INFLUENCES OF Nd: YAG LASER + PULSED MAG ARC HYBRID WELDING PARAMETERS ON WELD
PENETRATION

QIN Guoliang^{1, 2}  QIN Guoliang¹  WANG Xuyou¹  LIN Shangyang¹

(1. Harbin Welding Institute, Harbin 150080;

2. School of Material Science and Engineering,

Harbin Institute of Technology, Harbin 150001 )

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 parameter of hybrid welding. Hybrid weld penetration can get to the maximum at 0~3 mm in laser-arc distance and 2 mm of defocusing distance. For different welding current the laser-arc distance will be different when hybrid weld penetration is up to its maximum. Analyses and comparisons of the experimental results indicate that laser power can decide hybrid weld penetration 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

CLC No: TG456.7

Received 20060130,  received in revised form 20060722