基于铝粉吸收剂的聚碳酸酯激光透射焊接研究

Study on Laser Transmission Welding of Polycarbonate Based on Aluminum Powder Absorber

铝粉因其良好的热物理性能可作为激光焊接吸收剂,但是铝的高反射率,需掺入炭黑来提升吸收剂的吸光性能。本文应用半导体激光器对含铝粉吸收层的聚碳酸酯进行了激光透射焊接实验,以吸收剂不同铝粉含量为主要因素,结合激光功率、焊接速度采用正交水平法研究了焊接工艺参数对焊接强度的影响,对焊接工艺参数进行了优化。得到了最佳工艺参数,重点分析了不同铝粉含量吸收剂对焊缝形貌和连接强度的影响。实验结果表明,吸收剂铝粉含量为40wt%,焊接功率为35 W,焊接速度为4 mm/s时,拉断力最大,焊接强度最高。

Aluminum powder can be used as a laser welding absorbent because of its good thermal physical properties, but the high reflectivity of aluminum needs to be incorporated into carbon black to enhance the absorption performance of the absorbent. In this paper, the laser transmission welding experiment of polycarbonate with aluminum powder absorption layer was carried out by using semiconductor laser. The main factors of different aluminum powder content of absorbent were combined. The welding process parameters were welded by orthogonal level method in combination with laser power and welding speed. The influence of the strength was optimized for the welding process parameters. The optimum process parameters were obtained, and the effects of different aluminum powder content absorbents on the weld morphology and joint strength were analyzed. The experimental results show that the aluminum powder content of the absorbent is 40 wt%, the welding power is 35 W, and the welding speed is 4 mm/s, the breaking force is the largest and the welding strength is the highest.