Auto darkening welding helmet is designed toprotect the eyes and faces of Welders from spark, spatter and harmful infrared light, ultra-violetlight radiation under normal welding conditions.In addition to protecting to the eyes, the helmetprotects the face from hot metal sparks generatedby the arc and from UV (Ultra-Violet) & IRInfra-Red damage.Auto-darkening filter fitted in it automaticallychanges from light state to dark state when thewelding arc is struck and returns to the light statewhen welding is stopped.Correct shade number needs to be selected as perthe welding application process.The shade number can be set manually betweenDIN9-DIN13 by referring to the shade guidetable to determine the proper shade number forapplication. Shade number can be selected by turning the knob. The shade goes darkerfrom 9 to 13 gradually by turning knob.Before welding, the sensitivity shall be correctly set by turning knob to the critical pointbetween bright and dark.This helmet is most commonly used with arc welding processes such as shielded metalarc welding, gas tungsten arc welding and gas metal arc welding.Auto-darkening Welding helmets can also prevent retina burns, which can lead to a lossof vision. It is caused by unprotected exposure to the highly-concentrated ultraviolet andinfrared rays emitted by the welding arc. Ultraviolet emissions from the welding arc canalso damage uncovered skin, causing a sunburn-like condition in a relatively short periodof welding.The Ultra-Violet Infra-Red protection level is up to Shade DIN16 at all the times; itmakes welders feel comfortable during welding process.