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首页> 外文会议>Laser-based micro- and nanoprocessing X >Online Process-Monitoring at Quasi-Simultaneous Laser Transmission Welding using a 3D-Scanner with integrated Pyrometer
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Online Process-Monitoring at Quasi-Simultaneous Laser Transmission Welding using a 3D-Scanner with integrated Pyrometer

机译：使用集成的高温计的3D扫描仪在线进行准同时激光传输焊接过程中的在线过程监控

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Quasi-simultaneous laser transmission welding is a well-known joining technique for thermoplastics and mainly used in the automotive as well as in the medical industry. For process control usually the so called set-path monitoring is used, where the weld is specified as "good" if the irradiation time is inside a defined confidence interval. However, the detection of small-sized gaps or thermal damaged zones is not possible with this technique. The analyzation of the weld seam temperature during welding offers the possibility to overcome this problem. In this approach a 3D-scanner is used instead of a scanner with flat-field optic. By using a pyrometer in combination with a 3D-scanner no color-corrected optic is needed in order to provide that laser- and detection-spot are concentric. Experimental studies on polyethylene T-joints have shown that the quality of the signal is adequate, despite the use of an optical setup with a long working distance and a small optical aperture. The effects on temperature are studied for defects like a gap in the joining zone. Therefore a notch was milled into the absorbent polymer. In case of producing housings for electronic parts the effect of an electrical wire between the joining partners is also investigated. Both defects can be identified by a local temperature deviation even at a feed rate of four meters per second. Furthermore a strategy for signal-processing is demonstrated. By this, remaining defects can be identified. Consequently an online detection of local defects is possible, which makes a dynamic process control feasible.
机译：准同时激光透射焊接是一种众所周知的热塑性塑料连接技术，主要用于汽车以及医疗行业。对于过程控制，通常使用所谓的设定路径监视，如果照射时间在定义的置信区间内，则将焊缝指定为“良好”。但是，使用这种技术无法检测到小间隙或热损坏区域。焊接过程中焊缝温度的分析为克服这一问题提供了可能。在这种方法中，使用3D扫描仪代替具有平场光学元件的扫描仪。通过将高温计与3D扫描仪结合使用，不需要进行色彩校正的光学元件即可确保激光和检测点是同心的。对聚乙烯T形接头的实验研究表明，尽管使用了工作距离长且光学孔径小的光学装置，但信号质量还是足够的。研究了温度对连接区域中间隙等缺陷的影响。因此，将切口切入吸收性聚合物中。在生产用于电子部件的壳体的情况下，还研究了接合伙伴之间的电线的影响。即使以每秒四米的进给速度，也可以通过局部温度偏差来识别这两种缺陷。此外，还演示了一种信号处理策略。由此，可以识别剩余的缺陷。因此，可以在线检测局部缺陷，这使得动态过程控制变得可行。

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