[Jewelry making - Article 00705] - Re: [Orchid] Welding glasses with oxy/acetylene?

[James Binnion]

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>     I do not know anyone who uses dark glasses when soldering with oxy
>     and propane. When using oxy acetylene, the flame is bright enough
>     to leave serious spots in your (my) vision even if not looking
>     directly at it. This is just not the case with propane, for
>     whatever reason. 

    American Welding Society and OSHA both require shade 3-5 for brazing
    (our soldering) there is no differentiation for fuel type as they
    all emit light that can damage your eyes when brazing. 

    Three sources for eye strain/damage from light radiated by torches,
    the work and the brazing surface. 

    Infra Red, ie heat probably the biggest danger in brazing cooks the
    eye. 

    Visible light, more a cause of eye strain than damage at lower
    levels but can damage if bright enough with long enough exposure
    think platinum soldering. 

    UV, not a big amount of UV from brazing operations and most plastic
    lenses (safety glasses) are pretty good at stopping it. 

    Aur92 and Didymium lenses are glass lenses that are visible light
    filters, they don't much of anything about UV or Infra Red. They are
    specifically designed to knock down the yellow sodium flare in hot
    glass working and do a good job on the yellow flare from flux and
    fire bricks. 

    If you solder all day every day you need to wear some form of shaded
    lens (not didymium or Aur92) to knock down the infra red.If you are
    soldering platinum then you need to where at least a shade 5. 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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