SU1507545A1 - Apparatus for following up the line of joint - Google Patents

Abstract

The invention relates to welding production, in particular to the automation of welding processes, and can be used in arc welding with a melting electrode with transverse vibrations of the welding head to automate its welding along the joint. The purpose of the invention is to improve the accuracy of tracking the joint line. The device contains a source of welding current, a sensor of welding current with an amplifier, two analog switches, two smoothing filters, an adder, an electrode oscillation phase sensor, an electrode oscillation drive, an electrode oscillation frequency adjuster, a transverse correction drive. An additional unit for distinguishing the modulus of the signal of the difference of currents in the phases of the oscillations of the electrode, the second adder, the pulse shaper of adjustable duration, the third analog switch and the third smoothing filter are added to the device. The newly introduced blocks ensure the formation of a functional dependence of the transverse correction rate on the oscillation frequency of the welding electrode. This eliminates the overshoot of the electrode position with a low oscillation frequency of the welding torch. 1 il.

Description

The invention relates to welding production, in particular to the automation of welding processes, and can be used in arc welding with a melting electrode with transverse vibrations of the welding head for automating the lead of its weld.

The aim of the invention is to improve the accuracy of tracking.

The essence of the invention lies in the formation of the functional dependence of the transverse correction rate on the oscillation frequency of the welding electrode.

The drawing shows a functional diagram of the device.

The device for tracking the joint line contains a welding current source 1 connected to the welding current sensor 2, which is connected to the welding electrode 3 and the input of the amplifier 4. The output of the amplifier 4 is connected to the information inputs of the first and second analog switches 5 and 6. Control input the first analog switch 5 is connected to the sensor 7 of the oscillation phase of the electrode through the inverter 8, and the control input of the second analog switch 6 is connected directly to

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the output of the sensor 7 phase oscillations of the electrode. The sensor 7 of the oscillation phase of the electrode provides a signal of a logical unit in the left phase of oscillation of the electrode and a logical zero in the right phase. The actuator 9 oscillations of the electrode contains an electric motor connected to the sensor 10 of the oscillation frequency of the electrode. The sensor 7 of the oscillation phase of the electrode is connected to the motor drive of the 9 oscillation of the electrode 3. The output of the first analog switch 5 is connected to the input of the first smoothing filter 11, and the output of the second analog switch 6 to the input of the second smoothing filter 12. The outputs of the smoothing filter 11 and 12 connected to the inputs of the first adder 13, the output of which is connected to the input of the module 14 for extracting the signal module, which is a full-wavelength generator, and the information input of the third analog switch 15.

The output of block 14 of the signal module is connected to one of the inputs of the second adder 16, the other input of which is connected to the generator 10 of the oscillation frequency of the electrode. The output of the second adder 16 is connected to the control input of the driver 17 for pulses of adjustable duration. The starting input of the imaging unit 17 pulses of adjustable duration is connected to the output of the sensor 7 of the oscillation phase of the electrode. The output of the driver 17 is connected to the control input of the third analog switch 15, the output of which is connected to the input of the third smoothing filter 18. The output of the latter through the transverse correction drive 19, containing an electric motor (not shown), is connected to the welding head 20.

The device works as follows.

When welding is performed and the oscillating drive motor of the electrode 3 is in operation, the sensor 7 of the electrode oscillation phase generates square pulses with the oscillation frequency of the electrode, which are inverted by the inverter 8. Thus, at the output of the sensor 7 of the oscillation phase of the electrode and inverter 8, back phase and serving for switching the signal from the welding current sensor 2 through the amplifier 4 to the inputs

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first and second analog. : |., 5 and 6 in the right and right phases of the institute electrode electrode 3. The signals from the outputs of the analog switches 5 and 6 are smoothed out by the first and second smoothing switches of lines 11 and 12, respectively. The smoothed signals at the inputs of the first adder 13 are subtracted therein. Thus, at the output of the adder 13, a signal is formed that characterizes the displacement of the electrode from the butt-line both in magnitude and in direction. The deviation caused by the control signal depends on the oscillation period of the electrode. Therefore, when the oscillation frequency is low, due to the slow updating of information in the oscillation phases of the electrode, an error occurs in the tracking of the junction line by the electrode, which makes it necessary to take the transverse correction drive to take into account not only the difference of currents in the phases of oscillations of the electrode, but also its frequency of oscillations.

The module 14 of the allocation of the signal module generates a signal of the absolute value of the current difference, which is summed in the second adder 16 with a voltage from the oscillator frequency generator 10, which is proportional to the oscillation speed of the electrode 3. The signal from the electrode oscillation phase sensor 7 arrives at the adjustable pulse generator 17 duration, it starts up on the leading edge, and the pulse duration is determined by the voltage from the second adder 16 arriving at the control input of the imager 17. At The volume of the signal at the output of the driver 17 impulses of adjustable duration will depend on the magnitude of the difference in currents in the left and right phases of oscillation of the electrode. A greater difference in the currents at the output of the first adder 13 will correspond to and a longer duration of the signal at the output of the driver 17 pulses of adjustable duration. The signal from the driver 17 is the control for the third analog switch 15, which commutes the signal of the difference of currents in the left and right phases of the oscillations of the electrode. The signal from the third analog switch 15 smoothed by the third smoothing filter 18 is transverse

Claims (1)

SUMMARY OF THE INVENTION A junction line tracking device comprising a welding current source, a welding current sensor, the output of which 15 is connected through a series-connected amplifier, the first analog switch and the first smoothing filter to the first input of the first adder, the amplifier output also through the second analog switch and the second smoothing filter is connected to the second input of the first adder, the drive transverse correction of the welding head, the oscillation frequency generator welding elektrode-25 of the trod connected to the oscillation drive of the welding second electrode, the phase detector of the welding electrode oscillation, the output of which is connected to the control 5 4 the input of the first analog key through the inverter and with the control input of the second analog key, characterized in that, in order to improve the tracking accuracy, it is additionally equipped with a signal module isolation unit, a second adder, an adjustable pulse shaper, a third analog key and a third smoothing filter wherein the output of the first adder is connected to the input of the signal module allocation unit and through the third analog key and the third smoothing filter connected in series to the input of the drive a correction of the welding head, the first input of the second adder is connected to the output of the oscillation frequency adjuster, the second input of the second adder is connected to the output of the signal module isolation unit, and its output is connected to the control input of an adjustable pulse shaper, the triggering input of which is connected to the output of the oscillation phase sensor, and the output is with the control input of the third analog key.