Abstract
The automatic control equipment was developed to control the disturbance in the lay down welding method. It was necessary to keep a constant value of voltage in the range of arc current in which good bead and good penetration coexisted.The arc voltage was regulated by moving the movable core or by means of feed back control system by which the phase of thyristor was controled in the range of proper intensity of current when the variations of arc voltage and arc current was detected by means of a meter relay.
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