Development and characterization of a resistance spot welding aerosol generator and inhalation exposure system

Autor:	Terence Meighan, Walter McKinney, Jared L. Cumpston, Aliakbar Afshari, James M. Antonini, Sherri Friend, Bean T. Chen, Patti C. Zeidler-Erdely, Mark Jackson, Amy Cumpston, Diane Schwegler-Berry, David G. Frazer, H. Donny Leonard
Rok vydání:	2014
Předmět:	Atmosphere Exposure Chambers Materials science Health Toxicology and Mutagenesis Air Pollutants Occupational Welding Toxicology complex mixtures Fires law.invention law Adhesives Animals Laboratory Toxicity Tests Animals Particle Size Spot welding Aerosols Automation Laboratory Inhalation exposure Inhalation Exposure Volatile Organic Compounds Metallurgy technology industry and agriculture respiratory system Particulates United States Aerosol Metals Steel visual_art Electrode Microscopy Electron Scanning visual_art.visual_art_medium Particulate Matter Particle size Sheet metal National Institute for Occupational Safety and Health U.S
Zdroj:	Inhalation Toxicology. 26:708-719
ISSN:	1091-7691 0895-8378
DOI:	10.3109/08958378.2014.941118
Popis:	Limited information exists regarding the health risks associated with inhaling aerosols that are generated during resistance spot welding of metals treated with adhesives. Toxicology studies evaluating spot welding aerosols are non-existent. A resistance spot welding aerosol generator and inhalation exposure system was developed. The system was designed by directing strips of sheet metal that were treated with an adhesive to two electrodes of a spot welder. Spot welds were made at a specified distance from each other by a computer-controlled welding gun in a fume collection chamber. Different target aerosol concentrations were maintained within the exposure chamber during a 4-h exposure period. In addition, the exposure system was run in two modes, spark and no spark, which resulted in different chemical profiles and particle size distributions. Complex aerosols were produced that contained both metal particulates and volatile organic compounds (VOCs). Size distribution of the particles was multi-modal. The majority of particles were chain-like agglomerates of ultrafine primary particles. The submicron mode of agglomerated particles accounted for the largest portion of particles in terms of particle number. Metal expulsion during spot welding caused the formation of larger, more spherical particles (spatter). These spatter particles appeared in the micron size mode and accounted for the greatest amount of particles in terms of mass. With this system, it is possible to examine potential mechanisms by which spot welding aerosols can affect health, as well as assess which component of the aerosol may be responsible for adverse health outcomes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::62bc9e74c8af41646da58f0e6c363fe4 https://doi.org/10.3109/08958378.2014.941118 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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