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The influence of operating parameters on number-weighted aerosol size distribution generated from a gas metal arc welding process.

Authors
Zimmer-A; Baron-P; Biswas-P
Source
J Aerosol Sci 2002 Mar; 33(3):519-531
NIOSHTIC No.
20022427
Abstract
In light of recent research on the potential health problems associated with sub-micrometer aerosols, a study was conducted to determine the effect that droplet mass transfer mode, shield gas composition, and welding spatter had upon the aerosols generated from a Gas Metal Arc Welding (GMAW) Operation. The results revealed that the sub-micrometer aerosols produced during spray transfer resulted in markedly higher concentrations of nucleated particles than those produced during globular transfer. This probably resulted from a larger droplet surface area for vaporization of metallic species. The shield gas experiments results revealed that as the percentage of carbon dioxide increased the number of nucleated particles also increased. It appears that oxygen may have facilitated chemical reactions with the alloy constituents, thereby increasing the mass transfer rate from the evaporating metal droplets in the plasma. Finally, an attempt to characterize the spatter aerosol revealed a distinct particle size distribution with a mode particle diameter of 6.8 m. This particle size distribution appeared to be independent of shield gas composition, and the particle number concentration was significantly smaller than the sub-micrometer aerosols formed during the GMAW process (i.e., two-orders of magnitude smaller when weighted by particle mass).
Keywords
Aerosol-particles; Arc-welding; Gas-welders; Welding-equipment; Metallic-compounds; Metallic-ions
Contact
National Institute for Occupational Safety and Health, Division of Applied Research and Technology, 4676 Columbia Parkway, Cincinnati, OH 45226, USA
CODEN
JALSB7
Publication Date
20020401
Document Type
Journal Article
Email Address
jps3@cdc.gov
Fiscal Year
2002
NTIS Accession No.
NTIS Price
Issue of Publication
3
ISSN
0021-8502
NIOSH Division
DART
Priority Area
Control Technology & Personal Protective Equipment; Research Tools and Approaches
Source Name
Journal of Aerosol Science
State
OH; MO
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