Abstract
In the present paper, the mechanism of metal vapour in arc plasma is discussed through the dynamic observation of spectra of helium, chromium, manganese and iron during stationary TIG welding of stainless steel. Wavelengths from 400 nm to 700 nm are observed by a monochromator with a diffraction grating. Radiation from the arc is sent to the monochromator through optical lens and spectroscopic images are captured with 500 fps by a high-speed digital video camera. Spectra of metal elements exist locally in the arc plasma due to the dependence on plasma temperature, and also the intensive region of each metal spectrum depends on the kinds of metal elements. Most part of metal vapour produced from the weld pool surface is carried on the cathode jet and then swept away towards surroundings of the arc. However, if the driving force like diffusion in plasma is large, some metal elements can get across the cathode jet and then can be carried on the circulation flow towards the tungsten electrode.
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Tanaka, M., Tsujimura, Y. & Yamazaki, K. Dynamic Behaviour of Metal Vapour in ARC Plasma During TIG Welding. Weld World 56, 30–36 (2012). https://doi.org/10.1007/BF03321142
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DOI: https://doi.org/10.1007/BF03321142