Abstract
The study objective is to optimize the spraying distance on supersonic arc spraying pistols, which have a number of advantages in comparison with pre-sonic spraying pistols and are widely used at present in machine-building and repair production, in repair shops of agricultural organizations and farms. 
 The problem to which the paper is devoted is to determine the spraying distance, where the maximum air flow velocity is reached in supersonic and subsonic coating modes. 
 The novelty of the work is in finding rational values of the spraying distance, at which the best physical and mechanical properties of metal-sprayed coatings are ensured.
 As a result of the study, the air flow velocity is determined at a distance from the spraying pistol nozzle and its maximum value is established. This makes it possible to adjust the coating distance from 120 mm for subsonic spraying and to 160 mm for supersonic one.
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