Analysis of the interactions between the morphology and the properties of weld seams during laser transmission welding of plastics by a three-dimensional, spatially re-solved determination of the crystallinity of the weld seam by means of Raman microscopy

通过拉曼显微镜对焊缝结晶度进行三维空间分辨率测定,分析塑料激光透射焊接过程中焊缝形态和性能之间的相互作用

基本信息

项目摘要

In this project, the cause-and-effect relationships between the temperature field present in the weld seam, the weld seam morphology and the mechanical properties of laser-welded plastic components are to be determined. For this purpose, a new spatially resolved measuring method based on Raman spectroscopy for the determination of the local degree of crystallization in semicrystalline materials is to be scientifically developed and qualified, and the influence of the degree of crystallization in the weld seam on the short-term and long-term properties of laser-welded components is investigated. The measurement method to be developed is suitable, on the one hand, for the predictive material analysis in order to determine material properties for the subsequent joining process. Local different degrees of crystallization can be identified in the component and compensated by a suitable process parameter adjustment during laser beam welding. On the other hand, process-structure-property relationships in laser transmission welding are to be analyzed, understood and optimized.Based on preliminary work, the Raman microscopy is to be further developed and validated for the determination of locally spatially resolved crystallization degrees. Various semi-crystalline materials (PA6, PP and PE-HD) are to be used for this purpose. Here, the development of an approach for the depth-resolved determination of polymer properties is an important step. Subsequently, the degree of crystallization in the weld seam of laser welded test specimens is to be analyzed as a function of different process parameters. Furthermore, relationships between the degree of crystallization and the short-term and long-term properties of the weld connection are investigated. A thermal FEM model of the laser transmission welding process is intended to represent the temperature field during the welding process and thus to determine the cause-and-effect relationships between the parameters of the temperature field (maximum temperature, heating and cooling rate) and degree of crystallization. The degree of crystallization in the weld seam is to be adjusted by adapted irradiation strategies (controlled cooling by multiple crossings, generation of quasi-stationary temperature fields by oscillating movement of the laser beam).
在该项目中,将确定焊缝中存在的温度场、焊缝形态和激光焊接塑料部件的机械性能之间的因果关系。为此,需要科学地开发和验证一种新的基于拉曼光谱的空间分辨测量方法,用于确定半结晶材料中的局部结晶度,并研究焊缝中的结晶度对激光焊接部件的短期和长期性能的影响。一方面,所开发的测量方法适用于预测性材料分析,以便确定后续连接过程的材料特性。在激光束焊接过程中,可以识别部件中的局部不同结晶程度,并通过适当的工艺参数调整进行补偿。另一方面,激光透射焊接过程中的工艺-结构-性能关系有待分析、理解和优化,在前期工作的基础上,拉曼显微镜技术有待进一步发展和验证,以确定局部空间分辨的结晶度。各种半结晶材料(PA 6、PP和PE-HD)可用于此目的。在这里,开发一种用于聚合物性质的深度分辨测定的方法是重要的一步。随后,激光焊接试样焊缝中的结晶度将作为不同工艺参数的函数进行分析。此外,结晶度和焊接连接的短期和长期性能之间的关系进行了研究。激光透射焊接过程的热有限元模型旨在表示焊接过程中的温度场,从而确定温度场参数(最高温度、加热和冷却速率)与结晶度之间的因果关系。焊缝中的结晶度将通过适当的辐照策略(通过多个交叉点控制冷却、通过激光束的振荡运动产生准稳态温度场)进行调整。

项目成果

期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Correlation between weld seam morphology and mechanical properties in laser transmission welding of polypropylene
聚丙烯激光透射焊接焊缝形貌与力学性能的相关性
  • DOI:
    10.1016/j.procir.2020.09.119
  • 发表时间:
    2020
  • 期刊:
  • 影响因子:
    0
  • 作者:
    M.-L. Röhricht;T. Stichel;S. Roth;P. Bräuer;M. Schmidt;S. Will
  • 通讯作者:
    S. Will
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Professor Dr.-Ing. Michael Schmidt其他文献

Professor Dr.-Ing. Michael Schmidt的其他文献

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{{ truncateString('Professor Dr.-Ing. Michael Schmidt', 18)}}的其他基金

Melt dynamics in remote laser material processing
远程激光材料加工中的熔体动力学
  • 批准号:
    407703212
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Spatially resolved detection of the scattering coefficient and the capillary network of tissue by using a random laser
使用随机激光对组织的散射系数和毛细血管网络进行空间分辨检测
  • 批准号:
    414732368
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
3D diffractive elements through fs-laser direct writing
飞秒激光直写3D衍射元件
  • 批准号:
    409765270
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Three dimensional mapping of turbid media by hyper spectral imaging
通过高光谱成像对浑浊介质进行三维绘图
  • 批准号:
    337270237
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Beam shaping of ultrashort laser pulses by means of acousto-optic deflection and refraction
通过声光偏转和折射对超短激光脉冲进行光束整形
  • 批准号:
    278658739
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Transient Multi-Phase Modelling of Process Dynamics in Ultrafast Laser Ablation of Metals
金属超快激光烧蚀过程动力学的瞬态多相建模
  • 批准号:
    245510492
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Multi-Physics Modeling of Laser Beam Drilling with Temporally Shaped Pulses
使用时间整形脉冲进行激光束钻孔的多物理场建模
  • 批准号:
    278627194
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Arc-based ultra-short laser pulse assisted workpiece machining
基于电弧的超短激光脉冲辅助工件加工
  • 批准号:
    263891905
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Stress-related process know-how and process optimasiton of plastic welding unsing the example of laser transmission welding
以激光透射焊接为例,了解塑料焊接的应力相关工艺知识和工艺优化
  • 批准号:
    239632851
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Einbettende Stereolithogrphie - Prozessentwicklung zur Integration von Funktionselementen in mechatronischen Baugruppen
嵌入立体光刻 - 机电一体化组件中功能元件集成的工艺开发
  • 批准号:
    190972254
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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多维数据辨析法用于兽药与生物大分子作用体系的研究
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