激光透射焊接玻纤/聚对苯二甲酸丁二醇酯微观形貌及工艺参数优化

Optimization of Micromorphology and Process Parameters of Laser Transmission Welding Glass Fiber/PolybutyleneTerephthalate

以玻纤/聚对苯二甲酸丁二醇酯(PBT)复合材料为研究对象,开展了激光透射焊接试验。首先利用响应曲面法探究玻纤含量、激光功率和焊接速度对焊接质量的影响,发现玻纤含量和激光功率对焊接质量的交互性影响最小。其次分别对焊接速度和玻纤含量变化下的焊缝拉断面进行了微观形貌观测,发现当玻纤含质量分数为10%时,玻纤和PBT聚合物缠绕紧密;当焊接速度由3 mm/s增加至7 mm/s时,焊缝的鱼鳞纹理现象越发明显。最后通过试验分析分别获得以最大焊接强度和最大焊接速度为目标的最佳工艺参数组合。

In this paper,laser transmission welding experiment was carried out with glass fiber/PBT composites.Firstly,the effects of glass fiber content,laser power,and welding velocity on welding quality were explored by the response surface methodology(RSM),and the interaction effects of glass fiber content and laser power on welding quality were found to be of least significant.Secondly,microscopic morphology observation of welding seam drawing section was implemented under the change of welding velocity and glass fiber content.It was found that when the glass fiber mass content was 1o%,the glass fiber and PBT polymer were tightly wound;when the welding velocity increased from 3 mm/s to 7 mm/s,the fish scale texture of the welding seam became more and more obvious.Finally,the optimal combination of process parameters for maximum welding strength and maximum welding velocity was obtained by experimental analysis.