Infrared observations and finite element modeling of a laser transmission welding process
Infrared observations and finite element modeling of a laser transmission welding process
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激光透射焊接过程的红外观测和有限元建模
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
P. Bates
中科院分区：
文献类型：
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作者：
L. S. Mayboudi;A. M. Birk;G. Zak;P. Bates
激光传输焊接(LTW)是一种连接热塑性塑料部件的技术，它涉及激光通过激光传输部分，然后在焊接界面被激光吸收部分吸收的过程。为了形成牢固的粘结，重要的是焊接界面要暴露在足够的热量下，以熔化聚合物而不使其降解。研究了搭接接头的几何结构，并使用热成像相机观察了静止激光光束与塑料之间的相互作用。对相机观察到的几种表面涂层进行了评价。得到了横穿接头界面的试件表面的时间历程和温度分布。发现碳烟涂层表面对散射激光的响应而升温，这为估计散射光强度提供了手段。利用商用有限元求解器对LTW焊接过程进行了三维数值模拟。该热模型详细地研究了激光焊接过程中的加热和冷却阶段，包括激光光束轮廓和激光在半晶材料中散射的影响。激光传输焊接(LTW)是一种连接热塑性塑料部件的技术，它涉及到一束激光穿过激光传输部分，然后在焊接界面被激光吸收部分吸收。为了形成牢固的粘结，重要的是焊接界面要暴露在足够的热量下，以熔化聚合物而不使其降解。研究了搭接接头的几何结构，并使用热成像相机观察了静止激光光束与塑料之间的相互作用。对相机观察到的几种表面涂层进行了评价。得到了横穿接头界面的试件表面的时间历程和温度分布。发现碳烟涂层表面对散射激光的响应而升温，这为估计散射光强度提供了手段。利用商用有限元求解器对LTW焊接过程进行了三维数值模拟。该热模型描述了激光焊接过程中的加热和冷却阶段。
Laser transmission welding (LTW), a technique to join thermoplastic components, involves a laser beam passing through a laser-transmitting part and then being absorbed by the laser-absorbing part at the weld interface. To form a strong bond, it is important that the weld interface be exposed to sufficient heat to melt the polymer without degrading it. A lap-joint geometry was investigated and the interaction between a stationary laser beam and the plastic was observed using a thermal imaging camera. Several coatings on the surface observed by the camera were evaluated. Time histories and temperature distribution on the sample surface transverse to the joint interface were obtained. Soot-coated surface was found to heat up in response to the scattered laser light, providing means for estimation of the scattered light intensity. The LTW welding process was modeled in three dimensions using a commercial finite element solver. This thermal model addresses the heating and cooling stages in a laser welding process in detail, including the effects of laser beam profile and laser beam scattering in a semicrystalline material. The model matched well the temperature distributions obtained by thermal imaging observations on the laser-absorbing part.Laser transmission welding (LTW), a technique to join thermoplastic components, involves a laser beam passing through a laser-transmitting part and then being absorbed by the laser-absorbing part at the weld interface. To form a strong bond, it is important that the weld interface be exposed to sufficient heat to melt the polymer without degrading it. A lap-joint geometry was investigated and the interaction between a stationary laser beam and the plastic was observed using a thermal imaging camera. Several coatings on the surface observed by the camera were evaluated. Time histories and temperature distribution on the sample surface transverse to the joint interface were obtained. Soot-coated surface was found to heat up in response to the scattered laser light, providing means for estimation of the scattered light intensity. The LTW welding process was modeled in three dimensions using a commercial finite element solver. This thermal model addresses the heating and cooling stages in a laser welding proc...