Abstract: The influences of Nd：YAG laser+pulsed MAG arc hybrid welding parameters on weld penetration are investigated by experiments. The results show that hybrid weld penetration increases with the increases of arc power and laser power, while decreases with welding speed being increased. Hybrid weld penetration is slightly deeper than that of laser welding and much deeper than that of pulsed MAG welding for the same welding parameters. Laser-arc distance is an important parame-ter of hybrid welding. Hybrid weld penetration can get to the maximum at 0~3 mm in laser-arc distance and 2 mm of defo-cusing distance. For different welding current the laser-arc dis-tance will be different when hybrid weld penetration is up to its maximum. Analyses and comparisons of the experimental re-sults indicate that laser power can decide hybrid weld penetra-tion and greatly improve hybrid welding speed, and pulsed MAG arc can improve the heat efficiency of laser welding.

Key words: Hybrid welding, Laser welding, Pulsed MAG welding, Weld penetration, Welding parameters