研究目的
Investigating the development of a laser ablation process to weaken thick steel plates for the removal of hazardous substances without exceeding a critical temperature.
研究成果
The study demonstrates that reproducible ablation grooves of up to 20 mm can be produced in 25 mm thick sheets without exceeding the critical temperature of 300 °C. The achieved volume ablation rates are much higher than previously known, with an empirical model verified for the process. Future investigations will extend to underwater processes.
研究不足
The study is limited by the maximum laser power of 2 kW and the need to ensure that the critical temperature of 300 °C is not exceeded on the underside of the material. The process also requires precise control of the gas pressure to prevent selfburning.
1：Experimental Design and Method Selection:
The study focuses on laser flame and melt ablation tests to weaken 25 mm thick stainless steel sheets. The process involves an external gas supply and a one-dimensional scanner for beam oscillation.
2：Sample Selection and Data Sources:
25 mm thick stainless steel sheets (S235) are used. Data on ablation depth and temperature are collected.
3：List of Experimental Equipment and Materials:
A disk laser with a beam quality of 8 mm*mrad, nitrogen
4：0 and oxygen 5 as process gases, and a high-speed camera for depth measurement. Experimental Procedures and Operational Workflow:
The laser beam is oscillated with a defined amplitude and frequency in sinusoidal motion. The process parameters include laser power, speed, gas pressure, nozzle offset, and nozzle distance.
5：Data Analysis Methods:
The ablation depth is measured using triangulation, and temperature is recorded with a thermal camera. An empirical model is set up based on the Central Composite Design (CCD).
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