Fig. 1. SEM morphology of Ni60A powder

Fig. 2. Schematic of the follow-up feed pulse current strengthened laser cladding processing

Fig. 3. Cross-section morphology of cladding layers. (a) Conventional laser cladding; (b) follow-up feed pulse current strengthened laser cladding

Fig. 4. Schematic of cross-section of single laser cladding

Fig. 5. Morphology of cladding layers. (a) Conventional laser cladding; (b) follow-up feed pulse current strengthened laser cladding

Fig. 6. Macroscopic crack of cladding samples. (a) Conventional laser cladding; (b) follow-up feed pulse current strengthened laser cladding

Fig. 7. Schematics of crack self-healing of cladding layer. (a) Follow effect at the crack tip; (b) closed and healing of crack tip; (c) new follow effect at new crack tip; (d) closed and healing of new crack tip; (e) self-healing whole crack after multi crack healing