Analysis of the Weld Seam Morphology of Polypropylene in Laser Transmission Welding
| Autor: | Bastian Geißler, Andrea Wübbeke, Michael Schmidt, Tobias Laumer, Thomas Frick, Volker Schöppner |
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| Rok vydání: | 2018 |
| Předmět: |
Polypropylene
Morphology (linguistics) Materials science 010308 nuclear & particles physics Mechanical Engineering 02 engineering and technology Welding 021001 nanoscience & nanotechnology Laser 01 natural sciences Industrial and Manufacturing Engineering Computer Science Applications law.invention Weld seam chemistry.chemical_compound Temperature gradient Differential scanning calorimetry chemistry Control and Systems Engineering law 0103 physical sciences Composite material 0210 nano-technology Laser transmission welding |
| Zdroj: | Journal of Manufacturing Science and Engineering. 140 |
| ISSN: | 1528-8935 1087-1357 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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