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KMID : 0895420000100010032
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Journal of Korean Society of Occupational and Enviromental Hygiene
2000 Volume.10 No. 1 p.32 ~ p.44
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Content Variation of Total Chromium and Hexavalent Chromium in Flux Cored Arc Welding
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Kim Shin-Bum
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Abstract
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The practice of welding stainless steel is known to produce various valance states of chromium. CO₂ flux cored arc welding on stainless was performed in fume collection chamber. Content of total chromium and hexavalent chromium in fumes, content of hexavalent chromium in total chromium, solubility of hexavalent chromium were investigated.
Content of total chromium in fumes increases from 2～3% to 7～9% as a function of input energy, but hexavalent chromium, less than 1.2% in fumes, is not related to input energy. Hexavalent chromium in fumes exists as solubles up to 90%.
Content of total chromium in flux cored arc welding fumes and solubility of hexavalent chromium are similar to shielded metal arc welding fumes, but content of hexavalent chromium is similar to metal inert gas welding fumes. These characteristics are relevant to flux of wires and CO₂ shielding gas.
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