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为了研究激光透射焊接塑料过程中温度分布对焊接显微结构和强度的影响,采用ABAQUS软件,建立了使用激光透射焊接技术焊接聚碳酸酯(PC)的三维有限元热分析模型,通过子程序DFLUX和FORTRAN语言编程实现超高斯型热源的动态加载,有限元分析得到激光透射连接过程中温度场的分布。结果表明:当激光功率P=40 W,焊接速度v=40 mm/s时,焊接温度达到333.8℃,焊接强度最高(1.3 k N),焊接质量最好;当焊接速度v=10 mm/s时,最高温度达到589.5℃,拉伸强度为0.4 k N。当激光功率为40 W,焊接速度为100 mm/s时,焊接温度达到165.5℃,拉伸强度为0.74 k N。焊缝成形的好坏主要与焊接温度有关,可通过选择合适的工艺参数对这些缺陷进行控制。
In order to study the influence of temperature distribution on the microstructure and strength of laser welded plastic during welding, a three-dimensional finite element thermal analysis model of polycarbonate (PC) welded by laser transmission welding technology was established by using ABAQUS software. Through the subroutine DFLUX And FORTRAN language programming to realize the dynamic loading of the super-Gaussian heat source. The finite element analysis obtains the distribution of the temperature field in the laser transmission connection process. The results show that when the laser power is P = 40 W and the welding speed is 40 mm / s, the welding temperature reaches 333.8 ℃ and the welding strength is the highest (1.3 kN). The welding quality is the best when the welding speed is v = 10 mm / s , The maximum temperature reached 589.5 ℃, tensile strength of 0.4 kN. When the laser power is 40 W and the welding speed is 100 mm / s, the welding temperature reaches 165.5 ℃ and the tensile strength is 0.74 kN. Weld forming quality is mainly related to the welding temperature, by selecting the appropriate process parameters to control these defects.