Welder Red Seal · Question
Which of the following gases is most commonly used as a preheating fuel gas for oxy-fuel cutting of mild steel?
Acetylene produces the highest flame temperature among common fuel gases when combined with oxygen, making it the most common and effective choice for preheatin
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Question: Which of the following gases is most commonly used as a preheating fuel gas for oxy-fuel cutting of mild steel?
Answer options:
- Propane
- Natural Gas ✅ Acetylene
- Hydrogen
Correct answer: Acetylene
Explanation: Acetylene produces the highest flame temperature among common fuel gases when combined with oxygen, making it the most common and effective choice for preheating steel prior to oxy-fuel cutting. While others can be used, acetylene offers the best performance for this application.
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