Welding Method of Laser-Low Current Welding Wire Spontaneously Induced Arc Hybrid Welding System

Abstract

A laser-low current welding wire autonomous induction electric arc composite welding system comprises a laser head, a wire feeding mechanism, a welding wire, a shielding gas device, a constant-voltagecharacteristic power source and an electric arc control center. The wire feeding mechanism comprises an annular electrode suitable for a narrow gap, an electric conduction wire feeding wheel and a wire feeding mouth. In the welding process, the constant-voltage characteristic power source outputs a low current, the wire feeding mechanism feeds in a wiring wire, the welding wire autonomously induces an electric arc on the surface of a to-be-welded workpiece, the electric arc and a laser beam generated by the laser head are recombined, and welding is conducted. The electric arc control center monitors the magnitude of an electric current of an electric circuit in the welding process in real time through the constant-voltage characteristic power source, and the welding wire feeding action ofthe wire feeding mechanism and an output current of the constant-voltage characteristic power source are adjusted according to the magnitude of the electric current so as to maintain electric arc stability. According to the welding system, the electric arc can be introduced into a highly constrained space of the welding process of large thick plate and an ultra-narrow gap, the electric arc and alaser generate a synergetic enhancement effect, and advantages of laser electric arc composite welding and laser filler wire welding are combined.

Description

technical field [0001] The invention relates to a welding method of a laser-low current welding wire spontaneously induced arc composite welding system, which belongs to the field of welding technology. Background technique [0002] At present, based on the problem of laser welding of aluminum alloys, the use of laser arc hybrid welding can improve the laser absorption rate and bridging ability, and suppress the welding defects of aluminum alloys. However, the laser arc hybrid welding technology is limited by the size of the welding torch, and it is only suitable for plates with a thickness of less than 20mm. Welding, it is difficult to adapt to ultra-narrow gap welding of large thick plates with a thickness of more than 20mm. [0003] Although the use of laser wire filler welding can adapt to the ultra-narrow gap welding of large and thick plates, due to the small range of welding process parameters, the welding efficiency is lower than that of hybrid welding, and defects s...

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Problems solved by technology

[0002] At present, based on the problem of laser welding of aluminum alloys, the use of laser arc hybrid welding can improve the laser absorption rate and bridging ability, and suppress the welding defects of aluminum alloys. However, the laser arc hybrid welding technology is limited by the size of the welding torch, and it is only suitable for plates with a thickness of less than 20mm. Welding, it is difficult to adapt to ultra-narrow gap welding of large thick plates with a thickness of more than 20mm

[0003] Although the use of laser wire filler welding can adapt to the ultra-narrow gap welding of large and thick plates, due to the small range of welding process parameters, the welding efficiency is relatively low compared with hybrid welding, and defects such as lack of fusion are prone to occur

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