Enhancing weld line visibility prediction in injection molding using physics-informed neural networks

Andrea Pieressa (), Giacomo Baruffa, Marco Sorgato and Giovanni Lucchetta
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Andrea Pieressa: University of Padova
Giacomo Baruffa: University of Padova
Marco Sorgato: University of Padova
Giovanni Lucchetta: University of Padova

Journal of Intelligent Manufacturing, 2025, vol. 36, issue 6, No 30, 4305-4318

Abstract: Abstract This study introduces a novel approach using Physics-Informed Neural Networks (PINN) to predict weld line visibility in injection-molded components based on process parameters. Leveraging PINNs, the research aims to minimize experimental tests and numerical simulations, thus reducing computational efforts, to make the classification models for surface defects more easily implementable in an industrial environment. By correlating weld line visibility with the Frozen Layer Ratio (FLR) threshold, identified through limited experimental data and simulations, the study generates synthetic datasets for pre-training neural networks. This study demonstrates that a quality classification model pre-trained with PINN-generated datasets achieves comparable performance to a randomly initialized network in terms of Recall and Area Under the Curve (AUC) metrics, with a substantial reduction of 78% in the need for experimental points. Furthermore, it achieves similar accuracy levels with 74% fewer experimental points. The results demonstrate the robustness and accuracy of neural networks pre-trained with PINNs in predicting weld line visibility, offering a promising approach to minimizing experimental efforts and computational resources.

Keywords: Physics-informed neural networks; Transfer learning; Surface defects prediction; Injection molding; Weld lines (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1007/s10845-024-02460-w

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