[Jewelry making - Article 00528] - Re: [Orchid] Welding glasses with oxy/acetylene?

[Peter W . Rowe]

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>     Am I right in my understanding that it is necessary to wear shade
>     5 welding-type eye protection any time you are using acetylene with
>     oxygen (not room air), such as a Little torch? 

    If you're using a regular sized welding torch, you'd want that
    filter just so you can see what you're doing. With a little torch,
    the flame is so tiny that you need not worry about it as needed
    protection. If you find things too bright too see what's happening,
    then use some sort of filter so you can see. Oxy acetylene flames can
    be hot enough, especially if you're using it as a neutral or even
    oxidizing flame, such as might be the case with platinum, that they
    can begine to give some ultraviolet, but these low levels would be
    blocked by any glass lens, shaded or not. Any modest sunglass lens
    that offers UV protection would do it too. A larger flame may also
    send out enough radiant heat (infrared) that you'd want some sort of
    protection (is the flame hot enough, and your face close enough, that
    you feel the heat? if so, wear something) that you'd want protection.
    But again, for the sizes you're talking about with the little torch,
    it doesn't take much. A shade five is fine if you're torch welding
    steel or doing something else equally high temperature. if you're
    soldering gold or silver, though, with a shade five you won't be able
    to see what you're doing, which would be a pretty good sign that
    you've got too much filter... 

    by the way, it was fun seeing you at SNAG. 

Cheers
Peter
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