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

Analysis of the Weld Seam Morphology of Polypropylene in Laser Transmission Welding
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聚丙烯激光透射焊接焊缝形貌分析

DOI:
10.1115/1.4040876
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发表时间:
2018
期刊:
Journal of Manufacturing Science and Engineering
影响因子:
--
通讯作者:
M. Schmidt
M. Schmidt
中科院分区:
--
文献类型:
--
作者:
B. Geißler;T. Laumer;A. Wübbeke;T. Frick;V. Schöppner;M. Schmidt

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Laser transmission welding is a well-known joining technology for welding thermoplastics. Although the process is already used industrially, fundamental process-structure-property relationships are not fully understood and are therefore the subject of current research. One aspect of these mentioned process-structure-property relationships is the interaction between the temperature field during the welding process, the weld seam morphology of semi-crystalline thermoplastics, and the weld seam strength. In this study, the influence of the line energy on the weld seam morphology of polypropylenes is analyzed. For this purpose, the size of spherulites in the weld seam is investigated, as well as different occurring phases of polypropylene (α- and β-phase). It is shown that both the spherulite size of the α-phase and the amount of β-phase increase with increasing line energy. For the explanation and discussion of the results, a temperature-dependent thermal simulation model is used to derive characteristic attributes of the temperature field (maximum temperatures, cooling rates, temperature gradients).
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