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Spectrums of plasma in laser welding aluminum alloy were measured through a transient spectrometer. Used Boltzmann diagrams, calculate the temperature of plasma, which were deduced from Mg I spectrum lines between 200 and 600 nm.
The effect of key factors such as beam quality, focal length, distance of beam propagating on the quality of laser beam focusing and how to optimize the focus system are discussed in this paper.
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