Thinking About a Welding Helmet

Discussion in 'Hangar Talk' started by Ted DuPuis, Jan 31, 2019.

  1. asechrest

    asechrest En-Route

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    PS - I've read that true arc flash shouldn't happen even if the auto-darkening is broken because of the passive IR/UV filtering of the lense. As a guy who knows jack about welding, not sure whether to believe that.
     
  2. -KLB-

    -KLB- Pre-takeoff checklist

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    The visible light that is left can still do damage. But it is also the 1% of the spectrum that causes pain before the damage. All the UV and IR that is 99% of the damaging energy, your eyes won't register as pain until well after the damage is done.

    Lasers are specifically rated as more dangerous if they fall outside the visible range, because you have no automatic blink response to the overload and damage. The same applies to an extent here.

    When welding, the most likely reason to have a failure to darken is for all the light sensors to have not had clear line of sight to the arc. This is usually more common on helmets with only 2 sensors, both above the lens. You can usually identify the sensors as 1/8 inch square or round objects inset that sort of look like a dark red or violet LED that never illuminates.