Powder-feeding device of heated spraying gun

The utility model relates to the powder-feeding device of a hot spraying gun, which is the powder-feeding device matched with the hot spraying (welding) guns to solve the problems that a present flame spraying (welding) gun only has a single barrel for feeding powder, under the condition of alternately feeding powder, the operation is inconvenient and the quality of the coat is hardly guaranteed. The powder-feeding device of the utility model is composed of two powder barrels which are fixedly connected and a three-way change-over valve; under the condition of uninterrupted spraying (welding) operation, the utility model can conveniently realize powder feeding by a single barrel, alternate powder feeding, powder feeding simultaneously by the two barrels, and the close of the powder feeding through rotating a valve core.

Technology for finishing surface defect on iron casting

The salvage process of surface defect of iron casting belongs to a welding-on process for repairing surface defect of iron casting and includes the following steps: cleaning surface defect; rapid-preheating the surface defect; jetting nickel-based alloy powder to form covering layer; rapid-heating the covering layer to make it into molten state; rapid jetting nickel-based alloy powder to fill defect to the required size; then cooling to room temp. so as to implement the welding-on process. Said invented process changes the traditional slow-heating and cooling welding-on theory and technological process, and can make the base metal tissue of the repaired metal casting basically retain its original tissue and property so as to can fully ensure its finishing and working properties.

Technology for finishing surface defect on iron casting