Let's say that I am using an autodarkening helmet such as my harbor
freight helmet. Let's say that, for some reason, it fails to darken
when I start the arc. What are the consequences? Would I go blind or
have a temporary injury?
"Emmo" wrote in
You would not get any UV if thats your concern.
The helmet would malfunction if the sensors gets blocked by something, so I
assume it happens now and then.
The automatic shutter is to control the brightness, not the UV. Much of
the UV screening is from the glass itself and that's permanent.
If you break it, it will usually fail dark. The "light" filter is also
some protection itself. A quick glimpse of the arc is still less trouble
than a bare sight of the arc and we all get those often enough without
too much hazard.
If you drop it, the auto filters are mechanically a bit stronger than
the plain glass ones. I've broken old plain ones before, but still
haven't smashed the front of an auto.
No worse that the few times you forget to drop the lid and think "Gee that
was painfully stupid of me" Prepare for 48 hrs of scratchy, itchy burning
eyes and Visene does not really help... Been there, done it, got the pin.
Fraser Competition Engines
Long Beach, CA.
I am by no means an expert but the way I understand it any autodarkening
lens which meets the ANSI Z87.1-1989 standard (and most if not all of them
do) is the equivalent to a #14 filter for UV and Infrared even when it is
off so you get dazzled but nothing more.
BTW, my son has managed to burn his eyes a couple of times and the doctor
assured us that there would be no permanent damage. It feels like you have
sand in your eyes because they are basically sunburned. They put in drops
that killed the pain instantly but only for a short time and they wouldn't
let him continue to use them. Instead they told him to take Motrin and it
helped enough for him to sleep that night. :-/
"I'm not grown up enough to be so old!"
Way back in trade school, one of the trainee mechanics got a flash, and
complained about sand-eyes. Instructer told him to put a couple of tea bags on
his eyelids when he went home.
Came in the next day, and claimed it didn't help a bit. Seems it was
necessary to tell him to use WET teabags.
When I was in auto mechanic trade school, the welding class was right
across the hall. This was mid 70s. Two guys are oxy welding steel in
booths beside each other. One of them popped and a spark set his
considerable afro on fire. He didn't know it and kept welding. His
buddy noticed and started hitting him over the head with his cap to
put it out. The guy whose head was on fire thought he wanted to fight
and was preparing to give him a good one. The friend said "Man, your
head is on fire!". He ran and stuck his head in the water fountain.
He came back and said "Thanks, man. That could have burnt my brains
Rod: No Sir.
This was discussed a year or two ago where Mike Graham, this NG's (teddy
informed us that they sell clear safety glasses that will block 100% of UV.
The different shades for arc welding are for comfort.
If you see spots, move up a shade, etc.
If you can't see very well, move down a shade, etc.
The intricacies of nature is man's cannon fodder.