Abstract
In the industrial field, in order to protect the metal, the metal surface is painted. However, when metals need to be welded, coating becomes a problem. Since the solid polymer coating sublimates during the high temperature welding process, pores are generated in the weld bead[1] .So removal coating is very importance in industry and there have numerous ways to removal coating. Paint removal by laser ablation is favoured among cleaning techniques due to its high efficiency. How to predict the optimal laser parameters without producing damage to substrate still remains challenging for accurate paint removal [2] .In this paper, based on the laser ablation morphology, combined with experiments and numerical simulations, the mechanism and optimal conditions of laser ablation for paint removal are deeply studied. Our studies suggest that laser removal have many physics and chemistry phenomenon including the redox reaction, carbonization, melting and gasification. The threshold value of laser paint removal is 30W obtained from the laser cleaning experiment. The model of laser temperature rise is established, and it is found by numerical simulation that the theory is in good agreement with the experiment
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