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Study of the ultraviolet emission of the electrode coatings of arc welding

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The optical emission properties of several minerals components employed in electrode coatings of arc welding have been investigated. The X-ray diffraction analysis shows that the composition of 14 commercial electrode coatings collected from different countries (Spain, France, UK, Poland, Argentina and Germany), consists of quartz, calcite, sodium and potassium rich feldspars, muscovite and rutile. The natural thermal stimulated luminescence (TSL) of these mineral phases, measured in the range of 200 - 800 nm at different temperatures (from room temperature to 400°C) displays UV-A (wavelengths of 320 nm to 400 nm) and UV-B (from 280 nm to 320 nm) emissions, with the exception of rutile. The UV-B radiation, commonly described as the most dangerous form of radiation to human life, is here associated with structural defects in the crystallographic lattice of the mineral components of electrode coatings.
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Keywords: Ultraviolet emission; electrodes; minerals coatings; spectra; thermoluminescence

Document Type: Research Article

Affiliations: 1: Museo Nacional Ciencias Naturales C/José Gutierrez Abascal 2 Madrid -28006 Spain 2: CIEMAT Av. Complutense 22, Ed 2 Madrid 28040 Spain 3: Instituto Geológico y Minero de España C/ Rios Rosas 23 Madrid 28003 Spain

Publication date: August 1, 2004

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