Behavior of Manganese in Welding Fume (I)(Materials, Metallurgy & Weldability)

概要

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The fumes produced from various welding materials have been investigated by means of chemical analysis, X-ray diffraction, EXAFS and optical absorption measurements. The results obtained are summarized as follows: (1) From chemical analysis of fumes, it is indicated that in the case of arc welding with covered electrode, MnO content in the fumes increases with increasing Mn metal in welding rod. The MnO content in the fumes produced from high manganese welding rods was also approached to about 40wt.%. On the other hand, in the case of gas shield welding, MnO content in the fumes increases with increasing CO_2 shield gas or by the addition of O_2 gas. (2) X-ray diffraction analysis showed that manganese phases in the fumes produced from arc welding with covered electrode were MnFe_2O_4 and KnMO_2, but that in the case of gas shield welding, any crystalline phase with Mn element did not appear. (3) EXAFS and optical absorption measurements suggest that the valence of Mn ions in the fumes studied is Mn^<2+> and/or Mn^<3+>
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