https://onwar.se/ 2026-09-27T12:27:44+00:00 https://onwar.se/ https://onwar.se/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2026-09-27T10:06:18+00:00 Anonymous (anonymous@undisclosed.example.com) https://onwar.se/doku.php?id=choosing_a_welding_helmet:auto-darkening_lenses_explained&rev=1790503578&do=diff An auto-darkening welding helmet uses a liquid crystal filter that switches automatically from a light state to a dark shade the instant it detects an arc, then reverts once the arc is gone. This replaces the older habit of flipping a fixed-shade visor down and up by hand, which meant either welding blind for a split second or lifting the helmet to check your position before striking the arc. 3M Speedglas is one of the ranges we point people towards most often for this, alongside other options a…