SU619307A1 - Welding generator current modulating device - Google Patents

Description

(54) DEVICE FOR MODELING WELDING CURRENT GENERATOR

The invention relates to the field of welding production equipment, in particular, to electric arc welding with modulated current. A device for electric arc welding with modulated current, containing an electronic time relay controlling a welding cycle, and an actuating relay closing and opening an independent generator exciter winding connected to an AC network through a step-down transformer with an adjustable output voltage to control the pulse current and pause, and bridge rectifier. A disadvantage of the known device is the limited field of application, since it can be used with only generators with independent excitation. The aim of the invention is to obtain the possibility of working with generators having as independent. So parallel excitement. The goal is achieved by the fact that the proposed device is equipped with an initial excitation circuit, the input of which is connected to the output of the welding cycle control circuit, and the output is connected to the input of the pulse current and pause control circuit. FIG. 1 is a block diagram of a device connected to a parallel excitation generator; in fig. 2 - the same connected to the independent excitation generator. A device for modulating the current of the welding power generator contains a series-connected welding cycle control circuit 1, a generator initial drive circuit 2 and a pulse and power current control circuit 3 connected in parallel to the drive generator 4 of the welding generator 5 and actuator 6 connected in parallel to the circuit 3 pulse current and pause control. A device for modulating a current with parcel excitation generators operates as follows. When connected to the medium and negative brushes of the generator 5, the device is powered in the event that the initial excitation of the generator 2 begins to work, which causes the generator to initial excitation using its residual magnetization.

With the appearance of a voltage voltage across the brushes of the generator 5, a sequence of rectangular pulses of a given duty cycle from the output cxeNU of the welding cycle control is fed to the initial generator excitation circuit 2, which finally excites the welding generator 5, and also serves as a conductor of these pulses to the circuit 3 adjusting the current pulse and pause, by delimiting the current pulse and pause at a given level. From the output of the pulse current regulating circuit 3 and the pause signal goes to the actuator b, made on the triode, which is an adjustable resistance connected in series with the excitation winding 4 of the welding generator 5, which regulates the excitation winding current and hence the generator output power.

A device for modulating a current with independent excitation generators, connected1) parallel to series-connected actuator 6 and excitation winding 4 of welding generator 5, works in the same way as parallel excitation generators, only the generator 2 initial excitation circuit serves as a pulse conductor with cross-section & In the 1 welding cycle control to the pulse current and pause control circuit 3, it has wiped its functions of excitation, which are not needed, into its functions.

The proposed device for modulating the current of the welding generator greatly expands its field of application, making it possible to use it with generators of various types of both independent and parallel excitation, which is especially important in route conditions of welding. The device is working, connected to the koryu generator ASB-300,

Claims (1)

1. Wagner F.A. Manual arc welding with pulsating arc, Welding (u) production, 3, 1970, p. 21-22. fut.f one nd