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Applied gases (welding): Which gases are commonly used in welding processes? Consider both fuel and oxidizer (or shielding) for common welding types. Choose the correct combination.

Difficulty: Easy

Oxygen and acetylene (oxy-acetylene welding)
Oxygen and chlorine
Nitrogen and ammonia
Hydrogen and chlorine

Correct Answer: Oxygen and acetylene (oxy-acetylene welding)

Explanation:

Given data

Context: Welding gases.

Concept/Approach
In oxy-acetylene welding, acetylene (C₂H₂) is the fuel and oxygen supports combustion to produce a high-temperature flame. (Other welding methods use inert shielding gases like argon/helium, but the classic pair is O₂ + acetylene.)

Final Answer
Oxygen and acetylene (oxy-acetylene welding)

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