In the traditional laser cutting of carbon steel, oxygen is generally selected. With the continuous progress and breakthrough of high-power laser cutting technology, nitrogen and air have also become powerful aids for carbon steel processing. The flexible selection of nitrogen, oxygen and air according to different application needs can not only improve the cutting efficiency, but also reduce the terminal processing cost.
Reasons for selecting different gases:
1. For carbon steel of any thickness, there is a limit speed when using oxygen to cut. Even if the laser power increases, the cutting speed remains unchanged;
2. High power laser uses oxygen to cut medium and thin carbon steel, so as to prevent cutting overburn caused by high power. Power cutting must be reduced;
3. Ten thousand watt laser cutting medium and thin carbon steel with oxygen has no speed advantage, but increases the processing cost.
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Machining efficiency of carbon steel cutting with different gases
It can be seen from the above test data:
1. Carbon steel 6 － 20mm thick plate, 12KW cutting machine uses air to improve the cutting efficiency by 532% － 14% compared with oxygen;
2. For carbon steel 6 － 20mm thick plate, the cutting efficiency of 12KW cutting machine with air is 27% － 11% higher than that with nitrogen.
Processing cost of carbon steel cutting with different gases
It can be seen from the above test data:
1. The thickness of carbon steel is 6-16mm, and the processing cost of 12KW cutting machine (air ＜ nitrogen ＜ oxygen);
2. The thickness of carbon steel is 18-20mm, and the processing cost of 12KW cutting machine (air ＜ oxygen ＜ nitrogen).
Annual processing cost of carbon steel cutting with different gases
The processing cost is calculated according to the following principles:
Processing and production time: 8 hours/day, 300 days/year
It can be seen from the above test data:
1.12KW cutting machine uses air to cut carbon steel, which can save up to 1.1 million yuan in processing cost per year;
2. The thickness of carbon steel is 6-16mm. The thinner the plate is, the cheaper the processing cost is.
Effect of cutting carbon steel samples with different gases
Based on the above test data, we can see that:
1. The 10000 watt laser cutting machine can process the carbon steel 6-16mm, and the use of air to oxygen cutting can save the processing cost up to 1.1 million yuan a year;
2. 10000 watt laser cutting machine is used to process carbon steel 6-16mm, and the cutting efficiency of air is 532% – 100% higher than that of oxygen;
3. Ten thousand watt laser cutting machine is used to process carbon steel 6-16mm, and the cost of air cutting is 85% – 51% lower than that of oxygen cutting;
4. Ten thousand watt laser cutting machine is used to process 22-45mm carbon steel. Nitrogen and air cutting are used. Slag hanging is serious, and the processing cost is not superior. Oxygen cutting is recommended to ensure the cutting effect.
