gouging-scraping action

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Flame cleaning — The process of flame cleaning is the cleaning of a structural steel surface by passing an intensely hot acetylene oxygen flame over it. Mill scale and rust are removed by the reducing effect of the flame and the action of the heat, leaving the… … Wikipedia
Erosion — is the carrying away or displacement of solids (sediment, soil, rock and other particles) usually by the agents of currents such as, wind, water, or ice by downward or down slope movement in response to gravity or by living organisms (in the case … Wikipedia

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