激光与脉冲MIG复合焊接试验研究

本文研究了YAG激光-脉冲MIG电弧复合焊接铝合金的新工艺,设计制造了复合焊接几头,探讨了各种规范参数对焊缝成型的影响规律及激光与电弧的复合作用。结果表明,在比较宽的参数范围内YAG激光-脉冲MIG复合焊接铝合金焊缝成型美观,无气孔等缺陷,熔深与激光单独焊比增加4倍,与脉冲MIG焊接比增加1倍以上,焊速显著提高,是一种理想的焊接工艺。

Study of YAG Laser-Pulsed MIG Hybrid Welding Process

YAG laser - Pulsed MIG arc hybrid welding process for aluminum alloy has been studied. A welding head for YAG laser- Pulsed MIG arc hybrid welding has been designed and manufactured, which was mounted on the hand arm of an arc welding robot. In order to find out the optimum welding process parameters, the effects of YAG laser power and defocusing distance, the distance between laser bean and arc center, the welding speed and arc current, as well as AC/DC pulse arc on the weld bead formation have been investigated. By means of a high - speed video camera, the behavior of pulsed arc and laser induced plasma plume were observed. The experiment results showed that in a wide range of parameters with YAG laser - pulsed MIG arc hybrid welding for aluminum alloy, the weld formation was very sound. The weld penetration was increased by more than 5 times compared with YAG laser - only, and the welding speed was obviously enlarged compared with MIG- only. It has been proved that the YAG laser- pulsed MIG arc hybrid welding for aluminum alloy is a perfect process.