SU1648662A1 - Welding unit - Google Patents

Description

one

(21) 4336117/27 (22) 03.12.87 (46) 05/15/91. Bul №18 (75) N.I. Sysoev (53) 621.791.75 (088.8)

(56) Arc Welding Equipment Reference Manual / Ed. V.V. Smirnov. L .: Energoatomizdat, Leningrad Branch. 1986, p. 188. (54) WELDING DEVICE (57) The invention relates to the metalworking industry and is intended for pulsed arc welding with melting electrodes. The purpose of the invention is to enhance the functionality and increase the efficiency of the device by providing pulse-arc welding with melting electrodes with two posts. The device contains a single-phase welding transformer, to the output of which a full-wave thyristor rectifier consisting of two thyristors and two diodes is connected. The combined diodes of the diodes are the negative terminal of the device to which the products to be welded are connected. A ballast resistor, two smoothing chokes and two additional diodes are entered into the device. During the production of welding by two posts, the formation of current pulses, following with a frequency of 50 Hz, of each post occurs in opposite half-periods of the mains voltage, as a result of which their mutual influence is excluded. 1 il.

The invention relates to pulse-arc welding with a melting electrode and is intended for use in the metalworking industry.

The purpose of the invention is to enhance the functionality and increase the efficiency of the device by providing pulse-arc welding with fused electrodes to two bridges.

The drawing shows a circuit diagram of the power section of the welding device.

The welding device contains a single-phase welding transformer 1, a full-wave thyristor rectifier consisting of diodes 2, 3 and thyristors 4, 5, forming a pulse current, is connected to the output. The cathodes of thyristors 4 and 5 are connected to a ballast rheostat 6. Anodes of thyristors 4, 5 connect CO

with

respectively, with the anodes of diodes 7, 8, and the cathodes of the latter through chokes 9, 10 are connected to thyristors 4, 5 (with their cathodes). The common points 11,12 of the connections of the chokes 9, 10 with the thyristors 4, 5 are connected through the ballast resistor 6 and at the same time each point is the positive terminal for connecting the devices 13, 14 for welding the corresponding posts. The welded products 15 and 16 are connected to the negative terminal 17 of the device, which is formed by the combined anodes of the diodes 2 and 3.

The welding device operates as follows.

In the production of welding by two posts, the formation of current pulses, following with a frequency of 50 Hz, of each welding station occurs in opposite half-periods of the mains voltage, due to

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oh oh

which eliminates the mutual influence of posts. The device implements a phase method of current pulse separation. The effect through the ballast rheostat 6, the resistance of which is relatively large and chooses, on the basis of maintaining the required level of a small base current, can be neglected. Smoothing inductors 9, 10 together with the ballast rheostat 6 in the absence of current pulses, following through the thyristors 4, 5, support the base current at the required level. Diodes 7, 8 eliminate the mutual influence of welding stations.

Compared to the basic prototype object, the use of the proposed welding device will allow pulsed arc welding with two electrodes by two posts from one single-phase welding transformer using one full-wave thyristor rectifier with relatively small changes in the circuit. will have a significant economic effect.

2208

Claims (1)

Invention Formula Welding device comprising a welding transformer is single-phase, full wave thyristor to vyhodukotorogopodsoedinen rectifier and a first smoothing choke of m- lichayuschees in that, in order to expand the functional capabilities by providing a pulsed arc welding electrode melting schimis two posts, is provided with a ballast rheostat, the second smoothing choke and two additional diodes, and the thyristor rectifier is made of two diodes and two thyristors, each of the additional diode the anode is connected to the anode of one of the thyristors, and the cathode through one of the smoothing chokes with the cathode of the same thyristor, while the cathodes of the thyristors are connected to each other via a ballast rheostat, and through the arc gaps of the corresponding post of the thyristor rectifier .