Abstract
High demands for precision laser soldering technologies arise as digital devices move towards volume downsizing. Laser soldering is a very complicated thermodynamic chemical process, and controlling the temperature also becomes challenging. Based on experimental data, a thermodynamic model for the soldering process is developed in this study, taking into account variables like laser power, spot size, and heating duration, among others. A novel feedforward-PI control algorithm is proposed using the model which includes a target temperature curve-based feedforward algorithm to help the PI feedback control to achieve precise temperature control during the laser soldering process. Experiments and comparisons are used to demonstrate the efficacy of the suggested model and control approach. The outcomes show that the suggested model is capable of effectively describing the dynamics of laser soldering. The temperature standard deviation of the proposed control technique is shown to be lower than 55%-60% of the classic PID control approach, while the former has higher precision.
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All data generated or analyzed during this study are included in the present article.
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Funding
This work was supported by the National Natural Science Foundation of China (62272112), Natural Science Foundation of Guangdong Province (2023A1515011998) Science and Technology Projects in Guangzhou (202201020120).
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Zhihua Chen performed the model derivation and designed control method. Jiasen Chen performed the experiments and the data analysis and wrote the original draft. Peiqing Hong assisted in the experiment. Tao Zhang contributed to the supervision, reviewing, and editing of this paper. Yunan Bao provided laser welding equipment and software.
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Chen, Z., Chen, J., Hong, P. et al. Data-based thermodynamic model and feedforward-PI control method for laser soldering. Int J Adv Manuf Technol 129, 5249–5260 (2023). https://doi.org/10.1007/s00170-023-12553-0
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DOI: https://doi.org/10.1007/s00170-023-12553-0