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6451 |
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Thursday, June 11, 2020, Hall G1 1:40 PM Process Diagnostics, Sensors & Controls |
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Experimental study of TWA torch with optimized air cap |
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Larry Pershin* / University of Toronto, Canada S. Zhang / School of mechanical Engineering, P.R. China C. Nan/ School of mechanical Engineering, P.R. China F. Liu/ School of mechanical Engineering, P.R. China J. Mostaghimi/ University of Toronto, Canada |
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Twin Wire Arc spraying is a robust cost effective process for coatings deposition in various industries. We study an industrial wire arc torch (HD 456, Thermion, US) with optimized air cap geometry, which is based on our previous numerical modelling. To compare a standard and the new air cap design we used a High Speed Camera and DPV2000 sensor for particles conditions monitoring. Low density aluminum wire and high density 316 stainless steel wire were used in tests. The sprayed particles were collected in a water bath for size analysis and the deposited coatings microstructure, deposition efficiency were also compared. The results show that the torch with optimizes air cap produces better focused particles plume. For 316 stainless steel wire, the spray plume angles were 9.3o for the standard air cap and it reduces to 8.4o with the new air cap. This also affects the particle velocity at a typical spray distance 225, which increased from105 m/s to 125 m/s by using the new air cap. Deposition efficiency was estimated by coating thickness after 10 torch passes; it was 388 µm with the optimized torch while the standard air cap deposit was only 289 ¼m. |