter, 21... Speed setter,
δ...Motor, SWl, SW2...Switch. Figure 1 5

Claims (1)

[Scope of Claims] (υ) A pulse TIG welding device that performs pulse arc welding includes a current detector for detecting the bath current R flowing to the tungsten electrode of the torch, and a current detector for detecting the small current section of the welding current. an upper limit value setter and a lower limit value setter;
a comparator for detecting an interval in which the current value detected by the current detector is smaller than the upper limit value set by the upper limit setter and larger than the lower limit value set by the lower limit setter; and a detection output of the comparator. A movement control device for a pulse TIG welding apparatus, comprising a drive means for intermittently moving a torch and a workpiece based on the following. (2) All above! The upper limit value set by the setting device is a value smaller than the peak current value of the welding current and larger than the small NR value, and the lower limit value set by the lower limit value setting device is smaller than the small NR value of the welding current. The movement i [II
J goso + flt a