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The peculiarities of wear of working bodies of housings of steel and matrix drill bits and drill heads were considered and studied, and the criteria for their reparability were determined. The degree of wear of working bodies of the landing sockets for diamond carbide cutters was investigated. The methods of preparing the worn areas of the working body for their restoration by the method of arc surfacing were optimized. Special attention was paid to studying the microstructure of the interface between the base and deposited metals: steel 45 + TeroCote 7888T composite material; steel 45 + self-fl uxing steel bar Diamax M; steel 45 + tape relit LZ-11-7; VK10 hard alloy + TeroCote 7888T composite material. The structure of the TeroCote 7888T protective coating on VK10 hard alloy and steel 45 was found to provide exceptionally eff ective protection against corrosion and abrasive wear. On the basis of research, a technology was developed for repair of the working bodies of the blades of housings of steel and matrix drill bits, which allows extending their operational life. Steel and matrix drill bits and drill heads, after their restoration, passed industrial tests in Poltava, Kharkiv and Donetsk regions during drilling of gas and oil wells. It was established that the use of repaired drill bits when drilling oil and gas wells allows extending their life and saving 30...50% of the initial cost of a specifi c type of drill bit. 11 Ref., 2 Tabl., 10 Fig. [ABSTRACT FROM AUTHOR]

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