SU1659180A1 - Multioperator electric arc welding set - Google Patents

Description

The invention relates to multi-station power sources and DC installations for electric arc welding in protective gas. The purpose of the invention is to improve the quality of welding by expanding the range of regulation of the welding current and increase the reliability of sentry devices in operation. Many inventions relate to multipole power sources and direct current installations for electric arc welding in shielding gas, mainly carbon dioxide.

The purpose of the invention is to improve the quality of welding by expanding the range of regulation of the welding current and increase the reliability of the guiding devices.

The drawing shows a detailed block diagram of a multi-station installation for electric arc welding.

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This installation contains a power transformer connected to individual regulators, which include a contactor, a control unit, a saturation inductor, a rectifier unit and a welding choke. Three-phase voltage from the transformer is fed to the input of the saturation throttles, through the contactor to the rectifier unit and to the welding station. The change in welding modes is performed by biasing the saturation chokes with the help of the voltage generated by the control unit, which is stabilized by the voltage of the controlled station. Step regulation e is accomplished by disconnecting one phase of the saturation throttle and connecting the free winding to the rectifier unit, which makes it possible to go from welding in continuous mode to welding in pulsed mode. 1 il.

Multi-station installation contains a power transformer 1, connected ^! three-phase busbar 2 with individual regulators 3, in which the contactors 4 are located, the control unit 5, the saturation inductor 6, the rectifier unit 7, the welding throttle 8. The individual regulator 3 is connected to the welding station 9 from series capacitor and choke

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11, and the normally closed contact of the contactor 4 through diode 12 is connected to the output terminals 10 of the individual regulator 3. The operation of a multi-station installation is as follows.

At the input of the saturation throttles 6, the trach-phase voltages come from the power transformer 1 and when the contactor 4 is closed, it goes to the rectifier unit 7 and then goes to the welding station 9. The welding modes change in the range of high and medium welding currents (330-200 A) Saturation throttles 6 using the voltage generated by the control unit 5, which is stabilized by the voltage of the controlled post. Changing the welding modes in the range of medium and small currents (200 - 100 A) is carried out when the contactor 4 is open. In this case, the mode of operation of the individual regulator 3 becomes pulsed. The two feeding phases of the busline 2 provide a pulsating change in the instantaneous voltage and current, with an average level of 0.6 of the no-load voltage of the power transformer 1. Stable burning of the welding arc, after passing a voltage and current pulse, is provided by the choke 8 and the electromotive voltage induced in phase In the three-phase busbar 2, and supplied to the welding network through the diodes 12, connected to the normally closed contact of the contactor 4.

Changing the welding mode in this case is carried out by biasing the saturation throttles.

Compared with the base object, this installation provides the possibility without the use of complex regulators, having one three-phase busbar, to make the transition from welding in continuous mode to welding in a pulsed mode and, thus, change the welding mode at the welding station in a wide range of voltages and currents.

In addition, the post device due to the post rectifiers (7) allows connection in the forward and reverse polarity, regardless of the organization of the workplace welder.

The reliability of a multi-station installation is enhanced by the use of a simple control circuit for a throttle of saturation compared to complex thyristor controllers.

In the proposed multi-post installation, there are no ripple modes on high and medium currents, and on low current modes, by disconnecting one phase, an extended current pulse of the next 100 Hz frequency appears with a reference voltage between the pulse | MI, which favorably affects the welding process.

Claims (1)

Claim ι Multi-station installation for electric arc welding, containing a power transformer connected by a three-phase busbar with individual regulators consisting of a control unit, a rectifier unit and a welding choke, in order to improve the quality of welding by extending the range of regulation welding current and increase the reliability of multi-station installation, individual regulators are supplied with a three-phase saturation throttle, made with a tap from one of the windings, a contactor, with a normally closed and normally open contacts, two diodes and a stabilizing circuit from a series-connected capacitor and a choke, the saturation choke is phase-wise connected to a three-phase busbar and a rectifier unit by two windings directly which is connected to the winding of the inductor of saturation and e the connection point of the anode of the first and the cathode of the second diode, and the cathode of the first diode is connected to a positive terminal, and the second anode with a negative terminal of the rectifier unit, and a stabilizing circuit connected to the output terminals of the individual regulator. 1659180