Fig. 1. Experimental equipment and principles diagram. (a) Principle diagram of laser-assisted water jet test device; (b) schematic diagram of composite cutting head device

Fig. 2. (a) Groove depth and (b) groove width varying with jet pressure at two repetition frequencies and pulse widths

Fig. 3. (a) Groove depth and (b) groove width varying with power at different jet pressures

Fig. 4. Trend of groove depth and groove width with number of repetitions at different jet pressures. (a) The changing trend of groove depth. (b) The changing trend of groove width.

Fig. 5. Groove depth varying with power at different jet pressures and scanning speeds

Fig. 6. Groove width varying with power at different jet pressures and scanning speeds

Fig. 7. Surface morphology of micro-grooves with different parameters at nozzle offset distance with repetition frequency are 0, 100 kHz, respectively. (a) Surface morphology of micro-grooves when the scanning speed is 1 mm/s, the waterjet pressure is 4 M, the laser power is 30~40 W, respectively. (b) Surface morphology of micro-grooves when the scanning speed is 2 mm/s, the waterjet pressure is 16 M, the laser power is 50~60 W, respectively. (c) Surface morphology of micro-grooves when the scanning speed is 2 mm/s, the waterjet pressure is 6~8 M, the laser power is 70 W, respectively. (d) Surface morphology of micro-grooves when the scanning speed is 1 mm/s, the waterjet pressure is 8~9 M, the laser power is 90 W, respectively

Fig. 8. Groove depth varying with jet pressure at different scanning speeds and powers

Fig. 9. Groove width varying with jet pressure at different scanning speeds and powers

Fig. 10. The surface morphology of the pround sign shaped structure. (a) Surface morphology of the pound sign shaped structure when the repetition frequency is 100 kHz, the scanning speed is 1 mm/s and the laser power is 70 W, respectively. (b) Surface morphology of the “well” when the repetition frequency is 490 kHz, the scanning speed is 1 mm/s, the waterjet pressure is 10 M and the laser power is 40 W, respectively. (c) Surface morphology of the “well” when the repetition frequency is 315 kHz, the scanning speed is 1 mm/s, the waterjet pressure is 12 M, and the laser power is 40 W, respectively

Fig. 11. Surface morphology of large-area pround sign shaped structures

Fig. 12. Comparison of SEE coefficients of 316L stainless steel before and after processing