Fig. 1. Closed-loop control system of forming of eccentric ring structure

Fig. 2. Schematic of hollow laser beam internal powder feeding

Fig. 3. Thickness-variable ring. (a) Physical model; (b) light spots at different widths

Fig. 4. Schematic of point on circle

Fig. 5. Schematic of transition

Fig. 6. (a) Triangle relationship between lifting capacity and arc length; (b) triangle relationship between speeds

Fig. 7. Principle of self-healing

Fig. 8. Forming process of thickness-variable eccentric ring

Fig. 9. Height variation curves of segments. (a) No.1; (b) No.2; (c) No.3; (d) No.4; (e) No.5

Fig. 10. Thickness-variable eccentric ring after forming. (a) Top view; (b) front view

Fig. 11. SEM images at different positions marked in Fig.10. (a) ①; (b) ②; (c) ③