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Thermal degradation of PC and PA6 during laser transmission welding

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Abstract

Laser transmission welding (LTW) causes a temperature rise at the weld interface which leads to melting, molecular diffusion and ultimately joining of the two components. Weld temperatures increase with laser power at a given scan speed. However, at higher temperatures, it has been observed that weld strength starts to decline due to material thermal degradation. Thermal degradation is a kinetic phenomenon which depends on both temperature and time. Thermal gravimetric analysis (TGA) is used to study the thermal degradation of two commonly used thermoplastic materials: polycarbonate (PC) and polyamide 6 (PA6). Each material was studied at several levels of carbon black (CB). The TGA data were then used to obtain the kinetic triplets (frequency factor, activation energy and reaction model) of the materials using a non-linear model-fitting method. These kinetic triplets were combined with temperature-time data obtained from a finite element method (FEM) simulation of the LTW process to predict material degradation. The conditions predicted to cause thermal degradation were then compared with experimental data. It is found that the predicted onset of material degradation is in reasonable agreement with both the onset of experimentally observed degradation and the onset of weld strength decline for PC and PA6.

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Acknowledgments

The authors would like to thank the NSERC and the NSERC Network for Innovative Plastic Materials and Manufacturing Processes for their financial support of this work, and DSM and Bayer for the materials used in this study. The authors would also like to thank Clarence McEwen of the Royal Military College of Canada (RMCC) for fabricating the test fixture, and John Perreault, also of RMCC, for injection moulding the samples.

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Authors and Affiliations

  1. Royal Military College of Canada, Kingston, ON, Canada

    P. J. Bates

  2. Queen’s University, Kingston, ON, Canada

    T. B. Okoro & M. Chen

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  1. P. J. Bates
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  2. T. B. Okoro
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  3. M. Chen
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Correspondence to P. J. Bates.

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Doc. IIW-2521, recommended for publication by Commission XVI “Polymer Joining and Adhesive Technology”.

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Bates, P.J., Okoro, T.B. & Chen, M. Thermal degradation of PC and PA6 during laser transmission welding. Weld World 59, 381–390 (2015). https://doi.org/10.1007/s40194-014-0209-9

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  • DOI: https://doi.org/10.1007/s40194-014-0209-9

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