Welder Red Seal · Question
When performing oxy-fuel cutting on a 12 mm mild steel plate, a welder observes that the top edge of the cut is rounded and the drag lines are excessively angled backwards. What adjustment should be made to improve the cut quality?
Rounded top edges and excessively angled drag lines typically indicate that the cutting speed is too high for the material thickness and oxygen pressure. Decrea
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Question: When performing oxy-fuel cutting on a 12 mm mild steel plate, a welder observes that the top edge of the cut is rounded and the drag lines are excessively angled backwards. What adjustment should be made to improve the cut quality?
Answer options:
- Increase the cutting speed
- Decrease the oxygen pressure
- Increase the preheat flame intensity ✅ Decrease the cutting speed
Correct answer: Decrease the cutting speed
Explanation: Rounded top edges and excessively angled drag lines typically indicate that the cutting speed is too high for the material thickness and oxygen pressure. Decreasing the cutting speed allows more time for the oxygen jet to oxidize the metal, resulting in a cleaner, squarer cut edge.
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