| Laser-arc hybrid welding is with a concentration of energy, high welding speed, low deformation characteristics and so on. Based on summarization of the current researches on hybrid welding technique, a program of experimental work was undertaken to investigate the hybrid laser-MAG welding process and its application.This paper uses the Nd:YAG laser-MAG paraxial hybrid welding, which is used to study the relationship of welding process parameters, for example, the laser power, the welding current, the arc voltage, welding speed, different ratio of power with appearance of weld, droplet transfer, the electrical signal, the discussion of the interaction between the laser and the arc. Experiments indicate that, so with under certain and conditions of welding, the arc power mainly affects the weld width, the laser power is the main effect of the composite weld penetration, the laser and arc guide and compression effect are beneficial to increase the weld penetration, and to reduce the weld width, so that the on optimal process parameters are achieved; when the laser power is2.5kW,180A is the required welding current; and the welding speed at1.2-1.4m/min, so the better appearance is visible. The laser and arc coupling effect is in the best state, weld reinforcement shape coefficient in stability, droplet transfer and the electrical signal are in stability.Other experimental results indicate that:the laser-MAG hybrid welding improves welding efficiency and owns good welding adaptability. Laser-arc hybrid is able to implement nicer bridging; the hardness of weld bead is lower than that of laser, and has a good uniform. |
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