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OPTICAL CORRECTION FOR HEAT BUILDUP IN THE CENTER OF TTIr PLASTICS WELDS

机译:TTIR塑料焊缝中心的热堆积的光学校正

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Through Transmission Infrared (TTIr) laser welding of plastics often results in voids forming in the center of the weld. These voids can lead to weak and unattractive welds. Their formation is due to non-uniform temperature distributions within the weld zone and out gassing of volatiles (such as moisture). This non-uniform temperature distribution has been demonstrated not only by a Gaussian laser light distribution but also by an even light distribution depending on the joint/part design. This paper reviews the development of tailored optics that re-shape the distribution of typical light/laser sources in order to promote uniform temperature distributions. It was seen in FEA models that by using uniform heat distributions, uniform temperature fields were produced in butt joint configurations. In addition it was seen that a distribution with high heat input on the outer edges produced uniform heating in lap shear joint configurations. Laboratory experiments verified these FEA predictions, and strong and attractive welds were generated.
机译:通过透射红外(TTIR)激光焊接塑料常规导致在焊缝中心形成空隙。这些空隙可导致弱和造成弱焊缝。它们的形成是由于焊接区域内的不均匀温度分布以及挥发物(例如水分)。该不仅通过高斯激光分布证明了这种不均匀的温度分布,而且还通过均匀的光分布来证明,这取决于关节/部件设计。本文评论了定制光学元件的开发,可重新塑造典型光/激光源的分布,以促进均匀的温度分布。在FEA模型中可以看出,通过使用均匀的热量分布,在对接联合配置中产生均匀的温度场。此外,可以看出,外边缘上具有高热量输入的分布在膝盖剪切接头构造中产生均匀的加热。实验室实验验证了这些FEA预测,产生了强大和有吸引力的焊缝。

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