Instant dimming for the welder. Free Technical Library News

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Instant dimming for the welder

03.12.2008

The welding helmet of the American company "3M" does not have to be raised and lowered during operation. Its glass, when the arc is turned on, automatically darkens in 0,1 milliseconds and brightens as soon as the arc goes out.

This is how the polarizing filter on liquid crystals works, which works when it is energized by the microprocessor that controls the mask. Moreover, the system reacts only to pulsating light (and the arc always pulsates during welding), so that it will not be confused by a randomly flashed sunbeam or a beam of a strong lantern. Welding ends - the light filter is clarified, and the welder, without lifting the shield, can again perform preparatory operations.

You can adjust the filter for enlightenment with some delay so that the welder is not blinded by the hot weld.

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