Control of exposure to hexavalent chromium concentration in shielded metal arc welding fumes by nano-coating of electrodes. (3rd April 2017)

• Record Type: Journal Article
• Authors: Sivapirakasam, S. P.; Mohan, Sreejith; Santhosh Kumar, M. C.; Thomas Paul, Ashley; Surianarayanan, M.
• Is Part Of: International journal of occupational and environmental health. Volume 23:Number 2(2017)
• Page Start: 128
• Page End: 142
• Publication Date: 2017-04-03
• Subjects: Coated electrodes -- Taguchi methodology -- Cr(VI) FR -- constituent analysis; Industrial hygiene -- Periodicals; Industrial toxicology -- Periodicals; Environmental health -- Periodicals; Consumer goods -- Health aspects -- Periodicals; 613
• DOI: 10.1080/10773525.2018.1436014
• Languages: English
• ISSNs: 1077-3525

Abstract

Abstract: Background : Cr(VI) is a suspected human carcinogen formed as a by-product of stainless steel welding. Nano-alumina and nano-titania coating of electrodes reduced the welding fume levels. Objective : To investigate the effect of nano-coating of welding electrodes on Cr(VI) formation rate (Cr(VI) FR) from a shielded metal arc welding process. Methods : The core welding wires were coated with nano-alumina and nano-titania using the sol-gel dip coating technique. Bead-on plate welds were deposited on SS 316 LN plates kept inside a fume test chamber. Cr(VI) analysis was done using an atomic absorption spectrometer (AAS). Results : A reduction of 40% and 76%, respectively, in the Cr(VI) FR was observed from nano-alumina and nano-titania coated electrodes. Increase in the fume level decreased the Cr(VI) FR. Discussion : Increase in fume levels blocked the UV radiation responsible for the formation of ozone thereby preventing the formation of Cr(VI).