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

Details

• Personal Author:
  Afshari A ; Antonini JM ; Chen BT ; Cumpston A ; Cumpston JL ; Frazer DG ; Friend S ; Jackson M ; Leonard HD ; McKinney W ; Meighan TG ; Schwegler-Berry D ; Zeidler-Erdely PC
• Description:
  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 multimodal. 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. [Description provided by NIOSH]
• Subjects:
  Adhesives Aerosols Air Pollutants, Occupational Environmental Monitoring Inhalation Exposure Laboratories Metals Occupational Health Particulate Matter Respiratory System Safety Welding

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• Keywords:
  Aerosol-generators Aerosol-particles Author Keywords: Aerosol Generators Exposure-assessment Exposure-chambers Fumes Gases Inhalants Inhalation Inhalation-studies Laboratory-testing Metal-compounds Metal-fumes Organic-compounds Particulates Resistance Spot Welding Testing-equipment Volatiles Welders

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• ISSN:
  0895-8378
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  26
• Issue:
  12
• NIOSHTIC Number:
  nn:20045174
• Citation:
  Inhal Toxicol 2014 Oct; 26(12):708-719
• Contact Point Address:
  James M. Antonini, Ph.D., Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Mailstop 2015, Morgantown, WV 26505, USA
• Email:
  jga6@cdc.gov
• Federal Fiscal Year:
  2015
• NORA Priority Area:
  Construction
• Peer Reviewed:
  True
• Source Full Name:
  Inhalation Toxicology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:e402a934a08e66c8e9ea58cfcdec00d477d172add3794af87075050ef4c55066793186491476fdc00eaecacb6690612a2c0c708bd4a9b0ae5cb4f6fb0e127988
• Download URL:
  https://stacks.cdc.gov/view/cdc/200689/cdc_200689_DS1.pdf
• File Type:
  [PDF - 3.15 MB ]