激光透射焊接塑料技术凭借其优良的焊接性能, 广泛应用于医疗、电子、汽车和包装等领域。目前工业上, 为提高塑料制品的使用性能, 掺杂玻璃纤维是改性塑料的一个重要方式。然而, 掺杂玻璃纤维会导致塑料的透光性大幅下降, 不合适的焊接工艺极易导致焊接缺陷。针对这一问题, 开展激光透射焊接掺杂玻璃纤维ABS和PP塑料的工艺研究, 旨在获得最佳的焊接工艺。首先, 根据激光透射焊接的原理, 指出焊接掺杂玻璃纤维ABS和PP塑料的工艺难题; 其次, 对掺杂玻璃纤维ABS和PP塑料进行初步焊接, 获得适合的焊接工艺参数范围; 随后, 设计田口实验, 提出面能量概念, 综合分析工艺参数对剪切强度的影响规律。实验分析发现, 提出的面能量概念能够较好地描述焊缝剪切强度与工艺参数之间的关系, 此外, 得出激光透射焊接掺杂玻璃纤维ABS和PP塑料的最佳面能量为0.43 J/mm2。

Laser transmission welding is widely used in medical, electronics, automobile and package fields due to its excellent welding performance. At present, fiberglass-doped is an important method of modified plastic for improving the usability of plastic products. However, fiberglass-doped method can contribute to a sharp decline in plastic laser transmittance, and it presents a technology difficulty for laser transmission welding. To solve this problem, a technology study of laser transmission welding of fiberglass-doped ABS and PP is carried out in order to obtain the best welding process. Firstly, according to the mechanism of laser transmission welding, the process problems of welding fiberglass-doped ABS and PP are pointed out. Secondly, the preliminary welding experiment of fiberglass-doped ABS and PP is implemented to obtain the suitable scope of welding process parameters. Then, the Taguchi experiment is accomplished to analyze the effects of process parameters on shear strength through proposing the concept of laser energy per unit of area. The experiment analysis shows that the laser energy per unit of area can well describe the relationship between weld shear strength and process parameters. Besides, the optimal laser energy per unit of area for welding fiberglass-doped ABS and PP is 0.43 J/mm2.