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Which gas jet assisted process is suitable for most of the metals?

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Which gas jet assisted process is suitable for most of the metals?

(a) Oxygen gas

(b) Nitrogen gas

(c) Helium gas

(d) All of the mentioned

I got this question in semester exam.

This interesting question is from LBM-Applications topic in division Thermal Processes of Advanced Machining

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Correct answer is (a) Oxygen gas

To explain: Oxygen-jet assistance is used for most metals, as the gas liberates additional energy by the exothermal chemical reactions.

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