Laser and arc compound welding method

Abstract

The invention discloses a laser and arc compound welding method which comprises the following steps: (1) activating pulse laser and controlling a synchronous pulse signal; (2) activating an alternating current arc, and carrying out pulse laser-alternating current arc compound welding; and (3) in a welding process, adjusting the arc current to 40-500 A, the laser pulse peak value power to 1-6 KW, the basic value power to 200-1000 W, the laser pulse frequency to 10-100 Hz, the distance Dla between a laser impact point to the center of an arc molten bath to 1-6 mm and the distance from the tip ofan electrode to a workpiece to 1-5 mm till welding is finished. By coordination control between the pulse laser and alternating current arc negative half-wave regions, the arc stability can be improved, the surface forming of a welding region can be improved, and depth of fusion is increased by 1-2 times; by enhancing discharge in the alternating current arc negative half wave region by pulse laser, influence of processing parameters and environmental factors to welding stability can be reduced while the arc stability in a high speed condition is improved.

Description

technical field [0001] The invention relates to the technical field of material processing engineering, in particular to a laser and arc hybrid welding method. Background technique [0002] At present, in the field of research and application of laser-arc hybrid welding, the combination of continuous laser or pulsed laser and arc is basically used. During laser arc hybrid welding, the laser and the arc act on the common area. At this time, the laser and the arc interact, that is, there is a matching relationship in which the energy of the two strengthens and weakens each other. Generally speaking, the laser has a stable effect on the arc, but when the laser and the AC arc are combined, when the welding speed is high, although the interaction between the laser and the arc can stabilize the arc, there will still be insufficient local thermal electron emission, and the arc will produce Drift, expansion phenomenon. People hope to improve the stability of the high-speed welding...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiency of the existing laser-AC arc hybrid heat source welding method in high-speed welding, the present invention proposes a pulse laser and AC arc hybrid welding method, which solves the problem of the existing laser-arc hybrid welding technology in high-speed welding. A series of problems caused by the insufficient local thermionic emission of the arc and the absorption of laser energy and beam scattering by the arc plasma

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