Steel-smelting revolving furnace smoke canal weld deposit process

The invention discloses a surfacing process method for a flue of a steelmaking converter. After the flue is subject to an integral pressure test, the rust removal is performed; before welding, a welding position of the flue is subject to water cooling; a selected nickel-base alloy welding wire contains 60 to 65 percent of Ni and 20 to 23 percent of Cr; the current and the voltage of a welding machine are adjusted; the welding current is selected to be between 110 and 200A, and the voltage is selected to between 22 and 26V; the MIG welding is adopted, and protective gas is Ar gas or mixed gas of Ar and He; and the gas flow is controlled to between 12 and 16L/min. The surfacing process method realizes the thin surfacing the surfacing layer thickness of which is between 1.78 and 2.50 mm. The surface of a surfacing layer is uniform and smooth, and has no phenomena of cracks, slag inclusion, air holes, and missing welding. After the successful surfacing is performed on the flue of the steelmaking converter, the se