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Arc Flash & Distance Question

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  • Arc Flash & Distance Question

    At my day job, the welding guys do a really good job of keeping their arcs behind curtins, but every once and a while, from a distance you can see an arc flash and your eyes try to look in that direction - which of course I don't.

    My question is - is there some kind of formula that causes the damage from looking at an arc to dimish over some distance. For example, if I weld something in my back yard and the old lady next door - some distance away, decides to watch (she watches everything!), are her eyes going to be damaged? When welding out in the back yard, how do you keep from causing eye damage to the neighbors?

    Thanks!
    Bill
    Miller Dialarc HF

  • #2
    as far as i know welding arc dosen't get any dimmer with distance, in our 100' shop someone can strike an arc on the opposite end and it's still very bright. i don't know of any magic distance where it won't harm your eyesight and unless your neighbors are a mile away they are within range. if you are worried about it you can get the welding flash hiders at any LWS and build a cheap frame to stay in good with the neighbors.......or if they want to watch that bad pick them up a hood! lol
    The one that dies with the most tools wins

    If it's worth having, it's worth working for

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    • #3
      A minimum of 30 meters at 100amps (about 100').
      hre

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      • #4
        i dont know the formula, but it would have to lessen in afect with distance. kind of like getting a sun burn in arizona V/S New york. you will still get the sun burn in New York it just takes longer. humm unless you are from arizona in New York in witch case you will likely tan. but i degress, the light is going to diminish intensity with distance lessening it's ability to burn the eys. your naibor is not likely to get a burn from a quick flash but will no dought go to bed seeing spots if she watches you weld all day.probly best to warn her against it.
        thanks for the help
        ......or..........
        hope i helped
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        feel free to shoot me an e-mail direct i have time to chat. [email protected]
        summer is here, plant a tree. if you don't have space or time to plant one sponsor some one else to plant one for you. a tree is an investment in our planet, help it out.
        JAMES

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        • #5
          Once again:

          Originally posted by Coalsmoke
          A minimum of 30 meters at 100amps (about 100').
          hre

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          • #6
            In an old 1945 welding book i have say's 35 feet. That seems too close to me though to be looking at stick welding.

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            • #7
              Bill,

              Radiation from a point source is subject to the inverse square law. At twice the distance you get 1/4 the radiation per unit area. At three times the distance you get 1/9 of the radiation per unit area. etc. etc.

              Regards,
              Bill
              "The more I learn about welding the more I find there is to learn..."

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              • #8
                Originally posted by BillC
                Bill,

                Radiation from a point source is subject to the inverse square law. At twice the distance you get 1/4 the radiation per unit area. At three times the distance you get 1/9 of the radiation per unit area. etc. etc.

                Regards,
                Thank you for someone else knowing this. If it were not for the above law the night sky would be solid white with stars, It clearly is not.

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                • #9
                  Originally posted by lowlypawn
                  Thank you for someone else knowing this. If it were not for the above law the night sky would be solid white with stars, It clearly is not.
                  yup, that's a great way of explaining it, I'll keep that one in my grab bag for future use
                  hre

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