High-frequency pulse three-wire indirect arc welding method and device

Abstract

The invention belongs to the technical field of welding, and provides a high-frequency pulse three-wire indirect arc welding method and a device. Two high-frequency pulse welding power supplies are adopted to ensure that the total current range is 250 A-600 A; the main wire feeding speed is controlled to be 4 m / min-14 m / min, and the side wire feeding speed is controlled to be 6 m / min-12 m / min; during welding, the two high-frequency pulse power supplies are started at the same time, it is guaranteed that the phases of the two high-frequency pulse power supplies are consistent, when the two high-frequency pulse power supplies are in the pulse peak current, a magnetic field around welding wires has a high compression effect on arc, and at the moment, the arc energy density is high, and the heating effect on base metal is high; when the two high-frequency pulse power supplies are in the pulse background current, although the compression effect of the magnetic field around the welding wireson the arc is weakened, the pulse frequency is high so that arc form compression can be achieved through the high-frequency pulse power supplies, and the arc energy density is improved. According tothe high-frequency pulse three-wire indirect arc welding method and the device, compression of the three-wire indirect arc form is achieved, the three-wire indirect arc energy density is improved, andthe problem that indirect arc heat input is insufficient is solved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a high-frequency pulse three-wire indirect arc welding method and device. Background technique [0002] Different from the traditional welding method, the workpiece of indirect arc welding is not connected to the power supply, and the arc is established between the welding wires; since the welding workpiece is not connected to the power supply, most of the heat generated by the welding power supply is used to melt the welding wire, so indirect arc welding has welding wire deposition The advantage of high efficiency, but the base metal is not connected to the power supply, and the heating of the base metal mainly depends on the heat generated by the arc, which is prone to non-fusion defects, which seriously limits the application of indirect arc welding in actual production. [0003] Aiming at the problem of insufficient heat input of double-wire indirect arc, the invention paten...

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Problems solved by technology

[0004] Aiming at the divergence problem of the three-wire indirect arc form, the invention patent (application number 201811075326.5) proposes a new three-wire indirect arc welding method. The power supply connection method improves the distribution of the magnetic field and electric field around the welding wire, makes the two indirect arcs established by the main wire and the two side wires compound together, improves the energy density of the three-wire indirect arc, and further increases the heat input of the three-wire indirect arc to the base metal. Although this method combines two indirect arcs successfully, one of the welding power sources uses a pulse power source and the other uses an ordinary DC power source. The single pulse power source has limited ability to control the arc shape, and the welding parameter range for stable welding is small.

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