Metal arc welding hazard reduction by selection of the best combination of shield gas and metal transfer mode.
Keane-M; Chen-B; Stone-S
NORA Symposium 2011: Achieving Impact Through Research and Partnerships, July 12-13, 2011, Cincinnati, Ohio. Cincinnati, OH: National Institute for Occupational Safety and Health, 2011 Jul; :35
The primary goal of the proposed project is to identify and develop ways in which the best current common gas metal arc welding practices may be selected to reduce worker exposure to welding fumes. The understanding of how process conditions influence fume profiles can significantly contribute to creating strategies for minimizing fume exposures and selecting engineering controls to avert adverse health effects. A welding chamber was designed and fabricated based on an American Welding Society chamber, and was adapted for use with a 102 mm filter holder and external monitors for ozone and total particulate matter. The welding piece is rotated with a motorized turntable, and flow was upward through a 102 mm electrets filter at 200 liters/min. The system was validated in the AWS specification test using mild steel axial spray mode with 100 percent CO2. Monitoring with both the DataRAM for TSP and a UV-ozone monitor, ozone was cleared in less than 2 minutes from the chamber, and TPM generally within 3 minutes after the arc time was completed.
Welding; Arc-welding; Gas-welders; Work-practices; Welders; Fumes; Employee-exposure; Exposure-levels; Metal-fumes; Metal-workers; Metals; Exposure-assessment; Exposure-chambers; Exposure-methods; Particulates; Monitoring-systems; Engineering-controls; Filters; Monitors
NORA Symposium 2011: Achieving Impact Through Research and Partnerships, July 12-13, 2011, Cincinnati, Ohio