The very worst burn I had while welding was not from welding itself, but from the Sun reflecting behind me through my rig to my eyes. That is when they came out with the Gold colored lenses, and I thought they were Great, and I still use them today, but not outside.
Talk about the most intense pain I have ever experienced in my life! I was rolling on the floor for a couple days in sheer pain and misery! It hurt, really, really, bad!
Burning an arm or leg or other parts, is absolutely, without a doubt, not even comparable with burning your Eyes!
That stuff really hurts!
Be safe
