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首页> 外文会议>International Congress on Applications of Lasers and Electro-Optics >NEW NOZZLE FOR HIGH POWER CO_2 LASER WELDING WITH ARGON AS SHIELDING GAS
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NEW NOZZLE FOR HIGH POWER CO_2 LASER WELDING WITH ARGON AS SHIELDING GAS

机译：用于高功率CO_2激光焊接的新喷嘴，氩气作为屏蔽气体

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It is known that Helium is the most efficient shielding gas for the high power CO_2 laser welding process. The high ionization potential of helium limits the ionization propagation from the metallic plasma plume to the shielding gas. Helium avoids the formation of parasitic plasma in the shielding gas which could absorb the incident laser beam. This phenomenon is known as Bremsstrahlung Inverse absorption. With high CO_2 laser power, it is not possible to use argon as shielding gas. The formation of this parasitic plasma depends on the laser features as the power, the power density, the focused spot diameter and the focal length. Indeed, the focal length affects the opening of the focused laser beam and the power density above the metallic plasma plume resulting from the welding process. The higher the power density above the metallic plasma plume is, the easier the parasitic plasma formation in the shielding gas will be. This paper, we present a solution to weld with a high power CO_2 laser beam and 100% Argon or other free Helium gases. The solution is suitable up to 12 kW CO_2 and a 100% Argon flow rates of 35 l/min. The results obtained with Argon shielding gas have the same quality of the traditional ones obtained with Helium.
机译：众所周知，氦是高功率CO_2激光焊接过程中最有效的屏蔽气体。氦的高电离电位限制了从金属等离子体羽流到屏蔽气体的电离传播。氦气避免在屏蔽气体中形成寄生等离子体，其可以吸收入射激光束。这种现象称为Bremsstrahlung逆吸收。具有高CO_2激光功率，不可能将氩气用作屏蔽气体。这种寄生等离子体的形成取决于激光特征作为功率，功率密度，聚焦光斑直径和焦距。实际上，焦距影响聚焦激光束的开口和由焊接过程产生的金属等离子体羽流上的功率密度。高于金属等离子体羽流的功率密度越高，屏蔽气体中的寄生等离子体形成容易。本文，我们介绍了一种用高功率CO_2激光束和100％氩气或其他自由氦气焊接的解决方案。该溶液适用于高达12kW的CO_2和35L / min的100％氩流量。用氩屏蔽气体获得的结果具有与氦获得的传统传统形式的质量相同。

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