Fig. 1. Schematic of laser additive manufacturing process and defects. (a) Interaction process between laser and raw material^[26]; (b) lack of fusion^[35]; (c) keyhole^[36]; (d) crack^[37]; (e) inconsistent melt pool^[38]; (f) balling^[38]

Fig. 2. Illustrations of wing rudders. (a) Overall morphology of lattice wing rudder; (b) lattice structure of lattice wing rudder;(c) overall morphology of honeycomb wing rudder; (d) honeycomb structure of honeycomb wing rudder

Fig. 3. Illustrations of brackets. (a) Momentum wheel bracket^[41]; (b) antenna support of Sentinel-1 satellite^[42]

Fig. 4. Illustrations of cabins. (a) Barrel cabin; (b) irregular cabin

Fig. 5. LAM engine

Fig. 6. Illustrations of heat-proof outsole frame of re-entry capsule^[47]. (a) Schematic of heat-proof outsole frame of re-entry capsule; (b) heat-proof outsole frame of re-entry capsule

Fig. 7. Working diagram of selective laser melting equipment^[51-52]

Fig. 8. Diagram offield mirror format^[54]

Fig. 9. Extension of format by moving galvanometer^[56]

Fig. 10. Illustrations of multibeam splicing. (a) Schematic of extension of format by multibeams^[57]; (b) schematic ^[54]

Fig. 11. Laser melting deposition equipment^[59-60]

Fig. 12. Laser melting deposition equipment with manipulator^[61]

Fig. 13. Principle diagram of laser five-axis additive manufacturing and subtractive manufacturing process^[21]

Fig. 14. Layout of additive manufacturing demonstration production line

Fig. 15. Demonstration of additive manufacturing production line