Process characteristics of laser scanning welding of aluminum alloy

In order to reduce welding defects and improve the stability of the welding process during 6061 aluminum alloy laser welding, the high power solid state laser weaving welding technology was developed. The results showed that the higher quality welding seam could be obtained when the weaving range was 0.5 ~ 0.7 mm and the weaving frequency was 100 ~ 200 Hz. Laser weaving welding could significantly inhibit the generation of plasma and its size was 2/3 of the conventional laser welding, its area standard deviation was 1/2 of the conventional laser welding. Compared with the conventional laser welding technology, laser weaving welding could maintain a stable molten pool shape, where the keyhole moved steadily along the counter clockwise direction, and the keyhole area was about twice of the conventional laser welding.