基于混合激光系统的自动化激光微焊接技术及应用

Technology and application of automatic laser micro welding technology based on hybrid laser system

为了实现轻量化的目标,电子产品和汽车行业越来越多的使用铝合金材料。主要研究混合激光系统微焊接技术。焊接试验装置由一个脉冲YAG激光和连续激光二极管(以下简称LD)组成。其原理是:波长为1 064 mm的YAG脉冲和中波长808 nm的连续LD脉冲激光叠加在同一光轴,再通过光纤传送到激光加工头。在连续LD激光的能量下,焊缝的宽度和深度逐渐增加,实现高速条件下的连续焊接。

The welding of aluminum alloy is widely used for light weight of electronic products and automobiles. The automatic laser micro welding technology based on hybrid laser system is studied in this paper. A hybrid laser system which consists of a pulsed Nd：YAG laser and a continuous laser diode（LD）is developed to perform the high efficiency and high quality welding of aluminum alloy. A pulsed Nd：YAG laser with wave length of 1064 nm and a continuous LD with wave length of 808 nm are superposed on the same beam axis,and the superposed laser beams of two wavelengths are delivered to the processing head through an optical fiber. With the power of continuous LD, the bead width and depth gradually increase to realize the continuous welding even under a condition of high speed.