激光无吸收剂透射焊接透明PET塑料试验研究

Study on Absorber-free Laser Transmission Welding of Transparent PET Plastic

使用1 710 nm半导体激光器,对同种透明聚对苯二甲酸乙二醇酯(PET)塑料进行激光透射焊接,由于透明PET塑料对1.7μm的激光具有较高吸收率,因此焊接过程无需添加激光吸收剂。通过调整激光功率和焊接速度,探讨了线能量对焊接强度的影响。在激光功率为10 W,焊接速度为7.5 mm/s时,得到了美观牢固的焊接试件,此时的线能量为1.33 J/mm。保持此线能量不变,在激光功率为5~30 W的范围内设计了对比试验。结果表明,激光功率在5~30 W、焊接速度在3.75~22.50 mm/s内改变对焊接试件的焊缝强度影响较小。

The same transparent polyethylene terephthalate(PET) plastic was welded by laser transmission welding using the 1 710 nm diode laser. Because the transparent PET plastic has a high absorption rate for 1.7 μm laser, there is no need to use laser absorber in the welding process. The influence of energy input on welding strength was discussed by adjusting laser power and welding speed. When the laser power is 10 W and the welding speed is 7.5 mm/s, the aesthetic and strong welding parts are obtained with the energy input is 1.33 J/mm. Keeping this energy input constant, a comparative experiment was designed by changing laser power in the range of 5-30 W. Results show that the change of laser power(5-30 W) and welding speed(3.75-22.50 mm/s) has little effect on the weld strength of the welding specimen.