SU1368128A1 - Stabilizer of pulsed arc voltage - Google Patents

Abstract

The invention relates to arc welding, in particular, to a voltage regulator of a pulsed arc during welding with a non-consumable electrode. The purpose of the invention is to improve the quality of welding by ensuring the accuracy of the position of the burner during the pulse and arc pause. The stabilizer contains a source of welding current, a welding torch, a comparison device, a memory device, a pulse generator, three keys and a series-connected amplifier-converter, a motor, and a gearbox. The goal is achieved by introducing into the stabilizer a standby multivibrator, two inverters and an AND element connected to the stabilizer nodes so that during the end of the welding current pulse and during the next pause, the arc length is memorized to the next welding current pulse. 2 Il. (V)

Description

The invention relates to devices for the automatic control of the arc welding process with a non-consumable electrode and is intended to stabilize the arc length by voltage during pulsed welding.

The purpose of the invention is to improve the quality of welding by ensuring the accuracy of the position of the burner during the pulse and arc pause.

FIG. 1 shows the structural scheme of the proposed stabilizer; n FIG. 2 - graphs of voltage changes in individual circuits of the circuit.

The pulse voltage regulator contains (Fig. 1) a welding current source 1, the output terminal of which is connected to the welding torch 2, with the first input of the comparison device 3 and the memory input of the storage device 4. The welding current source 1 is also connected to the generator 5 input pulses, the output of which is connected to the inputs of the waiting multi-vibrator 6, the first inverter 7 and the control input of the first key 8

The signal input of the key 8 is connected to the source of the driving voltage, and the output is connected to the second input of the comparison device 3. The output of the standby multivibrator is connected via the second inverter 9 to the control input of the second switch 10, the signal input of which is connected to the output of the device 3, and the output to the input of the amplifier-converter 11. The output of the latter is connected to the motor 12 through the gearbox 13 In addition, the outputs of inverters 7 and 9 are connected to the inputs of an element 14, the output of which is connected to the control inputs of the storage device 4 and the third key 15, the signal input of which is connected to the output of the storage device 4, and the output - with the third input of the device 3 comparison.

The stabilizer works as follows (Fig. 1). ,

. The impulse voltage from the source 1 of the welding current goes to the welding torch 2, to the first input of the comparison device 3 and to the signal input of the storage device 4. During the pulse time of the welding current 0-t, (Fig. 2a), the pulse generator 5 synchronized with the source 1, a straight angle pulse (Fig. 26), entered

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the inputs of the standby multivibrator 6 ti of the first inverter 7 and the control input of the first key 8. The multivibrator produces pulses of duration t,. ,, shifted relative to

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pulses of the generator 5. The time t is chosen longer than the transition time of switching the welding current source. Through the second inverter 9, the signal from the multivibrator 6 is fed to the control input of the second key 10. Under the action of the pulses of the generator (Fig. 26) and the second inverter (fng.2g), the keys 8 and 10 are unlocked. Through the first switch 8, the second input of the device for comparison with the source of the driving voltage receives the voltage Nao, which is proportional to the required arc voltage during the pulse. As a result, c. the pulse output voltage device 3, equal to Ea) j Uqo-Ua, through the second switch 10 is fed to the input of the amplifier-converter 11, from the output of which the voltage goes to the engine 12, which through the gearbox 13 moves the burner 2 in the direction of decreasing Food. Thus, during a pulse, it is kept at a constant level Un, proportional to the arc length.

JBo pause time due to the signals coming from the inverter 7 (fig.2d) and inverter 9 (fig.2g) to the inputs of the element 14, a signal of duration is formed on its code. (Fig. 2e)., under the action of which the storage device 4 is transferred to the storage mode, and the third key 15 is switched to the Enabled mode. Thus, during the time tf, the third input of the comparison device receives a voltage Uaj, equal to the arc voltage at ts-tj and is used as a driver. During the pause, the key 8 is open and the voltage on the comparison device does not flow. As a result, from the output of the latter through the key 10 to the input of the amplifier converter 11, a signal E, “Uc.-Un, enters, under the action of which the stabilizer through the motor 12 and the gearbox 13. moves the burner, so that it CONDENS; Elg to zero.

Thus, the input of the amplifier - converter 11 during a pulse receives the signal Eau Uno-U, during the transient time of the welding current source, the code terminal of which connects its key, and the standby output is multivibrated with the welding torch and the first input comparison device, a memory device, a pulse generator, the output of which is connected to the control input of the first key, the signal- erator through the second inverter is connected to the second input of the AND element and the control input of the second key, the output of the third key and is connected to the third input of the comparison device.

its key, and the output of the waiting multivib

A second inverter is connected to the second input of the AND element and the control input of the second key, the output of the third key is connected to the third input of the comparison device.

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Claims (1)

Formula of the invention A voltage regulator of a pulsed arc containing a welding current source, the output terminal of which is connected to the welding torch and the input of the comparison device, a charging device, an ow generator, the output of which is connected ί the first Figure 1 Editor I. Gornaya Compiled by V. Gribova Tehred I.Popovich Proofreader M. Pozho Order 151/13 Circulation 920 Subscribed VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., D. 4/5 Production and printing company, Uzhgorod, Project 4,