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Laser transmission welding of absorber-free semi-crystalline polypropylene by using a quasi-simultaneous irradiation strategy
Welding in the World ( IF 2.4 ) Pub Date : 2020-05-13 , DOI: 10.1007/s40194-020-00913-3
Nam-Phong Nguyen , Stefan Behrens , Maximilian Brosda , Alexander Olowinsky , Arnold Gillner

Unlike other joining techniques, laser transmission welding offers unique advantages such as selective and contactless energy deposition. This enables the fabrication of flexible seam geometries at low mechanical and thermal stresses. However, the use of absorbing additives for the lower joining partner such as carbon black is crucial as most polymers are transparent in the spectral range of typical beam sources (800–1100 nm). A novel approach is the application of beam sources emitting radiation within the polymeric intrinsic absorption bands between 1500 and 2000 nm. This enables absorber-free laser welding of transparent polymers for medical or microfluidic applications such as Lab-on-a-Chip devices. The main drawback on the other hand is the large heat affected zone (HAZ) due to the volume absorption which is extending over the entire cross section. A possible way to overcome this disadvantage is a quasi-simultaneous irradiation strategy. It could be proved in the past that the HAZ of polycarbonate (PC) can be reduced in the vertical direction by up to 30% compared with contour welding. Since the effects of light scattering on the absorber-free quasi-simultaneous irradiation strategy are still unknown, the beam propagation was simulated in polypropylene (PP). Based on the results, a thermal simulation of the welding process was carried out using the finite element method (FEM). The simulation model was then evaluated by comparing the results with experimental trials.

中文翻译:

无吸收剂半结晶聚丙烯的准同时辐照激光透射焊接

与其他连接技术不同,激光透射焊接具有独特的优势,例如选择性和非接触式能量沉积。这使得能够在低机械应力和热应力下制造柔性接缝几何形状。但是,将吸收性添加剂用于较低的连接伙伴(例如炭黑)至关重要,因为大多数聚合物在典型光束源(800-1100 nm)的光谱范围内都是透明的。一种新颖的方法是应用在1500至2000 nm的聚合物固有吸收带内发射辐射的束源。这样就可以在医疗或微流体应用(如芯片实验室)上进行无吸收剂的透明聚合物激光焊接。另一方面,主要缺点是由于体积吸收在整个横截面上延伸而导致的大的热影响区(HAZ)。克服此缺点的一种可能方法是准同时照射策略。过去可以证明,与轮廓焊接相比,聚碳酸酯(PC)的热影响区在垂直方向上最多可减少30%。由于光散射对无吸收体准同时辐照策略的影响仍然未知,因此在聚丙烯(PP)中模拟了光束的传播。根据结果​​,使用有限元方法(FEM)对焊接过程进行了热模拟。然后通过将结果与实验试验进行比较来评估仿真模型。克服此缺点的一种可能方法是准同时照射策略。过去可以证明,与轮廓焊接相比,聚碳酸酯(PC)的热影响区在垂直方向上最多可减少30%。由于光散射对无吸收体准同时辐照策略的影响仍然未知,因此在聚丙烯(PP)中模拟了光束的传播。根据结果​​,使用有限元方法(FEM)对焊接过程进行了热模拟。然后通过将结果与实验试验进行比较来评估仿真模型。克服此缺点的一种可能方法是准同时照射策略。过去可以证明,与轮廓焊接相比,聚碳酸酯(PC)的热影响区在垂直方向上最多可减少30%。由于光散射对无吸收体准同时辐照策略的影响仍然未知,因此在聚丙烯(PP)中模拟了光束的传播。根据结果​​,使用有限元方法(FEM)对焊接过程进行了热模拟。然后通过将结果与实验试验进行比较来评估仿真模型。由于光散射对无吸收体准同时辐照策略的影响仍然未知,因此在聚丙烯(PP)中模拟了光束的传播。根据结果​​,使用有限元方法(FEM)对焊接过程进行了热模拟。然后通过将结果与实验试验进行比较来评估仿真模型。由于光散射对无吸收体准同时辐照策略的影响仍然未知,因此在聚丙烯(PP)中模拟了光束的传播。根据结果​​,使用有限元方法(FEM)对焊接过程进行了热模拟。然后通过将结果与实验试验进行比较来评估仿真模型。
更新日期:2020-05-13
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