High-power twin-wire double-pulse MIG welding power supply system with adjustable high-and-low-frequency pulse phases and control method thereof

Abstract

The invention discloses a high-power twin-wire double-pulse MIG welding power supply system with adjustable high-and-low-frequency pulse phases and a control method thereof. The power supply system comprises an STM32 human-computer interface module, a host power supply and a slave power supply, wherein the STM32 human-computer interface module is connected to DSP digital synchronic control modulesin the host power supply and the slave power supply; the host power supply provides current for a previous wire; the slave power supply provides current for a latter wire; and the host power supply,as well as the slave power supply, consists of two parallel main circuits and a control circuit. The power supply system can realize seven high-and-low-frequency pulse phase modes; two host and slavelow-frequency modulation double phases act on a high-power twin arc for double-wire melt dripping to arouse resonance of a molten pot; the temperature gradient of a temperature field of the molten potis optimized; double-arc interference is reduced; and the welding stability is improved, the weld microstructure is optimized, and the weld forming quality is improved.

Description

technical field [0001] The invention relates to the technical field of high-efficiency welding, in particular to the technical field of high-power twin-wire pulse MIG welding, in particular to a high-power twin-wire double-pulse MIG welding power supply system with adjustable high and low frequency pulse phases and a control method thereof. Background technique [0002] As an important support point for welding technology innovation, high-efficiency welding is mainly reflected in improving the deposition efficiency and improving the quality of welded joints when welding thick plates. The key to realizing high-efficiency welding is to further increase the welding current. High-power twin-wire pulse MIG welding is one of the main methods of high-efficiency welding. It has obvious advantages over traditional twin-wire pulse MIG welding. The large current output by the welding power supply (pulse peak current greater than 630A) acts on the welding wire, and the master-slave The...

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Problems solved by technology

[0005] (1) High-power twin-wire pulse MIG welding has a large heat input to the material, which causes coarse grains in the weld zone and heat-affected zone, which seriously reduces the toughness of the material. Some structures need to be heat treated after welding, which limits their application.

[0006] (2) High-power twin-wire pulse MIG welding Because the distance between the twin-wires is relatively close, if the current law in conventional twin-wire welding is applied to high-current twin-wire welding, that is, the two-way pulse current of twin-wire welding is simply increased. , then the magnetic field generated by the current will increase accordingly, which will increase the interaction force of the double arcs, resulting in serious double arc interference. The process is unstable, and the ideal high-efficiency welding process cannot be realized. The welding effect is worse than conventional twin-wire pulse MIG welding below 630A, even worse than single-wire pulse MIG welding, and cannot reflect the advantages of high-power twin-wire welding.

However, the power supply system is designed for the three phases of high-frequency pulses. When the system is working, the master and slave machines output strong pulses and weak pulses at the same time, and the low-frequency phase and high-frequency phase cannot be adjusted independently at the same time.

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