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为研究聚碳酸酯激光透射焊接接头性能,采用10W半导体端抽运全固态(DPSS)激光器进行了聚碳酸酯材料的激光透射焊接。采用光学金相显微镜(OM)、场发射扫描电子显微镜(SEM)和电子万能实验拉力机分析了接头的显微形貌、断口形貌和拉伸剪切强度。结果表明,在激光功率8 W、激光频率50kHz、焊接速度350mm/s、激光扫描间距0.1mm时,试样的拉伸剪切强度达到44MPa,为母材强度的68%,焊缝内部的分层和气孔是影响接头力学性能和断裂机制的主要原因,通过激光塑料透射焊接技术,可以获得接头力学性能良好的焊接试样。
In order to study the performance of polycarbonate laser transmission welded joints, laser transmission welding of polycarbonate was carried out by using 10W semiconductor end-pumped solid-state (DPSS) laser. The microstructure, fracture morphology and tensile shear strength of the joints were analyzed by optical microscope (OM), field emission scanning electron microscope (SEM) and electronic universal tensile testing machine. The results show that the tensile shear strength of the sample reaches 44MPa at the laser power of 8 W, the laser frequency of 50 kHz, the welding speed of 350 mm / s and the laser scanning pitch of 0.1 mm, which is 68% of the strength of the base metal. Layers and pores are the main factors that affect the mechanical properties and fracture mechanism of the joint. Laser welding can be used to obtain the welded specimens with good mechanical properties.