EFFICIENCY OF A FIBROUS ACTIVE CARBON FILTER AGAINST NOXIOUS WELD GASES

Ozone, a noxious gas produced in certain welding operations, causes acute respiratory disorders. To prevent this, the authors developed a fibrous active carbon filter, which is used together with a resin felt filter in the mask which will provide protection against metal fumes. Though this active carbon filter is only 5 mm in thickness and 2 g in weight, it is highly efficient in removing ozone. Tests show that 10 ppm of ozone at a flow rate of 301/min is largely absorbed so that the concentration after filtration becomes negligible. Furthermore the filter is usable for more than 200 hours of effective exposure time in MIG welding. The deposit of metal oxides in the weld fume on the surface of the active carbon filter may enhance its catalytic action in decomposing ozone. As the efficiency of removal of nitrogen oxides is decreased by high concentrations of these gases, the use of the FAC filter should be restricted to occasions when only a small capacity of absorption is required. It may be necessary to use other chemically active filters for nitrogen oxides.

  • Availability:
  • Corporate Authors:

    International Institute of Welding

    ,    
  • Authors:
    • Araki, Y
    • Honma, K
    • Sano, H
    • Yagami, T
    • Yagamuchi, H
  • Publication Date: 1980

Media Info

  • Pagination: p. 229-234
  • Serial:
    • Welding in the World
    • Volume: 18
    • Publisher: International Institute of Welding
    • ISSN: IX788-72/X-659-72

Subject/Index Terms

Filing Info

  • Accession Number: 00331951
  • Record Type: Publication
  • Report/Paper Numbers: No. 11/12
  • Files: TRIS
  • Created Date: Jun 12 1981 12:00AM