Gas and Liquid fuel HVOF thermal spray torches have been commercially available for the past 20 years. These torches have different fundamental operating characteristics, such as gas flows, exit gas velocities, and thermal efficiencies. This paper will examine the fundamental operating and design characteristics of the Diamond Jet, WokaJet, JP5000, and WokaStar HVOF torches. Results for total heat input to the torch, thermal efficiency, and design conditions are presented.

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