SU1639908A1 - Semiautomatic welder with consumable electrode - Google Patents

Abstract

The invention relates to welding with a fusion electrode and can be used in construction, construction, etc. 1) elizobreteniya - expansion of technological capabilities and simplification of the operation of the semi-automatic. The semiautomatic device contains a source of welding current and a device for feeding the electrode wire. An electrode wire feed speed regulator contains a speed starter, two analog switches, two-layers. The invention relates to the field of welding. The purpose of the invention is to expand the technological capabilities and simplify the operation of the semi-automatic. The drawing shows a semi-automatic circuit for welding with a melting electrode. A semiautomatic device for welding a plase-cellulose electrode contains a source of welding current 1 with an increasing external characteristic and a device for decorating a comparator and an inverter on an operational amplifier. The output of one of the switches is connected to the control input of the modulator, made on the basis of the first timer, the triggering input of which is connected to a variable frequency generator made on the basis of the second timer. The output of the modulator is connected to the input of the task unit of the electric drive for feeding the electrode wire. The output of the latter is connected to the electric motor. The semiautomatic device operates in the stationary mode of welding in the area of low and high welding currents, and in the area of medium currents it automatically switches to the welding mode with modulated current. In the latter case, the regulation of the average integral feed rate is carried out by changing the pulse duty cycle. In the whole range, the feed rate is controlled by a single setting unit, which ensures ease of operation of the device. 1 electrode of the electrode wire, including an electric motor 2 connected to the device 3 for controlling the feed rate of the electrode wire. The latter contains a speed reference 4, connected to the first and second analog switches 5 and 6 and to a two-level comparator 7, the output of which is connected to the control input of the first switch, and through an inverter on the operational amplifier 8 to the control input of the second switch 6. 1V O CO CD CO O 00

Description

The output of the second switch 6 is connected to the control input of the modulator 9 on the first timer, the triggering input of which is connected to the generator 10 being changed, -. frequency on the second timer. The output of the modulator 9 together with the output of the first switch 5 is connected to the input of the task unit of the electric drive 11 for feeding the electrode wire. The output of the last J.Q is connected to the electric motor 2.

Semiautomatic works in the same way.

The two-level comparator 7 is configured in such a way that at a setting voltage, corresponding to small and large welding currents, there is a single potential at its output, and at a setting voltage corresponding to average currents (forbidden zone), it is zero. This 20 signal controls two analog switches 5 and 6, which, in the range of average welding currents, disconnect the sensor 4 from the input of the electric drive 11 (switch 5) and connect setpoint 25 4 to the input of the modulator 9 (switch 6). The semiautomatic device passes from the stationary mode of welding to modulated. The adjustment of the average integral value of the electrode wire feed rate within the range of average welding currents (in modulation mode) is carried out by changing the pulse duty cycle and is implemented by the modulator 9. The pulse sequence generator 10 allows the pulse current and pause frequency of the welding current to be changed discretely. In any case, the welding voltage adequate to the welding current is provided by the increasing external characteristic of the welding current source, corresponding to the optimum range of welding conditions and ensuring coordination of the welding current and voltage in both stationary and modulated modes.

The semiautomatic device is implemented on the basis of a PG1-107V semi-automatic welding machine with a VDU-506 source, modified 50 to provide an increasing external characteristic. In the device for controlling the feed rate of the electrode

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wires are applied: timer KR1006 VI1, analog switch KG: / 64KTZ, double comparator KR521 CA1, operational amplifier KR544UD1. The semi-tomato ensures efficient operation with low spatter and good seam formation in the whole range of possible modes (without lighting zones). at the same time, the modulated-current welding mode requires tuning in just one parameter (not counting the average integral feed rate) —the modulation frequency.

Thus, in comparison with the basic prototype object, the proposed semiautomatic device provides wider technological capabilities with a simpler mode setting.

Claims (1)

Invention Formula A semiautomatic machine for welding with a melting electrode, containing a device for supplying an electrode wire with an electric motor and a device controlling the feed rate of the electrode wire, as well as a source of welding current with an increasing external characteristic, characterized in that, in order to expand technological capabilities and simplify operation, the device electrode wire feed speeds include speed master, first and second analog switches, two-level comparator, inverter, mod a torus, a generator and an electric drive setting unit, supplying electrode wire, the speed unit being connected to the first and second analog switches and to a two-level comparator, the output of which is connected to the control input of the first switch, and through an inverter to the control input of the second switch, and the output of the second switch is connected to the control input of the modulator, the triggering input of which is connected to the generator, while the output of the modulator, together with the output of the first switch, is connected to the input of the electronic reference unit rodrive electrode wire feed.