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The purpose of the work was to determine the possibility of rebuilding of the screw coils upper surface of a screw conveyors welded previously with chromium cast iron. The variant of surfacing directly on the residues of the hard layer and with the buffer layer was considered. The technology of hardfacing the coils after removal of the hardening upper layer and the technology of welding of new elements with the use of EnDOtec DO*390 powder wire has been developed to provide a NanoAlloy structure with boron nanocarbons in the iron matrix.

Rebuilding of coils of screw conveyors with chromium cast iron hard layer