Fig. 1. Experiment setup

Fig. 2. Skin in vitro. (a) Physical image of slices; (b) microstructure image of skin in vitro

Fig. 3. Microstructure of skin in vitro after pretreatment

Fig. 4. Relation of welding speed and angular second moment

Fig. 5. Microstructures at different angular second moments. (a) High angular second moment; (b) low angular second moment

Fig. 6. Interaction effect of welding speed and laser power on angular second moment

Fig. 7. Relation of laser power and correlation

Fig. 8. Relation of welding speed and correlation

Fig. 9. Microstructures with different correlations. (a) Microstructure with low correlation; (b) microstructure with high correlation

Fig. 10. Relation between welding speed and entropy

Fig. 11. Microstructures with different entropies. (a) Microstructure with high entropy; (b) microstructure with low entropy

Fig. 12. Interaction effect of welding speed and laser power on entropy

Fig. 13. Relation between welding speed and contrast

Fig. 14. Microstructures with different contrasts. (a) Microstructure with low contrast; (b) microstructure with high contrast