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Which of these methods uses a filler wire at a high-temperature flame?

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Which of these methods uses a filler wire at a high-temperature flame?

(a) Hot dipping

(b) Metal spraying

(c) Vapor plating

(d) Cementation

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I'd like to ask this question from Protective Coatings in division Composite & Ceramic Materials of Engineering Material & Metallurgy

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The correct option is (b) Metal spraying

Explanation: In metal spraying, the surface to be coated is sprayed with the coating metal from a filler wire or powder at a high-temperature flame using a spray gun. A few materials like Al, Cu, Pb, Sn, and Zn can be coated by a spraying method.

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