Arc welders should be using a lens shade between 10 to 14. The
sunglasses are probably a 3 shade. The shades don't block radiation
the same across the spectrum (see chart).
He's probably getting 1000x more radiation from far UV than he should
and 20x more IR radiation than he should (comparing the transmittance
of shades 3 vs 10) ALL the excess radiation (over what is
recommended) is bad. Excessive IR alone can cause premature
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.