Welder Red Seal · Question
A fabrication shop primarily cuts 3 mm mild steel using a plasma cutting system. To optimize consumable life and cut quality for this specific thickness, which type of plasma gas mixture is generally preferred?
For cutting mild steel, especially in thinner gauges, oxygen (O2) is typically the preferred plasma gas. It reacts exothermically with iron, enhancing the cutti
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Question: A fabrication shop primarily cuts 3 mm mild steel using a plasma cutting system. To optimize consumable life and cut quality for this specific thickness, which type of plasma gas mixture is generally preferred?
Answer options:
- Argon-Hydrogen (Ar-H2)
- Nitrogen (N2) ✅ Oxygen (O2)
- Argon (Ar)
Correct answer: Oxygen (O2)
Explanation: For cutting mild steel, especially in thinner gauges, oxygen (O2) is typically the preferred plasma gas. It reacts exothermically with iron, enhancing the cutting process, resulting in cleaner cuts and good speeds compared to inert gases.
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