AUTOMATIC WIRE FEED SPEED UNIT AND ITS CONTROL IN A WELDED SEMI-AUTOMATIC WELDING MACHINE

摘要

FIELD: machine building.;SUBSTANCE: invention relates to welding equipment. Welding semiautomatic device comprises a welding current source, welding wire feed mechanism including an electric motor, electronic bridge circuit and output stage of the motor supply, stabilized voltage source and wire feed speed adjustment element. At that, it is equipped with a setting timer connected to the stabilized voltage source, switching elements and series connected by an arc-breaking sensor, arc-breaking pulse generator, arc-breaking amount counter, decoder, stepped resistive potentiometer and voltage multiplier, which output is connected to the electronic bridge circuit, wherein the setting timer of its input is connected to the arc-breaking pulse former and the output to the arc-breaking amount counter with the possibility of blocking the signal passage to the counter, wherein a stepwise resistive potentiometer is connected through a series-connected wire feed rate adjustment element and corresponding switching elements to the stabilized voltage source and welding current source with possibility of supply of the electric motor of a welding wire feed mechanism from the welding current source with provision of automatic adjustment of welding wire feed speed.;EFFECT: use of invention allows retaining preset length of arc without breakage, which improves welding quality.;1 cl, 1 dwg