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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

基本信息

批准号：
239632851
负责人：
Professor Dr.-Ing. Michael Schmidt
金额：
--
依托单位：
Lehrstuhl für Photonische Technologien (LPT)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/239632851?language=en
关键词：
Stress related process know how

项目摘要

On the plastic weld quality evaluation, the focus is now on the consideration of the short term strength determined in a quasi static, tensile shear test. Different operating conditions of real components, however, lead to various stresses and strains, e. g. within laser transmission weld seams. Thus, the connection responses in reality differs from that observed in laboratory conditions. In use complementary to quasi static loading dynamic, multi axis and possibly loads acting for a long time may occur. It is unknown whether welds bearing maximum short term tensile shear strength withstand also other loads optimally. Also unknown is whether determined under different load types weld factors correlate with each other and thus can be possibly suggested from one to the other. Regarding laser transmission welding, a correlation of the short and long term weld factors are jet presented. It turned out that the short and long term tensile shear strength weld seam factors are linearly related. Further it was shown, that in the welding process prevailing conditions influence the morphology and the weld seam strength considerably. A correlation apparently valid for various plastic welding processes, as has been documented similar to the extrusion and hot plate welding.A part of the project is therefore to investigate how laser transmission weld seams behave depending on different types of stress and the welding process prevailing temperature fields. Moreover it should be clarified what causes possible deviations. Are findings on the relationship between the welding process, the effected material properties and the weld seam strength for different stresses attributed to the temperature field determining the welding process, it is possible to take the laser transmission welding as a precedent for other plastic welding process and to gain transferable knowledge. Since the temperature field effected by laser transmission welding can be formed extremely flexible, the exemplary study of laser transmission welding offers very well requirements to gain transferable findings. Therefore laser transmission welding should be chosen for the proposed investigation. It is expected that temperature fields leading to optimal strength for different stresses will be different. The reasons for this have to be examined and understood fundamentally. Furthermore, by laser transmission welding resulting spatially and temporally varying temperature fields shall be affected to achieve optimal rather stress customized weld seam strengths. The approach of optimization will be the use of two beam paths with two discrete laser wavelengths, both guided by a highly dynamic beam delivery component.

在塑料焊接质量评估方面，现在的重点是考虑准静态拉伸剪切试验中确定的短期强度。然而，真实的构件在不同的工况下，会产生不同的应力和应变，例如：G.在激光透射焊缝内。因此，现实中的连接响应不同于在实验室条件下观察到的连接响应。在使用中，作为准静态载荷的补充，可能会出现动态、多轴和可能长时间作用的载荷。目前还不清楚承受最大短期拉伸剪切强度的焊缝是否也能最佳地承受其他载荷。同样未知的是，在不同载荷类型下确定的焊接系数是否彼此相关，因此可能从一个到另一个。对于激光透射焊接，提出了短期和长期焊接因素的相关性。结果表明，焊缝的短期和长期拉伸剪切强度因子之间存在线性关系。此外，它表明，在焊接过程中，占主导地位的条件影响的形态和焊缝强度相当大。一个相关性显然有效的各种塑料焊接工艺，已被证明类似的挤压和热板焊接。因此，该项目的一部分是研究激光传输焊缝的行为取决于不同类型的应力和焊接工艺占主导地位的温度场。此外，还应澄清可能出现偏差的原因。研究了由温度场决定焊接工艺的不同应力下的焊接工艺、受影响的材料性能和焊缝强度之间的关系，为激光透射焊接提供了可借鉴的经验。由于激光透射焊接的温度场具有很大的柔性，因此对激光透射焊接的实例研究为获得可传递的结果提供了很好的要求。因此，建议选择激光透射焊接进行研究。可以预期，对于不同的应力，导致最佳强度的温度场将不同。必须从根本上审视和理解其中的原因。此外，通过激光透射焊接，将影响所产生的空间和时间变化的温度场，以实现最佳的而不是应力定制的焊缝强度。优化的方法将是使用具有两个离散激光波长的两个光束路径，两者都由高度动态的光束传输组件引导。

项目成果

期刊论文数量（3）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Analysis of the interaction between the temperature field and the weld seam morphology in laser transmission welding by using two different discrete laser wavelengths

两种不同离散激光波长分析激光透射焊接温度场与焊缝形貌的相互作用

DOI：
10.2351/1.5040617
发表时间：
2018
期刊：
Journal of Laser Applications
影响因子：
2.1
作者：
B. Geißler;T. Laumer;A. Wübbeke;P. Lakemeyer;T. Frick;V. Schöppner;M. Schmidt
通讯作者：
M. Schmidt

Analysis of the Weld Seam Morphology of Polypropylene in Laser Transmission Welding

聚丙烯激光透射焊接焊缝形貌分析