SU1310141A1 - Apparatus for multi-electrode welding - Google Patents

Abstract

The invention relates to the field of welding, namely, devices for multi-electrode welding and welding of machine parts during their manufacture and repair. The invention makes it possible to increase the productivity of the welding process by providing the device with the possibility of switching from an arc of direct action to an arc of indirect action. This device is supplemented with a regulating unit, which, at the time of the disconnection of the direct action arc, connects an additional source for supplying the indirect action arc. When a direct arc occurs, the auxiliary power source is turned off. 1 il. Yu

Description

one

Invention relate ;; to welding, and to the devices / w multi-electrode welding and naplavka machine parts during their manufacture and repair

The aim of the invention is to increase the productivity of the welding process.

The drawing shows a diagram of the device.

The device contains the main source I for supplying the direct arc, a welded product 2 connected to one pole of the main source 1, a control unit 3 for cyclically switching the current from the direct arc to an arc of indirect action that is connected to the other pole of the main source I, electrodes 4 and 5, connected via unit 3 to source 1, control unit 6, and additional source 7 for powering the arc of indirect action. Electrodes 4 are connected to source 7. Through resistors 9 and solenoids 8. Solenoids 8 are located coaxially with electrodes 4 and 5. Diodes 10 are connected to the power supply circuit of electrodes 4. the capacitor 12 and the primary winding 13 of the pulse transformer, which also has secondary arresters 14 and 15, are connected in phase to the control circuits of the switches 16 and 17, made in the form of thyristors and included in the control unit 6. The control unit 6 includes also e capacitor 18 and resistors 19 and 20.

The device works as follows.

First, the power sources and 7 are connected to the mains. Then the electrodes 4 and 5 are fed by a mechanism with a constant feed rate (not shown). When one of the electrodes 4 or 5 is short-circuited to the product 2, a short-circuit current flows from the power source 1 through the circuit: plus source 1, resistor 11 of block 3 - electrode 5 (or diode 10 - electrode 4) - product 2 - minus source I. The short-circuit current fuses the end of the short-circuited electrode and initiates a direct action arc between this electrode and product 2. At

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five

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five

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five

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five

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the passage of a short-circuit current across this circuit on a resistor II, a voltage arises that creates a pulse in the circuit: koshensagor 12 - the primary winding I 3 of an impulse-type transformer. The emerging pulse on the secondary winding 15 of the pulse transformer opens the thyristor 17. The capacitor 18 is charged from source 7 along the circuit: minus source 7 - thyrispor 17 - capacitor 1B - resistor 20 - plus source 7. Pulsed from winding 15, speaker 1 - tor 17 is supported open circuit current: plus source 7 - resistor 19 - thyristor cf - minus source 7.

While the direct arc is on, in this circuit, after charging the capacitor 18, does not occur. Due to the large no., The current flow voltage from the source 1, which provides V V, where Vp is the electric wire melting rate, and UE is the electrode wire feed rate, the length of the direct arc increases until it breaks. After a direct arc action on the resistor 11, the voltage disappears. In the circuit: capacitor 12 - the primary winding 13 of the pulse transformer creates a reverse pulse. The resulting pulse on the secondary winding 14 of the pulse transformer opens the thyristor 16. Once the thyristor 16 is opened, the thyristor 17 is prohibited, since the voltage of the capacitor 18 through the opening thyristor 16 will be applied to the thyristor 17 in the opposite direction. A group of electrodes 5 through the thyristor 16 is connected to the negative pole of the source 7, and a group of electrodes 4 is connected to the positive pole of the source 7 through the current-limiting resistors 9 - solenoids 8. An arc of indirect action between the electrodes 4 and 5 is excited. source 7 circuit: minus source 7 - thyristor 16 - capacitor 18 - resistor 19 - plus source 7,

Due to the power supply of the solenoids 8, a magnetic field is excited, directed along the axis of the electrodes 4 and 5 to the product 2. Drops of the electrode metal by the magnetic field of the solenoids 8 are directed

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are in the weld pool. This reduces the loss of electrode metal nl spatter. When burning, an indirectly operated meadow supplied from source 7 with a lower current intensity than source 1, the melting rate of the electrodes is lower than the rate of their supply, therefore one of the electrodes or 5 is closed on product 2. With a high short circuit from source -1 the end of the electrode is melted and the direct action arc ignites again. At the moment of short sticking of electrode 4 or 5 to product 2, a voltage arises on resistor 11, which creates a pulse of the circuit: capacitor 12 - Leurv-HN winding 13 imp. transformer. ;. :) a JlHA pulse on the secondary volt (-: 1. -: ke ij of the pulse transformer opens the thyristor 17. Once the thyristor 17 is opened, the thyristor 18 is prohibited, since the voltage of the capacitor 18 through the opened thyristor 17 will be applied to the thyristor 16 in the opposite direction. In this way, the indirect supply arc from the source 7 is broken. As the welding process continues, the cycles are repeated. At the end of welding, the products turn off the electrode supply first and then disconnect from the power supply circuit 1 and 7.

Editor A. Gulke

Compiled by V.Puchinsky Tehred V.Kadar

Order 1850/11 Circulation 976 Subscription

VIIIPI State Committee of the USSR

for inventions and discoveries I 3035, Moscow, Zh-35. Raushsk nab. 4/5

Proizg one-printing company, Uzhgorod, Projecto st., 4

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Compared with the basic prototype object, cyclic switching from an arc of direct action to an arc of indirect action leads to an increase in welding productivity. In addition, the welding performance is due to the reduction of electrode metal spillage losses due to the action of the magnetic field of the solenoids in the direction of the cooking bath during the arc of the indirect action.

Claims (1)

Invention Formula A device for multi-electrode snuffing - containing oc-nrsHofi and additional sources, a control unit with switches, characterized in that, in order to improve the performance of the welding process, the device further comprises a control unit consisting of a resistor, a capacitor and a pulse transformer and a circuit of a series-connected capacitor and the primary winding of a pulse transformer is connected parallel to the resistor, and each of the two secondary windings of a pulse transformer is connected to the circuit control switches. Proofreader M. Pojo