Does Edge Darkening Mean a Faulty Auto Arc Welding Hood
A welder lowers the hood, strikes an arc, and notices the centre of the view going dark while the corners remain paler. The first reaction is often suspicion that the cartridge has failed, yet in most cases nothing is wrong at all. Owners of any auto arc welding hood meet this observation sooner or later, and welding-helmet technicians treat it as one of the most routine questions they...
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