SU1063555A1 - A.c.power supply for dual-arc welding (its versions) - Google Patents

Abstract

1. An AC power source for double-arc welding, containing two transformers and a ballast load, when the primary winding of the starter transformer is connected to the terminals of the AC network, and one end of the secondary winding of the second transformer is connected to the first output of the source, tl and h and in order to save electricity, by reducing losses neither ballast load, one end of the secondary winding of the first transformer is connected to the other end of the secondary winding of the second of the transformer and a second power output, and the other end of the secondary OA1 "quipment first transformer is connected through the primary winding of the second to the third transfO1 1atora vyhodsm source.

Description

2. An alternating current power source for double-arc welding, containing two transformers and a ballast load, the primary winding of the first transformer being connected to the clamps of the AC network, and one end of the secondary winding of the second transformer is connected through a ballast on / load to the first output source. the fact that, in order to save electricity by reducing losses on the ballast load, one end of the secondary winding of the first transformer is connected to the second output of the source, the other end is orichnoy first winding of the transformer via) bbmotku primary of the second transformer connected to the third source output and the other end of the secondary winding of the second transformer.

The invention relates to welding production, in particular to alternating-feed power sources for two-arc welding. An alternating current power source for double-arc welding is known i. A disadvantage of the known source is that the power consumed from the network considerably exceeds the net power due to losses on the ballast load. The closest in technical essence to the present invention is an AC power source for two-arc welding, containing two transformers, in the secondary circuit of each of which ballast load 2 is connected. A disadvantage of this device is that the power consumed from the network significantly exceeds useful ms due to losses on the ballast load included in the circuit of each of the arc gaps As for reliable ignition of the arc and its steady burning, the no-load voltage of the secondary kazh dogo second winding of the transformers to be three or more times greater than the drop in direct voltage to the burning arc, the power loss of the ballast load respectively in two or more times gkzevyshaet useful power. The purpose of the invention is to save energy by reducing losses on the ballast load. The goal is achieved by the fact that in the AC power source for two-arc welding, which contains two transformers and a ballast load, the primary winding of the first transformer is connected to the AC power clamps, and one end of the secondary winding of the second transformer is connected to the first source output , one end of the secondary winding of the first transformer is connected to the other end of the secondary winding of the second transformer and the second output of the source, and the other end of the secondary windings of the first transformer. RA is connected through the primary winding of the second transformer to the third output of the source. In an AC power source for double-arc welding, which contains two transformers and a ballast load, the primary winding of the first transformer is connected to the terminals of the AC network, and one end of the secondary winding of the second transformer is connected to the first output of the source through the ballast load the transformer is connected to the second output of the source, the other end of the secondary winding of the first transformer is connected through the primary winding of the second transformer to tert the output of the source and the other end of the secondary winding of the second transformer. FIG. Figures 1 to 4 show embodiments of an AC power supply circuit for two-arc welding. The source contains a step-down isolation transformer 1, a power transformer 2 and a ballast load 3. The primary winding 4 of the power transformer 2 is connected to the secondary winding of the isolation transformer 1 through one of the arc gaps, while the second arc gap is connected to the secondary 1st winding 5 of the power transformer 2 through a ballast load 3. In the sources, the schematic diagrams of which are presented in FIG. 1 and 3, the primary winding circuit closes through the arc between the electrode 6 and the workpiece to be welded, and the secondary winding 5 closes through the arc between the electrodes. The source circuit diagram is shown in FIG. 2, the circuit of the primary winding 4 is closed through an arc that burns between the electrode, and the circuit of the VTOrichny winding 5 through an arc that burns between the electrode 7 and the welded part. In the source, the circuit diagram of which is shown in FIG. 4, the primary and secondary circuits of the power transformer 2 are closed through arcs burning from electrodes b and 7, respectively.

Consider the operation of the device for the case when the transformation ratio of the power transformer 2 unit OR is close to whose, and the currents in its primary and secondary windings are almost the same. In order to ensure reliable ignition and its steady burning during welding, the voltage of the secondary winding of the power transformer 2 is selected as in the known schemes, while the secondary voltage of the isolation transformer is 1 dol. It is possible to exceed the voltage of the secondary winding of the power transformer 2 by the amount of voltage drop across the arc

At the same time, the power transformer 2 operates as a normal transformer, with the only difference that the current of its primary winding closes through from arcs, and the flow of this current does not cause additional losses on the ballast load, and the smlness on this arc is consumed directly from the network in this case, from the secondary winding of the isolation transformer.

The excitation of an electric arc is carried out by one of the known methods; touch or strike. A prerequisite for successful ignition of the arc is the simultaneous contact of both electrodes with the part being welded. After ignition, two arcs simultaneously burn.

Limiting and adjusting the current in both arc gaps is carried out by the ballast load 3 in the secondary winding circuit 5 of the power transformer 2, and the current in the primary winding circuit 4 and connected in series with it

the gap is determined by the parameters of the load of the secondary winding 5 and, with a transformation ratio equal to one, it will be almost equal to the current value in the secondary winding circuit

(excluding magnetizing current, the value of which is insignificant compared to the load current L

Thus, in the proposed device, when there are two simultaneously burning arcs, the ballast load is connected only to the chain of arcs, as a result of which, compared with devices with two ballast loads, a reduction in the consumed is achieved. from the power network to the value of losses in one of the ballast loads.

The ballast load 3 may be absent if a weakened magnetic transformer is used as a power transformer 2 with the connection between its primary and secondary windings. The current through the arc is limited by the increased inductance of the dissipation of the secondary winding of the transformer,

Compared to the base object. The proposed power source provides energy savings for

an account of elimination of losses on the ballast load.

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Claims (2)

POWER SUPPLY »AC FOR TWO-ARC WELDING (ITS OPTIONS). (57) 1. AC power source for two-arc welding, containing two transformers and a ballast Electrode. # 1 / Weldable part The JfZ electrode is the load, while the primary winding of the first transformer is connected to the 'AC mains terminals, and one end of the second winding of the second transformer is connected to the first output of the source through a ballast load, which means that, in order to save energy, by reducing losses at the ballast load / one end of the secondary winding of the first transformer is connected to the other end "* of the secondary winding of the second transformer and the second output of the source, and the other end of the secondary winding of the first trans Shaper connected through the primary ob- _e Hank second transformer with output tim tre- $ "* source. e SB SP Sl Οι> 2. An AC power source for two-arc welding, containing two transformers and a ballast load, while the primary winding of the first transformer is connected to the terminals of the AC mains, and one end of the secondary winding of the second transformer is connected through the ballast to the first output of the source, which differs in order to save electric energy by reducing losses on the ballast load, one end of the secondary winding of the first transformer is connected to the second output of the source, the other end to the second ary winding of the first transformer via .'pervichnuyu winding of the second transformer connected to the third source output and the other end of the secondary winding of the second transformer ί.