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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Spectroscopic diagnostics of plasma during laser processing of aluminium
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Spectroscopic diagnostics of plasma during laser processing of aluminium

机译：铝激光加工过程中等离子体的光谱诊断

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The role of the plasma in laser-metal interaction is of considerable interest due to its influence in the energy transfer mechanism in industrial laser materials processing. A 10 kW CO2 laser was used to study its interaction with aluminium under an argon environment. The objective was to determine the absorption and refraction of the laser beam through the plasma during the processing of aluminium. Laser processing of aluminium is becoming an important topic for many industries, including the automobile industry. The spectroscopic relative line to continuum method was used to determine the electron temperature distribution within the plasma by investigating the 4158 angstrom Ar I line emission and the continuum adjacent to it. The plasmas are induced in 1.0 atm pure Ar environment over a translating A1 target, using f/7 and 10kW CO2 laser. Spectroscopic data indicated that the plasma composition and behaviour were Ar-dominated. Experimental results indicated the plasma core temperature to be 14 000-15 300K over the incident range of laser powers investigated from 5 to 7 kW. It was found that 7.5-29% of the incident laser power was absorbed by the plasma. Cross-section analysis of the melt pools from the A1 samples revealed the absence of any key-hole formation and confirmed that the energy transfer mechanism in the targets was conduction dominated for the reported range of experimental data.
机译：由于等离子体对工业激光材料加工中的能量转移机制有影响，因此等离子体在激光与金属的相互作用中的作用备受关注。使用10 kW的CO2激光器研究其在氩气环境下与铝的相互作用。目的是确定铝加工过程中穿过等离子体的激光束的吸收和折射。铝的激光加工已成为许多行业的重要主题，包括汽车行业。通过研究4158埃Ar I线的发射和与之相邻的连续体，使用光谱相对于连续体的相对线方法确定等离子体内的电子温度分布。使用f / 7和10kW的CO2激光，在1.0atm的纯Ar环境中，在平移的A1靶上感应等离子体。光谱数据表明，等离子体的组成和行为均以氩为主。实验结果表明，在从5到7 kW的激光功率入射范围内，等离子体核心温度为14 000-15 300K。发现等离子体的吸收了7.5-29％的入射激光功率。对来自A1样品的熔池的横截面分析表明，没有任何键孔形成，并证实了在报告的实验数据范围内，靶材中的能量转移机制是传导主导的。

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