Influence of Powder Feed Rate on the Outflow Field in Laser Cladding on a Four-channel Coaxial Powder Feeding Nozzle. - GUO, S. R.; YIN, Q. Q.; CUI, L. J.; CUI, Y. H.; LI, X. L.; ZHENG, B.; CAO, Y. L.; ZENG, W. H. (Lasers in Engineering (Old City Publishing), 2020)