In this paper, a type of high efficient ultra-thick high-chromium cast iron surfacing flux-cored wire of a diameter of 6mm is designed to solve the technological problem that the processing property of ultra-thick flux-cored wire can not meet the welding requirement, and “inter twist connection” and “inner wire” technologies were adopted. The effect of alloying elements Cr and C in the powder on the microstructure and property of deposited metal was researched. The results showed that when Cr content is 39% and C content is 5.7% in the powder, the microstructure of deposited metal is nearly eutectic, of which the hardness and wear resistance are higher. The test of engineering application of surfacing was carried out on bucket in wheel loader. It is proved that the wear-resisting property and the service life of the bucket can be significantly improved.
