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为了研究焊接参数(如激光功率、焊接速度)对激光透射焊接塑料强度以及显微结构的影响,采用YAG激光器(功率为300 W,波长为1064 nm)进行聚碳酸酯(PC)材料的激光透射焊接。然后,利用万能材料试验机对焊接后的试件进行拉伸测试,最后利用光学显微镜对焊缝进行微观结构观察,测量焊缝宽度,分析焊缝质量。结果表明,透明PC塑料厚度在1~3.5 mm之间,透射率变化不明显。随着激光能量输入从0.27 J/mm增加到1 J/mm,焊接强度增加;当激光能量输入超过1 J/mm后,焊接强度开始减小。当透明塑料厚度为3.5 mm、激光功率为40 W、焊接速度为40 mm/s时,拉断力可达到峰值1.3 kN。为了提高焊接强度,应严格控制激光能量输入。
In order to study the influence of welding parameters (such as laser power and welding speed) on the strength and microstructure of laser-transmissive welding plastic, the laser transmission of polycarbonate (PC) material was performed with a YAG laser (power of 300 W, wavelength of 1064 nm) welding. Then, the universal testing machine was used to conduct the tensile test on the welded specimen. Finally, the microstructure of the welded joint was observed with an optical microscope, the width of the welded seam was measured, and the quality of the welded seam was analyzed. The results show that the transparent PC plastic thickness between 1 ~ 3.5 mm, the transmittance change is not obvious. As the laser energy input increases from 0.27 J / mm to 1 J / mm, the weld strength increases; when the laser energy input exceeds 1 J / mm, the weld strength begins to decrease. When the transparent plastic has a thickness of 3.5 mm, a laser power of 40 W and a welding speed of 40 mm / s, the breaking force can reach a peak of 1.3 kN. In order to improve the welding strength, laser energy input should be strictly controlled.