红外加热辅助激光透射焊接异种聚合物

异种相容聚合物因温度属性差异导致焊接效果不佳,为提高其激光透射焊接强度,采用了在激光透射焊接时辅助使用红外加热灯加热具有较高熔融温度的上层材料而改善焊接强度的新方法。从光学属性、温度属性、相容性和上层材料吸热测试4个方面对可焊性进行了理论和实验分析;采用响应面法进行工艺参量优化,取得了最佳工艺参量组合;使用3维显微镜研究了焊件断面形貌及失效形式,并分析了焊缝处气泡对焊接性能的影响。结果表明,使用红外加热灯辅助焊接的最大剪切力能达到激光直接透射焊接时的1.5倍左右。红外加热灯的辅助加热作用是有效解决异种聚合物因温度属性差异大而导致焊接效果不理想问题的一种新途径。

Laser transmission welding of heterogeneous polymers assisted by infrared heating

The welding effect of heterogeneous compatible polymers was poor due to the difference of temperature properties. In order to improve the laser transmission welding strength, laser transmission welding assisted by infrared heating lamp to heate superstructure material with high melting temperature was used. The welding ability was analyzed theoretically and experimentally from four aspects:optical property, temperature property, compatibility and heat absorption test of upper layer material. Response surface methodology was used to optimize process parameters and the optimum combination of process parameters was obtained. A 3-D microscope was used to study the fracture morphology and failure modes of weldments. The effect of air bubbles on the welding ability was also analyzed. The results show that the maximum shear force of the welding with infrared heating lamp can reach about 1.5 times of that without infrared heating lamp. The assistance of infrared heating lamp can effectively solve the problem that the welding effect of heterogeneous polymers is not ideal because ofgreat difference of temperature attributes.