SU1206032A1 - Arrangement for controlling welding current - Google Patents

Description

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(Invention (relates to production and can be used in installations for electric arc welding, as well as in converter equipment.

The aim of the invention is to improve the qualities of the deposited metal by increasing the speed of the welding current control.

The drawing shows the block diagram of the device.

 The device for adjusting the welding current contains a choke 1 thyristor-interrupter 2 and a switching cell 3 consisting of parallel-assembled switching capacitors 4, switching thyristors 5 and reverse diodes 6.. The thyristor control unit contains an indicator 7, a register 8, an input unit 9, a binary-to-binary converter 10, a master clock generator 11, h + I elements 12 and 13, a control generator 14 of 1 QA pulses, and a 15 non-switching pulses driver.

The device works as follows.

When the supply voltage is supplied to the thyristor control unit using the input unit 9, the required current is set, which enters the register 8 and is displayed on the indicator 7. From the register 8, the code enters the binary-to-binary code converter 10, where the code value is at . binary code, and then enters the elements And 12 and 13. The shaper 14 control pulses generates pulses, which include

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thyristor-breaker 2. When turning on the thyristor-breaker 2, the current begins to flow into the load and the capacitors 4 begin to charge in

5 polarities locking the thyristor-breaker 2. The shaper 15 commuting pulses generates pulses that arrive at the control electrodes of the commutators

10 thyristors 5. When switching on the required number of switching thyristors 5, the value of the switching capacity varies depending on how many cells are turned on. therefore

15 when discharging the switching capacitors, the current flowing through the inductor is equal to the sum of the currents of the included cells. Thus, setting the required current using the unit

20 9 inputs, pulses from the driver 15 switching pulses give commands to turn on one or another inverter cell.

The invention allows to increase

25 system performance, reduce the noise level due to the operation of the inverter cells at higher frequencies, in particular at 22 kHz.

The proposed system has been tested.

30 on a power model with an OkW power of 22 kHz with a range of adjustment of the welding current from 2 to 250A with an adjustment step resolution of 2A. This makes it possible to solve the problem of limiting the short-circuit welding current and significantly reducing spatter; improving the quality of the weld metal by optimizing the heat input c.

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weldable metal and accuracy of repetition of welding conditions.

Compiled by G. Tchaikovsky. Editor A. Vorovich Tekhred O. Nezecorrector A. Obruchar

Order 8605/12 Circulation: Subscription

VNISHI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, 4/5 Raushsk nab.

Branch ShSh Patent, Uzhgorod st. Project, 4

Claims (1)

DEVICE FOR REGULATING A WELDING CURRENT, containing a thyristor chopper, the anode of which is connected to the output of the inductor, and a switching cell, consisting of a switching capacitor connected via a switching thyristor to another output of the inductor, and a reverse diode connected in parallel to the switching thyristor, control electrodes connected to their control unit, distinguishing — with the fact that, in order to improve the quality of the deposited metal by increasing the speed of regulation of the welding current, in η additional switching cells were introduced, and the thyristor control unit is made up of input, register, binary decimal to binary converter, h elements' And, a pulse shaper, a serially connected master oscillator, h + i element And and a control pulse shaper ^ wherein ; the second output of the master