Prediction of the Bond Strength of Thermoplastics Welded by Laser Transmission Welding
Prediction of the Bond Strength of Thermoplastics Welded by Laser Transmission Welding
复制标题
激光透射焊接热塑性塑料结合强度的预测
DOI：
10.1007/978-3-662-60809-8_20
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Reithmayr
中科院分区：
文献类型：
--
作者：
Hopmann;Bölle;Reithmayr
激光透射焊接是用于连接热塑性塑料的各种焊接技术之一。引入焊接部件的热量低和焊接速度高是激光透射焊接成为塑料加工行业连接工艺的原因。为了最大限度地减少缺陷零件并最大限度地提高生产率，必须确定一组理想的焊接参数，以在尽可能短的循环时间内实现最大的粘合强度。为了促进这一过程，仿真模型提供了详细的分析，而无需进行破坏性且成本高昂的零件测试。为了预测通过激光透射焊接连接的两个热塑性部件的焊接强度，塑料加工研究所开发了一种模型，该模型将焊接过程中和焊接后材料的模拟热性能与塑料熔体的分子行为相结合。根据焊接过程热建模的结果，使用描述聚合物链运动的数学模型来计算最终的粘合强度，具体取决于材料特性以及加热和冷却速率。对于模拟的每次增量，从模拟中提取位于两个焊接伙伴的界面处的节点的温度数据。然后将基于聚合物熔体蠕动理论的模型与这些数据一起使用并计算粘合强度。结果通过使用模拟中使用的相同输入参数对焊接零件进行拉伸测试来验证。在第一个结果中，计算出的粘合强度与拉伸测试中测量的值非常一致。偶尔出现的偏差可以通过以下事实来解释：热模拟和蠕动理论没有考虑实验焊缝中发生的材料分解。
Laser transmission welding is one of various welding techniques used to join thermoplastics. Low heat introduction into the welded parts and a high welding speed are the reasons why laser transmission welding established itself as a joining process in the plastics processing industry. To minimise defective parts and maximise productivity, it is essential to determine a set of ideal welding parameters that allow maximum bond strength at the lowest possible cycle times. To facilitate this process, simulation models provide detailed analysis without the need for destructive and costly part testing. To predict the weld strength of two thermoplastic parts joined by laser transmission welding, the Institute for Plastics Processing has developed a model that combines the simulated thermal properties of the material during and after welding with the molecular behaviour of plastic melts. Based on the results of the thermal modelling of the welding process a mathematical model describing the movement of polymer chains is used to calculate the resulting bond strength depending on material properties as well as heating and cooling rates. The temperature data of nodes situated at the interface of both welding partners are extracted from the simulation for every time increment of the simulation. The model, which is based on the reptation theory of polymer melts, is then used with these data and the bond strength is calculated. The results are validated by tensile tests on welded parts with the same input parameters used in simulation. In first results, the calculated bond strength shows a good agreement with the values measured in tensile tests. Occasional deviations can be explained by the fact that the material decomposition occurring in experimental welds is not considered in the thermal simulation and the reptation theory.
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