Arc start and arc withdrawal control method for double-wire serial submerged arc welding

Abstract

The invention relates to an arc start and arc withdrawal control method for double-wire serial submerged arc welding, comprising the following steps: starting a master welding power source (PA) and a travelling mechanism (TR) firstly at the arc start time, at which a master wire feeder (FA) feeds a wire slowly; using an arc starting current supplied by the master welding power source at an arc starting position (B) to make a front welding wire (Wf) produce the arc, at which the master welding power resource automatically switches to a stable welding current and the slow-speed wire feeding turns to be normal-speed wire feeding; after shifting a rear welding wire (Wb) to the art starting position, starting a slave welding power source (PB) and a slave wire feeder (FB) to feed the wire slowly; using the arc starting current supplied by the slave welding power source at the arc starting position to make the rear welding wire produce the arc, at which the slave welding power source automatically switches to the stable welding current and the slow-speed wire feeding turns to be the normal-speed wire feeding; stopping the master wire feeder firstly at an arc withdrawing position (C) at the arc withdrawal time, delaying the master welding power source for a certain time and then stopping the master welding power source; and after shifting the rear welding wire to the arc withdrawing position, stopping the slave wire feeder and the travelling mechanism firstly, delaying the salve welding power source for a certain time and then stopping the salve welding power source. The control method of the invention can avoid a small section of a narrow gap at the head and the tail of a weld seam, reduce the phenomenon that the weld seam is collapsed at the arc withdrawing position, prevent weld seam defects, and obtain good forming quality of the weld seam.

Description

Technical field [0001] The invention relates to a double-arc high-speed submerged arc welding process control method, in particular to a double-wire tandem submerged arc welding arc starting and ending control method, belonging to the technical field of high-speed submerged arc welding quality control. Background technique [0002] The submerged arc welding process includes three stages: ignition arc, welding and arc extinguishing. For ignition arc, the general requirement is to short-circuit the welding wire and the weldment. After the welding machine is started, the arc is ignited by slow wire feeding; after the arc is ignited, the walking mechanism does not move. After the arc is stable, the welding function is required Automatically perform welding according to pre-selected welding process parameters such as welding current, arc voltage, welding speed, etc., and can ensure that these parameters are stable throughout the welding process; at the end of welding, the welding mach...

AI Technical Summary

Problems solved by technology

At present, this phenomenon exists in the twin-wire tandem eutectic pool submerged arc welding seams, because the twin-wire submerged arc welding equipment used adopts analog control, and the two welding wires lack corresponding timing or coordinated control for arc starting and arc closing

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