Welder Red Seal · Question
During an oxy-fuel cutting operation on 20 mm carbon steel, the welder notices that the cut edges are severely undercut and show signs of melting and rounding at the top. The cut speed is consistent. What parameter should the welder adjust to correct this issue?
Undercutting and excessive melting on the top edge during oxy-fuel cutting, especially when travel speed is consistent, often indicate that the travel speed is
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Question: During an oxy-fuel cutting operation on 20 mm carbon steel, the welder notices that the cut edges are severely undercut and show signs of melting and rounding at the top. The cut speed is consistent. What parameter should the welder adjust to correct this issue?
Answer options:
- Increase the cutting oxygen pressure.
- Decrease the preheat flame setting. ✅ Increase the travel speed.
- Decrease the nozzle-to-work distance.
Correct answer: Increase the travel speed.
Explanation: Undercutting and excessive melting on the top edge during oxy-fuel cutting, especially when travel speed is consistent, often indicate that the travel speed is too slow. Increasing the travel speed will allow the cutting oxygen stream to move faster, preventing excessive heat build-up and melting on the top surface.
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