Q1: Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal.

ANS:B - intensive oxidation

Intensive oxidation refers to a rapid and vigorous chemical reaction between a substance and oxygen, resulting in the formation of oxides. In the context of metal cutting with an oxy-acetylene flame, intensive oxidation occurs when the high-temperature flame comes into contact with the metal surface. During the cutting process, the oxy-acetylene flame generates extremely high temperatures, typically exceeding 3,000 degrees Celsius (5,400 degrees Fahrenheit). At such elevated temperatures, the metal undergoes rapid oxidation when exposed to the oxygen-rich flame. This oxidation reaction involves the transfer of oxygen atoms from the surrounding atmosphere to the metal surface, where they combine with the metal atoms to form metal oxides. The rapid and intense nature of this oxidation reaction is what facilitates the efficient cutting of metals. As the metal oxidizes, it weakens and eventually melts, allowing the high-pressure oxygen stream to blow away the molten metal oxides. This continuous process of oxidation and removal of the molten material creates a clean and precise cut along the desired path. In summary, intensive oxidation in metal cutting with an oxy-acetylene flame refers to the rapid and thorough oxidation of the metal surface by the high-temperature flame, leading to the formation of metal oxides and enabling the cutting process to occur effectively.