title: [Calculating the stark broadening of welding arc spectra by Fourier transform method].
abstract: It's the most effective and accurate method to calculate the electronic density of plasma by using the Stark width of the plasma spectrum. However, it's difficult to separate Stark width from the composite spectrum linear produced by several mechanisms. In the present paper, Fourier transform was used to separate the Lorentz linear from the spectrum observed, thus to get the accurate Stark width. And we calculated the distribution of the TIG welding arc plasma. This method does not need to measure arc temperature accurately, to measure the width of the plasma spectrum broadened by instrument, and has the function to reject the noise data. The results show that, on the axis, the electron density of TIG welding arc decreases with the distance from tungsten increasing, and changes from 1.21 X 10(17) cm(-3) to 1.58 x 10(17) cm(-3); in the radial, the electron density decreases with the distance from axis increasing, and near the tungsten zone the biggest electronic density is off axis.
authors.affiliation: Welding Engineering Technology Research Institute of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China. panchenggang_hit@126.com
authors.forename: Cheng-Gang
authors.initials: CG
authors.lastname: Pan
authors.forename: Xue-Ming
authors.initials: XM
authors.lastname: Hua
authors.forename: Wang
authors.initials: W
authors.lastname: Zhang
authors.forename: Fang
authors.initials: F
authors.lastname: Li
authors.forename: Xiao
authors.initials: X
authors.lastname: Xiao